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Intramuscular pressure and electromyography as indexes of force during isokinetic exerciseA direct method for measuring force production of specific muscles during dynamic exercise is presently unavailable. Previous studies indicate that both intramuscular pressure (IMP) and electromyography (EMG) correlate linearly with muscle contraction force during isometric exercise. The objective of this study was to compare IMP and EMG as linear assessors of muscle contraction force during dynamic exercise. IMP and surface EMG activity were recorded during concentric and eccentric isokinetic plantarflexion and dorsiflexion of the ankle joint from the tibialis anterior (TA) and soleus (SOL) muscles of nine male volunteers. Ankle torque was measured using a dynamometer, and IMP was measured via catheterization. IMP exhibited better linear correlation than EMG with ankle joint torque during concentric contractions of the SOL and the TA, as well as during eccentric contractions. IMP provides a better index of muscle contraction force than EMG during concentric and eccentric exercise through the entire range of torque. IMP reflects intrinsic mechanical properties of individual muscles, such as length-tension relationships, which EMG is unable to assess.
Document ID
19930065294
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Aratow, M.
(NASA Ames Research Center Moffett Field, CA, United States)
Ballard, R. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Grenshaw, A. G.
(NASA Ames Research Center Moffett Field, CA, United States)
Styf, J.
(NASA Ames Research Center Moffett Field, CA, United States)
Watenpaugh, D. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Kahan, N. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Hargens, A. R.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Publication Information
Publication: Journal of Applied Physiology
Volume: 74
Issue: 6
ISSN: 8750-7587
Subject Category
Aerospace Medicine
Accession Number
93A49291
Funding Number(s)
PROJECT: RTOP 199-26-12-38
PROJECT: RTOP 199-14-12-04
Distribution Limits
Public
Copyright
Other

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