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EFFECT OF INCREASED AND DIMINISHED FUNCTIONAL LOADING WITH PHYSICAL WORK ON THE REPRODUCTIVE FUNCTION OF RATS: PHYSICAL WORK, HYPODYNAMICS AND REPRODUCTION

Summary.: A total of 150 Wistar albino male and female rats were divided into three groups: (1) exercised by running (treadmill), (2) physiologically immobilized, and (3) controls. Following 108 days of immobilization, nine colonies were formed, each colony consisting of one male rat with four females. The combinations were: trained male with trained females, trained male with immobilized females and trained male with control females. The same three combinations were arranged with immobilized and with control males. The rats were 6 months old at the time of forming the colonies. The results showed that the trained rats were in the best, and the immobilized in the poorest breeding condition. Whereas immobilized male and female rats in homogeneous colonies had the lowest fertility, in heterogeneous colonies with active partners (control or trained animal) they showed a high degree of fertility. The active animal, irrespective of sex, succeeded in activating and impregnating its inactive partner. The highest mortality of the progeny was observed in colonies of immobilized animals and the lowest in colonies which included exercising animals.