RED-S replaces the older 'female athlete triad' concept and applies to all athletes. Cyclists are at particular risk because of the emphasis on power-to-weight ratio and the culture of 'riding light.' Warning signs: declining performance despite training, frequent illness, stress fractures, mood changes, and loss of menstrual function in women. The Energy Availability Calculator screens for risk. Treatment: increase calorie intake, reduce training volume, and consult a sports medicine professional.
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