Fatigue pp 339-350 | Cite as

Intramuscular Pressures for Monitoring Different Tasks and Muscle Conditions

  • O. M. Sejersted
  • A. R. Hargens
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 384)


Intramuscular 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.


Compartment Syndrome Isometric Contraction Eccentric Exercise Apply Physiology Tibialis Anterior Muscle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • O. M. Sejersted
    • 1
  • A. R. Hargens
    • 2
  1. 1.Institute for Experimental Medical Research, Ullevaal HospitalUniversity of OsloOsloNorway
  2. 2.Gravitational Research Branch, Ames Research CenterNASAMoffett FieldUSA

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