Final answer:
The ADMR in 20-50-year-old adults typically ranges from 1.2 to 2.5 times the BMR, influenced by factors like age, gender, muscle mass, and physical activity.
Step-by-step explanation:
In the general population of 20-50-year-old humans, ADMR tends to vary from 1.2 to 2.5 times the BMR. This range accounts for variations due to factors such as age, gender, weight, and physical activity level. It's important to note that BMR naturally decreases with age, with a significant reduction after the age of 30. Furthermore, since men usually have a greater muscle mass and a lower body fat percentage than women, they tend to have a higher BMR. Muscle mass decreases with age, particularly between the ages of 50 and 70, leading to a further reduction in the metabolic rate.