HEART-RATE SETTINGS
What changes when you update your maximum heart rate?
Changing a setting can change the label attached to an old run. It does not change the heart rate that was recorded.
Separate a measurement from a setting
A run recorded at 140 bpm remains a run recorded at 140 bpm after you edit your maximum-heart-rate setting. What may change is the percentage or zone assigned to that value. Keep both pieces of information when reviewing a chart: the recorded measurement and the method used to classify it.
Use a reliable maximum if one is available. An age-based equation is a population estimate, not a measurement of your own maximum; the Tanaka study linked below concerns an age-prediction model in healthy adults. Changing a setting simply to make a difficult run look easy makes the classification less useful.
Calculate the change before saving it
The numbers in this example are illustrative, not a customer training record.
| Method | Maximum 180 | Maximum 190 |
|---|---|---|
| Percentage of maximum: 60% | 108 bpm | 114 bpm |
| Percentage of maximum: 70% | 126 bpm | 133 bpm |
| Reserve, resting 50: 60% | 128 bpm | 134 bpm |
| Reserve, resting 50: 70% | 141 bpm | 148 bpm |
In both methods, raising the maximum by 10 bpm moves the 60% boundary by 6 bpm and the 70% boundary by 7 bpm. The resting value changes the absolute location of the reserve-based boundaries. This is why two methods can move in parallel while still assigning different labels to a recorded heart rate.
Record the convention as well as the number
The public calculator uses five bands covering 50–100%, with whole-number ranges that do not overlap. A 70% boundary belongs to the higher band. If another app includes the boundary in the lower band, one bpm can appear under a different label even when the arithmetic matches.
Write down the maximum, resting value, method and date of the settings change. Before comparing time in zones across months, check whether the software recalculates older activities or retains the original classification. Do not assume either behavior without checking that product.
Check both methods with the same inputs
Enter 180 and 50 in the heart-rate zone calculator, then change only the maximum to 190. Repeat using percentage of maximum. Keeping the same input change in both views makes the effect visible.
Use the reserve-versus-maximum guide when you need the underlying equation. The resulting boundaries organize the data; they do not establish physiological thresholds or tell you how hard to train today.