Fat burning heart rate

The image shows a “heart rate fuel profile” chart, which illustrates the relationship between heart rate (horizontal axis) and the utilization of energy sources (fat and glycogen, vertical axis).

Fat burning

Fat burning increases as the heart rate rises, reaches its peak at a certain point (around a heart rate of 120-130), and decreases thereafter.

Glycogen utilization

Glycogen utilization increases steadily with a rising heart rate, becoming particularly dominant in higher heart rate ranges.

Crossover

The fat and glycogen utilization curves cross each other, indicating the point where the usage of one energy source becomes dominant over the other.

Heart rate zones

Based on the graph, it can be observed that during lower-intensity workouts, fat burning is dominant, while during higher-intensity workouts, glycogen utilization becomes the primary factor.

Summary

The “heart rate fuel profile” chart illustrates how the ratio of energy sources used by the body (fat vs. glycogen) changes as a function of heart rate:

Fat burning

As heart rate increases, fat burning also rises, then reaches its maximum at a heart rate of approx. 120-130, after which it gradually decreases.

Glycogen utilization

This energy source becomes increasingly dominant as the heart rate rises, especially during higher-intensity (higher heart rate) workouts.

Crossover point

There is a point (usually around a heart rate of 120-130) where the rate of fat and glycogen utilization is equal; from here, glycogen becomes the primary energy source.

Heart rate zones

At lower intensity (lower heart rate), fat, and at higher intensity (higher heart rate), glycogen usage becomes the determining factor.

In addition to showing the fat-burning heart rate, this Smartwatch can continuously monitor more than 60 health and fitness indicators.