How are MET values useful for evaluating physical activity?

• A. They categorize activities by duration.
• B. They provide a measure of exercise intensity.
• C. They analyze the psychological impact of exercise.
• D. They detail nutritional needs post-exercise.

Answer: (B)

MET values, or Metabolic Equivalent of Task values, are an important tool for evaluating physical activity because they provide a standardized measure of exercise intensity. One MET is defined as the energy cost of sitting quietly, which is approximately equal to a person's resting metabolic rate. By using MET values, individuals can assess how many times more intense an activity is compared to resting.

For instance, activities with higher MET values, such as running or vigorous cycling, require significantly more energy than activities with lower MET values, like walking or light stretching. This ability to quantify intensity allows individuals to tailor their exercise regimens according to fitness goals, whether it be for weight loss, endurance, or overall health improvement.

While categorizing activities by duration, analyzing the psychological impact of exercise, and detailing nutritional needs post-exercise are all relevant aspects of a fitness program, they do not directly relate to intensity, which is central to understanding how hard one is exercising and thus how effective an activity is for cardiovascular fitness and calorie expenditure.