How is the RFST different from PNF stretching, active isolated stretching, etc.?
Other forms of stretching usually include static stretching (holding the muscle in an elongated position while relaxing) and sometimes incorporate isometric contractions (static contraction of the muscle group). RFST includes isometric contractions, but goes beyond by stressing that: • in order to get a true gain in flexibility, you must continuously contract the target muscle group while elongating it (eccentric contraction) from where it is as short as possible to where it is as long as possible • a muscle is only truly flexible to the point where it can continue to maximally resist while being lengthened (using twice the force used to strength train the muscle) • stretching without continuously contracting a muscle (static stretching) produces a false range of motion known as substitution, and ultimately results in over-stretching and injury Additionally, each of the resistance stretches (eccentric contraction) can be reversed to provide strength training (concentric contraction). P
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