Evaluating High-Intensity Interval-Training Validity Using Critical Power in Rowing

Purpose : This study evaluated the effectiveness of the 3-minute all-out test (3MT) in rowing for determining critical power (CP) and work capacity above CP ( W ′) to prescribe high-intensity interval training. Methods : Thirteen physically active adults (7 female) participated. They completed a graded exercise test to determine maximal oxygen consumption ( ) and heart rate (HR) and a 3MT to estimate CP and W ′. Two high-intensity interval-training sessions were prescribed based on CP and W ′ values: 4 × 3-minute intervals at 60% W ′ depletion and 3 × 5-minute intervals at 80% W ′ depletion. Repeated-measures analysis of variance assessed differences in end-exercise and HR across intervals. Results : Participants’ mean age, height, and body mass were 32.5 (7) years, 172.9 (5.5) cm, and 83.0 (19.2) kg. Peak and HR values from the graded exercise test were 47.9 (12.2) mL·kg −1 ·min −1 and 181.7 (8.2) beats·min –1 . CP and W ′ values from the 3MT were 166.2 (35.16) W and 16.3 (8.4) kJ. Significant differences between males and females were found in fat-free mass, estimated 1-repetition-maximum leg press, and W ′. No significant main effects were observed for end-interval values for and HR between both intervals, except for HR in the 4 × 3-minute interval. Significant interval effects on completed power were found in both sessions. Significant correlations were observed between estimated 1-repetition-maximum leg press, CP, W ′, fat-free mass, and graded-exercise-test peak power. Conclusions : The 3MT effectively determined CP and W ′, supporting the utility of the CP model for high-intensity interval training in rowing and highlighting the need for individual training strategies.