Polar precision performance sw5

Players completed an indoor submaximal 5-minute cycling (Keiser, CA, USA), 5-minute recovery test as part of the warm-up before commencing every training session. 9 (link) All players were assessed together at a fixed exercise intensity of 130 W (85 rpm). This intensity was selected to minimize anaerobic energy contribution 25 (link) and to permit a rapid return of heart rate to baseline for short-term HRV measurements. On completion of exercise the players remained seated in silence for 5 minutes. HRV expressed as the square root of the mean of the sum of squares of differences between adjacent normal R-R intervals (rMSSD, CV 28%) 9 (link) and the natural logarithm of the rMSSD (Ln rMSSD, CV 10%) 9 (link) were calculated as previously described 25 (link) using Polar software (Polar Precision Performance SW 5.20, Polar Electro, Kempele, Finland). HRR expressed as the absolute (HRR, CV 14%) 9 (link) and relative (%HRR, CV 10%) 9 (link) change in HR between the final 30 seconds (average) of the 5-minute cycling test and 60 seconds after cessation of exercise were calculated as previously described. 9, (link)16, (link)25 (link)