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HRM straps and breast movement
(self.running)
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this post was submitted on 11 Jan 2025
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On really long races with a backpack, my HRM strap has often got nudged down so it's practically round my abdomen, and it still worked fine. Why don't you give it a go much lower and see what happens? That might help settle the breast question?
So, it didn't really seem to make a great deal of difference, but I'm not sure if I was able to get the band low enough. I had it right at the bottom of my sternum, but couldn't go lower without it being weird and uncomfortable. And when it was still on my sternum, it was still partly under my bra, so there was likely still movement impacting it...
Can't hurt to try I guess! I'll give it a go
You could also try tightening the band a small amount to see if that reduces the oscillation measurement. You could also take a video of yourself running to confirm or deny what the strap is saying about your form.