Just a thought here and please ladys tell me if I am wrong, but could it be because you are not eating enough and you are burning up to many cal with your workout? I find that if I haven't eaten good cals before and during a long workout (ie. longer than 1 1/2 hours) and eat something right after I get off the bike, even though I get out of sweaty clothing I get cold like this even if its warm out. Input anyone???
Dea