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Changes in energy system contributions to the Wingate anaerobic test in climbers after a high altitude expedition

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Abstract

Purpose

The Wingate anaerobic test measures the maximum anaerobic capacity of the lower limbs. The energy sources of Wingate test are dominated by anaerobic metabolism (~ 80%). Chronic high altitude exposure induces adaptations on skeletal muscle function and metabolism. Therefore, the study aim was to investigate possible changes in the energy system contribution to Wingate test before and after a high-altitude sojourn.

Methods

Seven male climbers performed a Wingate test before and after a 43-day expedition in the Himalaya (23 days above 5.000 m). Mechanical parameters included: peak power (PP), average power (AP), minimum power (MP) and fatigue index (FI). The metabolic equivalents were calculated as aerobic contribution from O2 uptake during the 30-s exercise phase (WVO2), lactic and alactic anaerobic energy sources were determined from net lactate production (WLa) and the fast component of the kinetics of post-exercise oxygen uptake (WPCr), respectively. The total metabolic work (WTOT) was calculated as the sum of the three energy sources.

Results

PP and AP decreased from 7.3 ± 1.1 to 6.7 ± 1.1 W/kg and from 5.9 ± 0.7 to 5.4 ± 0.8 W/kg, respectively, while FI was unchanged. WTOT declined from 103.9 ± 28.7 to 83.8 ± 17.8 kJ. Relative aerobic contribution remained unchanged (19.9 ± 4.8% vs 18.3 ± 2.3%), while anaerobic lactic and alactic contributions decreased from 48.3 ± 11.7 to 43.1 ± 8.9% and increased from 31.8 ± 14.5 to 38.6 ± 7.4%, respectively.

Conclusion

Chronic high altitude exposure induced a reduction in both mechanical and metabolic parameters of Wingate test. The anaerobic alactic relative contribution increased while the anaerobic lactic decreased, leaving unaffected the overall relative anaerobic contribution to Wingate test.

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Abbreviations

AP:

Average power

CI:

Confidence interval

ES:

Cohen’s d effect size

FI:

Fatigue index

[La-]b :

Blood lactate concentration

MP:

Minimum power

p :

Statistical significance for t test

PP:

Peak power

SD:

Standard deviation

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

Oxygen uptake

V thigh :

Muscle-bone thigh volume

WAnT:

Wingate anaerobic test

W La :

Anaerobic lactic contribution

W PCr :

Anaerobic alactic contribution

W VO2 :

Aerobic contribution

W TOT :

Total metabolic work

\(\dot{W}_{{{\text{TOT}}}}\) :

Total metabolic power

References

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Acknowledgements

The authors would like to acknowledge all participants who volunteered to participate in the experiment.

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Authors and Affiliations

Authors

Contributions

CD, GFI, FE conceived and designed research. CD, VV, TP conducted experiments. CD, SL, SR, EC, AVB, FE analyzed data. CD, SR, EL, SS, EC, GC, VV discussed data. CD, GFI, EC, GC, FE wrote the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Christian Doria.

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Conflict of interest

The authors declare that they have no conflict of interest.

Additional information

Communicated by Guido Ferretti.

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Doria, C., Verratti, V., Pietrangelo, T. et al. Changes in energy system contributions to the Wingate anaerobic test in climbers after a high altitude expedition. Eur J Appl Physiol 120, 1629–1636 (2020). https://doi.org/10.1007/s00421-020-04392-8

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  • DOI: https://doi.org/10.1007/s00421-020-04392-8

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