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

Table 2 Comparison of the parameters of the ${\dot{\text{V}}\text{O}}_{2}$ response kinetics of the reconstructed curve for the different transitions’ protocols

	S	SPost	MS	HS	MHS
${\dot{\text{V}}\text{O}}_{2}$ Baseline (L min⁻¹)	1.07 ± 0.16	1.04 ± 0.21	0.97 ± 0.19	1.02 ± 0.23	1.01 ± 0.21
Ap (L min⁻¹)	2.02 ± 0.27	2.16 ± 0.30	2.24 ± 0.29^*	2.15 ± 0.30	2.24 ± 0.30^*
Gain Ap (mL min⁻¹ W⁻¹)	8.96 ± 0.73	9.56 ± 0.78	9.95 ± 1.02^*	9.55 ± 1.20	9.95 ± 1.12^*
TDp (s)	10.21 ± 5.54	11.76 ± 4.72	11.41 ± 6.34	13.19 ± 4.73	10.64 ± 5.69
τp (s)	29.31 ± 9.46	28.27 ± 6.79	31.25 ± 7.51	31.00 ± 6.69	40.58 ± 11.68^*§£$
MRT (s)	39.52 ± 5.28	40.03 ± 4.21	42.65 ± 5.86	44.19 ± 4.25	51.22 ± 7.07^*§£$
As (L min⁻¹)	0.56 ± 0.13	0.44 ± 0.10	0.41 ± 0.15^*	0.53 ± 0.11	0.46 ± 0.17
${\dot{\text{V}}\text{O}}_{2}$ End (L min⁻¹)	3.65 ± 0.38	3.63 ± 0.35	3.62 ± 0.41	3.70 ± 0.34	3.71 ± 0.38
Gain End (mL min⁻¹ W⁻¹)	11.47 ± 0.78	11.56 ± 0.67	11.77 ± 0.92	11.90 ± 1.20	11.99 ± 0.84

MS: kinetics sum of M + S; HS: Kinetics sum of H and S; MHS: kinetics sum of M + H+S. 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 MS; ^$significant differences with HS (p < 0.05)

ISSN: 1880-6562

	S	SPost	MS	HS	MHS
\({\dot{\text{V}}\text{O}}_{2}\) Baseline (L min⁻¹)	1.07 ± 0.16	1.04 ± 0.21	0.97 ± 0.19	1.02 ± 0.23	1.01 ± 0.21
Ap (L min⁻¹)	2.02 ± 0.27	2.16 ± 0.30	2.24 ± 0.29^*	2.15 ± 0.30	2.24 ± 0.30^*
Gain Ap (mL min⁻¹ W⁻¹)	8.96 ± 0.73	9.56 ± 0.78	9.95 ± 1.02^*	9.55 ± 1.20	9.95 ± 1.12^*
TDp (s)	10.21 ± 5.54	11.76 ± 4.72	11.41 ± 6.34	13.19 ± 4.73	10.64 ± 5.69
τp (s)	29.31 ± 9.46	28.27 ± 6.79	31.25 ± 7.51	31.00 ± 6.69	40.58 ± 11.68^*§£$
MRT (s)	39.52 ± 5.28	40.03 ± 4.21	42.65 ± 5.86	44.19 ± 4.25	51.22 ± 7.07^*§£$
As (L min⁻¹)	0.56 ± 0.13	0.44 ± 0.10	0.41 ± 0.15^*	0.53 ± 0.11	0.46 ± 0.17
\({\dot{\text{V}}\text{O}}_{2}\) End (L min⁻¹)	3.65 ± 0.38	3.63 ± 0.35	3.62 ± 0.41	3.70 ± 0.34	3.71 ± 0.38
Gain End (mL min⁻¹ W⁻¹)	11.47 ± 0.78	11.56 ± 0.67	11.77 ± 0.92	11.90 ± 1.20	11.99 ± 0.84