Self-control exertion and caffeine mouth rinsing: effects on cycling time-trial performance

Boat, R. ORCID: 0000-0002-4897-8118, Williamson, O., Read, J., Jeong, Y.H. and Cooper, S.B. ORCID: 0000-0001-5219-5020, 2021. Self-control exertion and caffeine mouth rinsing: effects on cycling time-trial performance. Psychology of Sport and Exercise, 53: 101877. ISSN 1469-0292

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Objectives: The exertion of self-control has been associated with impaired performance on subsequent physical tasks also requiring self-control. However, the effect in well-trained individuals, and of nutritional intervention strategies to reduce the impact of self-control exertion are unknown. This study, therefore, explored the effect of self-control exertion on endurance performance, and pacing strategies, in well-trained individuals. A further aim was to examine the potential for a caffeine mouth rinse to attenuate any decrements in performance due to self-control exertion.

Method: Following familiarization, fifteen trained male cyclists completed four simulated 10 km cycling time-trials on a cycle ergometer. Prior to each time-trial, participants completed a congruent Stroop task, or an incongruent Stroop task, to manipulate self-control. They also received either a caffeine (containing 40 mg of dissolved caffeine) or placebo mouth-rinse prior to, and every 2 km during, the cycling time-trial. The participants’ performance time, subjective measures (perceived pain, motivation, task importance, and RPE), heart rate, and blood lactate concentration were recorded throughout the time-trials. Data were analysed using three-way (self-control*caffeine*split time) repeated measures ANOVA.

Results: There was no effect of self-control or caffeine on overall 10 km performance time (all p > 0.05). However, following self-control exertion, split time was significantly slower at 3 km (p = 0.031) and 5 km (p = 0.034), and tended to be slower at 1 km (p = 0.088) and 7 km (p = 0.078). There was no effect of the caffeine mouth rinse, nor did this interact with self-control, to affect split times (all p > 0.05). Prior self-control exertion and a caffeine mouth rinse did not influence perceptions of pain, motivation, and task importance in well-trained individuals (all p > 0.05).

Conclusions: Findings suggest that prior self-control exertion affects self-regulatory pacing strategies during the first 7 km of a 10 km cycling time-trial, in well-trained individuals. However, caffeine mouth rinsing does not attenuate the effects of self-control exertion on subsequent endurance performance.

Item Type: Journal article
Publication Title: Psychology of Sport and Exercise
Creators: Boat, R., Williamson, O., Read, J., Jeong, Y.H. and Cooper, S.B.
Publisher: Elsevier
Date: March 2021
Volume: 53
ISSN: 1469-0292
S1469029220308621Publisher Item Identifier
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 07 Jan 2021 09:12
Last Modified: 13 Dec 2022 03:00

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