Abstract: Thirty Wistar male rats were randomly divided into 3 groups : quiet group (A) ;exhaustive exercise group (B) ;training and exhaustive exercise group (C).Ca²⁺-ATPase activity in mitochondria of different types of muscle were determined .The results showed : 1) Ca²⁺-ATPase activity in mitochondria of the white muscle was higher than that of the red muscle at rest ;2) After exhaustive exercise,Ca²⁺-ATPase activity in mitochondria of the white muscle decreased but that of the red muscle incrased;3) The change of Ca²⁺-ATPase activity in mitochondria of the white muscle was larger through five weeks training .The above data suggest that the progressively increase load training takes positive effect only for the white muscle.

Key words: training, exhaustive exercise, rat, Ca²⁺-ATPase