29/08/2025
Cold Water & The Nervous System: What Really Happens
I know this isn’t going to go down well…
I’m going against the stream here.
Because truthfully—I LOVE the water. Even in winter. The river, the loch, the sea.
I’ve dipped in Glencoe in February, winds biting at my skin, and yes—it was incredible. For a moment I felt electric, alive, unstoppable.
But… a few hours later, my body told me another story. I was exhausted. My nervous system felt like it had run a marathon it never trained for.
🔬 The Science Behind It
Cold Shock Response → That first plunge triggers the fight-or-flight system: rapid breathing, heart racing, blood pressure soaring. Survival mode, not serenity.
Neurochemical Surge → Cold immersion spikes norepinephrine and dopamine. That’s the “buzz,” the clarity, the natural high. But it’s stimulation, not true regulation.
The Come Down → Even after leaving the water, your core temperature can keep dropping. That’s why you can feel shaky, flat, or drained for hours afterward.
Mixed Evidence → Some research points to improved vagal tone over time. But for those with stress, trauma, or autoimmune conditions, cold plunges can tip the system into more dysregulation instead of healing.
⚖️ The Balance
Cold water isn’t bad.
But it isn’t a magic cure-all either.
It’s a stressor. A powerful one. For some, it’s resilience training. For others, it’s too much.
I’ll always love the water, even in winter. But I’ve learned not to mistake adrenaline for healing. My nervous system needs safety, rhythm, trust—and sometimes that comes not from ice, but from gentler practices: breathwork, somatic movement, yoga nidra. It's about learning about what your body needs. Gently
✨ Cold water can wake you up. But it won’t regulate you. Healing comes from balance, not shock.