[Effect of 7-day immersion hyperkinesia on the response-strength properties of human skeletal muscles].
By isokinetic dynamometry the effect of 7-day water immersion on the velocity-strength properties of the triceps and anterior tibial muscles was investigated. The exposure decreased significantly the maximum strength of the leg extensors (about 30%); this was seen in a large velocity range (60-180 degrees/s) and during static movements. The decline of the contractile properties of the extensors was also manifested in a significant increase of the ratio of bioelectrical and mechanical effects of contraction which was greatly pronounced during high-load (60 degrees/s) and isometric regimens. The strength properties of the tibial muscle diminished only during isometric contractions. The high rate with which the above changes developed and returned to normal after the exposure (3-5 days) are indicative of their reflex nature and association with mechanisms of tonic disorders due to the lack of support loading.
D000328:Adult; D004576:Electromyography; D006112:Gravitation; D006801:Humans; D007101:Immersion / Q000503:physiopathology*; D007537:Isometric Contraction; D008297:Male; D009119:Muscle Contraction; D009132:Muscles / Q000503:physiopathology*; D013997:Time Factors; D014893:Weightlessness
Vliianie 7-sutochnoĭ opornoĭ razgruzki na skorostno-silovye svoĭstva skeletnykh myshts cheloveka.