Self-control exertion and glucose supplementation prior to endurance performance

Boat, R. ORCID: 0000-0002-4897-8118, Taylor, I.M. and Hulston, C.J., 2017. Self-control exertion and glucose supplementation prior to endurance performance. Psychology of Sport and Exercise, 29, pp. 103-110. ISSN 1469-0292

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Abstract

Objectives:
Completion of a task requiring self-control may negatively impact on subsequent self-regulatory efforts. This study explored a) whether this effect occurs during a well-practiced endurance task, b) the potential for glucose supplementation to moderate this effect, and c) whether this effect differed over time.
Method:
Fourteen trained cyclists completed four simulated 16 km time trials on an electromagnetically braked cycle ergometer. Prior to each time trial, participants completed a congruent Stroop task or an incongruent Stroop task that required self-control. They also received either a glucose-based drink or placebo. Participants’ performance time and heart rate were recorded throughout the time trials.
Results:
Multilevel growth curve analysis revealed a significant three-way interaction between self-control, glucose, and time (b = -0.91; p = 0.02). When participants did not exert self-control (congruent Stroop) or consume glucose (placebo drink) they were slowest during the early stages of the time trial but quickest over the full distance. No differences were found in heart rate across the four conditions.
Conclusions:
Findings suggest that pacing may explain why self-control exertion interferes with endurance performance. Moreover, the debate revolving around depletion of self-control must consider that any observed effects may be dependent on the timing of performance inspection.

Item Type: Journal article
Publication Title: Psychology of Sport and Exercise
Creators: Boat, R., Taylor, I.M. and Hulston, C.J.
Publisher: Elsevier
Date: March 2017
Volume: 29
ISSN: 1469-0292
Identifiers:
NumberType
10.1016/j.psychsport.2016.12.007DOI
S1469029216303570Publisher Item Identifier
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 21 Aug 2017 07:43
Last Modified: 21 Aug 2017 07:43
URI: http://irep.ntu.ac.uk/id/eprint/31439

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