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Central and peripheral manipulations of perceived exertion and endurance performance

Pageaux, Benjamin (2014) Central and peripheral manipulations of perceived exertion and endurance performance. Doctor of Philosophy (PhD) thesis, University of Kent,. (KAR id:47714)

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Abstract

Perception of effort, defined as “the conscious sensation of hard, heavy and strenuous exercise”, is known to regulate endurance performance and human behaviour. Perception of effort has recently been shown to be exacerbated by mental exertion and is also known to be a main feature of fatigue. However, to date, not only its neurophysiology but also how manipulations of perceived exertion might impact endurance performance remain poorly understood. The main aim of this thesis was to investigate how manipulations of perceived exertion might impact endurance performance.

In the first part (central manipulations), we firstly investigated the impact of exacerbating perceived exertion via mental exertion involving the response inhibition process on self-paced running endurance performance. This study demonstrated that as with time to exhaustion tests, time trial performance is impaired following mental exertion leading to mental fatigue. Secondly, we investigated whether mental exertion leading to mental fatigue could alter the rate of central fatigue development during constant load whole-body exercise. This study demonstrated that the exacerbated perception of effort in presence of mental fatigue does not reflect an altered rate of central fatigue development, but is likely to be due to i) an impaired central motor command and/or ii) an alteration of the central processing of the corollary discharge. Thirdly, we investigated whether mental exertion could impact the repeatability of maximal voluntary contraction of the knee extensors. We found that contrary to submaximal exercise, force production capacity is not altered by mental exertion. Finally, these three studies demonstrated that i) mental exertion negatively impacts submaximal exercise but not maximal exercise and that ii) mental fatigue differs from central fatigue.

This thesis, when integrating both experimental parts, provides new insight on how perception of effort regulates endurance performance. Specifically, it demonstrates how muscle fatigue is a contributor of the continuous increase in perception of effort during endurance exercise, but also that other contributors play a role in this increase in perception of effort. Indeed, we demonstrated for the first time that i) perception of effort alterations in the presence of mental fatigue is independent of any alterations of the neuromuscular system, and ii) muscle afferents does not directly impact perception of effort, but may influence it indirectly via their role in motor control.

Item Type: Thesis (Doctor of Philosophy (PhD))
Uncontrolled keywords: perception of effort, sense of effort, endurance performance, muscle fatigue, central fatigue, peripheral fatigue, mental fatigue, Stroop task, psychophysiology, psychobiology, neurophysiology, transcranial magnetic stimulation, cervicomedullary stimulation, cycling, running
Subjects: G Geography. Anthropology. Recreation > GV Recreation. Leisure > Sports sciences
R Medicine > RC Internal medicine > RC1200 Sports medicine
R Medicine > RC Internal medicine > RC1235 Physiology of sports
Divisions: Divisions > Division of Natural Sciences > School of Sport and Exercise Sciences
Depositing User: Users 1 not found.
Date Deposited: 18 Mar 2015 01:00 UTC
Last Modified: 16 Feb 2021 13:23 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/47714 (The current URI for this page, for reference purposes)
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