利き腕,非利き腕運動時の筋交感神経反応

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The aim of the study was to test whether muscle sympathetic nerve activity (MSNA) response during handgrip exercise performed with the dominant and non-dominant arm was different. Sixteen right handed healthy volunteers were performed two kind of handgrip exercise; intermittent static handgrip for 15 sec repeated ten times in each side arm with maximal voluntary effort and rhythmic handgrip under the forearm circulation arrest with maximal effort followed by two minutes post exercise arterial occlusion (PEAO). MSNA recorded from the tibial nerve using microneurography technique and was expressed as total activity (bursts x burst area: unit). Heart rate and handgrip force was measured simultaneously. MSNA response during static handgrip was significantly increased at the first handgrip exercise and the elevated activity persisted until ten repetitions while the response was not different between dominant and non-dominant arm. During rhythmic handgrip with ischemia and PEAO, MSNA increased 197% and 369% of resting value for dominant and 140% and 197% for non-dominant arm respectively, and those differences between dominant and non-dominant arm were significant. Heart rate increased during intermittent handgrip as well as rhythmic handgrip exercise, whereas no significant differences in heart rate response between the arms were found. Mean blood pressure elevated during intermittent handgrip exercise and post exercise ischemia in dominant and non-dominant arm, while the responses were not different between arms. Force output of handgrip was not different between arms in either exercise paradigm. This study demonstrated that the MSNA response to muscle contraction was different in dominant and non-dominant arm and the difference may be due to the difference in extent of muscle metaboreflex rather than that exercise effort or central command.
日本運動生理学会の論文
2006-02-28

利き腕,非利き腕運動時の筋交感神経反応

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