The influence of short-term interval exercise on respiratory and circulatory dynamics in pre and post puberty boys

The main aim of the study was to designate the differences in dynamics of physiological reactions in respiratory and circulatory systems, in boys at the age of pre and post puberty, in response to short supramaximal interval exercises. The research was conducted on 20 boys, divided into two groups of ten in each. The primary research group consisted of individuals, about 12 years old (pre puberty boys), whereas in the secondary group – around the age of 16 (post puberty boys). The main part of the research included an interval test, performed on a bicycle ergometer, which consisted of 10 repetitions, lasting 10 s, interrupted with 30 s rest periods (“10 x 10 s effort + 30 s rest”). Exercise power output was Pmax + 40% MAP, at the pedaling rate of 80. rev/min-1. Dynamics in changes of minute ventilation, tidal volume, respiratory frequency and heart rate from every 5 s were analyzed. The dynamics of the respiratory and circulatory variables, during shortterm repeated physical exercises, didn’t indicate differences between pre and post pubertal boys. The range of changes in measured variables decreased with each consecutive repetitions of exercise at identical intensity. The research demonstrated similar dynamics in changes of the minute ventilation and the respiratory frequency – its value was characterized by a very rapid reaction, indicating the greatest changes in the initial 5 seconds of exercise and post exercise recovery.