What concept is used to monitor training by dividing effort into heart rate–based zones?

• A. RPE scales
• B. Heart rate zones
• C. VO2 max
• D. Lactate threshold

Answer: (B)

The concept is using heart rate to divide effort into zones to guide training intensity. By tracking your heart rate during exercise and relating it to your maximum (or heart rate reserve), you create distinct effort bands that map to different adaptations—easy recovery work in the lower zones, steady aerobic work in the middle zones, and high-intensity efforts in the upper zones. You typically monitor and adjust training using a heart rate monitor, setting zones as percentages of max HR or HRR, and you work within these zones to target specific outcomes, monitor progression, and balance workload.

RPE scales rely on how hard the effort feels to you, which is subjective and not based on physiological data. VO2 max is a measure of maximal oxygen uptake, not a zone-based framework for everyday training. Lactate threshold indicates the intensity at which lactate starts to accumulate rapidly, informing training but not, by itself, the system of heart rate–based zones used to monitor and structure regular sessions.