30/03/2026
🧊 Are cold plunges good or bad ?
The data is actually pretty strong but the protocol matters more than most people realise.
A 2025 meta-analysis in PLOS ONE (3,177 participants) found cold water immersion produces real, measurable reductions in stress, inflammation, and sick days alongside improved sleep and quality of life.
Here’s what’s actually happening in your body:
→ Norepinephrine spikes up to 530% above baseline
→ Dopamine rises up to 250% — lasting 2–3 hours post-plunge
→ Post-immersion vasodilation flushes metabolic waste & boosts oxygen delivery
→ Brown fat activation = improved metabolic health over time
→ Parasympathetic nervous system dominance (rest & recovery mode)
📋 Two evidence-based protocols depending on your goal:
🔬 Recovery Protocol (research consensus)
• Temp: 11–15°C
• Duration: 10–15 minutes
• Timing: Post-training
• Best for: DOMS, muscle recovery, inflammation reduction
⚡ Performance Protocol (Huberman)
• Temp: 10–15°C (personally targets 7–12°C)
• Duration: 1–5 minutes — total of just 11 mins/week across 2–4 sessions
• Timing: Morning, before training — never within 4–6 hours of strength work or you’ll blunt hypertrophy
• Don’t towel off — shiver to activate brown fat thermogenesis (the Søberg Principle)
• Best for: Dopamine, focus, stress resilience, metabolism
Personally I prefer the Huberman approach — same benefits, fraction of the time. 11 minutes a week is a no-brainer.
💬 Which protocol are you using? Drop your temp and time below 👇