What does the Rate Pressure Product (RPP) measure?

The Rate Pressure Product (RPP) is a valuable measurement used in exercise physiology to assess the myocardial oxygen demand. Specifically, it is calculated by multiplying heart rate by systolic blood pressure. This calculation reflects the overall workload on the heart and the amount of oxygen the heart requires during physical activity.

When heart rate increases, or when blood pressure rises, the RPP indicates that the heart is working harder to supply blood and oxygen to the tissues in the body, particularly the myocardium (heart muscle). Therefore, option B correctly identifies that RPP measures heart rate and myocardial demand, highlighting its relevance in evaluating cardiovascular efficiency and stress during various intensities of exercise.

In contrast, the other options do not accurately represent the focus of RPP. Stroke volume and blood volume pertain to different aspects of cardiac function. Calories burned during exercise relates to energy expenditure, and body mass and muscle tone are more related to overall fitness rather than the specific myocardial workload measured by RPP.