Accommodating resistance machines

Reviewed by: William J Kraemer Ph D, Human Performance Laboratory, Ball State University, Muncie, Indiana 47306; Steven S Plisk, MS CSCS, Director of Sports Conditioning, Yale University, New Haven, Connecticut 06520 A new strength-training machine allows the user to instantly change resistance at any point in the exercise movement.

The machine has the potential to improve strength by optimizing the time each targeted muscle spends under maximum stress.

Without going into too much detail on joint angles and length-tension relationships, it’s important to understand, that the resistance changes throughout a movement.

During an ascending strength curve, the movement gets easier towards the end of the motion.

The new machine I reviewhere may be one of the good ones.

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This variability of strength is commonly called the force curve of a lift.

The advent of mechanical weight releasers furthered this concept.

Most weight releasers are long, telescoping metal rods with a hook on one end and a shelf or retaining mechanism on the other.

Powerlifting-style training has spread throughout the hardcore in the general fitness realm.

Assistance exercises such as box squats, glute-ham raises, and reverse hyperextensions get used often.

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