小泉, 佳右

藤田, 幸雄

KOIZUMI, Keisuke

FUJITA, Yukio

[ABSTRACT] The purpose of this study was to investigate the effect of active recovery after an intensive cycle exercise in a sinusoidaly loaded mode (sinusoidal exercise: SE). Ten physically fit males performed the 10 min SE in the middle of two 10 s maximum cycle exercise tests. The mean value of SE was set to the each subject's ventilatory threshold level (100%Power@VT), with an amplitude of 25%Power@VT and 60 s period. After the SE, the subjects were given an interval recovery (IR) for 10 min. During IR, they rested in a recovery condition either to cycle at a steady level of 50%Power@VT (50%Act) or 25 %Power@VT (25%Act), or relaxing in a sitting position (Pas). After IR, the subjects carried out 30s Wingate test (WT) . The blood lactate concentration at the end of IR period was significantly lower in 50%Act (4.20 ± 2.26 mmol / l) and 25%Act (5.11 ± 2.79 mmol / l) than Pas (7.18 ± 4.39 mmol / l; p < 0.01 vs. both conditions). The amount of carbon dioxide production by bicarbonate buffering after the beginning of WT was greater in 50%Act (56.0 ± 16.1 ml/ kg) than Pas (45.6 ± 10.7 ml/ kg; p < 0.05). These results indicate that oxidization of lactic acid during the active recovery inhibits bicarbonate buffering utilization.