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Record 1 of 1198
Intramuscular pressure and torque during isometric, concentric and eccentric muscular activity
Author and Affiliation:
Styf, J.(NASA Ames Research Center, Moffett Field, CA United States)
Ballard, R.
Aratow, M.
Crenshaw, A.
Watenpaugh, D.
Hargens, A. R.
Abstract: Intramuscular 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.
Publication Date: Oct 01, 1995
Document ID:
20050000131
(Acquired Jan 06, 2005)
Subject Category: AEROSPACE MEDICINE
Document Type: Journal Article
Publication Information: Scandinavian journal of medicine & science in sports (ISSN 0905-7188); Volume 5; 5; 291-6
Publisher Information: Denmark
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: MUSCULAR FUNCTION; PHYSICAL EXERCISE; SKELETAL MUSCLE; TORQUE; ADULTS; AEROSPACE MEDICINE; BIOASTRONAUTICS; ELECTROMYOGRAPHY; LEG (ANATOMY); MALES
Other Descriptors: EXERCISE/PHYSIOLOGY; MUSCLE CONTRACTION/PHYSIOLOGY; MUSCLE, SKELETAL/PHYSIOLOGY; ADULT; ELECTROMYOGRAPHY; HUMAN; LEG/PHYSIOLOGY; MALE; MIDDLE AGED; PRESSURE; SUPPORT, NON-U.S. GOV'T; SUPPORT, U.S. GOV'T, NON-P.H.S; SUPPORT, U.S. GOV'T, P.H.S; NASA CENTER ARC; NASA DISCIPLINE CARDIOPULMONARY; NASA DISCIPLINE MUSCULOSKELETAL; NASA DISCIPLINE NUMBER 14-10; NASA DISCIPLINE NUMBER 26-10; NASA PROGRAM SPACE PHYSIOLOGY AND COUNTERMEASURES
Availability Source: Other Sources
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