BMR/RMR
- Created by: Bananna20
- Created on: 20-02-22 15:20
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- BMR / RMR
- Body Size
- Variation in body size accounts for over 1/2 of variability in BMR between individuals. If a person is bigger, there is more metabolically active tissue to use energy.
- Body Composition
- Adipose tissue has lower metabolic rate than lean tissues, ? an individual with a high lean mass will have a higher metabolic rate than an individual with the same body weight but lower lean mass
- Age
- Young infants use energy to maintain body temperature. During adulthood there is a decline in lean mass and a relative increase in fat mass, accounting for a decline in BMR
- Sex
- Differences in body size and composition account for difference in BMR between males & females
- Diet
- Overfeeding / underfeeding can increase / decrease BMR by 5-10%
- Climate
- Energy cost of maintaining body temperature e.g. cold-induced thermogenesis
- Genetic Differences
- BMR varies by up to 10% between individuals of the asme sex, age, weight & fat-free mass
- Hormonal State
- Endocrine disorders can change BMR e.g. small cyclical changes in BMR during menstrual cycle (rise just after ovulation)
- Psychological state
- Acute anxiety is a stimulator of adrenaline, which increases energy expenditure
- Pharmacological agents
- Caffeine & nicotine increase energy expenditure. Beta blockers reduce energy expenditure
- Disease processes
- May increase metabolic rate - fever, tumour, burns
- Body Size
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