Importance of Energy for Human Body
Energy is the ability to do work, and it works in 3 different ways. All human being needs it though if they are not involved in any physical activities. The human body is like a machine, for a machine’s greater efficiency it needs an oil and other lubricants. Similarly, the human body also requires it to keep body parts moving and remain healthy.
- Chemical work (Building cells components)
- Transport work (Substance among cells)
- Mechanical work (Muscle construction)
Everybody needs energy, and it comes from different dietary sources such as Carbohydrates, Proteins, Fat and Alcohol. We measure it in terms of calories and joules and easily convertible into any other unit.
The primary body fuel for athletic activities is muscle glycogen and fatty acids which come in the form of carbohydrates and fat. In extreme circumstances such as carbohydrate, depletion body uses protein 5 -10 percent. Storage Division, The total storage of glycogen, is 500g in which 400g stores in muscles and 100g in the liver that is enough for 2 hours of high-intensity exercises. The storage capacity of glycogen increases by increasing muscle mass, intensive training, and CHO-rich diet. Energy comes from the substance known as ATP it is very limited to the muscles and remains for 1-2 sec.
One calorie is the amount of heat needed to raise the temperature of 1 gm of water by one centigrade. A calorie is smaller unit hence kcal is commonly used. Number of calories for the energy sources
- Carbohydrates, 1g = 4 calories
- Protein, 1g = 4 calories
- Fat, 1g = 9 calories
- Alcohol, 1g = 7calories
There are three energy systems that work together to provide the energy.
- Creatine Phosphate (phosphocreatine/up/anaerobic lactate) this system does not require oxygen, fat, and carbohydrates but infect use chemical energy.
- Lactate (anaerobic glycolysis) it refers conversion of glucose to lactic acid.
- The aerobic (oxidative) energy system that produces ATP from the complete breakdown of carbohydrates and fat in the presence of O2.