Effects of caffeine on neuromuscular fatigue and performance during high-intensity cycling exercise in moderate hypoxia

Smirmaul, Bruno P. C., de Moraes, Antonio Carlos, Angius, Luca and Marcora, Samuele M. (2017) Effects of caffeine on neuromuscular fatigue and performance during high-intensity cycling exercise in moderate hypoxia. European Journal of Applied Physiology, 117 (1). pp. 27-38. ISSN 1439-6319

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Official URL: https://doi.org/10.1007/s00421-016-3496-6

Abstract

PURPOSE: To investigate the effects of caffeine on performance, neuromuscular fatigue and perception of effort during high-intensity cycling exercise in moderate hypoxia.

METHODS: Seven adult male participants firstly underwent an incremental exercise test on a cycle ergometer in conditions of acute normobaric hypoxia (fraction inspired oxygen = 0.15) to establish peak power output (PPO). In the following two visits, they performed a time to exhaustion test (78 ± 3% PPO) in the same hypoxic conditions after caffeine ingestion (4 mg kg-1) and one after placebo ingestion in a double-blind, randomized, counterbalanced cross-over design.

RESULTS: Caffeine significantly improved time to exhaustion by 12%. A significant decrease in subjective fatigue was found after caffeine consumption. Perception of effort and surface electromyographic signal amplitude of the vastus lateralis were lower and heart rate was higher in the caffeine condition when compared to placebo. However, caffeine did not reduce the peripheral and central fatigue induced by high-intensity cycling exercise in moderate hypoxia.

CONCLUSION: The caffeine-induced improvement in time to exhaustion during high-intensity cycling exercise in moderate hypoxia seems to be mediated by a reduction in perception of effort, which occurs despite no reduction in neuromuscular fatigue.

Item Type: Article
Uncontrolled Keywords: Adult, Athletic Performance, Caffeine/administration & dosage, Central Nervous System Stimulants/administration & dosage, Exercise, Humans, Hypoxia/metabolism, Male, Muscle Fatigue/drug effects, Muscle, Skeletal/drug effects
Subjects: B100 Anatomy, Physiology and Pathology
C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Rachel Branson
Date Deposited: 06 Mar 2020 16:09
Last Modified: 06 Mar 2020 16:15
URI: http://nrl.northumbria.ac.uk/id/eprint/42403

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