Change in V O 2max and time trial performance in response to high-intensity interval training prescribed using ventilatory threshold

摘要

Completion of high-intensity interval training (HIIT) leads to significant increases in maximal oxygen uptake ( V O~(2max)) and oxidative capacity. However, individual responses to HIIT have been identified as approximately 20–40% of individuals show no change in V O~(2max), which may be due to the relatively homogeneous approach to implementing HIIT. Purpose: This study tested the effects of HIIT prescribed using ventilatory threshold (VT) on changes in V O~(2max)and cycling performance. Methods: Fourteen active men and women (age and V O~(2max)?=?27?±?8?year and 38?±?4?mL/kg/min) underwent nine sessions of HIIT, and 14 additional men and women (age and V O~(2max)?=?22?±?3?year and 40?±?5?mL/kg/min) served as controls. Training was performed on a cycle ergometer at a work rate equal to 130%VT and consisted of eight to ten 1?min bouts interspersed with 75?s of recovery. At baseline and post-testing, they completed progressive cycling to exhaustion to determine V O~(2max), and on a separate day, a 5 mile cycling time trial. Results: Compared to the control group, HIIT led to significant increases in V O~(2max)(6%, p ?=?0.007), cycling performance (2.5%, p ?=?0.003), and absolute VT (9?W, p ?=?0.005). However, only 57% of participants revealed meaningful increases in V O~(2max)and cycling performance in response to training, and two showed no change in either outcome. Conclusions: A greater volume of HIIT may be needed to maximize the training response for all individuals.