The metabolic profiles of different fiber type populations under the emergence of the slow component of oxygen uptake

Table 1 Comparison of the parameters of the ${\dot{\text{V}}\text{O}}_{2}$ response kinetics in the different transitions

	S	SPost	M → S	H → S	MH → S
${\dot{\text{V}}\text{O}}_{2}$ Baseline (L min⁻¹)	1.07 ± 0.16	1.04 ± 0.21	1.85 ± 0.21^*§	2.89 ± 0.23^*§£	2.90 ± 0.25^*§£
Ap (L min⁻¹)	2.02 ± 0.27	2.16 ± 0.30^*	1.43 ± 0.26^*§	0.77 ± 0.15^*§£	0.70 ± 0.15^*§£
Gain Ap (mL min⁻¹ W⁻¹)	8.96 ± 0.73	9.56 ± 0.78	10.23 ± 0.60^*	13.70 ± 1.50^*§£	12.27 ± 1.16^*§£$
TDp (s)	10.21 ± 5.54	11.76 ± 4.72	6.17 ± 5.37	6.06 ± 8.81	7.16 ± 9.83
τp (s)	29.31 ± 9.46	28.27 ± 6.79	46.51 ± 11.00^*§	95.94 ± 19.61^*§£	93.43 ± 13.83^*§£
MRT (s)	39.52 ± 5.28	40.03 ± 4.21	52.67 ± 12.46	102.00 ± 27.57^*§£	100.59 ± 18.17^*§£
As (L min⁻¹)	0.56 ± 0.13	0.44 ± 0.10^*	0.33 ± 0.10^*§	0.07 ± 0.07^*§£	0.10 ± 0.07^*§£
${\dot{\text{V}}\text{O}}_{2}$ End (L min⁻¹)	3.65 ± 0.38	3.63 ± 0.35	3.61 ± 0.37	3.73 ± 0.33^§£	3.70 ± 0.37
GainEnd (mL min⁻¹ W⁻¹)	11.47 ± 0.78	11.56 ± 0.67	12.62 ± 0.78^*§	15.00 ± 1.96^*§£	14.11 ± 1.55^*§£

S: severe intensity; SPost: severe intensity after prior severe intensity; M: moderate intensity; H: heavy intensity. ${\dot{\text{V}}\text{O}}_{2}$ baseline: oxygen consumption at the beginning of exercise; Ap: amplitude of the primary phase; GainAp: increase in ${\dot{\text{V}}\text{O}}_{2}$ above baseline per unit increase in external work rate above baseline; TDp: time delay of the primary phase; τp: time constant of the primary phase; MRT: the sum of the TDp and τp; As: amplitude of the secondary phase; ${\dot{\text{V}}\text{O}}_{2}$ end, averaged amplitude from the last 30 s of the response; GainEnd: sum of the Ap and As per unit increase in external work rate above baseline. Values are presented as the mean SD
*Significant differences with S; ^§significant differences with SPost; ^£significant differences with M → S; ^$significant differences with H → S (p < 0.05)

ISSN: 1880-6562

	S	SPost	M → S	H → S	MH → S
\({\dot{\text{V}}\text{O}}_{2}\) Baseline (L min⁻¹)	1.07 ± 0.16	1.04 ± 0.21	1.85 ± 0.21^*§	2.89 ± 0.23^*§£	2.90 ± 0.25^*§£
Ap (L min⁻¹)	2.02 ± 0.27	2.16 ± 0.30^*	1.43 ± 0.26^*§	0.77 ± 0.15^*§£	0.70 ± 0.15^*§£
Gain Ap (mL min⁻¹ W⁻¹)	8.96 ± 0.73	9.56 ± 0.78	10.23 ± 0.60^*	13.70 ± 1.50^*§£	12.27 ± 1.16^*§£$
TDp (s)	10.21 ± 5.54	11.76 ± 4.72	6.17 ± 5.37	6.06 ± 8.81	7.16 ± 9.83
τp (s)	29.31 ± 9.46	28.27 ± 6.79	46.51 ± 11.00^*§	95.94 ± 19.61^*§£	93.43 ± 13.83^*§£
MRT (s)	39.52 ± 5.28	40.03 ± 4.21	52.67 ± 12.46	102.00 ± 27.57^*§£	100.59 ± 18.17^*§£
As (L min⁻¹)	0.56 ± 0.13	0.44 ± 0.10^*	0.33 ± 0.10^*§	0.07 ± 0.07^*§£	0.10 ± 0.07^*§£
\({\dot{\text{V}}\text{O}}_{2}\) End (L min⁻¹)	3.65 ± 0.38	3.63 ± 0.35	3.61 ± 0.37	3.73 ± 0.33^§£	3.70 ± 0.37
GainEnd (mL min⁻¹ W⁻¹)	11.47 ± 0.78	11.56 ± 0.67	12.62 ± 0.78^*§	15.00 ± 1.96^*§£	14.11 ± 1.55^*§£