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Intramuscular pressures for monitoring different tasks and muscle conditionsIntramuscular fluid pressure (IMP) can easily be measured in man and animals. It follows the law of Laplace which means that it is determined by the tension of the muscle fibers, the recording depth and by fiber geometry (fiber curvature or pennation angle). Thick, bulging muscles create high IMPs (up to 1000 mmHg) and force transmission to tendons becomes inefficient. High resting or postexercise IMPs are indicative of a compartment syndrome due to muscle swelling within a low-compliance osseofascial boundary. IMP increases linearly with force (torque) independent of the mode or speed of contraction (isometric, eccentric, concentric). IMP is also a much better predictor of muscle force than the EMG signal. During prolonged low-force isometric contractions, cyclic variations in IMP are seen. Since IMP influences muscle blood flow through the muscle pump, autoregulating vascular elements, and compression of the intramuscular vasculature, alterations in IMP have important implications for muscle function.
Document ID
20050000254
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sejersted, O. M.
(Institute for Experimental Medical Research, University of Oslo, Ullevaal Hospital Norway)
Hargens, A. R.
Date Acquired
August 22, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Advances in experimental medicine and biology
Volume: 384
ISSN: 0065-2598
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Musculoskeletal
Review
Review, Tutorial
NASA Center ARC
NASA Program Space Physiology and Countermeasures
NASA Discipline Cardiopulmonary
NASA Discipline Number 14-10
NASA Discipline Number 26-10

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