One of the Most Shared Claims About Ice Baths
The answer is more nuanced than most influencers want to admit.
What the Research Actually Shows
The direct effect is mixed. Studies specifically examining testosterone during cold exposure show:
A study published in the European Journal of Applied Physiology found that testosterone levels temporarily rose immediately after cold water immersion – but returned to baseline within 30–60 minutes. That's not the chronic elevation often claimed on social media.
Indirect support: Cold exposure may indirectly support testosterone levels via:
- Better sleep – Testosterone is produced mainly during deep sleep. Cold water improves sleep quality, which may positively affect testosterone production.
- Lower cortisol – Cortisol (the stress hormone) and testosterone compete for the same precursors. Regular cold water immersion lowers chronic cortisol levels, potentially giving testosterone more "room".
Cortisol – The More Reliable Effect
While the testosterone effect is uncertain, cold water's effect on cortisol is more consistently documented. Acute cold exposure momentarily raises cortisol – a stress response. But regular cold exposure lowers chronic cortisol levels according to several studies.
Lower chronic stress = better hormonal balance overall.
Read about ice baths and stress management for more on cortisol regulation.
