Originally Posted by
myrridin
I suggest you do some research on hypothermia. It doesn't require freezing temperatures. And getting wet (from rain) can accelerate the onset.
Actually I have. I used to work in medical software development, and as such I have access to a lot of medical research databases. There has been, in my searches, no occurrence of healthy, active adults developing hypothermia while performing aerobic activity. Is there evidence of this occurring? Maybe, but I have not found it.
I know from my own experience and experiments that wearing minimal cover, above freezing, maintaining heart rate at or above 110 BPM, temps 32F and up, rainy and wet, 36 mile commute each way... no hypothermia. Hands and feet get a little achey, but that is it.
Everybody's relative climatic stress is different, but it's my opinion that most people would be quite surprised if they just gave it a try.