Energy is defined as “capacity for doing work”. Energy is needed for all activities that are performed by the muscles when stimulated by the nervous system. Contraction of the muscles causes movements around the joints. These movements when properly coordinated result in some types of skill performance such as jumping, kicking, clapping, running, throwing, dancing, etc.

                                   FORMS OF ENERGY

  1. Chemical energy
  2. Sound energy
  3. Potential energy
  4. Kinetic energy
  5. Electric energy
  6. Light energy
  7. Solar energy


  1. Chemical energy:-This is stored in fuel and foods. The main source of chemical energy for athletes are obtained from three major classes of food. They are
  2. Carbohydrates
  3. Fats and oil
  4. Proteins

Carbohydrate are digested into glucose

Fats and oil are digested into fatty acid and glycerol

Proteins are digested into amino acid

  1. Sound energy:-It enables to hear sounds of different kinds such as human speech, singing, radio, or television sounds and thunder.
  2. Potential energy:-This is energy of position. An object has potential energy if it has been pushed or pulled into a position from which it can do work
  3. Kinetic energy:-It is energy of motion of a body. Any object that is moving has kinetic energy.
  4. Electrical energy:-It is used to operate electric fans, radio sets, television sets, refrigerators and many other appliances
  5. Solar energy is radiant light and heat from the sun that is harnessed using a range of ever-evolving technologies such as solar heating, solar thermal energy and so on
  6. Heat energy:-it is used to cook food, iron clothes and boil water to produce steam that operates engines
  7. Light energy:-Light energy can deflect the pointer of a light meter.

Plants use light energy to make their food in the process of photosynthesis



Glucose supplies the immediate energy needed by the muscles to carry out all their         activities. This makes carbohydrate the most valuable class of food in energy production.

Energy released in the muscles is in form of heat, increase in tension or by shortening the fibres for contraction.



  1. What are the end products of the following?
  1. Carbohydrate_____________________________
  2. Protein__________________________________

Fats and oil_______________________________


See also

Physical Fitness





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