Dopamine in movement. A part of the brain called the basal ganglia regulates movement. Basal ganglia in turn depend on a certain amount of dopamine to function at peak efficiency. The action of dopamine occurs via dopamine receptors, D1-5. Dopamine reduces the influence of the indirect pathway, and increases the actions of the direct pathway within the basal ganglia.
In general terms, your THR is 60-80% of your maximum heart rate. You can either estimate what your THR is based on your age, or calculate it effectively by using the Karvonen or Zoladz method. Whichever way you do it, remember the THR is measured in beats per minute (bpm).
Simply put, the more your heart rate increases, the more calories you burn. To find your maximum heart rate, subtract your age from the number 220, as recommended by the Centers for Disease Control and Prevention. For example, if your age is 35, your maximum heart rate is 185 beats per minute.