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ISSN 2522-9028 (Print)
ISSN 2522-9036 (Online)
DOI: https://doi.org/10.15407/fz

Fiziologichnyi Zhurnal

is a scientific journal issued by the

Bogomoletz Institute of Physiology
National Academy of Sciences of Ukraine

Editor-in-chief: V.F. Sagach

The journal was founded in 1955 as
1955 – 1977 "Fiziolohichnyi zhurnal" (ISSN 0015 – 3311)
1978 – 1993 "Fiziologicheskii zhurnal" (ISSN 0201 – 8489)
1994 – 2016 "Fiziolohichnyi zhurnal" (ISSN 0201 – 8489)
2017 – "Fiziolohichnyi zhurnal" (ISSN 2522-9028)

Fiziol. Zh. 2010; 56(5): 62-76


Neuromuscular responses of the triceps surae muscle to prolonged passive stretch of the foot extensor muscles under conditions of simulated microgravity

Koriak IuA.

    The State Science Center Institute of Medical and Biological Problems, Russian Academy of Sciences, Russia
DOI: https://doi.org/10.15407/fz56.05.062

Abstract

The effect of a 60-day 6° head-down tilt (HDT) of bed rest with and without countermeasures on the mechanical properties of human the triceps surae muscle was studied in 12 healthy young men subjects. One group (n=6; mean age 30.8 ± 3.1 years) underwent a 60-day HDT and a second group (n=6; mean age 30.5 ± 1.9 years) underwent HDT with counter-measures (long-term passive stretching). The results showed that the contractile properties of skeletal muscle change considerably. After HDT without countermeasures the maximal voluntary contraction (MVC) declined by 33.5 % (P < 0.05), the electrically evoked tetanic tension at 150 Hz (Po) and isometric twitch contraction (P) reduced by 18.0 % (P < 0.02) and 17.3 % (P < 0.05), respectively. Time-to peak tension (TPT) of the twitch increased by 3.4 %, but half-relaxation time (1/2 RT) decreased by 7.2 %, and total contraction time (TCT) increased not significantly. The difference between Po and MVC expressed as a percentage of P and referred to as force deficiency (P), has also been calculated. The Pd increased by 61 % (P < 0.001). The rate of rise of voluntary contractions calculated according to an relative scale significantly reduced, but the electrically evoked contraction no substantial changes were observed. After HDT with long-term passive stretching caused decrease by 43.0 % (P < 0.05) in MVC, and P, and in P by 17.0 %, and by19.4 % (P < 0.05), respectively. The Pd increased significantly by 100 % (P < 0.001). TPT, and 1/2 RT not change significantly, and TCT of the twitch increased by 6.5 %, respectively in relation to the control condition. The rate of rise of electrically evoked tetanic tension did not change significantly during HDT with countermeasures but the rate of rise in on isometric voluntary tension development were decreased. These data indicate that prolonged passive stretch­ing of a single muscle decreases voluntary strength. Thus, the received data specify, that the long passive stretching of a muscle does not find out preventive facilitate contractile prop­erties of the muscular device from negative influences of me­chanical unloading. This study presents evidence that pro­longed passive muscle stretching can lead to some modifica­tion of contraction material behavior. In addition, altered mate­rial properties seem to affect proprioceptive feedback and, therefore, the motor unit activation in proportion to the contractile failure.

Keywords: human triceps surae muscle – bed rest musclestretching – contractile properties – voluntary activation elec-trically induced contraction – weightlessness countermeasures.

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