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HRM straps and breast movement (lemmy.blahaj.zone)

submitted 3 weeks ago by [email protected] to c/[email protected]

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I'm seeing weird results with my heart rate strap. My ground contact time is really low, but my vertical oscillation is really high! One indicates good form, the other indicates bad form. My subjective experience is that my vertical oscillation is low, but my garmin disagrees.

And I think the reason why is the movement of my breasts. I think they're moving the sensor itself, and confusing its measurements.

Is that actually a thing? I've tried to find research or people talking about it, but all I can find is discussion on the impact of breasts on actual running performance, rather than on the measurement of it.

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[–] [email protected] 0 points 3 weeks ago

It's not my heart rate measurement that has the issue. The device has an accelerometer in it to that measures running movement metrics, so it can determine things like stride length, vertical movement with each stride, ground contact time, and the ratio of time spent on each foot. What I think is happening is that because of the positioning of the strap, just below the breast crease, incidental breast movement is moving the strap and sensor enough to impact the accelerometers measurements.