Heart rate is the beats per minute of the heart that depicts the blood flow per cycle. The wrist monitor tracks heart rate during exercises and workouts. Thus, option D is correct.
Technologies are the introduction of the devices and instruments that can help and make the task easy. They are used in medical and health industries to track the fitness of the person.
The health devices like the pedometer and wrist monitors are used to track the heart rate, oxygen level, steps, blood glucose, etc. They track the heart, lungs, and brain activities.
The wrist monitor uses photoplethysmography to measure the heart rate through the sensors placed at the forearms and wrists. It estimates the heartbeat of the person working out by the optical sensors.
Therefore, the wrist monitors track the heart rate.
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Your question is incomplete, but most probably your full question was, Which technology keeps track of heart rate during a workout? (3 points)
