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[Mechanisms of impairment of precise movements during long-term hypokinesia]
I B Kozlovskaia1, A V Kirenskaia
1Institute of Medical-Biological Problems, Russian Acad. Sci., Russia, 123007, Moscow, 76a Khoroshevskoe Shosse.
Abstract:
Antiorthostaic hypokinesia (AOHK) was found to entail a considerable diminishing of the control system's precision abilities. In the first 14-30 days of the AOHK (the 1st stage), variability of interimpike intervals (ISI) was sharply increased as well as the degree of synchronisation of the motor units' (MU) activity; starting from the 30th day (the 2nd stage), a regular diminishing of the ISI occurred and the MU synchronisation disappeared. The data obtained suggest the different nature of the precision disorders during the 1st and the 2nd stages of the AOHK: a reflex responses to support unloading and the atrophic processes in the muscles, respectively.
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