Originally Posted by
dennisa
Force of habit I always wear my HRM when I ride. So I happen to have the data for today's ride, which was a short commute to work.
I have noticed the same, higher heart rate and significantly slower speeds for similar routes. I thought it secondary to the inertia of layers, additional weight from clothes, care in downhill runs, warm up time. Also mentioned was increased resistance from increased density of cold air, a factor I had not considered.