I live in southern Ontario, where we get about 45 minutes of Spring and go from 7 to 30 degrees with 90% humidity, seemingly overnight. This tends to happen just as B and R sessions are longer and more important for my race.

Unfortunately, I just don't spend enough consistent time outside to really acclimate through work and exposure to the heat. I'll put in the outdoor time and work that comes as a part of training, but the intervening time - living', sleep, and paid work - are all spent in nice, cool AC settings, and I think these undermine or reverse any naturally occurring heat adaptations. (I have, however, been able to achieve or experience adaptations before travelling to hot races through a protocol of sauna time, followed by about 7-10d in the warm weather destination).

Any thoughts (or, pointers to published research) on how I can manage this? or more to the point, how I can reduce the heat impairment that affects so many of my sessions once the weather turns hot? (besides 'get skinny and don't get old.')

(The ideal for me would be to arrive at week 1 of a 12-week period acclimated, and staying that way, while continuing to work, sleep, etc in a normal setting.)

Thanks!