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The temperature has been around 8° degrees that last few morning but today it was 1.0°. Before beginning my run I walk for 5 minutes as a warm-up and usually I manage to just get into Zone 1 ( 50-60%).
This morning however I had only walked a few paces and I was already at the far end of Zone 1 heading for Zone 2.
Does the cold weather affect the heart rate by increasing it in order to try and stay warm ?. I had a good sleep and everything was normal except for the elevated heart rate. My run was fine but I was 10bpm over my average and yet I felt as though I was breathing running quite easily.