Blood Lactate Changes during Isocapnic Buffering in Sprinters and Long Distance Runners

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概要

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• This study was carried out to compare blood lactate changes in isocapnic buffering phase in an incremental exercise test between sprinters and long distance runners and to seek the possibility for predicting aerobic or anaerobic potential from blood lactate changes in isocapnic buffering phase. Gas exchange variables and blood lactate concentration ([lactate]) in six sprinters (SPR) and nine long distance runners (LDR) were measured during an incremental exercise test (30W・min^<-1>) up to subject's voluntary exhaustion on a cycle ergometer. Using a difference between [lactate] at lactate threshold (LT) and [lactate] at the onset of respiratory compensation phase (RCP) and the peak value of [lactate] obtained during a recovery period from the end of the exercise test, the relative increase in [lactate] during the isocapnic buffering phase ([lactate]_<ICBP>) was assessed. The [lactate] at LT (mean±SD) was similar in both groups (1.36±0.27 for SPR vs. 1.24±0.24 mmol・l^<-1> for LDR), while the [lactate] at RCP and the peak value of [lactate] were found to be significantly higher in SPR than in LDR (3.61±0.33 vs. 2.36±0.45 mmol・l^<-1> for RCP, P<0.001 10.18±1.53 vs. 8.10±1.61 mmol・l^<-1> for peak, P<0.05). The [lactate]_<ICBP> showed a significantly higher value in SPR (22.5±5 9% P<0.05) compared to that in LDR (14.2±5.0%) as a result of a twofold greater increase of [lactate] from LT to RCP (2.25±0.49 for SPR vs. 1.12±0.39 mmol・l^<-1> for LDR). In addition, the [lactate]_<ICBP> inversely correlated with oxygen uptake at LT (VO_2LT, r=-0.582, P<0.05) and maximal oxygen uptake (VO_2max, r=-0.644, P<0.01). The results indicate that the [lactate]_<ICBP> is likely to give an index for the integrated metabolic, respiratory and buffering responses at the initial stage of metabolic acidosis derived from lactate accumulation.

• 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

• Hirakoba Kohji

  Department Of Human Sciences Kyushu Institute Of Technology

• Yunoki Takahiro

  Faculty Of Education Hokkaido University

関連論文

• 2-O-46 Effect of blood flow distribution on oxygen uptake kinetics in incremental-load supine exercise(The Proceedings of the 17th Annual Meetings of Japan Society of Exercise and Sports Physiology Jury 25-26, (Tokyo))
• 1P-Y-27 Kinetics of heart rate and oxygenation in inactive muscle during constant load supine exercise(The Proceedings of the 16th Annual Meetings of Japan Society of Exercise and Sports Physiology August 2-3, (Nara))
• 31. Effect of blood volume in inactive muscle on heart rate drift during prolonged exercise(The Proceedings of the 15th Annual Meetings of Japan Society of Exercise and Sports Physiology July 26-27, (Hirosaki))
• 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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