Final answer:
The Rating of Perceived Exertion (RPE) is a subjective scale used to measure exercise intensity based on an individual's personal perception of effort.
Step-by-step explanation:
The term for when individuals can regulate intensity based on personal perception of effort is b) RPE (Rating of Perceived Exertion).
Rating of Perceived Exertion (RPE) is a scale used to measure the intensity of exercise based on how hard an individual feels they are working, which can be subjectively assessed by the individual themselves. This method acknowledges that different factors, such as medications, can affect objective measures like heart rate, making personal perception a valuable tool for assessing exertion levels. The Centers for Disease Control and Prevention (CDC) recommends using RPE as it gives a more complete view of an individual's actual exertion level during physical activity. RPE can therefore be helpful not only in gauging exercise intensity but also in pain management strategies.