Examples of accommodating resistance exercise equipment

To completely understand fitness and exercise equipment it's important to comprehend the four different technologies of that equipment: 1) Constant Resistance Devices 2) Variable Resistance Devices 3) Static Resistance Devices 4) Accommodating Resistance Devices Constant Resistance Devices: "The term constant resistance means that a weight (resistance) does not increase or decrease during the course of exercise".The amount of resistance encountered by the user remains unchanged from the beginning of the exercise movement to the end.Examples of training or weight lifting with constant resistance devices would be lifting a barbell, dumbbell, or using a cabled weight stack.

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First of all, constant resistance weight lifting exercise does not correct for changes in the musculoskeletal leverage that occurs during an exercise movement.Secondly, this method does not account for reduced effort that comes with fatigue.When following a weight lifting routine with constant resistance devices, the user experiences changes in leverage during the joint movement.For example, when doing dumbbell curls the amount of muscular force required is much greater at the bottom of the movement (when the dumbbells are at waist level) than it is at the top of the movement (when the dumbbells are near the chin).As the dumbbells approach the top of the movement, leverage improves and the user doesn't have to work as hard.

Therefore, the user doesn't gain as much benefit during the 'easy' portion of the movement.Muscles need stress to gain strength and endurance, so with the relatively diminished stress of constant resistance devices some of the benefit is gone.Some experts argue that constant resistance exercise is more natural than any other weight lifting program because leverage imbalances match the actual day-to-day movement of the body.Variable Resistance Devices: "When you hoist a weight by pulling on a cable that goes over the top of a pulley and is attached to a weight, you're engaged in constant resistance training".Some exercise equipment manufacturers have experimented with pulleys that aren't round or don't have the hole in the exact middle of the pulley, resulting in different levels of resistance felt during different points in the exercise movement.Unlike constant resistance devices, variable resistance fitness equipment does not match the natural way the human body works.