Abstract
The review describes and analyzes the available data on the mechanisms that control the structure and functional potential of a postural muscle, which works nearly unceasingly to allow humans and animals to actively exist on the Earth’s surface. Prof. I.B. Kozlovskaya and her students obtained, described, and systematized a great portion of the data. Many interesting facts and observations were documented in other labs and research centers, often under the influence of Kozlovskaya’s ideas. A concept of a tonic system is the most important part of her theoretical legacy. The tonic system is understood as an integral physiological system that includes not only slow muscle fibers and small-size motor neurons, which innervate them, but also brain (up to the striatum and motor cortex inclusively) and sensory mechanisms. A basic conclusion of the review is that gravity-dependent tonic contractile activity of postural muscles, which is controlled by the nervous system and afferent mechanisms, plays a key role in maintaining their structure, signaling pathways, and mechanical properties crucial for their continuous antigravity activity.
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ACKNOWLEDGMENTS
We are grateful to S.A. Tyganov (Laboratory of Myology, Institute of Biomedical Problems) for help in figure preparation.
Funding
This work was supported by the Russian Foundation for Basic Research (project no. 20-34-70 022) and the Program of Basic Research at the Institute of Biomedical Problems.
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Translated by T. Tkacheva
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Shenkman, B.S., Mirzoev, T.M. & Kozlovskaya, I.B. Tonic Activity and Gravitational Control of the Postural Muscle. Hum Physiol 47, 744–756 (2021). https://doi.org/10.1134/S0362119721070100
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DOI: https://doi.org/10.1134/S0362119721070100