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Letter to the editor
Hormones, offspring sex ratios, and weekly training distances of male runners: implications for overtraining
  1. William H James
  1. The Galton Laboratory, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK

    https://doi.org/10.1136/bjsm.34.6.474-a

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      Editor,—Mackelvie et al1 report that, within a group of male runners, free testosterone levels correlate negatively and highly significantly with the weekly training distance (p<0.005). Crawford et al2 reported that the offspring sex ratio (proportion male) of a sample of male runners varied significantly by …

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