Vitamin C and exercise-induced immunodepression : [Letter]

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http://hdl.handle.net/10138/228094

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Hemilä , H 2007 , ' Vitamin C and exercise-induced immunodepression : [Letter] ' , European Journal of Clinical Nutrition , vol. 61 , no. 10 , pp. 1241-1242 . https://doi.org/10.1038/sj.ejcn.1602751

Title: Vitamin C and exercise-induced immunodepression : [Letter]
Author: Hemilä, Harri
Contributor: University of Helsinki, Department of Public Health
Date: 2007
Language: eng
Number of pages: 2
Belongs to series: European Journal of Clinical Nutrition
ISSN: 0954-3007
URI: http://hdl.handle.net/10138/228094
Abstract: Moreira et al (2007) systematically reviewed the role of nutrition on exercise-induced immunodepression. However, their paper has several shortcomings. Moreira refers to Nieman’s ‘J’-curve hypothesis, which proposes that moderate exercise improves the immune system and reduces the risk of upper respiratory tract infections (URI), whereas excessive physical stress impairs the immune system and increases URI risk (Nieman, 1994). In a large cohort, we found that the risk of the common cold and pneumonia was not reduced with moderate physical activity, refuting the universal validity of the ‘J’-model (Hemila et al, 2003, 2006). There is strong evidence of positive effect of vitamin C on physically stressed people and there is no valid evidence that vitamin C would be harmful to ordinary people in doses of 1–2 g/day. Therefore, physically active people, who consider that they suffer from colds frequently, can use vitamin C, while at the same time, we hope that new trials would be carried out.
Subject: RESPIRATORY-TRACT INFECTION
PHYSICAL-ACTIVITY
BETA-CAROTENE
COMMON COLD
SUPPLEMENTATION
PNEUMONIA
RISK
314 Health sciences
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