Sunday, 20 May 2012

Does exercise make our muscles strong? How?

When exercise is repeated over a period of time, changes occur in the functions of various organs. All these changes depend on factors like the frequency and intensity of exercise, type of exercise age, and the muscles which are used and also to the previous training of the individual.

Body muscles tissue can be classified as skeletal, cardiac and visceral. Skeletal muscles are those which are attached to the bones. The muscular body of the heart is formed by the cardiac muscles. Visceral muscles are present in all hollow viscera which include gastro intestinal tract, blood vessels, duct of glands, respiratory and lymphatic system of the body.

The primary effects of exercise occur in our skeletal muscle. When we exercise, there are an increase number of capillaries in muscle tissue. This lead to increase in blood flow and therefore more oxygen is brought to the cells.

There is more extraction of oxygen by muscles cells when we exercise and thus lower the lactate concentration which leads to muscles cramps. This shows that muscles depend more on aerobic mechanism. The capacity of the muscle cells increases to oxidize carbohydrate and lipids, because of which more fat, can be used.

As a result of exercise, both the muscle mass and the force produced by the muscle increase however, the number of muscle fibers is not affected. Thus, more protein synthesis and less protein breakdown occurs. Due to the increase in permeability of muscle cells, amino acids uptake by muscle cells is enhanced. The muscle connective tissue, the tendons and the ligaments become stronger as we exercise.

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