Basal metabolic rate be elevated in stress, illness, and diabetes. Menopause may also affect metabolism. Heart rate is determined by the medulla oblongata and part of the pons, two organs located inferior to the hypothalamus on the brain stem. Heart rate is important for basal metabolic rate and resting metabolic rate because it drives the blood supply, stimulating the Krebs cycle. During exercise that achieves the anaerobic threshold, it is possible to deliver substrates that are desired for optimal energy utilization. The anaerobic threshold is defined as the energy utilization level of heart rate exertion that occurs without oxygen during a standardized test
Heart rate factors in resting heart rate (HR) to calculate target heart rate (THR), using a range of 50–85% intensity: Equivalently, "Example for someone with a HR of 180 and a HR of 70 (and therefore a HR of 110):" An alternative to the Karvonen method is the "Zoladz method", which derives exercise zones by subtracting values from HR: "Example for someone with a HR of 180:" "Heart rate recovery" (HR) is the reduction in heart rate at peak exercise and the rate as measured after a cool-down period of fixed duration. A greater reduction in heart rate after exercise during the