2.3.3. Cardiorespiratory Data
The HR was measured and recorded every second during the repeated-sprint exercise using a HR sensor (H2; Polar Electro Oy., Kempele, Finland) and a wireless monitor (RCX5; Polar Electro Oy., Kempele, Finland), and the mean HR was calculated for each exercise set. The HR sensor was attached with an elastic band on the chest, and the wireless monitor was used to observe the HR continuously throughout the exercise. Oxygen consumption (