Variable or accommodating resistance training machines
Consequently, we accelerate more quickly and reach a faster speed in the middle of the lift, and we also accelerate for longer, because the bands or chains keep adding resistance as we progress through the lift (this happens even when we match the same percentage of 1RM with both types of resistance).
Moving faster, and accelerating for a longer period of time seem cause greater gains in high velocity strength, and this could happen through any of adaptations, such as increased early phase neural drive, type IIX fiber retention, faster muscle fiber contraction velocity, velocity-specific coordination, or reduced antagonist (opposing) muscle activation.
In powerlifting, the “strength curve” describes the gap between the force you are *able* to exert and the force that you *need* to exert to move the barbell, across the whole exercise range of motion.
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This “flattens” the strength curve and makes performing the squat a different experience, one that is not as grueling in the bottom position, but remains difficult throughout.
This is why this bands and chains are sometimes called “accommodating resistance,” because they are used to match the resistance provided by the barbell with the force produced by the muscles.
Some people think that powerlifters originally began altering the “strength curve” of the lifts so they could use unequipped lifts (without powerlifting suits) to train the sticking points of equipped lifts (with powerlifting suits).
Others have suggested that it was an attempt to provide a different stimulus to the muscle, and produce a transferable adaptation that would not otherwise occur.
The need to overcome inertia and the changing leverage of the barbell each contribute to make the “strength curve” of the barbell back squat very steep, such that the bottom of the exercise can be extraordinarily difficult, while the rest is comparatively easy.