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Muscle blood flow during isometric activity and its relation to muscle fatigue

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European Journal of Applied Physiology and Occupational Physiology Aims and scope Submit manuscript

Summary

The effect of isometric exercise on blood flow, blood pressure, intramuscular pressure as well as lactate and potassium efflux from exercising muscle was examined. The contractions performed were continuous or intermittent (5 s on, 5 s off) and varied between 5% and 50% maximal voluntary contraction (MVC). A knee-extensor and a hand-grip protocol were used. Evidence is presented that blood flow through the muscle is sufficient during low-level sustained contractions (<10% MVC). Despite this muscle fatigue occurs during prolonged contractions. One mechanism for this fatigue may be the disturbance of the potassium homeostasis. Such changes may also play a role in the development of fatigue during intermittent isometric contractions and even more so in the recovery from such exercise. In addition the role of impaired transport of substances within the muscle, due to longlasting daily oedema formation, is discussed in relation to fatigue in highly repetitive, monotonous jobs.

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Sjøgaard, G., Savard, G. & Juel, C. Muscle blood flow during isometric activity and its relation to muscle fatigue. Europ. J. Appl. Physiol. 57, 327–335 (1988). https://doi.org/10.1007/BF00635992

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