| The effect of fatigue from exercise on human limb position sense. | |
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MedLine Citation:
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PMID: 20194123 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We have previously shown, in a two-limb position-matching task in human subjects, that exercise of elbow flexors of one arm led the forearm to be perceived as more extended, while exercise of knee extensors of one leg led the lower leg to be perceived as more flexed. These findings led us to propose that exercise disturbs position sense because subjects perceive their exercised muscles as longer than they actually are. In order to obtain further support for this hypothesis, in the first experiment reported here, elbow extensors were exercised, with the prediction that the exercised arm would be perceived as more flexed after exercise. The experiment was carried out under three load conditions, with the exercised arm resting on a support, with it supporting its own weight and with it supporting a load of 10% of its voluntary contraction strength. For each condition, the forearm was perceived as more extended, not more flexed, after exercise. This result was confirmed in a second experiment on elbow flexors. Again, under all three conditions the exercised arm was perceived as more extended. To explore the distribution of the phenomenon, in a third experiment finger flexor muscles were exercised. This had no significant effect on position sense at the elbow. In a fourth experiment, position sense at the knee was measured after knee flexors of one leg were exercised and, as for knee extensors, it led subjects to perceive their exercised leg to be more flexed at the knee than it actually was. Putting all the observations together, it is concluded that while the influences responsible for the effects of exercise may have a peripheral origin, their effect on position sense occurs centrally, perhaps at the level of the sensorimotor cortex. |
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Authors:
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Trevor J Allen; Michael Leung; Uwe Proske |
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Publication Detail:
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Type: Journal Article Date: 2010-03-01 |
Journal Detail:
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Title: The Journal of physiology Volume: 588 ISSN: 1469-7793 ISO Abbreviation: J. Physiol. (Lond.) Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-04-16 Completed Date: 2010-07-29 Revised Date: 2011-07-28 |
Medline Journal Info:
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Nlm Unique ID: 0266262 Medline TA: J Physiol Country: England |
Other Details:
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Languages: eng Pagination: 1369-77 Citation Subset: IM |
Affiliation:
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Department of Physiology, Monash University, Clayton, Victoria, 3800, Australia. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arm
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physiology* Exercise / physiology* Female Fingers / physiology Humans Leg / physiology* Male Motor Cortex / physiology Muscle Contraction / physiology Muscle Fatigue / physiology* Perception / physiology Proprioception / physiology* Young Adult |
| Comments/Corrections | |
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