What percentage does the upper end of THRZ equate to when calculating using MHR?

To determine the upper end of the Target Heart Rate Zone (THRZ) using Maximum Heart Rate (MHR), it is essential to establish a clear understanding of how heart rate training zones are typically defined.

Generally, the Target Heart Rate Zone is calculated as a percentage of your Maximum Heart Rate, which is commonly estimated using the formula 220 minus your age. The heart rate training zone can be divided into different ranges denoting light, moderate, and vigorous activities. The upper end of the THRZ usually reflects a vigorous intensity level recommended for enhancing cardiovascular fitness.

In this context, the upper end of the THRZ is conventionally set at 85% of MHR for individuals aiming to achieve effective training benefits. This level maximizes the efficiency of cardiovascular workouts while also promoting improvements in aerobic capacity and endurance without overtraining.

Thus, when evaluating the choices provided, the correct answer aligns with the recognized standard for vigorous intensity exercise, which is effectively represented by 85% of MHR. This significant threshold indicates the minimum heart rate level at which substantial fitness benefits can be expected during exercise.