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European Journal of Applied Physiology

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01-04-2018 | Original Article

High-intensity interval training in hypoxia does not affect muscle HIF responses to acute hypoxia in humans

Authors: Stefan De Smet, Gommaar D’Hulst, Chiel Poffé, Ruud Van Thienen, Emanuele Berardi, Peter Hespel

Published in: European Journal of Applied Physiology | Issue 4/2018

Abstract

Purpose

The myocellular response to hypoxia is primarily regulated by hypoxia-inducible factors (HIFs). HIFs thus conceivably are implicated in muscular adaptation to altitude training. Therefore, we investigated the effect of hypoxic versus normoxic training during a period of prolonged hypoxia (‘living high’) on muscle HIF activation during acute ischaemia.

Methods

Ten young male volunteers lived in normobaric hypoxia for 5 weeks (5 days per week, ~ 15.5 h per day, F_iO₂: 16.4–14.0%). One leg was trained in hypoxia (TR_HYP, 12.3% F_iO₂) whilst the other leg was trained in normoxia (TR_NOR, 20.9% F_iO₂). Training sessions (3 per week) consisted of intermittent unilateral knee extensions at 20–25% of the 1-repetition maximum. Before and after the intervention, a 10-min arterial occlusion and reperfusion of the leg was performed. Muscle oxygenation status was continuously measured by near-infrared spectroscopy. Biopsies were taken from m. vastus lateralis before and at the end of the occlusion.

Results

Irrespective of training, occlusion elevated the fraction of HIF-1α expressing myonuclei from ~ 54 to ~ 64% (P < 0.05). However, neither muscle HIF-1α or HIF-2α protein abundance, nor the expression of HIF-1α or downstream targets selected increased in any experimental condition. Training in both TR_NOR and TR_HYP raised muscular oxygen extraction rate upon occlusion by ~ 30%, whilst muscle hyperperfusion immediately following the occlusion increased by ~ 25% in either group (P < 0.05).

Conclusion

Ten minutes of arterial occlusion increased HIF-1α-expressing myonuclei. However, neither normoxic nor hypoxic training during ‘living high’ altered muscle HIF translocation, stabilisation, or transcription in response to acute hypoxia induced by arterial occlusion.

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Title: High-intensity interval training in hypoxia does not affect muscle HIF responses to acute hypoxia in humans
Authors: Stefan De Smet
Gommaar D’Hulst
Chiel Poffé
Ruud Van Thienen
Emanuele Berardi
Peter Hespel
Publication date: 01-04-2018
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 4/2018
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-018-3820-4

At a glance: The STEP trials

Springer Medicine

High-intensity interval training in hypoxia does not affect muscle HIF responses to acute hypoxia in humans

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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