Heart rate is most accurately recovered from the chest
The heart rate monitors of MOST activity bracelets work with a technology called pulse oximetry. Infrared light that penetrates the skin measures subtle changes in the color of the blood.
The colors indicate the amount of oxygen in the blood that increases as the heart rate rises; There is a need for oxygen and energy as the heart pumps faster. Thus, the device typically also assumes that you are engaged in an activity that consumes energy.
However, many other factors can also affect the level of oxygen in the blood or otherwise alter the appearance of blood vessels.
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For example, when you lift weights, muscle contractions change the amount of blood that travels to your limbs. This is reflected in the dilation of blood vessels.
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In this case, the heart rate belts used on the chest measure more accurately than the devices used on the wrist.
WHAT DO THE STUDIES SAY? In terms of heart rate measurement accuracy, active bracelets have performed well in some studies.
Journal of Personalized Medicine A study published in 2017 showed that with six devices, the margin of error in heart rate measurement was
less than five percent. The devices studied were AppleWatch, BasisPeak, FitbitSurge, MicrosoftBand, MioAlpha2, PulseOnjaSamsungGearS2.
ConsumerA survey conducted by the magazine in 2019, on the other hand, revealed that the bracelets of the cheapest caste did not measure heart rate very accurately.
Do you measure sleep or immobility?
THERE ARE UNIT METERS for many outputs: in addition to those that can be threaded on the wrist or finger, there are devices that are placed under the mattress.
Some systems report wakefulness, light sleep, REM sleep, and the amount of deep sleep.
The best sleep meters monitor movement and heart rate during sleep. Some devices include features that also monitor environmental factors, room temperature, and lighting.
VTT’s Development Manager Teppo Valtonen according to it, in addition to motion and acceleration sensors, the sleep meter should have a heart rate measurement. For heart rate variation gives you some more information about sleep.
The challenge here too is the individuality of the people.
– The heart rate variation does not necessarily give everyone a good answer for identifying different stages of sleep, Valtonen points out.
WHAT DO THE STUDIES SAY? In 2019, TTL researched sleep meters, which were the Oura ring, Emfit and Polar, on Yle’s behalf.
The devices measured the total amount of sleep well, but based on this study, the user should be wary of the measured amount of blink. It is also essential to realize that these devices do not measure sleep directly, they measure inactivity and interpret this as sleep.
Calorie measurement is not possible with home brackets
SMART EQUIPMENT may tell your heart rate relatively accurately, but their results can fluctuate a lot when measuring calorie consumption.
Journal of Personalized Medicine A study published in the magazine revealed that the result of even the most accurate device in terms of calorie consumption threw 27 percent and the least accurate 93 percent.
Similar errors were found Consumerin a study published in 2019.
The best devices use complex algorithms that analyze motion and change the pulse interpretation accordingly.
A meta-analysis of 60 studies published by the University of Leeds in 2018 shows that devices are more accurate in calorie measurement if they also interpret body heat.
According to Valtonen, it is very difficult, if not impossible, to get an accurate result with the current meters.
This is because calorie consumption is difficult to measure.
Respiratory gas measurement has been the golden standard, but it cannot be done with very light equipment.
– For example, methods based on movement, acceleration and heart rate alone are only indicative at best, Valtonen points out.
Expert: Teppo Valtonen, Development Manager, TTL.
This article appeared in Good Health. As a subscriber, you can read all numbers free of charge from the digilehdet.fi service
Source: Hyvä Terveys by www.hyvaterveys.fi.
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