A lucid presentation on Physical activity of the human body and Nutrition for medical ,dental ,pharmacology and biotechnology students for easy learning.

1. Physical activity of the human body and Nutrition
Dr. Rohini C Sane

2. Physical activity
• The energy requirement of individual would depend on :
1. occupation
2. Physical activity
3. Lifestyle : Physical activity of the individual is highly variable,
(sedentary ,moderate and heavy .Additional calories are to be
added for each category).
• Factors affecting the amount of energy needed for physical activity :
A. Duration
B. intensity of muscular activity

3. Energy requirement during physical activity:1
• For sake of convenience ,the individual are grouped
into four categories based upon type of physical
activity and extra requirement of energy.
Type of
physical
activity
extra Energy
requirement
(%of BMR)
Examples of workers
Sedentary 30-40
office workers,lawyers,Doctors, teachers, Shop
workers,Architects,accountant
Moderate 40-50
students ,fisherman ,housewives , industry
workers
Heavy 50-60
Agriculture workers,miners ,athletes , blacksmith,
factory workers,unskilled labours,lumbar jacks
Very
heavy
work
60-100 construction workers,rickshaw pullers

4. Energy requirement during physical activity:2
• Energy requirement for Light work = BMR(60%of calories)+
SDA(10% of calories)+Physical activity(30%of calories)
Type of physical activity
Energy need for
BMR (kcal /kg body
body weight /day)
extra energy requirement for
physical activity (% BMR)
Sedentary/ light work 2200-2500 30-40
Moderate work 2500-2900 40-50
Heavy work 2900-3500 50-60
Very Heavy work 3500-4000 60-100

5. Energy requirement during physical activity:3
Physical activity
Energy requirement kcal/hr
(over and above BMR)
Sitting(Quietly) 25
Eating 28
Standing/ Writing(Quietly)/Eating/ Reading 30
Driving Car 60
Typing 75
Household Work (Dish Washing) 80
Typing at High Speed 100
Walking (Slow) 130
Sexual Intercourse 140
Cycling (Slow Speed 25 Km /Hr) 150
Running(Moderate) 500
Swimming(Speed 3.5Km /Hr) 550
Walking Upstairs 800

6. Calculation of Energy requirement during moderate work
• Body kilogram weight = 55 kg,Type of physical activity : moderate
• For BMR: 24 X 55 kg= 1320 kcal/day
+for physical activity = 40% of BMR( 1320)= 528 kcal/day
• subtotal for BMR + physical activity = 1320+ 528= 1848 kcal/day
+need for SDA (10% of subtotal )= 184 kcal/day
• Total energy requirement =1848+184= 2032kcal (rounded up = 2050
kcal /day)
• additional requirement of energy during pregnancy = + 300 kcal/day
• additional requirement of energy during lactation = + 500 kcal/day
• additional requirement of energy during growth , convalescene

7. Calculation for energy requirement for 55kg person during
moderate work
Category Calculation
Calculation for
Energy
requirement/day
1 For BMR 24x55kg 1320kcal
2 + For physical activity 40% of BMR 528kcal
3 subtotal(1+2) 1320+528 1828 kcal
4 +need for SDA 1848X10% 184kcal
5 Total energy requirement (3+4) 1848+184 2032kcal
6 rounded to nearest multiple of 50 2050kcal

8. Calculation of energy requirement for a male medical student
• Calculation of energy requirement for a male medical student
Age of a male student =18years, BMR= 43 kcal/square meter body
surface area , Body surface area =1.7square meter (m2)
Criteria energy requirement(kcal)
1 8hr.sleep at basal level 43x1.7x8=585
2
8 hr. of simple activities
a) at basal level
b) for simple physical activities at 20kcal/
hr
subtotal of [a)+b) of 2 ]
=585
=20 x8 =160
= 585+160= 745
3
a) at basal level=585
b) 8hr. consisting of practicals ,lectures,
library work,studies at 70 kcal /hr(=560)
subtotal of [a)+b) of 3]
subtotal of 1 + 2+ [a)+b) of 3]
585
560
1145
585+745+1145= 2475
c)SDA at 10% of 2475 248
Total energy requirement (1+2+3) 2723

9. Thank You