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Wearable devices and smartwatches provide high-resolution activity data that reveal health benefits from even small, frequent bouts of movement. Regular short periods of activity reduce all-cause mortality risk and confer protection against coronary heart disease, with benefits accumulating across the day. Accelerometer-based measures also show widespread sedentary behavior and quantify its associations with adverse outcomes. These data refine understanding of dose–response relationships, indicating that some activity is better than none and that traditional weekly-duration targets can be complemented by guidance emphasizing frequent interruptions of sitting and more total daily movement.
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