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Augmented muscle glycogen utilization following a single session of sprint training in hypoxia

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

This study determined the effect of a single session of sprint interval training in hypoxia on muscle glycogen content among athletes.

Methods

Ten male college track and field sprinters (mean ± standard error of the mean: age, 21.1 ± 0.2 years; height, 177 ± 2 cm; body weight, 67 ± 2 kg) performed two exercise trials under either hypoxia [HYPO; fraction of inspired oxygen (FiO2), 14.5%] or normoxia (NOR: FiO2, 20.9%). The exercise consisted of 3 × 30 s maximal cycle sprints with 8-min rest periods between sets. Before and immediately after the exercise, the muscle glycogen content was measured using carbon magnetic resonance spectroscopy in vastus lateralis and vastus intermedius muscles. Moreover, power output, blood lactate concentrations, metabolic responses (respiratory oxygen uptake and carbon dioxide output), and muscle oxygenation were evaluated.

Results

Exercise significantly decreased muscle glycogen content in both trials (interaction, P = 0.03; main effect for time, P < 0.01). Relative changes in muscle glycogen content following exercise were significantly higher in the HYPO trial (− 43.5 ± 0.4%) than in the NOR trial (− 34.0 ± 0.3%; P < 0.01). The mean power output did not significantly differ between the two trials (P = 0.80). The blood lactate concentration after exercise was not significantly different between trials (P = 0.31).

Conclusion

A single session of sprint interval training (3 × 30 s sprints) in hypoxia caused a greater decrease in muscle glycogen content compared with the same exercise under normoxia without interfering with the power output.

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Abbreviations

AMPK:

AMP-activated protein kinase

13C-MRS:

Carbon magnetic resonance spectroscopy

FiO2 :

Fraction of inspired oxygen

GLUT4:

Glucose transporter 4

HR:

Heart rate

HYPO:

Maximal sprint exercise in hypoxia

NOR:

Maximal sprint exercise in normoxia

PFK:

Phosphofructokinase

RER:

Respiratory exchange ratio

RPE:

Rating of perceived exertion

RSH:

Repeated sprint training in hypoxia

SIH:

Sprint interval training in hypoxia

SIT:

Sprint interval training in normoxia

SmO2 :

Percent oxygen saturation of hemoglobin and myoglobin in muscle tissue

SpO2 :

Percent oxygen saturation of hemoglobin in arterial blood

\(\dot{V}{\text{CO}}_{2}\) :

Rate of carbon dioxide output

\(\dot{V}{\text{E}}\) :

Rate of minute ventilation

\(\dot{V}{\text{O}}_{2}\) :

Rate of oxygen uptake

References

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Acknowledgements

The authors thank all subjects who conducted the intensive exercise in the present study. The present study was supported by a research Grant from Japan Society for the Promotion of Science.

Funding

The present study was funded by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science.

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Authors and Affiliations

Authors

Contributions

NK, KG and YS contributed to experimental design. NK, FT, AI, HO, HT and YS performed data collection. NK performed the statistical analysis, interpretation of data and drafting of the paper. KG revised the work and final approval of the manuscript. All co-authors read and approved the final manuscript.

Corresponding author

Correspondence to Kazushige Goto.

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Conflict of interest

The authors have no conflict of interest to declare.

Additional information

Communicated by Michael Lindinger.

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Kasai, N., Tanji, F., Ishibashi, A. et al. Augmented muscle glycogen utilization following a single session of sprint training in hypoxia. Eur J Appl Physiol 121, 2981–2991 (2021). https://doi.org/10.1007/s00421-021-04748-8

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  • DOI: https://doi.org/10.1007/s00421-021-04748-8

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