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عمومی::
فاصله نقطه محور
Well-designed machines place a relatively consistent stress on the muscles by means of a cam or other device that creates a longer (figure 4.6a) or shorter (figure 4.6b) distance between the pivot point and point where the force is being applied, called the pivot-point distance.
The design of the cam or other device is an attempt to match the shortest pivot-point distance with the most difficult range of the exercise and the longest pivot-point distance with the easiest range.
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