NDLI: Ontogenetic model of gravity and weightlessness: Theoretical and applied aspects

Content Provider	Springer Nature Link
Author	Meigal, A. Yu.
Copyright Year	2011
Abstract	The review discusses the previously postulated natural adaptive motor strategies evolving during the human life span and their link to sensory conditions, among which gravity and temperature play the predominant role. The initial FM strategy based on the dominance of fast-twitch motor fibers is characteristic of intrauterine immersion in the amniotic fluid and microgravity in a real space flight (G∼0). According to this paradigm, the process of parturition when the newborn experiences a sensory attack of Earth’s gravity (1G) and a lower temperature can be considered equivalent to an astronaut’s landing. This postnatal GE strategy is opposite to the FM strategy, because it decreases the motor unit (MU) firing and causes the activity of muscle fibers to slow down. The next SJ strategy appears in normal aging, which is expressed in further dominance of slow-twitch MU and discreet motor control, thus stimulating hypergravity (>1G). Cooling evokes similar adaptive reactions. The synergy of sensory inputs acting upon the motor system within the strategies suggests the possibility of their mutual substitution. For example, a moderate sensory cold attack may serve as a partial surrogate of gravity (∼0.2G), which could be used as a countermeasure for the unfavorable effects of a long-term space flight.
Starting Page	755
Ending Page	762
Page Count	8
File Format	PDF
ISSN	03621197
Journal	Human Physiology
Volume Number	37
Issue Number	6
e-ISSN	16083164
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-11-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Life Sciences Human Physiology Biomedicine general
Content Type	Text
Resource Type	Book Review
Subject	Physiology Physiology (medical)

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