Table 2.
Parameter estimates for exponential curve fitting of muscle V̇O2 response to exercise at 10, 30 and 50 W for the trained (TL) and untrained leg (CL)
| 10 W | 30 W | 50 W | ||||
|---|---|---|---|---|---|---|
| CL | TL | CL | TL | CL | TL | |
| Baseline (BL; ml min−1) | 26 ± 4 | 18 ± 3 | 24 ± 4 | 21 ± 5 | 27 ± 5 | 20 ± 2 |
| Time delay (TD1; s) | 9 ± 3 | 10 ± 2 | 9 ± 2 | 7 ± 1 | 5 ± 2 | 6 ± 1 |
| Gain (G1; ml min−1) | 182 ± 10 | 184 ± 11 | 425 ± 37# | 449 ± 20# | 719 ± 32# | 761 ± 63# |
| Time constant (τ1; s) | 21 ± 4 | 22 ± 3 | 33 ± 5 | 25 ± 5 | 47 ± 9# | 28 ± 4* |
Values are means ± s.e.m. One-component (10 W) or two-component (30 and 50 W) exponential fits were used as described by Barstow & Molé (1991), i.e. VO2(t) = VO2(BL) + G1(1 − exp−(t−TD1)/τ1) + G2(1 − exp−(t−TD2)/τ2), where V̇O2(t) is the V̇O2 at any given time point. The fitting parameters for the primary phase were the time delay (TD1), gain (G1) and time constant (τ1). The least sum of squared error was used as the criterion for convergence.
*
Significant difference (P < 0.05) between TL and CL.
#
Significant different (P < 0.05) from 10 W within the same leg.