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Several factors can affect heart rate, including air temperature, stress level, alcohol or caffeine intake, immune response to illness, and medication use. Exercising in cold weather can make it more difficult for your device to track your heart rate, as environmental conditions can affect skin perfusion (the amount of blood that flows through your skin). Spikes in your heart rate during sleep may be caused by sudden movements (for example, waking up and getting out of bed), or a weak signal due to wrist placement. Review our tips in How do I improve the accuracy of a heart-rate reading?
For any concerns about your heart-rate data, contact your physician.
Hope you find this information helpful.
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