The relationship between oxygen uptake kinetics and neuromuscular fatigue in high-intensity cycling exercise
Deutscher übersetzter Titel: | Die Beziehung zwischen der Sauerstoffaufnahmekinetik und der neuromuskulären Ermüdung bei hochintensivem Radsporttraining |
---|---|
Autor: | Temesi, John; Mattioni Maturana, Felipe; Peyrard, Arthur; Piucco, Tatiane; Murias, Juan Manuel; Millet, Guillaume Y. |
Erschienen in: | European journal of applied physiology |
Veröffentlicht: | 117 (2017), 5, S. 969-978, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1439-6319, 0301-5548 |
DOI: | 10.1007/s00421-017-3585-1 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201806004525 |
Quelle: | BISp |
Abstract des Autors
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.