Сообщение от
Ray Maker
Finally, a few quick caveats on optical heart rate sensors. The first is that no optical HR sensors on the market today accurately measure heart rate variability (HRV/RR). This data is often used by watches (such as Garmin, Suunto and Polar) to estimate certain metrics – such as calories burned, VO2Max data, and recovery time. The technology in today’s optical sensors (regardless of brand) is simply unable to accurately gather this required data. Instead, optical sensor companies attempt to guesstimate these values.
In many cases, the resulting numbers actually work out just fine – and all is well for 3rd party watches. However, do keep in mind that results can vary. For me, I’ll get some runs where the recovery time compared to a traditional HR strap is virtually identical, and then yet other runs where it’s significantly different. This is normal for where the technology is today. Note this doesn’t impact the standard beats per minute (BPM) metric, but only the data used to feed into advanced analysis. This is true of virtually all devices that leverage this information, on both ANT+ and Bluetooth Smart, across a number of vendors including Garmin, Suunto, Polar, and others.