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Leg intramuscular pressures during locomotion in humansTo assess the usefulness of intramuscular pressure (IMP) measurement for studying muscle function during gait, IMP was recorded in the soleus and tibialis anterior muscles of 10 volunteers during treadmill walking and running by using transducer-tipped catheters. Soleus IMP exhibited single peaks during late-stance phase of walking [181 +/- 69 (SE) mmHg] and running (269 +/- 95 mmHg). Tibialis anterior IMP showed a biphasic response, with the largest peak (90 +/- 15 mmHg during walking and 151 +/- 25 mmHg during running) occurring shortly after heel strike. IMP magnitude increased with gait speed in both muscles. Linear regression of soleus IMP against ankle joint torque obtained by a dynamometer produced linear relationships (n = 2, r = 0.97 for both). Application of these relationships to IMP data yielded estimated peak soleus moment contributions of 0.95-1.65 N . m/kg during walking, and 1.43-2.70 N . m/kg during running. Phasic elevations of IMP during exercise are probably generated by local muscle tissue deformations due to muscle force development. Thus profiles of IMP provide a direct, reproducible index of muscle function during locomotion in humans.
Document ID
20040172670
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ballard, R. E.
(NASA Ames Research Center Moffett Field, CA United States)
Watenpaugh, D. E.
Breit, G. A.
Murthy, G.
Holley, D. C.
Hargens, A. R.
Date Acquired
August 22, 2013
Publication Date
June 1, 1998
Publication Information
Publication: Journal of applied physiology (Bethesda, Md. : 1985)
Volume: 84
Issue: 6
ISSN: 8750-7587
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Clinical Trial
NASA Center ARC
NASA Discipline Cardiopulmonary

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