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Changes in body mass alone explain almost all of the variance in the serum sodium concentrations during prolonged exercise. Has commercial influence impeded scientific endeavour?

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  • Funding The author's work on which this article is based is funded by the University of Cape Town, the Medical Research Council, Discovery Health and the National Research Foundation through the THRIP initiative.

  • Competing interests Between 1981 and 2008, the author received research funding from two companies producing sports drinks, Leppin, manufacturers of Leppin FRN and Bromor Foods/Cadbury Schweppes, manufacturers of Energade. He currently receives no research support from the sports drink industry.

  • Provenance and peer review Not commissioned; externally peer reviewed.