How Levers system work in Physiotherapy ?

Let Physiotherapy

 A  order of levers is the  way  by which the human body achieves movement and flexibility

A knowledge of the lever principles is also standing of for the under a method of progression in strengthening muscles. As the strength of the muscle increases, the resistance or weight which is to be overcome must also be increases until such time no further progression is possible or desirable. As the insertions the effort factors are at fixed points in relation to the joints the only factors capable of variation are the weight and its perpendicular distance from the fulcrum.

 Added resistance to the muscle action can therefore be applied, either by increasing the weight to be overcome or by increasing the length of the weights arm. 

The latter is usually referred to as increasing the leverage Increasing the leverage is concerned with the situation of the point of application of a given weight.

 For example: Abduction of the arm at the shoulder joint with the elbow flexed reduces the leverage, and relatively weak muscles can perform the movement,   

whereas when the elbow is straight the leverage is increased a more powerful contraction is required. This can be demonstrated in the case of Deltoid paresis, with the patient sitting and with the shoulder girdle fixed.

Similarly, the situation of an external resistance, be it manual or mechanical, will dictate the muscular effort required to overcome it.

For example: With the patient in a lying position a known resistance given at the level of the knee joint is more easily overcome by the extensors of the hip than   the same resistance applied at the foot when the knee is straight.