title: Functional insufficiency of the neuromuscular system caused by weightlessness and hypokinesia.
abstract: The results of study of the crew members of the spaceships Soyuz are described, and the effects of weightlessness on reflex excitability, muscular tone and muscle contractibility discussed. A certain decrease in postural muscular tone and strength, increase in reflex excitability at rest and increase in bioelectric activity of muscles at work has been found in the cosmonauts after their stay in a weightless environment. The circumference of the lower extremities decreased.
authors.affiliation: Institute of Medical and Biological Problems, Moscow, USSR.
authors.forename: L I
authors.initials: LI
authors.lastname: Kakurin
authors.forename: M A
authors.initials: MA
authors.lastname: Cherepakhin
authors.forename: A S
authors.initials: AS
authors.lastname: Ushakov
authors.forename: Y A
authors.initials: YA
authors.lastname: Senkevich
mesh_terms: D000222:Adaptation, Physiological; D000337:Aerospace Medicine; D006801:Humans; D008297:Male; D009129:Muscle Tonus / Q000502:physiology; D018482:Muscle, Skeletal / Q000033:anatomy & histology / Q000502:physiology* / Q000503:physiopathology; D009133:Muscular Atrophy / Q000503:physiopathology; D012018:Reflex / Q000502:physiology*; D013026:Space Flight; D014893:Weightlessness