Estimation of Oxygen Cost of Internal Power during Cycling Exercise with Changing Pedal Rate

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概要

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• It has been reported that oxygen uptake (VO_2) increases exponentially with levels of the pedal rate during cycling. The purpose of this study was therefore to test the hypothesis that the O_2 cost for internal power output (P_<int>) exerted in exercising muscle itself would be larger than for an external power output (P_<ext>) calculated from external load and pedal rate during cycling exercise under various conditions of P_<int> and P_<ext> in a large range of pedal rates. The O_2 cost (ΔVO_2/Δpower output) was investigated in three experiments that featured different conditions on a cycle ergometer that were carried out at the same levels of total power output (P_<tot>; sum of P_<int> and P_<ext>) (Exp. 1), P_<ext> (Exp. 2) and load (Exp. 3). Each experiment consisted of three exercise tests with three levels of pedal rate (40rpm for a lower pedal rate: LP; 70-80 rpm for a moderate pedal rate: MP; and 100-120 rpm for a higher pedal rate: HP) lasting for 2-3 min of unloaded cycling followed by 4-5 min of loaded cycling. Blood lactate accumulations (2.3-3.4mmol1^<-1>) at the HP were significantly higher compared with the LP (0.6-0.9 mmol1^<-1>) and MP (0.9-1.0 mmol1^<-1>) except for the LP in Exp. 1. The VO_2 (360-432 ml min^<-1> for LP, 479-644 ml min^<-1> for MP, 960-1602 ml min^<-1> for HP) during unloaded cycling in the three experiments increased exponentially with increasing pedal rates regardless of P_<ext>=0. Moreover, the slope of the VO_2-P_<int> (13.7 ml min^<-1> W^<-1>) relation revealed a steeper inclination than that of the VO_2-P_<ext> (10.2 ml min^<-1> W^<-1>) relation. We concluded that the O_2 cost for P_<int> was larger than for P_<ext> during the cycling exercises, indicating that the O_2 cost for P_<tot> could be affected by the ratio of P_<int> to P_<tot> due to the levels of pedal rate.

• 日本生理人類学会の論文

著者

• Hirakoba Kohji

  Department Of Biological Functions And Engineering Graduate School Of Life Science And Systems Engin

• TOKUI Masato

  Department of Biological Functions and Engineering, Kyushu Institute of Technology Graduate School o

• Tokui Masato

  Department Of Sports Science Faculty Of Sports Science Kyushu Kyoritsu University

• Tokui Masato

  Department Of Biological Functions And Engineering Kyushu Institute Of Technology Graduate School Of

関連論文

• Blood Lactate Changes during Isocapnic Buffering in Sprinters and Long Distance Runners
• Oxygenation Kinetics in Superficial and Deep Tissue Layers of Biceps Brachii during Dynamic Muscle Contraction (Proceedings of the 54th Meeting of Japan Society of Physiological Anthropology)
• Prediction of Blood Lactate Accumulation from Excess CO_2 Output during Constant Exercise
• 1-6 Relationship between Internal Work and Metabolic Rate During Cycling Exercise(Proceedings of the 53rd Meeting of Japan Society of Physiological Anthropology)
• Estimation of Oxygen Cost of Internal Power during Cycling Exercise with Changing Pedal Rate

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