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Effects of eight interval training sessions in hypoxia on anaerobic, aerobic, and high intensity work capacity in endurance cyclists


Arezzolo, D and Coffey, VG and Byrne, NM and Doering, TM, Effects of eight interval training sessions in hypoxia on anaerobic, aerobic, and high intensity work capacity in endurance cyclists, High Altitude Medicine and Biology, 21, (4) pp. 370-377. ISSN 1527-0297 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Mary Ann Liebert, Inc.

DOI: doi:10.1089/ham.2020.0066


Aim:This study aimed to determine if eight sessions of supramaximal but steady-state, set duration interval training in hypoxia enhanced measured anaerobic capacity and work performed during high intensity exercise. High Alt Med Biol. 21:370–377, 2020.

Materials and Methods: Eighteen cyclists (O2peak: 57 ± 7 ml·kg−1·min−1) were pair-matched for anaerobic capacity determined by maximal accumulated oxygen deficit (MAOD) and allocated to a 4-week interval training in hypoxia (IHT; FiO2 = 14.7% ± 0.5%, n = 9) or interval training in normoxia (NORM; FiO2 = 20.6% ± 0.3%, n = 9). Cyclists completed twice weekly interval training (8 × 1 minutes: ∼120% O2peak, 5 minutes recovery: ∼50% O2peak) in addition to their habitual training. Before and after the intervention, a constant work rate supramaximal time to fatigue and a graded exercise test were used to determine changes in anaerobic capacity/supramaximal work performed and aerobic capacity/peak aerobic power output, respectively.

Results: No interaction or main effects were observed. Using indirect calorimetry, anaerobic capacity was not significantly different in either group pre- to postintervention using MAOD (IHT: 4% ± 15%; NORM: −5% ± 12%) or gross efficiency methods (IHT: 7% ± 14%; NORM: −2% ± 9%), and VO2peak was unchanged (IHT: 1% ± 6%; NORM: 1% ± 4%). However, within-group analysis shows that supramaximal work performed improved with IHT (14% ± 13%; p = 0.02; d = 0.42) but not NORM (1% ± 22%), and peak aerobic power output increased with IHT (5% ± 7%; p = 0.04; d = 0.32) but not NORM (2% ± 4%).

Conclusion: Steady-state, set duration supramaximal interval training in hypoxia appears to provide a small beneficial effect on work capacity during supramaximal and high intensity exercise.

Item Details

Item Type:Refereed Article
Keywords:altitude, anaerobic capacity, cycling, endurance performance, IHT
Research Division:Health Sciences
Research Group:Sports science and exercise
Research Field:Sports science and exercise not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the health sciences
UTAS Author:Byrne, NM (Professor Nuala Byrne)
ID Code:151338
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Health Sciences
Deposited On:2022-07-27
Last Modified:2022-09-20

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