Factors Influencing Excess CO2 Output During and After Short Duration-Intensive Exercise: Focusing on Skeletal Muscle Characteristics
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概要
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The purpose of this study was to investigate the relationship between excess CO2 output during and after short duration-intensive exercise and skeletal muscle characteristics (i.e., muscle fiber type, muscle capillary density and muscle buffering capacity). Twelve healthy males (age; 22.4±2.9 years, height; 172.3±5.8 cm, weight; 65.0±4.8 kg) performed 30-s maximal cycle ergometer sprinting. Excess CO2 output during and after exercise was obtained through respiratory gas analysis. Excess CO2 output per unit of time (ExcessVCO2) was calculated by subtracting VO2 from VCO2 during and after exercise. Muscle biopsy samples were taken from the right vastus lateralis muscle, and then muscle fiber type, muscle capillary density and muscle buffering capacity were measured. ExcessCO2 calculated as the sum of ExcessVCO2 from the onset of exercise until 15 min after exercise was not significantly correlated with any muscle fiber types, while it was significantly correlated with capillary-to-fiber ratio (r = 0.791, p < 0.01). A significant negative correlation was also demonstrated between ExcessCO2-to-La peak ratio and muscle buffering capacity (r = -0.645, p < 0.05). These results suggest that ExcessCO2 during and after short duration-intensive exercise is affected by the amount of H+ buffered by nonbicarbonate system and the amount of H+ diffusion from muscle to blood depending on the development of muscle capillaries.
- Japan Society of Physical Education, Health and Sport Sciencesの論文
著者
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Suzuki Yasuhiro
Department Of Breast And Endocrine Surgery Tokai University School Of Medicine
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Takamatsu Kaoru
Institute Of Health And Sciences University Of Tsukuba
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Mukai Naoki
Institute of Health and Sport Sciences, University of Tsukuba
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Maemura Hirohiko
Doctoral Program in Halth and Sport Sciences, University of Tsukuba
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