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Published in: European Journal of Applied Physiology 5/2017

01-05-2017 | Original Article

The relationship between oxygen uptake kinetics and neuromuscular fatigue in high-intensity cycling exercise

Authors: John Temesi, Felipe Mattioni Maturana, Arthur Peyrard, Tatiane Piucco, Juan M. Murias, Guillaume Y. Millet

Published in: European Journal of Applied Physiology | Issue 5/2017

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Abstract

Purpose

In theory, a slow oxygen uptake (\(\dot VO_2\)) kinetics leads to a greater accumulation of anaerobic by-products, which can, in turn, induce more neuromuscular fatigue. However, the existence of this relationship has never been tested.

Methods

After two sessions to measure peak \(\dot VO_2\), peak power output (POpeak), and \(\dot VO_2\) kinetics responses in the unfatigued state (τ \(\dot VO_2\) MOD), 10 healthy young adults performed a 6-min cycling bout at 80% POpeak (INT6-min). \(\dot VO_2\) kinetics responses were also measured during INT6-min. Neuromuscular fatigue was measured isometrically pre- and post-INT6-min (immediately post- and 15-s post-INT6-min) with an innovative cycle ergometer.

Results

Maximal voluntary contraction (MVC) force, high-frequency doublet amplitude, and the ratio of low- to high-frequency doublet amplitudes decreased by 34 ± 7, 43 ± 11, and 31 ± 13%, respectively (all P < 0.01). A significant Spearman’s rank correlation was observed between the change in low-frequency doublet force (ΔDb10) immediately after INT6-min and both τ \(\dot VO_2\) MOD and τ \(\dot VO_2\) INT6-min (ρ = −0.68 and ρ = −0.67, both P < 0.05). When considering the largest responses from the two neuromuscular evaluations post-INT6-min, significant correlations were also found between τ \(\dot VO_2\) MOD and ΔDb10 (ρ = −0.74; P < 0.05) and between τ\(\dot VO_2\) INT6-min and both ΔDb10 and low-frequency fatigue (ρ = −0.70 and ρ = −0.66; both P < 0.05).

Conclusion

The present results suggest that subjects with slow \(\dot VO_2\) kinetics experience more peripheral fatigue, in particular more excitation–contraction coupling failure, likely due to a greater accumulation of protons and/or inorganic phosphates.
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Metadata
Title
The relationship between oxygen uptake kinetics and neuromuscular fatigue in high-intensity cycling exercise
Authors
John Temesi
Felipe Mattioni Maturana
Arthur Peyrard
Tatiane Piucco
Juan M. Murias
Guillaume Y. Millet
Publication date
01-05-2017
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Applied Physiology / Issue 5/2017
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-017-3585-1

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