Leveraging a unique cam-based resistance system, these exercise devices provide a variable resistance throughout the entire range of motion. This means the resistance increases as the muscle strengthens during contraction, providing a more consistent challenge and arguably promoting greater muscle fiber recruitment compared to traditional free weights or weight stack machines. An example would be a bicep curl machine where the resistance is smoothly increased during the lifting portion of the exercise and then smoothly decreased during the lowering portion.
This innovative approach to strength training, originally popularized in the 1970s and 80s, aimed to optimize resistance training by closely mimicking the natural strength curve of muscles. The intended benefit was improved strength gains, reduced joint stress, and a more efficient workout experience. This technology significantly impacted the fitness industry and remains relevant today, influencing the design of many modern resistance machines.
