Health and Physical Education - XI (b) Explosive Strength: In some of the books, you may find this with the name of elastic strength. This is the ability where both strength and speed comes into play. When the muscle or group of muscles contract with high speed to overcome or to act against the resistance with per cent to per cent effort, then it is called the explosive strength. There are several examples where the explosive strength is required such as jumping, sprinting in athletics, boxing, etc.
(c) Strength Endurance: As it reflects from the name itself that it is related to the work which is done for longer duration. It is both strength as well as endurance which comes into play. In simple words, we can say that when our muscle or a group of muscles act against the resistance with per cent to per cent effort or try to overcome the resistance for longer duration in spite of having fatigue, then it is called that the individual is having strength endurance. There are many sports where we can easily see the use of this ability such as hill running in cross country race, cycling, swimming, etc.
As we know that strength depends upon the contraction of muscles and several other factors. So let us have a look on the factors which play major role in the liberation of force by the muscles. These are as follows— . Neural Control: How much force the muscle will generate largely depends upon three major factors.
● ● Number of motor units involved in the contraction — If the greater number of motor units are recruited then more amount of force will be generated. ● ● Size of the motor units involved in the contraction — If the size of the motor units is greater, then also, the amount of force generated will be higher. ● ● Intensity of nerve impulse — If the intensity of nerve impulse is faster, then also, the force generated by the muscle will be higher. .
Muscle Cross-section: It is well known to everyone that liberation of force largely depends upon the size of the muscles. The more the size, the more force it will generate. . Muscle fibre: Muscles are made up of two types of fibres, one is fast twitch fibre (white) and another -