Pulse rate or the number of heartbeats per minute. The tracker evaluates the duration of each pulse wave, calculates the instant pulse rate, and determines the average value based on the test results.

Normally, this value varies from 60 to 90 bpm and may change significantly throughout the day, depending on physical loads, kind of activity, and general well-being. In many ways, the pulse rate of healthy people depends on the level of physical development and body fitness. Therefore, the pulse rate from 60 to 70 beats per minute at rest bespeaks a good level of fitness. In professional athletes and persons actively engaged in fitness activities, the heart rate may fall below 60 beats per minute, which is considered normal in such cases. Persons who are physically inactive, overweight, or obese may have a pulse rate of 80 beats per minute or more. It's important to note that depending on the external factors, the pulse rate may fluctuate over a wide range extending far away from the normal values. During sleep, the pulse rate may be less than 60 beats per minute; during significant physical activity, it may climb up to 120-140 beats. With this in mind, at the initial evaluation, make sure the test was carried out in comfortable conditions, in a relaxed state.

Don't draw conclusions from one-time measurements if the results are lower or higher than the normal values. Keep assessing the tendencies for a few days or even weeks. For this, the tracker's trend monitor functions may come in hand. Take measurements during a period of quiet wakefulness—e.g., the morning, after a night's sleep. Evening readings may be somewhat worse than the true values, influenced by after-work effects such as stress, fatigue, wearing uncomfortable shoes or clothing, etc.

Changes in the pulse rate after which it falls under 60 or rises over 90 beats per minute may in some times be congenital, caused by the individual features of the cardiovascular system. All the more reason not to worry if deviations from the norm are minor, from 90 to 100 or 50 to 60 beats per minute, and recorded sporadically. Significant fluctuations in heart rate can be associated with serious diseases of the cardiovascular and endocrine system. If there is a persistent tendency for the pulse rate to fall below 60 or to increase above 90 beats per minute, you should consult a doctor—especially if changes in pulse rate are accompanied by other complaints, such as weakness, feeling faint, fainting, or palpitations, sweating, shaking hands, etc. In addition, at the initial stage of the examination, a competent analysis of the electrocardiogram can provide essential information regarding the heart function.

You can obtain more reliable fitness state data after doing some stress tests.

Here's a procedure you can follow:

1. Measure your pulse rate at rest.
2. Do 20 squats in 30 seconds.
3. Three minutes later, measure your pulse rate again and calculate the difference between the values.

Results explained:

1. good fitness level: difference under 5 bpm
2. satisfactory fitness level: difference of 5 to 10 bpm1. satisfactory fitness level: difference of 5 to 10 bpm
3. poor fitness level: difference over 10 bpm