?:definition
|
-
Muscle strength exercisers designed to provide resistance to muscular contraction when the legs are extended against the resistance using a mechanism based on a system of pulleys and cables or levers. These exercisers usually consist of a stand-alone machine with weights stacked on top of each other or a hydraulic mechanism, a system to transmit the force (i.e., to convey the resistance), and lever bars or cables on which the user exerts force to counteract the exerciser resistance. Typically, users lift a padded lever bar with their ankles to extend the knees; less frequently, using the legs, the users pull the cables to extend their knees. Leg extension exercisers are intended to improve the strength of quadriceps muscles, increase muscle size, enhance muscle endurance and power, and improve bone density.
|