Functioning the rat sceletal muscles in conditions of zero gravity modeling

In conditions of simultaneous registration in vivo curves of isometric reduction of 2 muscles in a rat - fast (leg calf) and slow (soleus) estimated influence of legs orthostatic unloading on peak-time parameters of reduction. Have taped, that in these conditions force was enlarged and time of single muscular reduction decreased, and at leg calf muscles this tendency was kept down to final observation on 5 week term of a hanging. At soleus muscles, since 4-th week, the incomplete reversion of force and time of reduction was observed. At increasing the time of hanging down to 3 weeks the increase of frequency of tetanic reduc-tions coalescence at both muscles was observed. The further increasing the time of hanging was not ac-companied by change of coalescence frequency of these muscles. At comparison of curve tetanic reduc-tions at intact and at the hung out animals it was observed, alongside with initial increasing the amplitude of summarized reductions, characteristic pessimal picture of recession that correlates with decrease of time at single reduction and allows to explain, how at increasing the force of single muscular reduction the general picture of muscular delicacy can be observed. The analysis of tetanuses caused by indirect and direct borings, has shown, that in case of a hanging tetanuses it is possible to lead to optimum kind at immediate stimulation of a sceletal muscle that speaks about neuronal component of effects observable at orthostatic unloading. Obtained data add a complex of knowledge about the processes occuring at condi-tions, close to zero gravity.