<Originals>Relationship Between Oxygen Supply and Consumption in Exercised Muscle During Recovery

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概要

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• KAWAHARA, Y., MIZUNO, M., IWAKAWA, T., NAKAMURA, Y. and MURAOKA, I. Relationship Between Oxygen Supply and Consumption in Exercised Muscle During Recovery. Adv. Exerc. Sports Physiol., Vol.11, No.2 pp55-60, 2005. The purposes of this study were to measure muscle oxygenation kinetics and the oxygen consumption index (OCI) and the oxygen supply index (OSI) during recovery by near-infrared spectroscopy (NIRS), and to investigate whether oxygen consumption is the major stimulus of oxygen supply to the exercised muscle. We also measured tympanic temperature and blood lactate concentraion to examine whether these factors contribute to the elevated blood flow. After 30 min rest in the supine position, eight healthy male subjects performed bicycle exercise at 70% Vo2max for 20 min and then rested in the supine position for 2 h. The NIRS probe was applied to the belly of the vastus lateralis muscle, and we observed total hemoglobin/myoglobin concentration (TotalHb/Mb) and oxy-and deoxy-hemoglobin/myoglobin concentration (OxyHb/Mb, DeoxyHb/Mb), and calculated OCI and OSI from changes in NIRS parameters during venous occlusion. TitalHb/Mb and OxyHb/Mb remained elevated until 120 min postexercise. DeoxyHb/Mb was lower at 30 and 60 min postexercise than at rest and returned to the resting level 90 min postexercise. The OSI remained elevated until 90 min postexercise, whereas the OCL returned to the resting value by 60 min postexercise. Blood lactate concentraiton remaind higher than the resting value until 30 min postexercise and returned to the restion value by 60 min postexercise. Tympanic temperateure also returned to the resting value by 30 min postexercise. Our results suggested that oxygen consumption is not the major stimulus of elevated blood flow in the exercised muscle after 30 min postexercise. Lactate accumulation and body temperature do not seem to contribute much to the increased blood flow. Further investigation is needed to indentify the causes of elevated blood flow after 30 min postexercise.

• 日本運動生理学会の論文

著者

• Mishina Masahiro

  Positron Medical Center Tokyo Metropolitan Institute Of Gerontology

• Mishina Masahiro

  東京都老人総合研究所ポジトロン医学研究施設

• Mishina Masahiro

  日本医科大学千葉北総病院 神経内科

• Mishina Masahiro

  放射線医学総合研究所分子イメージング研究センター 先端生体計測研究グループ

• MIZUNO Masaki

  Graduate School of Human Sciences, Waseda University

• IWAKAWA Takashi

  Graduate School of Human Sciences, Waseda University

• NAKAMURA Yoshio

  School of Sport Sciences, Waseda University

• MURAOKA Isao

  School of Sport Sciences, Waseda University

• Iwakawa Takashi

  Graduate School Of Human Sciences Waseda University

• Mizuno Masaki

  早稲田大学 人間科学研究科

• Mizuno Masaki

  Faculty Of Sport Sciences Waseda University

• KAWAHARA Yayoi

  Graduate School of Human Sciences, Waseda University

• Muraoka Isao

  School Of Sports Sciences Waseda University

• Muraoka Isao

  School Of Human Sciences Waseda University

• Kawahara Yayoi

  Graduate School Of Human Sciences Waseda University

• Nakamura Yoshio

  School Of Sports Sciences Waseda University

• Nakamura Yoshio

  School Of Human Sciences Waseda University

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