Nevertheless, heart rate readings, optical or otherwise, are estimates and should be used only for reference and recreational use. Currently, the best wrist heart rate measurements stay 90% of the time within 5% of the chest-measured heart rate. However, it's good to keep in mind that the accuracy and reliability of optical heart rate measurement can vary from device to device and from person to person and may not work at all with certain types of activities or sports. It is an easy and convenient way to track your heart rate. Good to know about wrist heart rate measurement In other words, the light entering your body around the wrist will scatter in a predictable manner when the blood flow dynamics change, such as with changes in blood pulse rate and with changes in blood volume, also known as the cardiac output. According to the volume of blood pumped, heart rate is either high or low based on the amount of light returning to the device: the more light, the lower the heart rate and vice-versa. Optical heart rate devices use light to measure the amount of blood circulating through your veins and tissues. It can be any Bluetooth-compatible heart rate strap. In case the data collected doesn't reflect the reality of your training, or you feel a chest sensor would be more appropriate for your type of activity, we recommend using a compatible chest heart rate sensor for more accurate readings. ![]() The accuracy of the optical heart rate measurement is influenced by many factors and can be affected by many individual differences. We offer WHR in the following watch models, from newer to older: Suunto 9 Peak, Suunto 9 Baro, Suunto 9, Suunto 7, Suunto 5, Suunto 3, Suunto 3 Fitness, and in the Suunto Spartan collection, which was our very first collection of wrist heart rate devices. ![]() Many manufacturers provide this technology in many formats and at different developmental stages. This results in you being able to see your heart rate data during your exercise or daily use without using a chest heart rate strap. Wrist or optical heart rate technology, commonly known as WHR and OHR in the community, measures heart rate via your device's LEDs that track blood flow in your wrist.
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