Figure 3. Heart rate data. Peak heart rate was considered as the higher recorded during the last 10 seconds of the swimming bout and the first 10 seconds of the recovery period. Minimal heart rate was the lower heart rate during the rest period. Maximal heart was significantly lower within IN recovery in the 2nd, 3rd, 4th, and 5th swimming bouts. No differences were found when looking at minimal heart rate. *** (p < 0.001) and ** (p < 0.01) when comparing the IN and OUT conditions.