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1. ENERGETICS
METABOLIC RATE &
BASIC METABOLIC RATE
(BMR)

2. Metabolic Rate
refers to how fast the body converts food into
energy for the body to perform different functions

3. Factors affecting BMR
1.Surface area: directly proportional to surface area
2.Sex: men have marginally higher BMR (5%)
3.Age: in infants and growing children BMR is higher. In adults
BMR decreases at the rate of 2% per decade of life
4. Physical activity: increase with regular exercise
5.Hormones: Thyroid hormones increase BMR. Epinephrine,
cortisol, sex hormones and growth hormone hormones
increase BMR

4. 6.Environment: BMR is higher in cold climates compared to
warm climates
7.Starvation: during starvation a decrease in BMR up to 50%
has been reported
8. Fever: fever increases BMR. 10% increase for every 1 C rise
⁰
in body temperature
9. Disease status: BMR is elevated in infections, leukemia,
cardiac failure hypertension etc.

5. BMR-Introduction
Food is the fuel source of the body, the ingested
food undergoes metabolism to liberate energy required
for the vital activities of the body.

6. BMR-Definition
BMR is minimum amount of energy required by the body
to maintain life at complete physical and mental rest in post
absorptive state.
Several functions within the body occurs at basal condition
Working of heart and other organs
Conduction of nerve impulse
Reabsorption by renal tubules
Gi motility
Ion transport across membranes

7. Measurement of BMR formula

8. Normal values of BMR
◦Adult man: 35-38 cal/sq.m/hr or 1600cal/day
◦Adult woman: 32-35 cal/sqm/hr or 1400cal/day
◦A BMR value between -15% and +20% is considered normal

9. Body fats 2 Categories
1. Essential fat – needed for normal and healthy
functioning of the body
2. Storage fat – a fat accumulation in the adipose
tissue
- used to protect our internal organs from injury

10. How much energy is spent by a
typical student who walks at a
moderate speed from his dormitory to
his school and from his school back
to his dormitory for 1 hour, sits in his
class and takes down notes for 4
hours, and sleeps for 6 hours. Assume
that his mass is 65 kg.

11. Suppose that the breakfast of a typical 65
kg adult gives 1.85x10^5 J of energy. how
long does he have to do push ups to burn
at least 50 percent of this energy?
A. what is power?
B. what is basal metabolic rate?

12. Mass =65 kgm
𝑚
1 MET=1 kcal/kg/hr
1 kcal=4184 J
3600 s=1 hr

13. Problem 1
Scenario: Lunch provides 2.50×10^5 J.
How long to burn 30% of this energy by
jogging (7 METs)?

14. THANK YOU…!