| Muscle sympathetic nerve activity during intermittent handgrip exercise. | |
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MedLine Citation:
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PMID: 23187331 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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AIM: This study evaluated whether central command plays an important role in activating muscle sympathetic nerve activity (MSNA) during short-term maximal handgrip contractions. METHODS: The increase in MSNA was examined while influence of minimizing for other factors such as mechanoreflex, metaboreflex and fatigue during repetitive exercise in seven 19- to 26-year-old participants. Maximal voluntary handgrips (15-s contraction with a 45-s relaxation) were performed 10 times with a 15-s pause between alternate hands. MSNA was recorded from the tibial nerve analyzed using the burst frequency (BF) and total sympathetic nerve activity. RESULTS: The BF increased with the first unit, from 14.9±1.8 bursts·min-1 at baseline to 27.7±3.4 bursts·min-1 during contraction. The increase in the MSNA during contractions remained unchanged throughout the repetitions. The BF declined to baseline during the relaxation periods. The peak grip force decreased from 333±25 N for the first grip to 216±20 N for the last contraction. The MSAN increase remained constant despite a possible reduction in mechanoreflex during exercise as indicated from decreased maximal handgrip force. CONCLUSION: We suggested that the MSNA response was induced mainly by central command during short-term maximal handgrip contraction without metaboreflex influence and attenuated mechanoreflex input. |
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Authors:
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T Hachiya; S Aizawa; A P Blaber; M Saito |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of sports medicine and physical fitness Volume: 52 ISSN: 0022-4707 ISO Abbreviation: J Sports Med Phys Fitness Publication Date: 2012 Dec |
Date Detail:
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Created Date: 2012-11-28 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0376337 Medline TA: J Sports Med Phys Fitness Country: Italy |
Other Details:
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Languages: eng Pagination: 665-73 Citation Subset: IM |
Affiliation:
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Laboratory of Applied Physiology, Toyota Technological Institute, Nagoya 468-0511, Japan - thachiya@hotmail.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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