  Smartwatches (SWs) can continuously and autonomously monitor vital signs,
including heart rates and physical activities involving wrist movement. The
monitoring capability of SWs has several key health benefits arising from their
role in preventive and diagnostic medicine. Current research, however, has not
explored many of these opportunities, including longitudinal studies. In our
work, we gathered longitudinal data points, e.g., heart rate and physical
activity, from various brands of SWs worn by 1,014 users. Our analysis shows
three common heart rate patterns during sleep but two common patterns during
the day. We find that heart rate and physical activities are higher in summer
and the first month of the new year compared to other months. Moreover,
physical activities are reduced on weekends compared with weekdays.
Interestingly, the highest peak of physical activity is during the evening.
