Polyphenols and Performance: A Systematic Review and Meta-Analysis.
Vaughan Somerville1, Cameron Bringans2, Andrea Braakhuis3
1Department of Nutrition and Dietetics, Faculty of Medical and Health Science, The University of Auckland, Auckland, New Zealand. vsom721@aucklanduni.ac.nz.
Polyphenol supplements, particularly quercetin, can enhance athletic performance by nearly 2% when taken for over a week. These antioxidants show promise for improving fitness in healthy individuals without reported side effects.
Area of Science:
- Nutritional Science
- Exercise Physiology
- Biochemistry
Background:
- Polyphenols possess physiological effects influencing athletic performance.
- While antioxidants, they can stimulate pathways for mitochondrial biogenesis and vascular function.
- Potential dual role in hindering training adaptations yet promoting cellular signaling.
Purpose of the Study:
- To ascertain the aggregate impact of polyphenol consumption on human athletic capabilities.
- To synthesize evidence regarding polyphenol efficacy in sports performance.
Main Methods:
- Comprehensive literature search across major biomedical databases (MEDLINE, EMBASE, CINAHL, AMED, SPORTDiscus).
- Systematic screening and independent review of 14 selected studies for meta-analysis.
- Analysis focused on trained male populations with an average daily intake of 688 ± 478 mg.
Main Results:
- Polyphenol supplementation for ≥7 days resulted in a 1.90% performance increase (95% CI 0.40-3.39).
- Quercetin supplementation specifically showed a 2.82% performance improvement (95% CI 2.05-3.58).
- No adverse effects were documented across the included studies.
Conclusions:
- Polyphenols, with a notable mention of quercetin, are effective supplements for enhancing athletic performance.
- Findings support the use of polyphenols in healthy individuals seeking performance improvements.
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