We investigated whether the elevated muscle temperature induced by the first bout influenced V̇O 2 the response during a second-bout of heavy exercise. The control conditions were two consecutive 6-min leg cycling bouts (work rate: δ50% between LT and V̇O 2 max) separated by a 6-min baseline at 20 W (L1-ex to L2-ex). In the experimental conditions prior to the main bout (H2-ex), the diathermic warming to the front thigh was substituted for the first-bout. The V̇O 2 response for the second bout was significantly accelerated compared with the first bout (mean ± SD of the τ by monoexponential fitting: L1-ex: 53.8 ± 11.6, L2-ex: 38.7 ± 7.9 s, P < 0.05). The diathermic warm-up, however, could not accelerate response for subsequent supra-LT leg exercise (τ for H2-ex: 52.3 ± 7.7 s). It was concluded that the facilitation of V̇O 2 response during supra-LT exercise after prior heavy exercise does not seem to be caused by increased muscle temperature per se and its related factors.
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