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Basal metabolic rate - BMR (during rest)

The general perception some people have about BMR is to consume less than 1000 calories a day and you have a healthy lifestyle. Basal Metabolic Rate (BMR) is measured in kilocalories. This is a measure of minimal amount of energy (Kcal) needed to maintain basic and essential physiological functions.

A 70Kg (154lb) person would expend approximately 1600 calories if they did nothing more than stayed in bed for 24 hours.
This is what is known as Basal Metabolism (resting metabolic). This energy expenditure can increase from 1.2 calories per minute during rest to more than 20 calories per minute during vigorous activity. Additional energy is also required for eating and to start the process of digestion and absorption. But it is physical activity that has the greatest effect on energy expenditure.

Most people’s BMR varies according to their age, gender and weight. The BMR of men and women differs. Women’s BMR is lower, this is due to a greater relative fat content and lower Fat Free Mass. Muscular individuals have a higher BMR than fatter individuals of the same weight, because fat tissue is less metabolically active than muscle tissue.

To avoid weight gain with ageing our caloric intake must decrease or we should increase our physical activity to prevent gradual weight gain. The scientific method to accurately determine BMR is costly and is conducted under controlled conditions using calorimeter chamber and oxygen.

Over the years various predictive equations have been developed to estimate BMR which are today deployed by Maltron Body Composition Analysers. Equations used by Maltron are gender specific and take into account not only height and weight, but also age.