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A Systematic Meta-Analysis of the Effectiveness of (Left) Hand Contractions on Motor Performance
Mengkai Luan1, Danlei Wang1, Andreas Keil2
1Department of Psychology, Shanghai University of Sport, 650 Qing Yuan Huan Road, Shanghai, 200438, People's Republic of China.
Sport, Exercise, and Performance Psychology
|February 28, 2025
Summary
Unilateral left hand contractions (LHCs) show a moderate effect on motor performance. However, this effect may be less robust due to study quality and publication bias concerns.
Area of Science:
- Neuroscience
- Sports Science
- Motor Control
Background:
- Unilateral left hand contractions (LHCs) are proposed interventions for optimizing behavior.
- The efficacy and neurophysiological underpinnings of LHCs remain largely unexplored.
Purpose of the Study:
- To systematically review and synthesize evidence on the effectiveness of LHCs as a pre-performance routine for motor performance.
- To discuss theoretical background, methodological considerations, and future research directions.
Main Methods:
- Systematic meta-analysis of peer-reviewed literature.
- Electronic searches across PubMed, PsycInfo, Google Scholar, Scopus, and SPORTDiscus.
- Inclusion of 10 studies (12 effect sizes) meeting quality assessment criteria.
Main Results:
- A moderate effect of LHC interventions on motor performance was found (g = 0.59).
- The effect was significant in experimental designs, with sub-elite/elite athletes, and under high pressure.
- Publication bias analysis suggested a potentially less robust effect.
Conclusions:
- The moderate effect of LHCs on motor performance should be interpreted cautiously.
- Concerns regarding study quality and neurophysiological specificity limit current understanding.
- Further research is needed to clarify the impact and mechanisms of LHC interventions.
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