09/12/2026
Four slides, and the last one will annoy some people.
Here is the honest state of the research.
Almost every long-term finding on sauna is sauna only. The 20-year Finnish cohort work on mortality, dementia and stroke. The randomized trial where eight weeks of heat nearly doubled flow-mediated dilation. The depression trial. The headache trial. Not one of them involved a cold plunge. If you only ever sauna, you are doing the thing that was actually studied.
Cold has its own evidence, and it is mostly fast. Five minutes at 68°F raised positive affect and alertness, with matching shifts in prefrontal connectivity (Yankouskaya, Biology, 2023). In 3,018 adults, 30 to 90 seconds of daily cold cut sickness absence 29%, and the 90-second group did no better than the 30-second group (Buijze, PLOS ONE, 2016). Longer is not the point.
Doing both beats doing nothing. Thirteen pooled trials found alternating hot and cold improved soreness and strength loss through 96 hours versus passive rest. The same analysis found no clear advantage over cold alone, warm water alone, compression or active recovery (Bieuzen, PLOS ONE, 2013).
Now the part everyone argues about.
No trial has compared heat first against cold first, head to head. Heat first is tradition, and it makes the cold bearable. Both are good reasons. Neither is a research finding.
The rule about always ending on cold gets attributed to a 2021 winter-swimmer study. That study compared swimmers to non-swimmers. It had no ending-hot arm to compare against.
The one place order is established has nothing to do with which room you walk into. Cold straight after lifting lowered muscle protein synthesis about 20% over the next five hours and blunted size and strength gains across 12 weeks (Fuchs, J Physiol, 2020. Roberts, J Physiol, 2015). Sauna after lifting. Plunge later.
So tell us. Do you start cold or end cold. How long, how cold, how many rounds. What changed your mind. If you finish hot because you sleep better, say that. That counts too.
Sauna for the People®
