The difference between one's age estimated maximum heart rate and resting heart rate is one's _________.

The difference between an individual's estimated maximum heart rate and their resting heart rate is referred to as heart rate reserve (HRR). This concept is important for understanding cardiovascular fitness and the capacity for exercise.

Heart rate reserve measures the range of heart rates that an individual can utilize during physical activity. To calculate HRR, you start with the maximum heart rate—typically estimated by subtracting your age from 220—and then subtract your resting heart rate, which is your heart rate while at rest and typically measured in the morning after a good night's sleep.

This value is crucial for designing exercise programs and assessing fitness levels, as it helps determine the intensity of workouts. The higher the heart rate reserve, the greater the potential for improving cardiovascular fitness and performance through exercise.

In contrast, the other terms do not accurately describe this specific calculation. The anaerobic threshold refers to the point during exercise at which the body switches from primarily aerobic energy production to anaerobic energy production. Glycolytic capacity involves the ability to produce energy without oxygen, particularly through the breakdown of carbohydrates. Submaximal sustainable heart rate relates to the heart rate that one can maintain during prolonged exercise without significant fatigue but does not specifically denote the difference from the maximum heart rate. Thus, heart rate