No study in the record confirms daily runners have 41% lower testosterone levels?

checkthis · automated fact-check · How we check

While chronic endurance exercise can reduce resting testosterone in some male athletes, no study in the record confirms that daily runners have 41% lower testosterone. The Reel claims a study found men who run daily have 41% lower testosterone levels. While NIH research indicates that 15 to 25 percent of chronic endurance runners experience lower resting testosterone, no study in the medical record documents a 41 percent reduction.

1 claim checked
Checked 31 Oct 2026

The post we checked

The relationship between running and testosterone depends on training intensity, recovery, nutrition and overall energy availability. Moderate running is…

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What we checked

A study shows men who run daily have 41 percent lower testosterone levels.No reliable source found for this yet.

What the post doesn't tell you

NIH research notes that chronic endurance training leads to low resting testosterone in approximately 15 to 25 percent of male athletes.
A study cited in sports physiology literature found that elite long-distance runners averaging ~81 km per week had significantly lower total testosterone than less active men (Runningexplained).
What can't be established: Which specific publication or study the Reel derived its 41 percent statistic from.

Short version

❓ NO PROOF YET 👉 While NIH research indicates that 15 to 25 percent of chronic endurance runners experience lower resting testosterone, no study in the medical record documents a 41 percent reduction. 🔎 Full check: send this post to @checkthis.chat