The Claim
A single bout of strenuous anaerobic running in five male endurance runners is associated with a 233% increase in plasma growth hormone, a 49% increase in luteinizing hormone, a 13% increase in testosterone, and a 34% increase in androstenedione immediately after exercise, with testosterone and androstenedione levels falling below baseline 6 hours later.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
After a single intense sprinting session, male endurance runners experience immediate increases in plasma growth hormone, luteinizing hormone, testosterone, and androstenedione, followed by a drop in testosterone and androstenedione below baseline levels six hours later.
See the scientific wording
A single bout of strenuous anaerobic running in five male endurance runners is associated with a 233% increase in plasma growth hormone, a 49% increase in luteinizing hormone, a 13% increase in testosterone, and a 34% increase in androstenedione immediately after exercise, with testosterone and androstenedione levels falling below baseline 6 hours later, suggesting transient hormonal fluctuations following intense exercise.
Intense running causes muscle stress and metabolic buildup, which signals the brain to release hormones that tell the pituitary gland to pump out growth hormone, luteinizing hormone, and other sex hormone triggers. This causes the testes to produce more testosterone and androstenedione. After the exercise ends, the body detects high hormone levels and shuts down production, dropping testosterone and androstenedione below normal levels.
What the research says
1 studyAfter one hard sprint-style run, these male runners' bodies temporarily spiked certain hormones like testosterone and growth hormone, but then those levels dropped even lower than before the run six hours later — just like the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.