Rhonda Patrick· PhD
Recreational cyclists had the fewest number of sick days. Sedentary controls had twice as many sick days as recreational cyclists, but elite cyclists had four times as many sick days as recreational cyclists.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Recreational cyclists had the fewest number of sick days. Sedentary controls had twice as many sick days as recreational cyclists, but elite cyclists had four times as many sick days as recreational cyclists.
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Moderate exercise of one hour per day for five days a week has been shown to improve the immune system. But intense exercise for two hours or more has been shown to increase the risk of illness. This can be described as a J-Curve.
For example, the J-Curve study we mentioned earlier found that elite cyclists had four times as many sick days as the recreational cyclist and twice as many as the sedentary group.