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Sports Medicine

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21.11.2017 | Systematic Review

Lower Serum Zinc Concentration Despite Higher Dietary Zinc Intake in Athletes: A Systematic Review and Meta-analysis

verfasst von: Anna Chu, Cushla Holdaway, Trishala Varma, Peter Petocz, Samir Samman

Erschienen in: Sports Medicine | Ausgabe 2/2018

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Abstract

Background

Zinc is an essential trace element that has been implicated in numerous biological functions, including immunity, energy metabolism and antioxidative processes. Recent evaluations of the literature have provided evidence of significant acute changes in zinc metabolism following a bout of aerobic exercise.

Objective

The aim of this study was to determine the zinc status of trained athletes compared with control populations, as described in cross-sectional studies.

Design

We conducted a systematic literature search of the PubMed, Scopus, SPORTDiscus and Cochrane Library electronic databases from inception to 28 January 2016 to identify cross-sectional studies that determined the zinc status of athletes compared with a control population. Meta-analysis of the differences in serum zinc concentration and dietary zinc intake between groups were conducted.

Results

Twelve studies were included in the systematic review. Of the included studies, nine and eight studies provided sufficient data for the meta-analysis of serum zinc concentration and dietary zinc intake, respectively. Serum zinc concentration was significantly lower in athletes [− 0.93 μmol/L, 95% confidence interval (CI) − 1.62 to − 0.23] despite significantly higher dietary zinc intake compared with the control population (2.57 mg/day, 95% CI 0.97–4.16). Data on erythrocyte and urinary zinc from the included studies were insufficient for meta-analysis.

Conclusions

Despite higher total dietary zinc intake, athletes generally have lower serum zinc concentration, which suggests that athletes have higher requirement of zinc than those who are physically inactive. Further investigations of zinc metabolism during exercise and dietary zinc requirement in active populations are needed to establish evidence-based recommendations.

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Titel: Lower Serum Zinc Concentration Despite Higher Dietary Zinc Intake in Athletes: A Systematic Review and Meta-analysis
verfasst von: Anna Chu
Cushla Holdaway
Trishala Varma
Peter Petocz
Samir Samman
Publikationsdatum: 21.11.2017
Verlag: Springer International Publishing
Erschienen in: Sports Medicine / Ausgabe 2/2018
Print ISSN: 0112-1642
Elektronische ISSN: 1179-2035
DOI: https://doi.org/10.1007/s40279-017-0818-8

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Springer Medizin

Lower Serum Zinc Concentration Despite Higher Dietary Zinc Intake in Athletes: A Systematic Review and Meta-analysis

Abstract

Background

Objective

Design

Results

Conclusions

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