Central and Peripheral Fatigue in Male Cyclists after 4-, 20-, and 40-km Time Trials

Thomas, Kevin, Goodall, Stuart, Stone, Mark, Howatson, Glyn, Gibson, Alan St Clair and Ansley, Les (2015) Central and Peripheral Fatigue in Male Cyclists after 4-, 20-, and 40-km Time Trials. Medicine & Science in Sports & Exercise, 47 (3). pp. 537-546. ISSN 0195-9131

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Abstract

Purpose: Few studies have assessed neuromuscular fatigue after self-paced locomotor exercise; moreover, none have assessed the degree of supraspinal fatigue. This study assessed central and peripheral fatigue after self-paced exercise of different durations. Methods: Thirteen well-trained male cyclists completed 4 km, 20 km and 40 km simulated time-trials (TTs). Pre- and immediately post-TT (< 2.5 min), twitch responses from the knee-extensors to electrical stimulation of the femoral nerve and transcranial magnetic stimulation of the motor cortex were recorded to assess neuromuscular and corticospinal function. Results: Time to complete 4 km, 20 km and 40 km was 6.0±0.2 min, 31.8±1.0 min and 65.8±2.2 min, at average exercise intensities of 96%, 92% and 87% of V̇ O2max, respectively. Exercise resulted in significant reductions in maximum voluntary contraction, with no difference between TTs (–18%, –15% and –16% for 4, 20 and 40 km respectively). Greater peripheral fatigue was evident after the 4 km (40% reduction in potentiated twitch) compared to the 20 km (31%) and 40 km TTs (29%). In contrast, longer TTs were characterized by more central fatigue, with greater reductions in voluntary activation measured by motor nerve (–11% and – 10% for 20 km and 40 km vs. –7% for 4 km) and cortical (–12% and –10% for 20 km and 40 km vs. –6% for 4 km) stimulation. Conclusions: These data demonstrate fatigue after selfpaced exercise is task-dependent, with a greater degree of peripheral fatigue after shorter, higher intensity (~6 min) TTs and more central fatigue after longer, lower intensity TTs (>30 min).

Item Type: Article
Additional Information: 'This is a non-final version of an article published in final form in (THOMAS, K., S. GOODALL, M. STONE, G. HOWATSON, A. ST CLAIR GIBSON, and L. ANSLEY. Central and Peripheral Fatigue in Male Cyclists after 4-, 20-, and 40-km Time Trials. Med. Sci. Sports Exerc., Vol. 47, No. 3, pp. 537–546, 2015)'
Divisions: ?? BucksNewUniversity ??
Depositing User: ULCC Admin
Date Deposited: 26 Apr 2016 14:22
Last Modified: 11 Dec 2017 19:17
URI: http://bucks.repository.guildhe.ac.uk/id/eprint/9394

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