ISSN:
0897-3806
Keywords:
wrist position influence
;
fast isometric contractions
;
motor control
;
human hand muscles
;
Life and Medical Sciences
;
Miscellaneous Medical
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
The influence of wrist position on the motor control of intrinsic and extrinsic hand muscles during the performance of fast isometric precision-grip contractions was evaluated. Ten male and female subjects, aged 17-28 years, attempted to produce accurately 75%, 50%, 25%, and 10% of a predetermined maximum criterion force level with the wrist in the flexed, functional, and extended positions. Feedback on the accuracy of each contraction was provided by a visual error display after each trial. Trials selected for analysis fell within ± 5% error of the required force level. Surface electromyograms were recorded from the first dorsal interosseous, adductor pollicis, abductor pollicis brevis, common flexor muscles and the extensor digitorum. Wrist position was shown to influence significantly the integrated electromyographic values representing the activity of the first dorsal interossous but not the adductor pollicis. Significant alterations in the onset time of the antagonist extensor digitorum were also detected. On the basis of the these results we suggest that the intrinsic muscles of the hand can be classified as either wrist position dependent or independent.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/ca.980020104
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