[Behavior of contractile proteins of rat muscle fibers under microgravity conditions].
Microgravity effects were studied on three muscles: gastrocnemius lateralis, plantaris and diaphragm, after the biocosmos 1514 and 1667 space flights. Results showed a decrease of maximal mechanical activity on both gastrocnemius and plantaris while no modification was observed on diaphragm. Cross-bridge cycling speed was reduced on both gastrocnemius and plantaris. Moreover, a reduced calcium binding affinity appeared in gastrocnemius.
D000818:Animals; D002118:Calcium / Q000494:pharmacology; D003285:Contractile Proteins / Q000502:physiology*; D003964:Diaphragm / Q000502:physiology; D009132:Muscles / Q000187:drug effects / Q000502:physiology*; D009928:Organ Specificity; D051381:Rats; D013026:Space Flight; D014893:Weightlessness
D003285:Contractile Proteins; D002118:Calcium
Comportement des protéines contractiles de fibres musculaires de rats soumis à la microgravité.