Single-use code, sent to your email.
Send my code →Heat drives your heart like a workout. Cold floods the system with noradrenaline. Both are dose-dependent on temperature, and both are measured, not claimed.
Drag the temperature. At peak heat, heart rate reaches about 150 bpm, the cardiovascular load of moderate exercise, while you sit completely still. The science ↗
After an hour in 14°C water, noradrenaline rises around 530%, and stays elevated long after you step out. The science ↗
Figures reflect the cited studies; individual responses vary with temperature, duration and the person. Heat-dial values are illustrative of the dose-response Laukkanen describes (~100 bpm in a moderate session, up to ~150 bpm in intense heat, comparable to low-to-moderate exercise).
Noradrenaline, dopamine, and what the research really shows.
120–150 bpm, sitting still, the load of heat.
Sauna and plunge, without the five-figure price tag.
Fewer sick days, but not for the reason you think.
