[Variations in circulating levels of prolactin and growth hormone during physical exercise in man: influence of the intensity of the workout].

In trained subjects, circulating PRL and GH increase significantly after a 20 minutes exercise on ergometer bicycle performed either at submaximal or maximal intensity. The magnitude of PRL response appeared to be similar for both kinds of exercise, but the increase in GH level is higher after maximal exercise than after submaximal one.