An Electrophysiological Investigations of the Human Triceps Surae Muscle after a Simulated Microgravity Environment
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2022
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| author | Yuri A, Koryak |
| author_facet | Yuri A, Koryak |
| contents | <p>This paper compares the effects of 7-day “dry” water immersion (DI) and intermittent muscle contractions on electrical and mechanical failure during muscle fatigue in the human Triceps Surae (TS) muscle electrically stimulated at 50 impulses s-1 via its motor nerve. 1-s intervals separated intermittent contractions of 60-s duration for the identical duration of tension development. The 60-s intermittent contractions decreased tetanic force to 57% (p < 0.05) of initial values, but force reduction was not significantly different in the two fatigue tests: the fatigue index was (36.2 ± 5.4)% <em>vs.</em> (38.6 ± 2.8)%, respectively (p > 0.05). While identical force reduction was present in the two fatigue tests, it would appear that concomitant electrical failure was considerably different. This electromechanical dissociation would suggest that slowing conduction along nerve and muscle membranes did not explain the observed mechanical failure. It is suggested that intracellular processes played a major role in contractile failure during intermittent contractions after muscle disuse. </p> <p> </p> <div> <h2> </h2> </div> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_14911371 |
| institution | Zenodo |
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| publishDate | 2022 |
| publisher | Zenodo |
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| spellingShingle | An Electrophysiological Investigations of the Human Triceps Surae Muscle after a Simulated Microgravity Environment Yuri A, Koryak "dry" Water immersion Human triceps surae Isometric intermittent contraction Surface action potential Muscle Fatigue <p>This paper compares the effects of 7-day “dry” water immersion (DI) and intermittent muscle contractions on electrical and mechanical failure during muscle fatigue in the human Triceps Surae (TS) muscle electrically stimulated at 50 impulses s-1 via its motor nerve. 1-s intervals separated intermittent contractions of 60-s duration for the identical duration of tension development. The 60-s intermittent contractions decreased tetanic force to 57% (p < 0.05) of initial values, but force reduction was not significantly different in the two fatigue tests: the fatigue index was (36.2 ± 5.4)% <em>vs.</em> (38.6 ± 2.8)%, respectively (p > 0.05). While identical force reduction was present in the two fatigue tests, it would appear that concomitant electrical failure was considerably different. This electromechanical dissociation would suggest that slowing conduction along nerve and muscle membranes did not explain the observed mechanical failure. It is suggested that intracellular processes played a major role in contractile failure during intermittent contractions after muscle disuse. </p> <p> </p> <div> <h2> </h2> </div> |
| title | An Electrophysiological Investigations of the Human Triceps Surae Muscle after a Simulated Microgravity Environment |
| topic | "dry" Water immersion Human triceps surae Isometric intermittent contraction Surface action potential Muscle Fatigue |
| url | https://doi.org/10.5281/zenodo.14911371 |