Actuality of bodybuilding does not cease changing. An always ongoing polemic in the entrainement of force is opposition between advantages and disadvantages of the entrainement with free expenses in comparison with apparatuses of bodybuilding.
The rooms of physical education encourage the usage of machines however because they are more lucrative and surer (guided bars, modern and reassured machines, especially for the beginners).
But free weights and machine are not identical, even if they aim at the same muscular groups. For instance, the beginners do not see difference between the squat and the press with legs, but there is one however: the squat is a job in closed kinetic chain, while the press is a job in opened kinetic chain. In concrete terms, it means in the first case that a part of the body stays in direct contact with the soil during movement, in other words the final segment is fixed.
The entrainement with free weights mobilizes then the stabilizing muscles of the spinal column, what returns the more important load for muscles during this type of exercise. The entrainement with free expenses also triggers off a bigger hormonal answer to a study led by Aaaron Shaner and Disa Hartfield. A well brought up rate of anabolisantes hormones seems to favour force and muscular enlargement. The researchers also noted that the levels of testosterone and growth hormone were also more well brought up with the exerice of squat, even if effort seemed equal from the point of view of perception.
What proves that the exercises on the lower part of the body with free weights seek more muscles and boost the anabolic hormones compared to exercises with machines.
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