A Study on the Activation of Forearm Muscles during Gripping by Handle Thickness

[Purpose] This study examined the muscle activation when subjects gripped a handle with a circumference equal to 0%, 25%, 50%, 75%, or 100% of their hand length to determine the size that can be gripped most stably relative to the hand length. [Subjects and Methods] The muscle activation of 34 subje...

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Bibliographic Details
Published in:Journal of Physical Therapy Science 2011, Vol.23(4), pp.549-551
Main Authors: Lee, Sangyeol, Shim, Jemyung, Park, Minchull
Format: Article
Language:English
Subjects:
Grip
Muscle activation
Thickness of a handle
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Summary:[Purpose] This study examined the muscle activation when subjects gripped a handle with a circumference equal to 0%, 25%, 50%, 75%, or 100% of their hand length to determine the size that can be gripped most stably relative to the hand length. [Subjects and Methods] The muscle activation of 34 subjects was measured using electromyography. To make a cylinder proportionate to the hand length, multiple pencils were combined and the circumference was measured with a tape measure. The cylinders were made with circumferences of 0 %, 25 %, 50 %, 75 %, and 100 % of the hand length. [Results] The largest muscle activation was observed at handle circumferences of 50% and 75% of the hand length in the wrist extensor bundle and at 75% of the hand length in the flexor digitorum superficialis. [Conclusion] Therefore, circumferences of the middle range of hand length seems to be most appropriate for hammer handles and handles with high resistance which require large strength at industrial sites.
ISSN:0915-5287
2187-5626
DOI:10.1589/jpts.23.549