Researchers acknowledge that the leg press is not an exact match for the
barbell squat in terms of movement patterns, range of motion, and
stability requirements, which is, of course, the point.
Machine exercises, whether it’s a Nautilus, Smith, or some other type,
restrict range-of-motion, change the natural movement patterns of the
body, and affect all outcomes of training including strength,
hypertrophy, and metabolic effect.
Other reasons to avoid machines is that they place extra stress on the
joints, lead to less power development (this has been shown comparing
power output in a bench throw on the free weight bench and the Smith),
less muscular activation, and less maximal strength.
Cable machines are
the one exception that can be a staple for all trainees, whereas certain
machines can be useful in rehabilitation or advanced isolation
training, but
free weights should be favored for strength, hypertrophy,
functional performance, and fat loss.
Full Text undQuelle:
http://www.charlespoliquin.com/Blog/tabid/130/EntryId/1830/Tip-507-Favor-Free-Weights-Over-Machines-For-Greater-Strength-and-Testosterone-Response.aspx
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