The effect of hypodynamia during 9, 30, 60 and 90 days on the striated
muscle m. gastrocnemius in Japanese quails was studied. We have found
different developed dystrophic changes of mitochondria, myofibrils an
d sarcotubular system. Changes of the studied tissue caused by hypodyn
amia in the first two groups (9 and 30 days hypodynamy) are the reacti
on to stress and developing situation. Gradually Japanese quails have
come up to the influence of the hypodynamia (60 days hypodynamia). In
the last experimental group deposit changes were observed (90 days hyp
odynamia). In comparison with control group we have found perturbation
s considered as non-specific, short-term and reversible.