For an obese client in NASM's "stage III" cardio program, what is the expected maximal heart rate (MHR)?

In the context of an obese client in NASM's "stage III" cardio program, the expected maximal heart rate (MHR) is classified within the range of 86-95%. This stage is aimed at improving cardiorespiratory fitness through high-intensity training, which is more effective for fat loss and metabolic conditioning compared to lower intensity options.

Stage III training focuses on working at a higher heart rate zone. In this stage, cardiovascular training protocols involve intervals of higher intensity work, paired with active recovery phases. As the intensity increases, it is essential to operate at a heart rate that challenges the cardiovascular system while still being manageable for the client.

The rationale for why 86-95% MHR is appropriate for this stage lies in the principle of progressive overload, which suggests that to improve physical fitness, individuals must adopt a higher intensity level than they are accustomed to. This range effectively promotes fat oxidation and cardiovascular adaptation, which are crucial goals for weight loss in individuals who are classified as obese.

Lower heart rate ranges—such as those reflecting 65-75% or 76-85% MHR—are more suited for beginner or less intense phases of training, focusing on basic adaptations and comfort. They do not challenge the cardiovascular system