Energy

Energy

role of energy
1. 3. physical activity
2. 4.growth
3. 2.heat & constant body temperture
4. 1.metabolism
  1. Basal metabolic rate
    1. least energy needed at rest to keep body working e.g heart
  2. all chemical reactions
energy value
1. Units
  1. kilocalorie-kcal
  2. kilojoule -kj
2. lipids 9kcal/37kj
3. protein-4kcal/17kj
4. carbohydrates-4kcal/17kj
5. alcohol-7kcal/29kj
Factors determining BMR/energy needs
1. 7.activity /8.occupation
2. 3.gender
  1. men need more as more muscle
3. 5. age
  1. children/teenagers -more for growth
4. 4.body size
  1. larger-more energy
5. 6.climate
  1. more in cold to keep body temp.
6. 1.pregnancy/lactation
7. 2.health
  1. less energy if recovering in bed
Balancing energy intake & ouput
1. intake =output -keeps healthy weight
2. kcal intake greater than output=weight gain
3. lose weight by increasing output by activity
Definition-ability to do work

Resource summary

	Created by a stoddart over 10 years ago