Metaboreceptor-mediated Muscle Oxygen Saturation during Recovery Following Isometric Handgrip Exercise

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概要

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• The aim of the present study was to determine whether oxygen supply to non-exercised muscle during recovery following fatiguing exercise is influenced by accumulated metabolites within exercised muscle. Twelve healthy male subjects performed 2-min isometric handgrip exercise at 40% maximal voluntary contraction with their right hand and the exercise was followed by a 3-min recovery period. Muscle oxygen saturation (SmO_2) determined by near-infrared spatially resolved spectroscopy was used as an index of oxygen supply to non-exercised muscle and was measured in biceps brachii and tibialis anterior muscles on the left side. Compared to the pre-exercise baseline level, SmO_2 in the biceps brachii muscle (SmO_<2BB>) increased significantly from 30sec to 1min after the start of exercise, while SmO_2 in the tibialis anterior muscle (SmO_<2TA>) remained stable during the initial 1min of exercise. Both SmO_<2BB> and SmO_<2TA> began to decrease at about 1min and continued to decrease thereafter. Due to the initial increase in SmO_<2BB>, only SmO_<2TA> showed a significant decrease during exercise. During recovery, SmO_<2BB> did not differ significantly from the pre-exercise baseline level, whereas SmO_<2TA> remained significantly lower until about 1.5min of recovery and then it did not differ significantly from the baseline level. In another bout, subjects performed handgrip exercise of the same intensity, but post-exercise arterial occlusion (PEAO) of the exercised muscle was imposed for 2 min immediately after the end of exercise. During PEAO, SmO_<2BB> decreased significantly compared to the baseline level, whereas SmO_<2TA> remained significantly lower until the end of PEAO. The significant decrease in SmO_<2BB> and the prolongation of decrease in SmO_<2TA> by PEAO suggests that the recovery of SmO_2 in the non-exercised arm and leg is mediated by muscle metaboreceptors.

著者

• Ogata Hisayoshi

  Department Of Rehabilitation For Movement Functions Research Institute Of National Rehabilitation Ce

• Akai Masami

  Department Of Rehabilitation For Movement Functions Research Institute Of National Rehabilitation Ce

• Akai Masami

  Department Of Motor Dysfunction Research Institute Of National Rehabilitation Center For The Disable

• Nakazawa Kimitaka

  Department of Rehabilitation for Movement Functions, Research Institute of National Rehabilitation C

• Nakazawa Kimitaka

  Department Of Rehabilitation For Movement Functions Research Institute Of National Rehabilitation Ce

• Nakazawa Kimitaka

  Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo

関連論文

• Metaboreceptor-mediated Muscle Oxygen Saturation during Recovery Following Isometric Handgrip Exercise
• Evidence-based medicine for orthopedic practice
• Neural control of human gait and posture

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