Journal of Human Sport and Exercise

Effects of high-intensity interval training while using a breathing-restrictive mask compared to intermittent hypobaric hypoxia

Bryanne N. Bellovary, Kelli E. King, Tony P. Nuñez, James J. McCormick, Andrew D. Wells, Kelsey C. Bourbeau, Zachary J. Fennel, Zidong Li, Kelly E. Johnson, Terence Moriarty, Christine M. Mermier

DOI: https://doi.org/10.14198/jhse.2019.144.11

Abstract

Background: Previous studies of the Elevation Training Mask (ETM) describe comparisons between groups using the ETM and controls for effects on aerobic performance. However, comparisons have not been made to intermittent hypoxic training (IHT). Further, how the ETM impacts exercise economy is unknown. Therefore, we sought to determine the effects of training with the ETM compared to IHT on aerobic performance and cycling economy. Methods: Thirty participants were randomized into an ETM, IHT, or control group (n = 10 each). Pre- and post-testing occurred using a ramp VO2max test on a cycle ergometer allowing submaximal power output (PO) measures of economy. Economy was measured using POs of 100, 125, and 150W. High-intensity cycling interval training (HIIT) occurred 2x/week for 30 min/session for six weeks. Sessions were 20 min of HIIT (30s at 100% peak power output (PPO) of pre VO2max, 90s active recovery at 25W, 10 bouts) with a 5-minute warm-up and cool-down. Repeated measures ANOVA was used for statistical analyses. RESULTS: All participants improved VO2max, PPO, and PO at ventilatory threshold 2 pre- to post-training (p < 0.05). Interactions between groups showed that the RER for the IHT group increased at 100W and 125W, and decreased at RERmax pre- to post-training while the ETM group showed the opposite response (p < 0.05). Conclusion: The ETM and IHT groups performed similarly to the control at maximal and submaximal effort following six weeks of training. The IHT group, but not the ETM group, experienced an increased glycolytic energy shift during submaximal exercise.

Keywords

Elevation training mask; Altitude; Cycling economy

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DOI: https://doi.org/10.14198/jhse.2019.144.11





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