While both systems rely on physical contact to gather their readings, optical sensors tend to be used in arm- or wrist-based systems a smartwatch is rarely worn as tightly as an elasticated chest strap and as such optical systems tend to be more prone to issues over rough terrain, as bumps can briefly break the all-important contact between skin and sensor. These work by shining a light into your skin and measuring the variance in blood flow. Recently, optical sensors have become more common, especially in multi-sport offerings. The electrical sensors measure a small electrical output, and the control unit relays this information to your device of choice. Its similar to what happens when you get an echocardiogram at the hospital, only with two or three sensors instead of the twelve commonly used for medical examinations. ![]() Since its inception in the 1970s, the heart rate monitor has relied on measuring the electrical impulses created by the muscles in your heart as it beats. What’s The Difference Between Ecg And Optical Heart Rate SensorsĮlectrical impulses or beams of light? Which one is best for you? For example, a device with a 5ATM rating can sustain pressures equivalent to a depth of 50 metres. They are most easily defined by multiplying the number by 10, to get the depth at which your device can handle pressure. ![]() The second digit, representing protection against liquid ingress – ie water – is a rating between 0 and 8, and again, the bigger the number the better.ĪTM ratings focus solely on waterproof pressure rating. The larger the number, the better the protection, while an X means it hasn’t been tested. The first digit, representing protection against solids like dust and dirt is a rating between 0 and 6. IP ratings stand for Ingress Protection, and the two subsequent digits represent protection against solids and liquids respectively. ![]() Waterproof ratings are a complex mix of numbers and letters that need a bit of decoding before you can understand their meaning. IPX7, IP67, 5ATM? Can someone please make sense of this In addition, some devices can monitor different data points depending on the type of exercise youre doingfor instance they monitor rhythm and distance while youre running and heart rate variability while youre swimmingwhile other heart monitors track what zone of fat burning youre in, meaning you dont have to do any math. Others can monitor your running stride, record steps, and count calories. Some monitors track your heartbeat and not much else. Best Heart Rate Monitors for Runners: 2021’s best chest and arm straps tested and rated
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