explain any 3 physiological factors determining speed.
80-90 words plz
Answers
1. Mobility of the nervous system: Our muscles contract and relax at maximum possible speed such as in sprinting events. This rapid contraction and relaxation of muscles is made possible by rapid excitation and inhibition of the concerned motor centres.
This is called the mobility of the nervous system. The nervous system can maintain this rapid excitation and inhibition only for a few seconds after which the excitation spreads to the neighboring centers causing tension in the entire body. This results in decrease in speed.
2. Muscle composition: The muscles, which have more percentage of fast twitch fibres contract with more speed in comparison to the muscles which have lower percentage of fast twitch fibres. In fact, the muscles composition is genetically determined and cannot be changed by training. Different muscles of the body have different percentage of fast twitch fibres. So, different parts of body have different speed performance.
3. Flexibility: Up to some extent, flexibility also determines the speed. In fact, good flexibility allows maximum range of movement without much internal resistance. Flexibility also enables complete utilization of explosive strength.
1. Mobility of the nervous System :- The rapid contraction and relaxation of muscles is made possible by the rapid excitation and inhibition of the concerned motor centres. Nervous system can maintian 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 neighbourning centres causing tension in the entire body. This results in decrease in speed. The mobility of the nervous can be trained only to a very limited extent.
2. Muscle composition :- The muscle, which has more percentage of fast twitch fibre, contract with more speed in comparison to the muscle which have lower percentage be slow twitch fibre. The muscle position is genetical and can not be changed by training.
3. Explosive strength :- For very quick and explosive movements, explosive strength is indispensible. It depends upon metabolic composition, muscle size & muscle coordination. The explosive strength of the muscles can be improved through training.