Scientific Principles
A common goal for strength-training programs is to increase or to maintain one's physical strength or muscle mass. In order to achieve more strength as opposed to maintaining the current strength capacity, the muscles (see skeletal muscles) need to be overloaded which stimulates the natural, adaptive processes of the body which develops to cope with the new demands placed on it.
Progressive overload not only stimulates muscle hypertrophy, but it also stimulates the development of stronger and denser bones, ligaments, tendons and cartilage. Progressive overload also incrementally increases blood flow to exercised regions of the body. Progressive overload also stimulates more responsive nerve connections between the brain and the muscles involved.
Conversely, decreased use of the muscle results in incremental loss of mass and strength, known as muscular atrophy (see atrophy and muscle atrophy). Sedentary people often lose a pound or more of muscle annually.
The loss of 10 pounds of muscle every decade is one troubling consequence for people choosing a sedentary lifestyle. The adaptive processes of the human body will only respond if continually called upon to exert greater force to meet higher physiological demands.
Read more about this topic: Progressive Overload
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