Marcos David Silva-Cavalcante1,2, Patrícia Guimaraes Couto3, Rafael de Almeida Azevedo3, Renata Gonçalves Silva3, Daniel Boari Coelho4, Adriano Eduardo Lima-Silva5,6, Romulo Bertuzzi3. 1. Department of Sport, Endurance Sports Research Group (GEDAE-USP), School of Physical Education and Sport, University of São Paulo, Av. Prof. Mello de Moraes, 65, University city, São Paulo, SP, CEP: 05508-030, Brazil. cavalcantemds@usp.br. 2. Sport Science Research Group, Post-graduation Program Nutrition, Physical Activity and Phenotypic Plasticity, Academic Center of Vitoria, Federal University of Pernambuco, Pernambuco, Brazil. cavalcantemds@usp.br. 3. Department of Sport, Endurance Sports Research Group (GEDAE-USP), School of Physical Education and Sport, University of São Paulo, Av. Prof. Mello de Moraes, 65, University city, São Paulo, SP, CEP: 05508-030, Brazil. 4. Center of Engineering, Modeling and Applied Social Science, Federal University of ABC, Sao Paulo, Brazil. 5. Sport Science Research Group, Post-graduation Program Nutrition, Physical Activity and Phenotypic Plasticity, Academic Center of Vitoria, Federal University of Pernambuco, Pernambuco, Brazil. 6. Human Performance Research Group, Academic Department of Physical Education, Technological Federal University of Parana, Curitiba, Parana, Brazil.
Abstract
PURPOSE: The purpose of this study was to investigate the effects of mental fatigue, characterized by a subjective feeling of tiredness, on the development of neuromuscular fatigue during a 4-km cycling time trial (4-km TT). METHODS: Eight recreationally trained male cyclists performed a 4-km TT after either performing a prolonged cognitive task (mental fatigue) or after viewing emotionally neutral documentaries (control). The neuromuscular function of the knee extensors was assessed using electrical nerve stimulation at baseline, before (pre-TT), and after (post-TT) the 4-km TT. Rating of perceived exertion (RPE) and physiological variables were periodically measured during 4-km TT. RESULTS: Subjective ratings of fatigue increased significantly only after a prolonged cognitive task (P = 0.022). Neuromuscular function at baseline was similar between conditions and remained unchanged at pre-TT. Time to complete the 4-km TT was similar between control (376 ± 27 s) and mental fatigue (376 ± 26 s). There was no significant difference between conditions for RPE, [Formula: see text], [Formula: see text], and HR throughout the exercise. The 4-km TT-induced similar decrease (from baseline to post-TT) in maximal voluntary contraction (mental fatigue - 11 ± 10%, control - 16 ± 12%), twitch force (mental fatigue - 26 ± 16%, control - 24 ± 17%), and voluntary activation (mental fatigue - 5 ± 7%, control - 3 ± 2%) for both conditions. CONCLUSION: Mental fatigue induced by prolonged cognitive task does not impair performance nor alter the degree of central and peripheral fatigue development during self-paced exercise in recreationally trained cyclists.
PURPOSE: The purpose of this study was to investigate the effects of mental fatigue, characterized by a subjective feeling of tiredness, on the development of neuromuscular fatigue during a 4-km cycling time trial (4-km TT). METHODS: Eight recreationally trained male cyclists performed a 4-km TT after either performing a prolonged cognitive task (mental fatigue) or after viewing emotionally neutral documentaries (control). The neuromuscular function of the knee extensors was assessed using electrical nerve stimulation at baseline, before (pre-TT), and after (post-TT) the 4-km TT. Rating of perceived exertion (RPE) and physiological variables were periodically measured during 4-km TT. RESULTS: Subjective ratings of fatigue increased significantly only after a prolonged cognitive task (P = 0.022). Neuromuscular function at baseline was similar between conditions and remained unchanged at pre-TT. Time to complete the 4-km TT was similar between control (376 ± 27 s) and mental fatigue (376 ± 26 s). There was no significant difference between conditions for RPE, [Formula: see text], [Formula: see text], and HR throughout the exercise. The 4-km TT-induced similar decrease (from baseline to post-TT) in maximal voluntary contraction (mental fatigue - 11 ± 10%, control - 16 ± 12%), twitch force (mental fatigue - 26 ± 16%, control - 24 ± 17%), and voluntary activation (mental fatigue - 5 ± 7%, control - 3 ± 2%) for both conditions. CONCLUSION:Mental fatigue induced by prolonged cognitive task does not impair performance nor alter the degree of central and peripheral fatigue development during self-paced exercise in recreationally trained cyclists.
Entities:
Keywords:
Central fatigue; Endurance performance; Mental exertion; Peripheral fatigue
Authors: Mark R Stone; Kevin Thomas; Michael Wilkinson; Alan St Clair Gibson; Kevin G Thompson Journal: Eur J Appl Physiol Date: 2011-01-11 Impact factor: 3.078
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