30/07/2026
There's a genuinely interesting piece out on heat training and what it does to endurance capacity. Worth a few minutes if you train through the heat or already use sauna.
The core finding: heat exposure raises haemoglobin mass, the part of blood that carries oxygen around the body. In trained athletes, that number tends to line up with VO2 max. Reasonable enough on its own.
The part people miss is speed. This isn't a two-week fix. Researchers describe it more like creatine than caffeine, a small shift that adds up over months rather than something you feel by next Tuesday.
Worth knowing if you've tried heat training, seen no change on a test, and quietly written it off. The adaptation may still be happening. It's just slower than the testing window most of us use.