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01-05-2020 | Original Article

Repeated sprint in hypoxia as a time-metabolic efficient strategy to improve physical fitness of obese women

Authors: Alba Camacho-Cardenosa, Marta Camacho-Cardenosa, Javier Brazo-Sayavera, Rafael Timón, Adrián González-Custodio, Guillermo Olcina

Published in: European Journal of Applied Physiology | Issue 5/2020

Abstract

Purpose

To investigate the training and detraining effects of two different hypoxic high-intensity protocols on cardiorespiratory fitness, maximal fat oxidation and energy contribution in obese women.

Methods

82 obese women completed a 12-week training of: (1) interval training in hypoxia (IHT; n = 19; 3 min at 90%W_max: 3 min at 55–65%W_max; FiO₂ = 17.2%), (2) interval training in normoxia (INT; n = 20; 3 min at 90%W_max: 3 min at 55–65%W_max), (3) repeated sprint training in hypoxia (RSH; n = 22; 30 s at 130%W_max: 3 min at 55–65%W_max; FiO₂ = 17.2%), and (4) repeated sprint training in normoxia (RSN; n = 21; 30 s at 130%W_max: 3 min at 55–65%W_max). VO_2max, workload, time to exhaustion and heart rate were assessed at baseline, after completion of 36 training sessions over 12 weeks and after 4 weeks of detraining.

Results

Hypoxic training (IHT and RSH) showed a significant positive effect on absolute (p < 0.001) and relative maximal oxygen uptake (p < 0.001) as well as VT2 (%VO_2max; p < 0.001). Both IHT and RSH showed significantly higher values of absolute VO_2max (IHT: + 26.63%; RSH: + 19.79%) and relative VO_2max (IHT: + 27.95%; RSH: + 19.94%) between baseline and post-exercise (p < 0.001). VO_2max (IHT: + 21.74%; RSH: + 17.65%) and relative VO_2max (IHT: + 23.53%; RSH: + 17.15%) remained significantly higher after detraining in IHT and RSH (p < 0.001).

Conclusion

A larger improvement in cardiorespiratory fitness has been observed after high-intensity interval training under normobaric hypoxia. As interval training or repeated sprint training did not show a significant effect, RSH might provide a time-metabolic effective strategy in this population.

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Title: Repeated sprint in hypoxia as a time-metabolic efficient strategy to improve physical fitness of obese women
Authors: Alba Camacho-Cardenosa
Marta Camacho-Cardenosa
Javier Brazo-Sayavera
Rafael Timón
Adrián González-Custodio
Guillermo Olcina
Publication date: 01-05-2020
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 5/2020
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-020-04344-2

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Repeated sprint in hypoxia as a time-metabolic efficient strategy to improve physical fitness of obese women

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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