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Chapter: 11th 12th std standard Class Nursing Health Care Hospital Hygiene Higher secondary school College Notes

Factors affecting Basal Metabolic Rate (BMR)

Basal Metabolism is the minimum amount of energy needed by the body for maintenance of life when the person is at post absorptive state, physical and emotional rest.

BASAL METABOLISM

 

Basal Metabolism is the minimum amount of energy needed by the body for maintenance of life when the person is at post absorptive state, physical and emotional rest.

 

Basal Metabolic Rate (BMR) is a measure of the energy required by the activities of resting tissue.

The Basal Metabolic rate can be measured directly from the heat produced (using a Respiration Calorimeter and Metabolic Chamber) or indirectly from O2 intake and CO2 expenditure when the subject is at rest.

 

Factors affecting Basal Metabolic Rate (BMR)

 

The factors affecting Basal Metabolic Rate are listed in table-20B.

Factors affecting Basal Metabolic Rate (BMR)

 

 

Body Compositon : The more lean body mass higher is the BMR. This is due to greater metabolic activity in these tissues when compared to bones and fat. Men with a high proportion of muscle mass or lean body mass have a higher BMR than women.

 

Fever: Fever raises the BMR. There is a 7% increase in BMR for each degree rise in temperature in Fahrenheit.

 

Stress Smoking & Caffeine : Stress raises BMR. Increases the BMR

 

Hyperthyroidism (Oversecretion thyroxin) : The basal metabolic rate is elevated as of much as 50-70%.

 

Growth : In children and pregnant women the BMR is higher.

 

Pregnancy : During the last trimester of pregnancy Basal Metabolic rate is increased by 15- 25% as there is a increase in muscle mass of uterus, size of mammary gland, foetal mass and placenta, cardiac work and respiratory rate.

 

Fasting/Starvation : Lowers BMR

 

Hypothyroidism (under secretion of thyroxin) : The basal metabolic ra

 

 

Age : Lean body mass diminishes with age slowing the BMR. In tall people the BMR is higher.

 

Undernutrition : Prolonged undernutrition lowers the BMR.

 

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11th 12th std standard Class Nursing Health Care Hospital Hygiene Higher secondary school College Notes : Factors affecting Basal Metabolic Rate (BMR) |


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