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HRM PRO abnormally high values during first minutes

tekosta
over 4 years ago

Seeing that the oscillometer of my new Fenix 6s pro unfortunately does not give reliable measurements, I bought the HRM PRO strap as well. But it seems that this, too, the first 8 minutes shows very high values and then returns to normal levels. Having already experienced from my previous watch a fenix 5s in combination with the HRM DUAL strap, I made a 10 km ride while wearing both of these sets. It is clear that in the first 8 minutes, HRM PRO shows abnormally high values, while HRM DUAL shows a smooth increase. After 8 minutes these two straps show the exact same measurements. My question is which strap gives the correct measurements in the first 8 minutes and whether the measurements of those 8 minutes of HRM PRO affect the final measurements.

Attached photo ( top HRM DUAL, bottom HRM PRO)

 

 

  • 0 over 4 years ago

    I find that the fabric straps are extremely sensitive to static, particularly if you're wearing a synthetic (polyester/nylon) t-shirt.  Soaking the strap and/or your shirt should damp down the spurious readings.  I find that wearing a cotton or merino wool t-shirt helps immensely.

    Unfortunately, if you run in warm & dry conditions, the problems can come back after things dry out. Sometimes I find that running in breezy conditions with a synthetic top is just unusable.