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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. 2013; 59(2): 71-84


Influence of physical training under conditions of 120-day simulated microgravity on contractile properties and musculo-tendinous stiffness of the triceps surae muscle

Koriak IuA

    State science Ceneter of Russia, Institute of Medical Biological Problems, RAS, Moscow, Russia
DOI: https://doi.org/10.15407/fz59.02.071

Abstract

The effect of a 120-day -5 degrees head-down tilt (HDT) bed rest with countermeasures (physical training) on the mechanical properties of the human triceps surae muscle was studied in four healthy young women aged 28.0. The results showed that the contractile properties of the skeletal muscle studied changed considerably. After HDT without countermeasures the maximal voluntary contraction (MVC) had decreased by 36% (P < 0.05), and the electrically evoked tetanic tension at 150 Hz (P) and isometric twitch contraction (P(t)) had decreased by 24% (P < 0.05) and 12 % (P < 0.05), respectively. Time-to-peak tension (TPT) of the twitch had significantly increased by 14% (P < 0.05), but half-relaxation time (1/2 RT), and total contraction time (TCT) had decreased by 19% (P < 0.05) and 18% (P < 0.05), respectively. The difference between P(o) and MVC expressed as a percentage of P(o) and referred to as force deficiency (P(d)), was also calculated. The P(d) had increased by 40% (P < 0.001). The rate of increase of voluntary contractions calculated according to a relative scale had significantly reduced, but for the electrically evoked contraction no substantial changes were observed. After HDT with countermeasures TPT, 1/2 RT and TCT had decreased by 4%, 7%, 19%, respectively in relation to the control condition. Training had caused a decrease of 3% (P > 0.05) in MVC, and P(t) and in P(o) of 14%, and of 9% (P > 0.05), respectively. The Pd had decreased significantly by 10% (P < 0.05). The rate of increase of electrically evoked tetanic tension did not change significantly during HDT with countermeasures but the rate of increase in isometric voluntary tension development was increased. Physical training provided a reserve of neuromuscular function, which attenuated the effect of bed rest. The experimental findings indicated that neural as well as muscle adaptation occurred in response to HDT with countermeasures.

Keywords: head-down bed rest; triceps surae muscle; physicaltraining; contraction properties; musculo-tendinous stiffness;electromechanical delay

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