Traditional static stretching involves increasing tissue extensibility by activating Golgi tendon
organs, which occurs after 7 to 10 seconds of holding an isometric stretch at a certain point of tension.
For example Dietz et al (6) have shown that the CNS can reset Golgi tendon
receptors and related reflex arcs so that they function as delicate antigravity receptors.
Six seconds is used because, according to the neurophysiology of the muscle, it takes at least six seconds for the Golgi tendon
organ to send impulses that trigger the muscle to relax and become receptive to the stretch.
When a muscle in a stretched position is held and then contracted, proprioceptors (sensory end organs in muscles, tendons, and joints) called golgi tendon
organs (GTOs) are stimulated.
The Golgi tendon
receptors play an important role in both of these techniques.