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

Temesi, John, Mattioni Maturana, Felipe, Peyrard, Arthur, Piucco, Tatiane, Murias, Juan and Millet, Guillaume (2017) The relationship between oxygen uptake kinetics and neuromuscular fatigue in high-intensity cycling exercise. European Journal of Applied Physiology, 117 (5). pp. 969-978. ISSN 1439-6319

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Purpose: In theory, a slow oxygen uptake (V˙ O2) 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 V˙ O2, peak power output (POpeak), and V˙ O2 kinetics responses in the unfatigued state (τ V˙ O2 MOD), 10 healthy young adults performed a 6-min cycling bout at 80% POpeak (INT6-min). V˙ O2 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 V˙ O2 MOD and τ V˙ O2 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 V˙ O2 MOD and ΔDb10 (ρ = −0.74; P < 0.05) and between τV˙ O2 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 V˙ O2 kinetics experience more peripheral fatigue, in particular more excitation–contraction coupling failure, likely due to a greater accumulation of protons and/or inorganic phosphates.

Item Type: Article
Uncontrolled Keywords: Muscle fatigue, Oxygen uptake kinetics, Intense cycling exercise, Excitation–contraction coupling failure
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Paul Burns
Date Deposited: 13 Sep 2018 16:18
Last Modified: 11 Oct 2019 14:18

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