Caffeine increases both total work performed above critical power and peripheral fatigue during a 4-km cycling time trial

Journal of Applied Physiology
Leandro Camati FelippeAdriano Eduardo Lima-Silva

Abstract

The link between total work performed above critical power (CP) and peripheral muscle fatigue during self-paced exercise is unknown. We investigated the influence of caffeine on the total work done above CP during a 4-km cycling time trial (TT) and the subsequent consequence on the development of central and peripheral fatigue. Nine cyclists performed three constant-load exercise trials to determine CP and two 4-km TTs ~75 min after oral caffeine (5 mg/kg) or cellulose (placebo) ingestion. Neuromuscular functions were assessed before and 50 min after supplementation and 1 min after TT. Oral supplementation alone had no effect on neuromuscular function ( P > 0.05). Compared with placebo, caffeine increased mean power output (~4%, P = 0.01) and muscle recruitment (as inferred by EMG, ~17%, P = 0.01) and reduced the time to complete the TT (~2%, P = 0.01). Work performed above CP during the caffeine trial (16.7 ± 2.1 kJ) was significantly higher than during the placebo (14.7 ± 2.1 kJ, P = 0.01). End-exercise decline in quadriceps twitch force (pre- to postexercise decrease in twitch force at 1 and 10 Hz) was more pronounced after caffeine compared with placebo (121 ± 13 and 137 ± 14 N vs. 146 ± 13 and 156 ± 11 N; P < 0.05). There ...Continue Reading

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Citations

Oct 3, 2018·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Paul T MorganStephen J Bailey
Nov 26, 2019·Experimental Physiology·Ryan M BroxtermanThomas J Hureau
Dec 29, 2019·Experimental Physiology·Jeanne DekerleMark Hayes
Mar 4, 2020·Sports Medicine·Vitor De Salles PainelliFlávio Oliveira Pires
May 15, 2020·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Pamela S SantosAdriano E Lima-Silva
Apr 23, 2020·European Journal of Applied Physiology·Leandro Camati FelippeAdriano E Lima-Silva
Aug 30, 2018·European Journal of Applied Physiology·Marcos David Silva-CavalcanteRomulo Bertuzzi
Sep 24, 2020·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Slim ZarzissiThomas J Hureau
Feb 25, 2021·Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas·F Dall'AcquaA E Lima-Silva
Oct 17, 2020·Medicine and Science in Sports and Exercise·Timothy J FultonRobert F Chapman
May 26, 2021·Medicine and Science in Sports and Exercise·Hans Kristian StadheimJørgen Jensen
Dec 1, 2021·Critical Reviews in Food Science and Nutrition·Alisson H MarinhoGustavo G de Araujo

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Methods Mentioned

BETA
force measurement

Software Mentioned

Statistics Package
Computrainer
RacerMate One

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