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J Appl Physiol 84: 1976-1981, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 6, 1976-1981, June 1998

Leg intramuscular pressures during locomotion in humans

Richard E. Ballard1,2, Donald E. Watenpaugh1, Gregory A. Breit1, Gita Murthy1, Daniel C. Holley2, and Alan R. Hargens1

1 Gravitational Research Branch, National Aeronautics and Space Adminstration-Ames Research Center, Moffett Field, 94035-1000; and 2 Department of Biological Sciences, San Jose State University, San Jose, California 95192-0100

To 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.

muscle force; soleus; tibialis anterior; walking; running


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