Nowadays static resistance machines are not popular and are not used to lose weight because isometric exercise is the least effective of the four training technologies. Accommodating Resistance Devices
"Like variable resistance devices, accommodating resistance machinery can help you exert maximum resistance throughout the full range of movement during each exercise. Due to this the amount of exercise stress which your muscles receive is maximized." (source: International Sports Sciences Association; 2001). Accommodating resistance exercise equipment somewhat controls the resistance that is encountered, thereby allowing the user to exert maximum force throughout the entire range of motion and throughout the entire exercise. Most curcuit training fitness centers use this type of equipment. Its major advantage is the possibility to exert maximum force in any position which provides a full and complete workout. Let's take as an example dumbbell curls. Traditional dumbbell curls decrease the leverage at the top of the movement while circuit training exercise equipment gives you even and consistent force throughout the entire range of motion. This means that if you use circuit training exercise equipment your muscles are placed under the constant tension for more time than alternative training technologies. "Tension (resistance which makes your muscles adapt), together with sufficient time over which it is applied, go hand-in-hand to help you achieve great results" (source: International Sports Sciences Association; 2001). Another benefit of accommodating resistance exercise equipment is that the relatively controlled speed of the movement is useful for preventing injury. It is imposible to do ballistic movement on this type of equipment, which means that it is hightly unlikely that you can have injury from overextended joints, pulled muscles and uncontrolled movements. Conclusion:
The training technology placed behind the circuit training equipment is solid. This type of training equipment utilizes accomodating resistance to provide long lasting results.
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