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Abstract <p>To reduce the duration of the recovery period after spaceexpeditions, as well as high-quality effective therapy of conditionsassociated with physical inactivity on Earth, it is necessary tounderstand the mechanisms of adaptive rearrangements of morphofunctionallydifferent motor systems at all levels of their organization. Theaim of the study was to assess the functional condition of the centraland peripheral links of the neuromotor apparatus of the rat calfmuscles under conditions of readaptation to the action of the supportreaction force and axial loads after simulated gravitational unloading.The study used electromyographic testing methods and also determinedthe wet and dry weight of the soleus and tibialis anterior muscles.The experimental results showed significant changes in the parametersof reflex and motor responses of the studied muscles. The recordeddata indicated a decrease in the reflex excitability of the spinalmotor centers on the 1st day of the readaptation period and itsincrease at the following stages: on the 3rd day for the soleusmuscle, on the 7th day for the tibialis anterior muscle. Significanttransformations of the functional condition and peripheral partsof the motor systems were also observed, as well as a gradual recoveryof muscle weight. More pronounced changes and a longer recoveryperiod were recorded during testing of the slow posterotonic soleusmuscle. The information obtained can be useful for developing newand improving existing strategies for motor rehabilitation.</p>

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The Functional Condition of the Neuromotor Apparatus of the Calf Muscles in Rats during the Recovery of Motor Activity after Simulated Gravitational Unloading

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • A. O. Fedianin,
  • M. E. Baltin,
  • D. E. Sabirova,
  • T. V. Baltina,
  • N. G. Iskakov,
  • A. A. Eremeev

摘要

Abstract

To reduce the duration of the recovery period after spaceexpeditions, as well as high-quality effective therapy of conditionsassociated with physical inactivity on Earth, it is necessary tounderstand the mechanisms of adaptive rearrangements of morphofunctionallydifferent motor systems at all levels of their organization. Theaim of the study was to assess the functional condition of the centraland peripheral links of the neuromotor apparatus of the rat calfmuscles under conditions of readaptation to the action of the supportreaction force and axial loads after simulated gravitational unloading.The study used electromyographic testing methods and also determinedthe wet and dry weight of the soleus and tibialis anterior muscles.The experimental results showed significant changes in the parametersof reflex and motor responses of the studied muscles. The recordeddata indicated a decrease in the reflex excitability of the spinalmotor centers on the 1st day of the readaptation period and itsincrease at the following stages: on the 3rd day for the soleusmuscle, on the 7th day for the tibialis anterior muscle. Significanttransformations of the functional condition and peripheral partsof the motor systems were also observed, as well as a gradual recoveryof muscle weight. More pronounced changes and a longer recoveryperiod were recorded during testing of the slow posterotonic soleusmuscle. The information obtained can be useful for developing newand improving existing strategies for motor rehabilitation.