title: [Effect of weightlessness and hypokinesia on the velocity-strength properties of human muscles].
abstract: Before and after exposure to short- and long-term microgravity and prolonged bed rest velocity and strength parameters of leg muscles were measured by isokinetic dynamometry. It was found that long-term exposure to microgravity produced a more distinct decline of muscle strength than short-term exposure. At the same time prolonged bed rest led to greater strength losses than microgravity of comparable duration. After long-term flights individual variability of changes was twice as high as after prolonged bed rest. A comparable analysis of the above exposures demonstrated that the changes observed after long-duration exposures were associated with atrophic changes due to disuse while those seen after short-term effects were induced, as shown previously, by reflex tonic shifts related to support unloading.
mesh_terms: D001510:Bed Rest; D001696:Biomechanical Phenomena; D006801:Humans; D007717:Knee / Q000502:physiology; D009132:Muscles / Q000502:physiology*; D005082:Physical Exertion; D013026:Space Flight; D013848:Thigh; D013997:Time Factors; D014893:Weightlessness
vernacular_title: Vliianie nevesomosti i gipokinezii na skorostno-silovye svoĭstva myshts cheloveka.