Which statement should guide intensity when monitoring heart rate is unreliable?

Which statement should guide intensity when monitoring heart rate is unreliable?

• A. Rate of Perceived Exertion.
• B. Maximum heart rate.
• C. Shoe size.
• D. Time of day.

Answer: (A)

When heart-rate data isn’t reliable, your best guide is how hard you feel you’re working. Rate of Perceived Exertion (RPE) uses a simple scale to rate effort, which directly reflects your actual exertion and responds to daily factors like fatigue, heat, sleep, and stress. You can set training targets with RPE (for example, moderate effort around 12–14 on the 6–20 Borg scale or a 4–6 on a 0–10 scale) and adjust based on how you feel, breathing, and ability to speak in phrases. In contrast, using a maximum heart rate estimate isn’t dependable day to day for guiding intensity and relies on devices that might be inaccurate. Time of day and shoe size don’t provide a meaningful measure of workout intensity.

When heart-rate data isn’t reliable, your best guide is how hard you feel you’re working. Rate of Perceived Exertion (RPE) uses a simple scale to rate effort, which directly reflects your actual exertion and responds to daily factors like fatigue, heat, sleep, and stress. You can set training targets with RPE (for example, moderate effort around 12–14 on the 6–20 Borg scale or a 4–6 on a 0–10 scale) and adjust based on how you feel, breathing, and ability to speak in phrases. In contrast, using a maximum heart rate estimate isn’t dependable day to day for guiding intensity and relies on devices that might be inaccurate. Time of day and shoe size don’t provide a meaningful measure of workout intensity.