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The Borg Rating of Perceived Exertion (RPE) scale is a valuable tool used primarily to help patients self-assess their level of exertion during physical activities, particularly exercise. This subjective measure allows individuals to rate how hard they feel they are working—taking into account their physical sensations, including effort, fatigue, and breathlessness. By utilizing this scale, patients can communicate their perceived exertion level to healthcare professionals, enabling trainers and therapists to tailor exercise programs that are appropriate for the individual's fitness level and progression.

The ability to self-monitor exertion also empowers patients to take an active role in their rehabilitation and can enhance their motivation and adherence to an exercise regimen. Furthermore, using the RPE scale aids in ensuring safety, as individuals can adjust their exercise intensity based on their perceived exertion, minimizing the risk of overexertion or injury.

While heart rate zones and caloric expenditure calculations are valuable metrics in exercise science, the primary function of the RPE scale focuses on personal perception of effort rather than these objective measures. Additionally, the measurement of electrical activity of the heart, typically done through an electrocardiogram (ECG), does not pertain directly to the RPE, emphasizing the unique role of this scale in assessing