OtherHumann = 501984
Scrotal hypothermia and the infertile man.
Plain-language summary
This study set out to test whether cooling the scrotum could improve semen in men with a low sperm count or poor sperm movement. Fifty such men wore jockey shorts holding ice packs against the scrotum at night, and sperm density and movement were compared before and after. In 65% of them sperm density at least doubled, with comparable improvements in movement. The result was the same whether or not the man had a varicocele (enlarged veins in the scrotum, a common finding in men with a low sperm count). There was no untreated comparison group, so the before-and-after change is what this study can show and not what caused it.
Key findings
- In 65% of the 50 men, sperm density at least doubled after nightly scrotal cooling.
- Comparable improvements were seen in sperm movement.
- The proportion of men who improved was the same whether or not a varicocele was present.
- Every man in the study was treated. There was no untreated comparison group, so nothing here separates the cooling from time or from anything else that changed.
How to analyze the study yourself
- Study type
- This design tests an intervention in a specific group, so it can show whether the intervention worked in that group, but it cannot rule out other factors that might have influenced the results.
- Population
- 50 men with a low sperm count or poor sperm movement. Every one of them was treated and there was no untreated comparison group.
- Funding
- Not reported
- Takeaway
- In men with a low sperm count or poor sperm movement, this study found that sperm density at least doubled in 65% of them after cooling the scrotum at night with ice packs, and that it made no difference whether the man had a varicocele. Every man was treated and there was no comparison group, so read it as a strong before-and-after signal rather than a demonstration that the cooling caused it. If you are trying to conceive, it may be worth asking your doctor about keeping your testicles cool.