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I don't have any scientific advice for you, just personal experience. I had major scoliosis surgery about 5 years ago so I have a very temperamental back and while I just started running ( just a 14K last weekend) I know what you are talking about. Usually when my back starts to hurt consistently after a good workout I…
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I have a FT4 and the same thing happened to me. When I tightened the chest strap considerably and just started swimming real laps, not the easy laps that I was checking if the heart rate monitor was working, it started to pick up the signal. My feeling is that it was easier for it to read my heart rate as it picked up.…
