25 Nov '16, 11pm

Ryan Hall says low testosterone played a role in his struggles. Should other runners worry?

Ryan Hall says low testosterone played a role in his struggles. Should other runners worry?

What does testosterone do for you, exactly? As the main sex hormone for males, testosterone fuels facial- and body-hair growth, sex drive, and sperm production. Testosterone plays a key role in building muscle, helping your body produce and assemble the proteins required to construct lean mass. Though most runners wouldn’t want a Schwarzenegger-like physique, a dropoff in muscle strength can lead to fatigue that impairs performance in endurance sports like distance running, says endocrinologist John Morley, M.D., a low testosterone expert at St. Louis University School of Medicine. Testosterone also protects men’s bone health, much the way estrogen works for women (who, though they have some testosterone, too, don’t need nearly as much—and essentially no research links low levels to poor performance in women). Finally—critical for runners—testosterone boosts red blood cell...

Full article: http://www.runnersworld.com/health/training-and-low-t-und...

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