Basal Metabolic Rate:
It is the rate of energy expenditure by humans and other animals at rest. It measured in KJ per hour kg body mass. Rest is defined as existing in a neutral temperature environment while in the post-absorptive state.
Your BMR (Basal Metabolic Rate) is an estimate of how many calories you’d burn if you were to do nothing but rest for 12 hours. It represents the minimum amount of energy needed to keep your body functioning, including breathing and keeping your heart beating. Factors that affect your BMR include age, genetics, weight, heredity, body fat percentage, and gender.
Example: Your BMR is the number of calories your body would need to spend 24 hours asleep in bed. your BMR number will depend on many factors, such as your weight, your diet, and your current activity level.
An average BMR usually translates to about half a calorie per pound of body weight an hour (1 pound = 453592 kg). In men, this is a BMR of between 1600 and 1800 kilocalories in a day while the BMR of women is at most 1500 kilocalories per day.