How long can you be in a hot tub until your sperm count hits 0 | Paul Turek, M.D.
Peter Attia MDPublished on June 4, 2025
Summary authored by editor@wellifi.com
TLDR Summary
Activities that raise the temperature of the testes, such as hot tubbing and saunas, can negatively impact sperm production and male fertility. However, exposure to cold temperatures like cold plunges is considered safe and does not pose the same risk. Understanding these temperature effects is crucial for making informed lifestyle choices regarding fertility health.
Key Points
- The testes are located outside the body to maintain a temperature about 3°F cooler than the rest of the body.
- Activities such as hot tubbing and saunas can increase the testicular temperature, posing a risk to sperm production.
- Spending 20 minutes at 104°F in a hot tub or bath three times a week can severely reduce sperm count.
- Saunas, steam rooms, and showers are less harmful to sperm production than submersion in hot water.
- Cold plunges do not pose the same risk to fertility and are considered safe for sperm production.
The Impact of Temperature Exposure on Male Fertility: Saunas, Hot Tubs, and Cold Plunges
When it comes to male fertility, temperature plays a crucial role, particularly the temperature exposure of the testes. Unlike the rest of the body, the testes are located outside and maintain a temperature about 3°F cooler. This delicate balance can be disrupted by activities such as saunas, hot tubs, and even cold plunges. Understanding the effects of these temperature changes is vital for those concerned about fertility.
Hot Tubs and Saunas: A Thermal Threat to Fertility
The principle behind the external location of the testes is to keep them cooler than the body's core temperature, which is around 98°F, maintaining them at about 95°F. However, activities involving high temperatures, especially those involving water, such as hot tubs, baths, jacuzzis, and steam rooms, can significantly alter this balance.
Submersion in hot water is particularly impactful. For instance, entering a 105°F hot tub causes the testes to quickly reach this temperature, posing a risk to sperm production. Research has shown that spending 20 minutes at 104°F in a hot tub or bath three times a week can severely reduce sperm count, potentially leading to infertility.
Saunas, Steam Rooms, and Showers: Less Risk Than Submersion
While the risk associated with hot tubs and baths is substantial, not all heat exposure poses the same threat. Saunas, which do not involve submersion, along with steam rooms and showers, are considered less harmful to sperm production. The air in these environments does not heat the testes as uniformly or as quickly as submerging in hot water.
Cold Plunges: Safe for Sperm
On the flip side of the temperature spectrum, cold exposure, particularly brief immersion in cold water, does not pose the same risk to fertility. Cold plunges, which involve submerging the body in cold water for short periods, are considered safe for sperm production. The rapid cooling and subsequent return to normal temperature do not adversely affect the sperm or the testicular environment.
Conclusion
Temperature exposure plays a significant role in male fertility, with activities like hot tubs and saunas presenting potential risks due to their heating effect on the testes. However, not all forms of temperature exposure are harmful; cold plunges, for instance, do not pose a threat to sperm production. Understanding these effects can help individuals make informed decisions about their lifestyle choices and fertility health.