Table 2.

$\dot{\text{V}}$O₂ and deoxy-[Hb+Mb] kinetic parameters for the transition to moderate intensity exercise.

	YI	YR	YT	OI	OR	OT
$\dot{\text{V}}$O2 KINETICS
$\dot{\text{V}}$O2 BSLN (L·min−1)	1.15 ± 0.15	1.13 ± 0.13	1.02 ± 0.09§,Φ	0.90 ± 0.15*	1.06 ± 0.08*	1.09 ± 0.09§,*
$\dot{\text{V}}$O2 AMP (L·min−1)	0.51 ± 0.13	0.77 ± 0.15†	1.22 ± 0.30†,‡	0.45 ± 0.13*	0.45 ± 0.12*	0.58 ± 0.11†,‡,*
$\dot{\text{V}}$O2 GAIN (mL·W−1)	10.3 ± 0.5	10.1 ± 0.5	10.4 ± 1.4	10.2 ± 1.7	10.0 ± 0.7	10.4 ± 0.7
TD $\dot{\text{V}}$O2 (s)	14.2 ± 6.9	13.2 ± 4.1	16.7 ± 1.7	15.1 ± 6.1*	18.6 ± 5.9*	20.4 ± 3.1*
τ$\dot{\text{V}}$O2 (s)	38.8 ± 10.4	26.8 ± 7.5†	15.0 ± 3.4†,‡	44.8 ± 10.9	26.6 ± 6.5†	16.9 ± 2.7†,‡
CI95 (s)	7.8 ± 2.5	4.3 ± 1.2†	2.0 ± 0.9†,‡	7.7 ± 5.5*	6.3 ± 2.6†*	4.1 ± 1.0†,‡,*
Deoxy-[Hb+Mb] KINETICS
CTD deoxy-[Hb+Mb] (s)	8.9 ± 3.6	10.0 ± 1.8	8.0 ± 2.4	12.2 ± 5.0	9.2 ± 2.6	10.4 ± 3.9
τ deoxy-[Hb+Mb] (s)	12.5 ± 3.1	9.0 ± 2.9	7.2 ± 3.4	9.2 ± 1.8	13.4 ± 7.5	10.1 ± 4.4
τ' deoxy-[Hb+Mb] (s)	21.4 ± 4.6	19.0 ± 3.1	15.2 ± 3.9	21.4 ± 4.5	22.6 ± 8.6	20.5 ± 2.7
deoxy-[Hb+Mb]/$\dot{\text{V}}$O2	1.23 ± 0.05	1.11 ± 0.03†	1.01 ± 0.03†,‡	1.29 ± 0.08	1.13 ± 0.06†	1.06 ± 0.03†,‡
MOD (W)	69 ± 12	96 ± 14†	137 ± 24†,‡	64 ± 13	65 ± 12*	76 ± 10†,‡,*

Values are mean ± SD. τ, time constant of response; τ' deoxy-[Hb+Mb], sum of τ deoxy-[Hb+Mb] and CTD deoxy-[Hb+Mb]; BSLN, baseline; AMP, Amplitude; GAIN, functional gain; MOD, moderate intensity work rate; CI₉₅, 95% confidence interval; CTD, calculated time delay for deoxy-[Hb+Mb]; deoxy-[Hb+Mb], deoxygenated hemoglobin concentration; TD, time delay.

^†Significantly different from inactive group (p < 0.05);

^‡Significantly different from recreationally active group (p < 0.05);

^*Significantly different from training-matched age group (p < 0.05);

^§Significantly different from age-matched inactive group (p < 0.05);

^ΦSignificantly different from age-matched recreationally active group (p < 0.05).