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Why do muscles grow?

23.06.2014 12:45

 

Why do muscles grow?

The maximum force a muscle depends on the number of its myofibrils in the physiological cross-sectional dependent (They consist of tiny juxtaposed chambers, the sarcomeres., When the muscle contracts, act in two main varieties of filamentous proteins, . myosin and actin. When they are long, thin filaments, which consist of two different proteins -. actin and myosin Actin is periodically it give rise to thin filaments lie between these myosin filaments your ends.. overlap with the ends of actin fibers).
 
A regular force stress leads to an increase in cross section of the muscle fibers (hypertrophy), which thus comes about that the number of myofibrils increases in the muscle fibers. A proliferation of muscle cells (hyperplasia) is controversial or non (unique) assigned.
 
Often we find that in the course of training the muscle strength increases significantly more than would be assumed from the extent of the increase in cross section. Even so, the early occurrence of the increase in power is a Fibrillenbuilding not solely be explained. This may disregard a lot more time. One explanation for this co-ordination within the muscle.
 
To bring all of the fibers of a muscle to contract at the same time, is not possible.
The maximum value is under ordinary conditions at about 65-70%. In extreme situations, such as in fear of death or doping, values ​​are up to 90% can be achieved.
 
The short onset of action of strength training is to be seen especially in an improved neural transmission.
Thus, the following is meant:
 
The randomly emitted from the brain motor impulses do not run over a single continuous nerve pathway up to the muscle fiber, but numerous switching stations, they can be both strengthened and weakened. The regular repetition of an excitation sequence promotes in many cases long-term gain. Thus, a stronger impulse reaches the motor unit, the threshold is rather exceeded, so it can more units are stimulated above threshold within a muscle.
The coordination between the different motor units of the same muscle is referred to as intra-muscular coordination.
It can be brought voluntarily to contract a total of more fibers.
 

Work several muscles together, we speak of inter-muscular coordination.

 
A non-physiological increase in muscle strength is related to doping. However, genetic factors appear to play an important role.
 
 

Intramuscular coordination

Nerve-muscle interaction of a single muscle within a specific range of motion. Characterized by the interplay between the nervous system and skeletal muscles in relation to use and load size of the motor units.

Inter Muscular coordination

Interaction of various muscles in a targeted movement. Characterized by the interaction of agonistic and antagonistic muscles working.

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