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Intramuscular pressure and torque during isometric, concentric and eccentric muscular activityIntramuscular pressures, electromyography (EMG) and torque generation during isometric, concentric and eccentric maximal isokinetic muscle activity were recorded in 10 healthy volunteers. Pressure and EMG activity were continuously and simultaneously measured side by side in the tibialis anterior and soleus muscles. Ankle joint torque and position were monitored continuously by an isokinetic dynamometer during plantar flexion and dorsiflexion of the foot. The increased force generation during eccentric muscular activity, compared with other muscular activity, was not accompanied by higher intramuscular pressure. Thus, this study demonstrated that eccentric muscular activity generated higher torque values for each increment of intramuscular pressure. Intramuscular pressures during antagonistic co-activation were significantly higher in the tibilis anterior muscle (42-46% of maximal agonistic activity) compared with the soleus muscle (12-29% of maximal agonistic activity) and was largely due to active recruitment of muscle fibers. In summary, eccentric muscular activity creates higher torque values with no additional increase of the intramuscular pressure compared with concentric and isometric muscular activity.
Document ID
20050000131
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Styf, J.
(NASA Ames Research Center Moffett Field, CA United States)
Ballard, R.
Aratow, M.
Crenshaw, A.
Watenpaugh, D.
Hargens, A. R.
Date Acquired
August 22, 2013
Publication Date
October 1, 1995
Publication Information
Publication: Scandinavian journal of medicine & science in sports
Volume: 5
Issue: 5
ISSN: 0905-7188
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program Space Physiology and Countermeasures
NASA Discipline Number 14-10
NASA Discipline Musculoskeletal
NASA Center ARC
NASA Discipline Number 26-10
NASA Discipline Cardiopulmonary

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