Prior Heavy Exercise Enhances Performance during Subsequent Perimaximal Exercise


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Abstract

JONES, A. M., D. P. WILKERSON, M. BURNLEY, and K. KOPPO. Prior Heavy Exercise Enhances Performance during Subsequent Perimaximal Exercise. Med. Sci. Sports Exerc., Vol. 35, No. 12, pp. 2085–2092, 2003.PurposeTo test the hypothesis that prior heavy exercise increases the time to exhaustion during subsequent perimaximal exercise.MethodsSeven healthy males (mean ± SD 27 ± 3 yr; 78.4 ± 0.7 kg) completed square-wave transitions from unloaded cycling to work rates equivalent to 100, 110, and 120% of the work rate at V̇O2peak (W-V̇O2peak) after no prior exercise (control, C) and 10 min after a 6-min bout of heavy exercise at 50% Δ (HE; half-way between the gas exchange threshold (GET) and V̇O2peak), in a counterbalanced design.ResultsBlood [lactate] was significantly elevated before the onset of the perimaximal exercise bouts after prior HE (2.5 vs 1.1 mM; P < 0.05). Prior HE increased time to exhaustion at 100% (mean ± SEM. C: 386 ± 92 vs HE: 613 ± 161 s), 110% (C: 218 ± 26 vs HE: 284 ± 47 s), and 120% (C: 139 ± 18 vs HE: 180 ± 29 s) of W-V̇O2peak, (all P < 0.01). V̇O2 was significantly higher at 1 min into exercise after prior HE at 110% W-V̇O2peak (C: 3.11 ± 0.14 vs HE: 3.42 ± 0.16 L·min−1; P < 0.05), and at 1 min into exercise (C: 3.25 ± 0.12 vs HE: 3.67 ± 0.15; P < 0.01) and at exhaustion (C: 3.60 ± 0.08 vs HE: 3.95 ± 0.12 L·min−1; P < 0.01) at 120% of W-V̇O2peak.ConclusionsThis study demonstrate that prior HE, which caused a significant elevation of blood [lactate], resulted in an increased time to exhaustion during subsequent perimaximal exercise presumably by enabling a greater aerobic contribution to the energy requirement of exercise.

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