Muscle metabolic and neuromuscular determinants of fatigue during cycling in different exercise intensity domains.

Journal article


Black, MI, Blackwell, JR, Bailey, SJ, Wylie, LJ, McDonagh, STJ, Thompson, C, Kelly, J, Sumners, P, Mileva, K., Bowtell, JL and Vanhatalo, A (2017). Muscle metabolic and neuromuscular determinants of fatigue during cycling in different exercise intensity domains. Journal of Applied Physicology (1985). 122 (3), pp. 446-459. https://doi.org/10.1152/japplphysiol.00942.2016
AuthorsBlack, MI, Blackwell, JR, Bailey, SJ, Wylie, LJ, McDonagh, STJ, Thompson, C, Kelly, J, Sumners, P, Mileva, K., Bowtell, JL and Vanhatalo, A
Abstract

Lactate or gas exchange threshold (GET) and critical power (CP) are closely associated with human exercise performance. We tested the hypothesis that the limit of tolerance (Tlim) during cycle exercise performed within the exercise intensity domains demarcated by GET and CP is linked to discrete muscle metabolic and neuromuscular responses. Eleven men performed a ramp incremental exercise test, 4-5 severe-intensity (SEV; >CP) constant-work-rate (CWR) tests until Tlim, a heavy-intensity (HVY; <CP but >GET) CWR test until Tlim, and a moderate-intensity (MOD; <GET) CWR test until Tlim Muscle biopsies revealed that a similar (P > 0.05) muscle metabolic milieu (i.e., low pH and [PCr] and high [lactate]) was attained at Tlim (approximately 2-14 min) for all SEV exercise bouts. The muscle metabolic perturbation was greater at Tlim following SEV compared with HVY, and also following SEV and HVY compared with MOD (all P < 0.05). The normalized M-wave amplitude for the vastus lateralis (VL) muscle decreased to a similar extent following SEV (-38 ± 15%), HVY (-68 ± 24%), and MOD (-53 ± 29%), (P > 0.05). Neural drive to the VL increased during SEV (4 ± 4%; P < 0.05) but did not change during HVY or MOD (P > 0.05). During SEV and HVY, but not MOD, the rates of change in M-wave amplitude and neural drive were correlated with changes in muscle metabolic ([PCr], [lactate]) and blood ionic/acid-base status ([lactate], [K(+)]) (P < 0.05). The results of this study indicate that the metabolic and neuromuscular determinants of fatigue development differ according to the intensity domain in which the exercise is performed.NEW & NOTEWORTHY The gas exchange threshold and the critical power demarcate discrete exercise intensity domains. For the first time, we show that the limit of tolerance during whole-body exercise within these domains is characterized by distinct metabolic and neuromuscular responses. Fatigue development during exercise greater than critical power is associated with the attainment of consistent "limiting" values of muscle metabolites, whereas substrate availability and limitations to muscle activation may constrain performance at lower intensities.

Keywordscritical power; cycling exercise; gas exchange threshold; muscle metabolism; neuromuscular fatigue; 06 Biological Sciences; 11 Medical And Health Sciences; Physiology
Year2017
JournalJournal of Applied Physicology (1985)
Journal citation122 (3), pp. 446-459
PublisherAmerican Physiological Society
ISSN1522-1601
Digital Object Identifier (DOI)https://doi.org/10.1152/japplphysiol.00942.2016
Publication dates
Print01 Mar 2017
Publication process dates
Deposited27 Mar 2017
Accepted16 Dec 2016
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