{"product_id":"heart-rate-monitor","title":"Heart-rate monitor","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe sauna looks passive. Your cardiovascular system disagrees. Research on Finnish sauna bathing found heart rates during sessions comparable to moderate-intensity exercise — sitting still, doing nothing, at 120–150 bpm. A heart rate monitor is how you actually see that load instead of taking our word for it.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eCold works the other way. Immersion triggers the cold-shock response — a sharp initial spike as the sympathetic nervous system fires, then a settling as you adapt. Watching that settling happen across weeks of practice is one of the clearest ways to see adaptation in real numbers.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eBetween sessions, the same data tells you when to push and when to back off. Heat and cold are both stressors; the point is dosing them, and heart rate is the most accessible gauge you have.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eDelivered Australia-wide.\u003c\/p\u003e","brand":"xcelance_dev","offers":[{"title":"Default Title","offer_id":42754063302741,"sku":null,"price":130.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0655\/6385\/2885\/files\/heart-rate-monitor-7002954.webp?v=1785841386","url":"https:\/\/www.enhancedhuman.com.au\/products\/heart-rate-monitor","provider":"Enhanced Human","version":"1.0","type":"link"}