Oxygen levels in your blood can change with heart and lung function, activity, and altitude
The number of times the heart beats in a minute, based on electrical signals
How often the heart pushes blood through your body, which can change with general health, physical activity, and with your mental or emotional state (e.g., stress, anxiety)
A calculation of the relative strength of your pulse, which changes based on your circulation
A simple and noninvasive measurement of your heart’s electrical activity. The average heart rate is typically 65-100 beats per minute