Science & technology | Menstruation and sport

How menstruation affects athletic prowess is poorly understood

Changing that will give sportswomen a new way to improve performance

Tokyo 2020 Olympics - Swimming - Women's 100m Freestyle - Final - Tokyo Aquatics Centre - Tokyo, Japan - July 30, 2021. Emma McKeon of Australia in action REUTERS/Antonio Bronic - SP1EH7U05X7SW

Just 0.63 seconds separated first from fourth place in the women’s 100 metres freestyle at the recent Tokyo Olympic Games—a race where the winning time was 51.96 seconds. In light of this and similar facts, it is not surprising that elite athletes are constantly searching for ways to get even 1% better. To that end, they hire strength coaches, nutritionists and sports psychologists. And lately, some female athletes have been trying a new tack: working with menstrual-cycle coaches.

This article appeared in the Science & technology section of the print edition under the headline “Cycle races”

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