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Sodium ingestion and hyponatraemia: sports drinks do not prevent a fall in serum sodium concentration during exercise
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    Over-extrapolation of research

    Dear Editor,

    We appreciated the recent letter by Dugas in this journal (BJSM 2006;40:372) because it provides an excellent teaching tool for students on the dangers of over-extrapolating published data. Most scientifically puzzling is the figure published with Dugas’ letter. In that figure, Dugas replots data from an elderly woman exercising intermittently for 150 minutes, then extends a linear regression line b...

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    Conflict of Interest:
    None declared.