Tabata training: one of the most energetically effective high-intensity intermittent training methods
The Journal of Physiological Sciences volume 69, pages 559–572 (2019)
For decades, high-intensity interval/intermittent exercise training methods have been used by elite athletes to improve their performance in sports. One of the most effective training methods, i.e., ‘Tabata training,’ is reviewed herein from the viewpoint of the energetics of exercise. The prior research describing the metabolic profile and effects of Tabata training is also summarized, with some historical anecdotes.
Interval training has been used for decades by elite athletes seeking to improve their sports performance . The interval training method known as Fartlek training was invented by the Swedish coach Gösta Holmér in the 1930s . Dr. Woldemar Gershler also formalized a structured system of interval training in Germany in the 1930s . Interval training was popularized by the Czech runner Emil Zátopek, who won gold medals in the 5000- and 10,000-m races as well as the marathon at the Helsinki Olympic games in 1952 .
Thus, interval training itself is not new, and it was extensively investigated during the 1970s. The effects of high-intensity interval training on the human body’s aerobic energy-releasing system were thoroughly examined by Edward Fox [1, 5]. He showed that the improvement of the body’s maximal oxygen uptake (VO2max) after high-intensity interval training is linearly related to the oxygen demand (expressed as % VO2max) of the high-intensity interval training, indicating that exercise intensity is a key factor for the improvement of the body’s maximal aerobic power after high-intensity interval training [5–7]. Further, Fox showed that the improvement of the VO2max after high-intensity interval training performed 2 days/week is not different from that achieved by training with this regimen 4 days/week [5, 7]. Since 3 days/week is the recommended frequency of training to improve the VO2max by conventional moderate-intensity exercise training, it is apparent that high-intensity interval training is a potent stimulus for improving one’s maximal aerobic power . Thus, high-intensity exercises and training have been used by elite athletes to improve their performance in sports, as such high-intensity exercise was shown to extensively recruit the aerobic energy-supplying system, resulting in the increased maximal oxygen uptake that is the most reliable factor for endurance.
New and important information about high-intensity interval training became available in 1980—i.e., the anaerobic profile of high-intensity interval training. There had been a lack of quantification of anaerobic energy during high-intensity exercise before the 1980s, when the late Lars Hermansen proposed a method [9, 10] for quantifying the anaerobic energy release that uses the accumulated oxygen deficit, which was first introduced by Krogh and Lindhard in 1920 . The anaerobic energy release [which is another aspect of the energy supply for resynthesizing the adenosine triphosphate (ATP) consumed during exercise, especially maximal- to supramaximal-intensity exercises] had not been quantified. ‘Accumulated oxygen deficit’ is defined as the difference between the accumulated oxygen demand and the accumulated oxygen uptake measured during exercise. This principle was further used to estimate the accumulated oxygen deficit during a high-intensity intermittent exercise  by the first author of the original 1996 paper describing Tabata training  (Izumi Tabata), who had studied at the Institute of Muscle Physiology in Oslo, Norway under the supervision of Dr. Hermansen and learned the principle directly from him.
Before this review is considered, the nomenclature regarding Tabata training and high-intensity interval/intermittent training should be established. Tabata training is defined as training at the intensity that exhausts subjects during the 7th or 8th sets of 20-s bicycle exercise bouts with a 10-s rest between the exercise bouts. This exercise/training was originally developed for bicycling exercise [12, 13]. Regarding similar protocol training that uses other types of exercise including running and various body-weight-bearing exercises (e.g., burpees and squat jumps), the published evidence of their metabolic profiles and effects on both VO2max and the maximal accumulated oxygen deficit (MAOD) is insufficient. In this review, we therefore focus on Tabata training, defined as bicycle training at the intensity that exhausts subjects during seven or eight sets of 20-s bicycle exercise bouts with a 10-s rest between the bouts.
At more than 20 years after the publication of the original study [12, 13], the exercise intensity has not been emphasized; only the procedure of the training has been featured, especially among general exercisers. For example, following such a protocol (eight sets of a 20-s exercise with a 10-s rest between the exercise bouts) using walking as the exercise can be expected to result in no improvement of the VO2max. Only training adopting the protocol with an exercise intensity that exhausts the subject after 7–8 sets of the 20-s exercise bout with a 10-s rest between the exercise bouts (i.e., Tabata training) elevates both the VO2max and the MAOD to the extent that was reported by the original investigation.
Such increases in the two energy-releasing systems (i.e., the aerobic and anaerobic energy-releasing systems) cannot be obtained by walking, the exercise intensity of which is estimated as < 30% VO2, in Tabata protocol. Therefore, the term ‘Tabata training’ emphasizing not only the procedure but also the exercise intensity that exhausts the subject after 7–8 sets of the exercise should be used for the name of the training, and this term will be used hereafter in this review [12, 13].
Interval or intermittent?
In a popular method of interval training, an individual exercises at low intensity between bouts of high-intensity exercise . In contrast, intermittent training (including Tabata training [12, 13]), exercisers completely stop the exercise and rest for a while. Training that involves such a ‘complete stop’ period is thus called ‘intermittent’ training [14, 15]. Intermittent training and interval training thus differ significantly, and it is important to keep in mind that Tabata training is an intermittent-exercise training method.
HIIT, SIT, or?
Tabata training has been considered one of the high-intensity ‘interval or intermittent’ training (HIIT) methods, which have varied considerably in terms of the characteristics of the training exercise, i.e., the exercise mode, intensity, and durations of exercise and rest. Weston et al. defined HIIT as ‘near maximal’ (in other words, ‘submaximal’) effort generally performed at an intensity that elicits > 80% (often 85–95%) of the maximal heart rate . Thompson suggested a broader definition of HIIT in which HIIT typically involves short bursts of high-intensity exercise followed by a short period of rest or recovery and typically takes < 30 min to perform .
In contrast, sprint interval training (SIT) is characterized by efforts performed at intensities equal to or greater than the pace that would elicit a VO2peak, including ‘all-out’ or ‘supramaximal’ efforts . The word ‘sprint’ implies moving as fast as possible from the start of an exercise , with an eventual decline in speed and/or a discontinuation of the exercise. In contrast, in the original and authentic Tabata training protocol, the exercise intensity is constant (i.e., 170% VO2max) from the first to the last session of the exercise. Using the word ‘sprint’ to describe Tabata training exercise is therefore not accurate.
In exercise physiology, the intensity of a specific exercise has been defined relative to the VO2max as ‘submaximal,’ ‘maximal,’ and ‘supramaximal’ when the oxygen demand is less than, equal to, and greater than the VO2max, respectively. Since the oxygen demand for Tabata training is higher than the VO2max (i.e., 170% VO2max), the original Tabata training is ‘supramaximal intensity intermittent training.’ In terms of the exercise:recovery ratio, Tabata training is different from other SITs, as Sloth et al.  defined SIT as a protocol that includes duration of bouts: 10–60 s, intensity: maximal, “all-out”, volume: ≥ 12 repetitions, recovery: ≥ 5 times the duration of work, and Gist et al.  defined it as intensity: “all-out”, “supramaximal”, “maximal” or “ ≥ VO2max”, SIT work:rest ratio of 30-s:4-min (rest interval of 3–5 min). Tabata training is thus not SIT in terms of the classical terminology of SIT. Tabata training is an original and unique training method that can be described by either the classic but familiar term ‘interval training’ or the modern and “cool” term ‘HIIT,’ which includes a variety of training methods using intermittent/interval high-intensity exercise.
The metabolic profile of Tabata training exercise
The endurance profile of most exercises and sports is thought to depend on the amount of energy output per unit of time. Since the energy output (i.e., the ATP consumption/resynthesis) is equal to the energy supply from the body’s aerobic and anaerobic energy-supplying systems, it well recognized that increasing the functioning of the two energy-supplying systems by physical training is an optimal way to enhance endurance performance [21, 22]. Endurance training elevates the maximal aerobic power [23–25], whereas sprint training using very brief exercise at high intensity increases the body’s anaerobic capacity measured as the MAOD . For most physical properties, the more demanding the training is, the greater the improvement of the property will be, and it is thus necessary to measure the energy supply from both the aerobic and anaerobic energy-supplying systems during exercise in order to evaluate the training’s efficacy. The aerobic-energy release is well quantified by measuring the VO2. Therefore, by measuring the oxygen uptake and comparing that value with the subject’s VO2max, the demand of the exercise/training on the aerobic energy-releasing system can be evaluated.
Since, at a submaximal exercise intensity, the energy from the anaerobic energy-releasing system is supplied only at the beginning of the exercise, the relative contribution of this system is low . In contrast, the anaerobic energy-releasing system contributes significantly to the total energy demand by 35, 53, and 70% during exhaustive exercises at the supramaximal intensity of 119, 146, and 186% VO2max, respectively . As evaluating stress of a specific exercise on aerobic energy-releasing system as a training, stress on the anaerobic energy-releasing system can be evaluated by comparing the accumulated oxygen deficit during an exercise to the anaerobic capacity (i.e., the MAOD). However, high-intensity intermittent exercise, which is often used as a training method, had not been evaluated using the same methods until we assessed the energy release from both the aerobic and anaerobic energy-releasing systems during two different intermittent exercise protocols , which are used by some of the top Japanese speed skaters. We analyzed the two training protocols for the following reasons.
The two training protocols were introduced by Kouichi Irisawa, who was a head coach of the Japanese Speed Skating Team in the 1980s. Mr. Irisawa (who was sent by the Japan Sport Association as a visiting guest to the Norwegian Skate Federation) and the first author (I. Tabata) of the original investigation of Tabata training [12, 13] stayed in the same dormitory at the University of Oslo for most of 1984. After returning to Japan, Tabata joined the Japan National Speed Skating Team led by Mr. Irisawa as the fitness coach for the Albertville Olympics to be held in 1992. After discussion during the National team’s training camp in 1989 in Maebashi in Japan’s Gunma Prefecture about the selection of the best training method, the two training methods developed by Mr. Irisawa and used by top Japanese skaters were compared in a study  conducted at a laboratory at the National Institute of Fitness and Sport in Kanoya, which is located in the southernmost region of Japan.
The study compared two intermittent bicycle exercise (IE) protocols (IE1 and IE2) . The results of that investigation showed that the accumulated oxygen deficit during the exhaustive intermittent exercise of IE1 (exercise intensity: approx. 170% VO2max, 7–8 bouts of 20-s exercise with a 10-s rest between bouts) equaled the anaerobic capacity (i.e., MAOD), and thus the IE1 protocol seemed to stress the anaerobic energy system maximally (Fig. 1). In addition, the IE1 protocol recruited the oxygen delivery system maximally since the oxygen uptake measured during the last part of the IE1 protocol was not different from the VO2max of the subjects (Fig. 2).
In contrast, neither the anaerobic system nor the aerobic system seemed to be fully stressed during the exhaustive intermittent exercise of the IE2 protocol (exercise intensity: approx. 200% VO2max, 3–4 bouts of 30-s exercise with a 2-min rest between bouts). These results demonstrated that, for the purpose of improving both the anaerobic and aerobic energy-releasing systems, the IE1 protocol was superior to the IE2 protocol. The IE1 protocol was also confirmed to stimulate both the aerobic and anaerobic energy-releasing systems maximally. Since the human body has only these two energy-supplying systems, the IE1 protocol can be regarded is one of the most energetically effective exercise training protocols for maximally improving both the aerobic and anaerobic energy-supplying systems.
As mentioned above, since the IE1 training protocol emerged during discussions between a top coach who had an instinct for develop new training methods based on interactions with athletes and an exercise physiologist who was good at scientifically analyzing the characteristics of exercise, Tabata training was both clinical (practical)- and bedside (rink-side or gym-side)-initiated training. After the above-described results were reported to Mr. Irisawa, he stopped using the IE2 protocol as part of the training menu for the skaters and concentrated on the use of the IE1 protocol (i.e., Tabata training).
For anaerobic energy quantification, especially during 0–10 min of exhaustive exercise of which the exercise intensity is above the VO2max, an estimation of the oxygen demand for such exercise is required. The oxygen demand is a value (L/min, or ml/kg/min) representing the oxygen that the body needs for a specific exercise at a specific intensity (Fig. 3). For a submaximal-intensity exercise, the oxygen demand for a specific exercise is measured as the oxygen uptake during the exercise. For a submaximal-intensity exercise, the oxygen demand of which the oxygen uptake has not been measured, the oxygen demand can be estimated quite accurately by interpolation from the linear relationship between the exercise intensity (W) [12, 13] (Fig. 3) and the measured oxygen uptake, in the same way as that used for running (m/min) .
This relationship was established by measuring the oxygen uptake at 6–9 different intensities of 10-min exercises. This time-consuming procedure, which need at least 3 days of testing, has been also used to measure the VO2max in Scandinavian countries. Without establishing a linear relationship (r > 0.99) between the oxygen uptake and the exercise intensity at a submaximal range, the leveling off of the oxygen uptake in response to increased exercise intensity, which is the only criterion for measuring the maximal oxygen uptake , cannot be confirmed. Without this leveling off, the measurement is regarded not as the VO2max but rather as the peakVO2. The measurement of the oxygen uptake at ten different intensities of 4-min exercises could be used to establish the relationship between the oxygen uptake and work rate at a submaximal level . Since the work rate during swimming is theoretically related to [swimming speed (m/s)3], a linear relationship between exercise intensity and oxygen uptake is established by the relationship between the exercise intensity [swimming speed (m/s)3] and the oxygen uptake .
In contract to submaximal-intensity exercise, the oxygen uptake of a supramaximal-intensity exercise cannot be measured; if the oxygen uptake at such high intensity is higher than the VO2max, it is the VO2max of the subject. Therefore, in terms of expressing the intensity of a supramaximal-intensity exercise relative to the VO2max, similar to the exercise intensity of 170% VO2max for the IE1 protocol (Tabata training) , the oxygen demand (not the oxygen uptake) is used, and the oxygen demand is estimated by extrapolating the linear relationship between exercise intensities at submaximal levels and the measured oxygen uptake (Fig. 3). For example, the oxygen demand of 170% VO2max for bicycling is calculated as 1.70 times the VO2max measured for bicycling.
It should be noted that, for estimating oxygen demand at supramaximal intensity, the relationship between exercise intensity (the work rate) and the submaximal level oxygen uptake measured by an incremental test [e.g., a graded exertion test (GXT)]  should not be used. The oxygen uptake at a specific exercise intensity measured by an incremental test procedure, which normally allots an identical time (1–2 min) for each exercise intensity, does not necessarily represents the oxygen uptake or oxygen demand, which is balanced with energy for re-synthesizing the ATP consumed during exercise at the specific intensity. This is because the time necessary for the oxygen uptake to reach the steady state (which is defined as the oxygen uptake/demand balance of the specific exercise) differs based on the exercise intensity. The time necessary for the oxygen uptake to reach the steady state of oxygen consumption at a higher exercise intensity is longer than that at a lower exercise intensity . Therefore, the original investigation of anaerobic capacity (MAOD) measured oxygen uptake during 6–9 bouts of 10-min constant-intensity exercises whose intensity ranges from approx. 30% to 85% of the VO2max .
The original investigation [10, 12, 13] used such a time-consuming test for the following reasons: (1) to measure the VO2max correctly by ascertaining the leveling-off, and (2) to correctly estimate the oxygen demand at supramaximal intensity for calculating the accumulated oxygen deficit, which is defined as the difference between the total accumulated oxygen demand (L), [i.e., the estimated oxygen demand (L/min) × the exercise time (min)] and the accumulated oxygen uptake (L) measured during the exercise.
The effects of Tabata training on the body’s aerobic and anaerobic energy-releasing systems
Six weeks of training using the IE1 protocol, which was later named Tabata training, was found to increase the MAOD by 28.0 ± 19.4% (Fig. 4) and the VO2max by 15.0 ± 4.7% (Fig. 5) . This training consisted of 4 days/week of exhaustive IE1 exercises (7–8 sets to exhaustion) and 1 day/week of 30 min of continuous exercise at 70% VO2max and four subsequent sets of the IE1 protocol, which was not exhaustive. The results of that study suggested that this high-intensity intermittent exercise is a very effective tool to improve sports-related physical fitness. Since this training improved the subjects’ VO2max and MAOD during the training period, the training subjects became able to bike > 8 sets of the 20-s exercise at the first-prescribed intensity for the training. At that time point, the intensity (i.e., the work rate for bicycling) was increased by 11 watts so that the exercise exhausted the subjects within 7–8 sets of 20-s exercise. The important thing is that, during this training period, the exercise intensity that exhausts the subject within 7–8 sets of the 20-s exercise should be prescribed during the entire training period.
It is well known that there is a site specificity of training and its effects. As an example of site specificity, only the functioning of the lower-leg muscles is improved by exercise using the lower legs, e.g., squats. No effects are expected to be found in the functioning of the arm muscles. There is also specificity regarding energy-releasing systems. Anaerobic training improves the body’s anaerobic capacity measured as the MAOD, whereas aerobic training elevates the aerobic capacity measured as the VO2max. For example, Medbø and Burgers  reported that training with eight bouts of 20-s running exercise at 165% VO2max with a 4.5–5.0-min pause between the bouts increased the subjects’ MAOD by approx. 10%.
Aerobic training consisting of 1-h prolonged bicycle exercise at 70% VO2max increased the VO2max without effects on the MAOD . During the last session of the IE1 protocol, the oxygen uptake reached the VO2max (which is a measure of aerobic capacity), and the accumulated oxygen deficit of the training exercise amounted to the MAOD (which is a measure of anaerobic capacity). The magnitude of the effects of specific training on a specific aspect of fitness may depend on the extent to which the training stresses the subject’s fitness. Since humans have only two energy-releasing systems and the IE1 protocol stresses both systems maximally, training using the IE1 protocol can be regarded as one of the ultimate aerobic and anaerobic training methods. Consequently, according to the system specificity of training and its effects on energy release, Tabata training enhances both the VO2max and the MAOD.
Since the intensity of the IE1 protocol is quite high compared to other types of so-called ‘aerobic exercise,’ training using the IE1 protocol looks like ‘anaerobic training.’ If this is so, and if the effect is expected according to the specificity of energy release, training that uses the IE1 protocol is not expected to improve the VO2max. However, the oxygen uptake at the end of training using the IE1 protocol reaches the VO2max. This result, i.e., that the VO2max was increased by the training, can be explained by the specificity of training and training effects regarding energy release. One may think it strange that the study’s authors  measured oxygen uptake during the IE1 that appears to be anaerobic exercise. This was simply because, for the calculation of the oxygen deficit value needed for the determination of the anaerobic energy release of the training, the oxygen uptake had to be measured.
After the publication of these two papers [12, 13], training using the IE1 protocol began to be referred to as the ‘Tabata protocol,’ ‘Tabata interval training,’ or ‘Tabata-style training,’ and these terms began to be used by many people, including both sport-oriented athletes and health-oriented non-athletes. Further research on ‘Tabata’ or ‘Tabata-style’ exercise training was then conducted. For example, Foster et al. elegantly reproduced the effect of 8 weeks of Tabata training on aerobic energy-releasing system (18% increase in the VO2max) .
As shown by Foster et al. , the Tabata training method is quite demanding for ordinary young adults. The use of this training method needs (1) high motivation of elite athletes who want to elevate both their aerobic and anaerobic energy-releasing systems, and (2) convincing instruction to the athletes from coaches who fully understand the scientific evidence regarding this method.
Different high-intensity intermittent exercise protocols
In their efforts to devise a more efficient training method than Tabata training, Kouzaki and Tabata compared several other high-intensity intermittent bicycle exercise protocols in terms of the recruitment of the aerobic and anaerobic energy-releasing systems . Their study revealed that the most demanding protocol was the ‘IDE200’ protocol, which used the intensity 200% VO2max for the first and second sets, 180% VO2max for the third and fourth sets, and 160% VO2max for the fifth and sixth sets of 20-s exercise bouts separated by 10-s rests. This was because the oxygen deficit during the IDE200 protocol and the oxygen uptake during the last part of the protocol were not significantly different from those observed during the IE170 protocol (i.e., Tabata training).
In addition, the peak lactate concentration after the IDE200 protocol was significantly higher than that observed after the IE170 protocol. The reasons for the comparison of the IDE200 protocol with Tabata training (IE170) were as follows. Even during such high-intensity exercise, which appears to be ‘anaerobic’ exercise, the oxygen uptake during the first 20 s is related to the oxygen demand of the exercise, which is expressed as the %VO2max (Kouzaki and Tabata, unpublished observation), and the higher the speed of the recruitment of aerobic energy during the beginning of the high-intensity exercise, the higher the oxygen uptake was during the last phase of the exercise.
Secondly, the oxygen deficit that accumulated during the 30-s exhaustive exercise (200% VO2max) does not reach the maximal oxygen deficit [7, 18], suggesting that such high-intensity exercise to exhaustion does not recruit anaerobic energy maximally. To ensure a full recruitment of anaerobic energy release, a somewhat low intensity is required. Therefore, the exercise intensity used for the last two bouts was 160% VO2max, which corresponds to the intensity that exhausts the subjects at approx. 1–2 min and which was shown to maximally stimulate the anaerobic energy-releasing system.
After an 8-week training using the IDE200 protocol 5 days/week, the subjects’ MAOD was increased significantly (by 32%), and the VO2max was also elevated significantly (by 14%) .
Ogita et al. reported that a higher-intensity (approx. 250% VO2max) and shorter-duration (five 5-s exercise bouts with a 10-s rest between bouts) intermittent swimming training protocol performed for 4 weeks improved the swimmers’ MAOD and VO2max by 22% and 5%, respectively .
The effects of Tabata training and resistance training on the MAOD
Principally, the MAOD is proportional to the muscle volume. This is because the greater the muscle volume, the more creatine phosphate is available in whole muscle and the more lactate accumulates; creatine phosphate and lactate are the bases of the alactic and lactic energy release that respectively comprise anaerobic energy release. Changes in the MAOD after resistance training that enlarges muscle volume were thus investigated by Hirai and Tabata . In that study, the training consisted of a high-intensity intermittent exercise training (IT; in this case, Tabata training) for 6 weeks and IT plus resistance training (RT) for the subsequent 6 weeks. During the IT-alone period, the subjects trained using IT on 5 days/week. During the IT + RT period, they trained using IT on 3 days/week and RT for 3 days/week. The IT increased the subjects’ MAOD by 17% (Fig. 6). The RT consisted of (a): four sets of 12 repetitions of squat and leg curl exercises at 12 repetition max (RM) with a 30-s rest between each set, and (b) two sets of maximal bouts of the same exercise with a load of 90, 80, and 70% of one RM.
After the IT and RT period, the subject lifted a barbell mass 12 times (12 RM) for squat was increased by 108 ± 8%. The IT + RT further increased the subjects’ MAOD values, suggesting that an increase in muscle volume as a result of resistance training is effective for increasing the MAOD . However, Minahan and Wood reported that resistance training did not affect the MAOD . It is thus not known whether the increase in the MAOD obtained with an IT + RT regimen is attributable to combined effects of resistance training and HIIT or just to HIIT. Further research can be expected to elucidate this issue.
During the IT-alone period, both the maximal power during the Wingate test, and the circumference (cm) of thigh muscle were not changed. However, after the IT and RT period, the maximal power was significantly increased by 10 ± 3% (p < 0.05) with a significant increase in the thigh muscle circumference (3 ± 1%, p < 0.01) . These results may indicate that (1) Tabata training itself does not affect anaerobic power, and (2) an increase in muscle mass is necessary to induce an increase in anaerobic power.
In the above-described study by Hirai and Tabata , the VO2max increased during the IT period (11 ± 2%), whereas no significant change was observed during the IT + RT period (Fig. 7). This result may indicate that, in terms of high-intensity intermittent training, a different strategy is necessary for further improvement in the aerobic energy-releasing system. Hickson et al. demonstrated that simultaneous training for strength and endurance will result in a reduced capacity to develop strength, but will not affect the magnitude of the increase in the VO2max . Studies that eliminate the interference of one type of fitness over another type should be devised to address this issue.
Metabolic changes in muscle after Tabata training
Changes in the enzyme activity/content in skeletal muscles recruited during exercise training were studied after Bergstrom introduced the needle biopsy technique in 1962 . Specific training induces increased expressions of proteins that have specific physiological functions in skeletal muscles recruited by training. For example, aerobic training increases the enzyme activities of citrate synthase (CS, which is a key enzyme for oxidative metabolism ), and high-intensity exercise training increases glycogen phosphorylase and phosphofructokinase (PFK), which are possible rate-limiting enzymes of anaerobic metabolism [41, 42]. Sprint training with a very short duration of exercise (i.e., 5-s running) without changes in the VO2max elevated the enzyme activity of myokinase .
Skeletal muscle adaptation to Tabata training was recently reported . After 6 weeks of Tabata training, the enzyme activities of CS and PFK were significantly increased (Fig. 8), indicating that the training may have enhanced protein expressions, possibly limiting both the aerobic and anaerobic energy-releasing systems, suggesting that in terms of the two energy-releasing systems, peripheral adaptations occurred after the Tabata training. These elevated enzyme activities may have contributed to the increases in the VO2max (9.2%) and MAOD (20.9%).
In addition, along with an enhanced expression of fatty acid oxidative enzyme activity , the protein expression of peroxisome proliferator-activated receptor-γ coactivator-1 α (PGC1α) was found to be enhanced after rats performed a Tabata training model . Those results suggested that dozens of proteins that are known to be increased by this transcriptional coactivator may be increased after Tabata training .
The swimming protocol used for the above-mentioned rat study consists of 14 bouts of intermittent 20-s swimming with a 10-s rest between the exercise bouts while the rat bears a weight equivalent to 14% of its body weight . Since it was not feasible for rats to run intermittently at a high intensity (speed) on a treadmill, swimming was introduced to model Tabata training for rats. Because the oxygen uptake during the high-intensity intermittent swimming was not measured in that investigation, the precise percentage of the rats’ maximal oxygen uptake during the swimming was not known. The reason that this protocol has been used in previous studies is that the protocol was shown, by trial and error, to raise the blood lactate concentration to levels that were similar to those measured for humans and to elevate the enzyme activity of citrate synthase, which is an oxidative enzyme in mitochondria .
Indeed, the above-cited clinical study  demonstrated that 79 genes including genes involved in glucose metabolism, the mitochondria membrane, the extracellular matrix, and angiogenesis were increased in skeletal muscle by training. A proteomics analysis of rat muscles after Tabata-model training revealed that the protein expression of glycogen phosphorylase (the first enzyme of glycogenolysis) was increased . It is well documented that low-volume interval training increases skeletal muscle oxidative enzymes . Robinson et al.  reported that moderate-intensity HIIT affects the transcription of a large number of proteins in humans.
In terms of the increase in the VO2max after HIIT, there has been some disagreement regarding whether the main location of the occurrence of adaptation is central (cardiorespiratory: cardiac output) or peripheral (skeletal muscle: metabolic enzymes). The improvement in the VO2max after specific training may be due to both central and peripheral factors, which correspond to increased cardiac output and oxygen extraction and/or oxygen consumption in working skeletal muscle. These factors can be further explained by increased maximal cardiac output/stroke volume of heart and increased oxidative enzyme activity in skeletal muscle, respectively. Since the increase in the VO2max after HIIT including Tabata training is very rapid (e.g., 2–3 weeks) [13, 36] and changes in the morphology of the heart are not expected during such a short time period, the increase in the VO2max after Tabata training could be attributed to peripheral factors.
However, Burgomaster et al.  reported that after 2 weeks of SIT training, the subjects’ VO2peak did not increase but the activity of CS was enhanced by 38%, suggesting that changes in peripheral factors do not necessarily induce increase in VO2peak. Daussin et al. suggested that adaptation after interval training occurs both centrally and peripherally . Macpherson et al. reported that 6-week run sprint interval training improved their subjects’ aerobic performance but not maximal cardiac output , whereas another research group reported that 6-week high-intensity interval training increased their subjects’ cardiac output and VO2max . The authors of the latter study attributed the initial increase in cardiac output after the early phase of the high-intensity interval training to plasma volume expansion , which was apt to occur in their sedentary subjects with lower VO2max values compared to those of the recreationally active subjects of the Macpherson et al. study. Further research is necessary to address these findings.
In the original Tabata et al. study in 1996 , the subjects executed Tabata training exercise for 4 days and non-exhaustive sessions of exercise at 170% VO2max after 30 min of exercise at 70% VO2max on Wednesday as a break. However, as Fox et al. reported, the frequency of 2 × /week appears to be enough for Tabata training to induce the adaptation of the aerobic energy-releasing system [5, 7]. In terms of peripheral adaptation, the expression of PGC1α, which is a potent transcriptional coactivator for enzymes involved in oxidative metabolism, was maintained for ≥ 24 h after Tabata training in rats . This transcriptional coactivator activates the transcription of proteins that have physiological functions, and its activity remained high for several days. When the human subjects exercised for 2 days, a high level of PGC1α was maintained for half a week. This might explain why only 2 days of Tabata training enhanced the subjects’ oxidative metabolism, in which dozens of enzyme proteins are involved in skeletal muscle.
In terms of the number of training sessions per day, the PGC1α expression after 5 days of Tabata training performed 1×/day or 2×/day was compared in rats, and no difference was observed between these training groups. Although this finding was not from a human study, the results of other experiments suggest that the PGCα expression is saturated after Tabata training in rats (Terada and Tabata, unpublished observation). A further expression of PGC1α and a subsequent increase in proteins that are transcriptionally stimulated by PGC1α should thus not be expected when a human does additional Tabata training on the same day.
Changes in muscle buffer capacity in muscle after Tabata training
One of the most important changes explaining the improvement of the MAOD after HIIT—probably including Tabata training—is the enhanced buffer capacity of muscles recruited during the HIIT . This enhanced capacity allows more muscle lactate formation, which results in proportional glycolytic ATP production for high-intensity exercises. Shark et al. reported that, after 8-week sprint training, their subjects’ muscle buffer capacity was increased by ~ 37%. This robust increase in buffering capacity may explain the majority of the elevation of the MAOD after HIIIT including Tabata training.
In addition, carnosine is regarded as a minor contributing factor (5–10%) to muscle buffer capacity . In this context, it is interesting that the levels of the mRNA and protein of carnosine synthase 1 were increased by Tabata training , suggesting that the body’s carnosine content might be elevated by Tabata training as demonstrated after a HIIT .
The effects of Tabata training on circulation
Endurance training increases capillary density . Cocks et al.  reported that SIT and endurance training are equally effective at increasing skeletal muscle capillarization and the body’s endothelial nitric oxide synthase (eNOS) content and at decreasing aortic stiffness. Using an animal model of Tabata training, Hasegawa et al.  observed that Tabata training decreased central arterial stiffness (assessed by arterial pulse wave velocity) to the same level as conventional aerobic training through the same arterial signal mechanism. This investigation showed that both animal model of Tabata training and aerobic training induced increased expression of eNOS, which produces nitric oxide (NOx), which subsequently may dilate arteries, suggesting that Tabata training might improve arterial function via the same mechanism as conventional aerobic training and may decrease the risk of cardiovascular events.
The effects of Tabata training exercise on excess post-exercise oxygen consumption (EPOC) and diet-induced thermogenesis (DIT)
There has been a rumor that Tabata training is effective for losing body weight. However, the energy consumption during a high-intensity short-duration training exercise is negligible. After the exercise, the body’s oxygen uptake is higher than the resting metabolic rate, but EPOC after Tabata training exercise has not yet been quantified. The thermic effects of meals ingested after Tabata training have also not been evaluated. The resting oxygen uptake of human subjects after sprint-interval exercise was investigated with the use of a metabolic chamber for a > 22-h period, including the subjects’ intake of three meals. There were no observable differences in total resting oxygen uptake during the late recovery phase (3–22 h after the exercise period, at which point the EPOC had worn off) between the subjects’ exercise and non-exercise control days, suggesting that there was no effect of the preceding SIT on the subsequent meal-induced thermogenesis .
In contrast, a recent investigation reported that oxygen uptake after lunch and supper ingested 1.5 h and 7.5 h after Tabata training exercise, respectively, was higher than that measured on the non- exercise day for subjects weighing 64.4 ± 6.0 kg . This study showed that EPOC during the first 1.5 h after the Tabata training exercise, and ΔDIT defined as a difference in resting oxygen uptake from 12:00–23:00 between Tabata training exercise and non-exercise control day are 115.3 ± 32.3 and 146.1 ± 90.9 ml kg−1, respectively. These data suggest that EPOC and ΔDIT after Tabata training exercise were comparable with oxygen uptake during the Tabata training exercise (123.4 ± 12.0 ml kg−1). Energy consumption calculated from oxygen uptake during 10-min warm up exercise (WU), Tabata training exercise was 74.3 ± 5.2, 39.8 ± 6.3 kcal, respectively. EPOC during the first 1.5 h after Tabata training exercise and ΔDIT after Tabata training are 37.5 ± 12.7, and 47.8 ± 32.0 kcal, respectively. Summation of the previously described 4 energy consumption are 199.4 ± 12.4 kcal for the subjects. This value that is regarded as elevated energy consumption by Tabata training exercise could be the lowest in terms of securing weight reduction. However, after 6-week Tabata training, body weight was not changed . Therefore, weight reducing effect of Tabata training seems to be minimal.
The Tsuji et al. study  also reported that the ΔDIT was correlated with the VO2max of their subjects (52.1 ± 6.6 ml kg−1 min−1) (r = 0.76, n = 10, p < 0.05), suggesting that an improvement of the VO2max may further enhance the energy consumption elevated by diet. Another recent investigation  demonstrated that the lunch-enhanced thermogenesis (ΔDIT: approx. 1.5–5.5 h after exercise for subjects weighing 67.9 ± 7.7 kg) after Tabata exercise (15.7 ± 10.4 kcal) was greater than that after 30 min of exercise at 70% VO2max (6.6 ± 8.4 kcal), suggesting that the ΔDIT of high-intensity exercise was greater than that of the moderate-intensity exercise. However, again, in terms of reducing body weight, the ΔDIT after high-intensity intermittent exercise is limited even when the ΔDIT after the consumption of a meal is considered.
Recommended practical procedures for Tabata training
The first article regarding Tabata training was published over 30 years ago, and no further paper was published by the authors of the original article until recently. There has thus been some confusion about Tabata training, especially concerning the methodology. The following practical tips for executing authentic Tabata training are presented in order to prevent the misunderstanding of Tabata training in future studies.
Authentic Tabata training consists of 7–8 exhaustive sets of 20-s high-intensity bicycle exercise (intensity: 170% VO2max) with a 10-s rest between the exercise bouts [9, 10]. For determining the optimal exercise intensity of the training, the exercise intensity equivalent to the subject’s 170% VO2max is first determined. The 170% VO2max is an intensity that exhausts the subject by approx. 50 s of bicycling (if the subject continues to bicycle at that time) (Tabata, unpubl. data). The exercise intensity should be determined individually. The subject should then be instructed to continue bicycling until exhaustion (described below) after a 20-s cycling bout with a 10-s rest interval. If the subject can continue to bicycle for more than eight sets, the exercise intensity should be increased. If the subject cannot bike for less than six sets, the exercise intensity is reduced. Therefore, the intensity of Tabata training does not have to be 170% VO2max; the intensity that exhausts the subject during the seventh or eighth set should be used.
Exhaustion during bicycle exercise is determined as follows. During the bicycling, when the pedaling frequency tends to less than the fixed rate [normally 90 repetitions per minute (rpm)], we encourage the subject verbally with phrases such as ‘Come on, come on!’ With this verbal encouragement, a subject can often increase the pedaling frequency to 90 rpm. When encouragement has been given but the subject’s pedaling frequency gradually declines to 85 rpm, we define it as exhaustion and let the subject stop bicycling.
For bicycling exercise, it is important to raise the pedaling frequency to the fixed rate as soon as possible to set the correct load for the subject. A pedaling frequency of 100 rpm might be good for cyclists. In the original Tabata study, 90 rpm was used. The reason why we use a higher pedaling frequency than that used for normal bicycle exercise (50–70 rpm) is that without such a high pedaling frequency, a high-enough load cannot be set for heavy-weight top athletes. In the original Tabata training experiments, Monark bicycles (whose highest load is 7 kP) were used, but even with such a heavy weight, the load is not high enough to exhaust elite athletes within 7–8 sets of Tabata training if 50–70 rpm is used. By using 90 rpm, an adequate work rate, which is a function of weight (kP) and rpm, is assured for highly trained athletes.
Possible adverse effects of Tabata training
Because high-intensity exercise may reduce immunological functions , it can be speculated that in terms of the prevention of any type of cancer that may be initiated by low immunological function, high-intensity exercise training may have no effects or adverse effects. However, the results of a recent study suggested that Tabata training may help prevent colon cancer by enhancing the secretion and elevating the blood concentration of secreted protein acidic and rich in cysteine (SPARC) (Fig. 9), a myokine that decreases the number of aberrant crypt foci (ACF), which is the first step of colon cancer induction, by inducing the apoptosis of ACF in the colon . These biological results may explain the epidemiological finding that vigorous exercise may help prevent and not worsen colon cancer [67, 68]. Another recent investigation indicated that this result may reflect the evidence that Tabata training does not reduce immunological function .
Important contributions of other scientists
Among the many scientists who have examined Tabata training and other HIIT methods, the contribution of Dr. Martin Gibala to the popularity of HIIT among scientists and exercisers should be appreciated [52, 70–72]. He and his team conducted numerous studies on skeletal muscle adaptation after HIIT. These studies helped scientists further understand HIIT including Tabata training.
The use of Tabata training is usually an individual attempt by coaches and/or athletes. Scientific evidence from the sport fields is thus limited. Ravier reported that a running training protocol that was similar to Tabata training elevated the VO2max and MAOD of karate athletes who also performed other types of repetitive exercise . Evaluations of top athletes by researchers will help elucidate the effects of Tabata training on the performance of various sports. A determination of the effects of Tabata training using exercises that simulate the activities of specific sports is valuable in light of the specificity of training and training effects on sports performance.
However, in terms of effects on aerobic and anaerobic energy-releasing systems, there is not enough published data about training methods that follow protocols similar to Tabata training but use other types of exercise including running and various body-weight bearing exercises, which are frequently adopted by competitive runners and recreational exercisers, respectively. Effects of such exercise training on VO2max have been reported [74–80], and such research on similar protocol training methods is expected to determine the effects on anaerobic energy-releasing systems.
Since Tabata training induces the expression of proteins related not only to sports performance but also to health promotion , more research on the possible effects of Tabata training and other training that uses a Tabata protocol on health outcomes is expected.
Tabata training is very demanding , and thus participation in Tabata training might be limited to highly motivated athletes who are familiar with the scientific evidence regarding Tabata training or are persuaded to engage in the training by coaches who know the Tabata training research findings. In a study of women who were simply recreationally active, their perceived enjoyment of a weight-bearing HIIT increased from pre- to post-training, suggesting that chronic exposure to such training may elevate people’s enjoyment of the training . In addition, the dropout rate in the Chuiesiri et al. study of obese pre-adolescent boys  was quite low (6.3%), and Logan et al. reported a high adherence rate among inactive volunteer adolescents to an all-out-type HIIT using various types of weight bearing exercise; 90% of their subjects completed the regimen . These rates may indicate that the HIIT was tolerable and positively accepted. However, the results of another investigation suggested that training at high intensities would be rated as not enjoyable . A psychological inquiry regarding study subjects’ enjoyment of Tabata training is required. The development of low-intensity training using a Tabata protocol and training at the same intensity as that used in Tabata training (7–8 sets) but with a smaller number (3–4 sets) of exercise bouts  is expected; with a lower-intensity protocol, subjects would more easily enjoy the training.
As noted above, it also is necessary to investigate the possible detrimental side effects of Tabata training and other types of HIIT and to find solutions to prevent such side effects by diet/supplements, other physical conditioning, and/or other methods.
Lastly, in order to prescribe science-based training, more basic research on HIIT involving Tabata training is required to further delineate the mechanisms underlying the beneficial effects of this training on both sport-oriented and health-oriented outcomes, both of which contribute to improved quality of life.
Our studies have demonstrated that 6- to 12-week Tabata training increases the body’s VO2max by 9.2–15.0% and the MAOD by 20.9–35.0% [13, 36, 44]. A 2018 review of the Tabata protocol, which included various body-weight-bearing exercises, indicates that the VO2max is elevated by 5–18% after the training lasting 4–12 weeks . The magnitude of the elevation of the VO2max after Tabata training is similar to those of other HIIT and moderate-intensity aerobic exercise training types . 6-week Tabata training increased the MAOD by 17–28% [13, 36, 44]. These values are comparable to those obtained by other HIIT types [74, 75].
In conclusion, these improvements of both the aerobic and anaerobic energy-releasing systems after Tabata training are comparable to those provided by conventional aerobic and anaerobic training, including other types of HIIT, suggesting that Tabata training is useful to enhance sports performances that depend on both the aerobic and anaerobic energy-releasing systems for resynthesizing the ATP used during the specific sports.
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Tabata, I. Tabata training: one of the most energetically effective high-intensity intermittent training methods. J Physiol Sci 69, 559–572 (2019). https://doi.org/10.1007/s12576-019-00676-7