Cold showers act as a hormetic stressor: the initial chill kicks your sympathetic “alert” response into gear, then your body rebounds with a surge of parasympathetic activity—stimulating the vagus nerve and releasing mood-boosting neurochemicals.
This is exactly my experience with cold showers, I wrote about it here:
#999664
This blog post appeared on my oura app today.
This is exactly my experience with cold showers, I wrote about it here: #999664