Effects of Endurance Training on Cardio-Respiratory functions in the Period of Development. (Part 1)

Abstract

In orders to know the effects of endurancetraining (for middle and longdistance running events) on the cardio-respiratory functions in the period of development, the oxygen intake, heart rate and other parameters of that function were measured from April to October on 18 subjects who were all beginners in endurance training, aged 12, 15 and 18 years, and untrained boys as control. The results were as follows: 1) Increase in body weight was restrained by the endurance training. 2) Endurance running time were increased in the training group, but unchanged in non- training group. 3) We could not find the difference of maximal heart rate between training group and non-training group. But the maximal heart rate of the older subjects were some what lower than that of the younger ones. 4) In oxygen pulse, the training group showed superior values than the non-training group, and higher in the older subjects than in the younger ones. 5) Both training and non-training groups showed increase in the capacity of oxygen intake according to the increase in age. The oxygen intake per kilogram of body weight was unchanged in the training group, but decreased in the non-training group with the increase in age.