[Work capacity of skeletal muscles and energetics of muscular work during adaptation to cold]

After the cold adaptation muscle contraction and the working capacity decreased. However, the muscles of the adapted to cold rats are able to save the initial power for a longer time. The muscular work of adapted to cold rats involves a greater expenditure of energy as compared with the control rats. Changes of the working capacity of skeletal muscles in control rats after noradrenalin administration are similar to those occurring in adapted to cold rats.