The average energy requirement for breastfeeding females is defined as that needed to maintain a healthy body weight, reasonable levels of physical activity and sufficient breastmilk production. After delivery, exclusive breastfeeding is recommended for the first six months of a baby’s life. Increases in BMR correlate closely with gestational weight gain. Therefore, for a 35 year old male who is 83 KG, 170cm tall and moderately active:ĭaily calorie requirement = 1815 x 1.5 = 2722.5įor a 35 year old female who is 65 KG, 162cm tall and fairly sedentary:ĭaily calorie requirement = 1405.5 x 1.2 = 1686.6īMR increases during pregnancy, by approximately 5, 10 and 25% across the first, second and third trimester respectively. Most adults have an activity factor in the range of 1.2 (sedentary) to 1.5 (moderately active). The resulting value can then be modified by an activity factor to determine the daily calories required to maintain current weight. Females: BMR = 655 + (9.6 × weight in kg) + (1.8 × height in cm) – (4.7 × age in years).Males: BMR = 66 + (13.7 × weight in kg) + (5 × height in cm) – (6.8 × age in years).kg) To be measured accurately, BMR should be taken in a temperature controlled, laboratory or clinical setting when a person is awake, inactive and postabsorptive (defined as the period of time that follows digestion and absorption of food by the body).Ī person’s BMR can also be estimated using the Harris-Benedict formula:.It is expressed as ml O2/min or joule per hour per kg body mass J/(h Metabolic rate is usually measured by calculating oxygen consumption or carbon dioxide production via indirect calorimetry. A person’s BMR is also partially dependent on their genes, meaning that you can be genetically susceptible from birth to having a low or high BMR.

Furthermore, in females, it is likely that BMR fluctuates slightly during the menstrual cycle, however, the studies on this are limited. Higher muscle mass is associated with a higher BMR.

In humans, age, gender, genetic background, and physical fitness level can affect BMR with advancing age and reduced fitness levels contributing to a lower value. It also determines the rate at which an individual can burn calories, thus demonstrating an association with his or her body mass.īMR is one of the most widely measured physiological traits however, it exhibits significant variability across, and even within, species. It is a measure of an organism’s capacity for growth, maintenance and reproduction. A person’s Basal Metabolic Rate (BMR) is the rate of energy expenditure required to keep the body functioning whilst at rest.

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