Which equation represents the calculation for Target Heart Rate (THR)?

The correct calculation for Target Heart Rate (THR) is represented by the first equation. This formula effectively combines an individual’s resting heart rate (HR rest), maximum heart rate (HR max), and the desired exercise intensity to determine the target heart rate at which one should aim during physical activity for optimal cardiovascular benefits.

This approach is based on proper assessment of both the maximum and resting heart rates, allowing individuals to tailor their exercise intensity according to their fitness level. The formula begins with the resting heart rate and then adds a portion of the difference between maximum heart rate and resting heart rate, scaled by the desired intensity level as a percentage (usually expressed as a decimal between 0 and 1).

Using this formula ensures that the THR is personalized, making it suitable for individuals of varying fitness levels to effectively train within their cardiovascular capacity. Thus, this method is essential for guiding individuals towards achieving their fitness goals while maintaining safety during exercise.