Interactions between perceptions of fatigue, effort and affect decrease knee extensor endurance performance following upper body motor activity, independent of alterations to neuromuscular function

Greenhouse-Tucknott, A., Wrightson, J., Raynsford, M., Harrison, N.A. ORCID: https://orcid.org/0000-0002-9584-3769 and Dekerle, J. 2020. Interactions between perceptions of fatigue, effort and affect decrease knee extensor endurance performance following upper body motor activity, independent of alterations to neuromuscular function. Psychophysiology 57 (9) , e13602. 10.1111/psyp.13602

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Abstract

Prior exercise has previously been shown to impair subsequent endurance performance in non‐activated muscles. Declines in the neuromuscular function and altered perceptual/affective responses offer possible mechanisms through which endurance performance may be limited in these remote muscle groups. We thus conducted two experiments to better understand these performance‐limiting mechanisms. In the first experiment, we examined the effect of prior handgrip exercise on the behavioral, perceptual, and affective responses to a sustained, sub‐maximal contraction of the knee extensors. In the second experiment, transcranial magnetic stimulation was used to assess the neuromuscular function of the knee extensors before and after the handgrip exercise. The results of the first experiment demonstrated prior handgrip exercise increased the perceptions of effort and reduced affective valence during the subsequent knee extensor endurance exercise. Both effort and affect were associated with endurance performance. Subjective ratings of fatigue were also increased by the preceding handgrip exercise but were not directly related to knee extensor endurance performance. However, perceptions of fatigue were correlated with heightened effort perception and reduced affect during the knee extensor contraction. In the second experiment, prior handgrip exercise did not significantly alter the neuromuscular function of the knee extensors. The findings of the present study indicate that motor performance in the lower limbs following demanding exercise in the upper body appears to be regulated by complex, cognitive‐emotional interactions, which may emerge independent of altered neuromuscular function. Subjective fatigue states are implicated in the control of perceptual and affective processes responsible for the regulation of endurance performance.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Publisher:	Wiley
ISSN:	0048-5772
Date of First Compliant Deposit:	27 May 2020
Date of Acceptance:	4 May 2020
Last Modified:	19 Nov 2024 06:15
URI:	https://orca.cardiff.ac.uk/id/eprint/131904

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