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![bryan_johnson Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::17468569.png) Bryan Johnson [@bryan_johnson](/creator/twitter/bryan_johnson) on x 625.9K followers
Created: 2025-07-10 12:30:49 UTC

Sauna heat devastated my swimmers. 
Seems icing the balls is a good idea. 

No ice protection on the boys: 
+ XX% drop in motile count
+ XX% drop in motility
+ XX% drop in normal morphology

Conversely, my fertility markers improved from my pre-sauna baseline after XX sessions with ice on the boys:

+ total motile count ↑ XX%
+ concentration ↑ XX%
+ motility ↑ 16%,
+ morphology ↑ XX%

This aligns with the evidence. Human testes operate 2-4°C cooler than core temp. Even a +2°C rise (from sauna, hot tubs, laptops, etc.) can derail spermatogenesis for 74-days, the length of a full spermatogenic cycle.

What studies show:

+ A single sauna or hot bath at 80-90 °C can drop progressive motility 40-60% two months later.

+ Scrotal cooling devices used in varicocele (overheated testicles from enlarged veins) treatment restore sperm health within XX days.

A future question we want to address: did my sperm biomarkers improve because of the combination of sauna and ice pack? Or would an ice pack alone deliver similar results?

My sauna protocol is XX min daily at 200°F.

![](https://pbs.twimg.com/media/GvfvTQCWUAAlSox.jpg)

XXXXXXX engagements

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**Related Topics**
[sauna](/topic/sauna)
[bryan johnson](/topic/bryan-johnson)

[Post Link](https://x.com/bryan_johnson/status/1943286786299695196)