The main benefit of passive stretching is that muscle fibres are relaxed before the stretch begins and continue to stay relaxed throughout the stretch. This effectively decreases the chances of the stretch reflex being activated. The stretch reflex is triggered when a muscle is forced to go beyond a comfortable length. At that point, it automatically tries to shorten in an attempt to protect itself from injury. Triggering the stretch reflex negates the positive effects of stretching and is potentially dangerous. During any kind of stretching, the individual should feel, at most, mild discomfort, but certainly not pain. The pain is a result of the muscle trying to shorten.
During passive stretching, each partner plays one of two roles:
In order for passive stretching to be effective, a number of criteria must be met.
If (probably when for those who are new to passive stretching) the passive person tries to help, the active partner must totally release the stretch and begin again when the passive individual has relaxed.
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