Describe the physiological factors which determine the speed as a component of physical fitness?

Solution

Speed is determined to a great extent by the genetic factors. The study of physiological Factors helps to select the activity for an individual.

The mobility of the Nervous System: The rapid contraction and relaxation of muscles are made possible by the rapid excitation and inhibition of the concerned motor centres. The nervous system can maintain this rapid excitation and inhibition for only for a few seconds. After which the excitation and inhibition for only for a few seconds. After which the excitation spread to the neighbouring centres causing tension in the entire body. This results in a decrease in speed. The mobility of the nervous can be trained only to a very limited extent.
Muscle composition: The muscle, which has more percentage of fast twitch fibre, contract with more speed in comparison to the muscle which has lower percentage be slow twitch fibre. The muscle position is genetical and cannot be changed by training.
Explosive strength: For very quick and explosive movements, explosive strength is indispensable. It depends upon metabolic composition, muscle size & muscle coordination. The explosive strength of the muscles can be improved through training.