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Stretch-reflex
Can be described as an automatic (initiated by the nervous system) muscle contraction after the muscle was stretched. The automatic contraction helps to augment force. However, there are three conditions that need to be met to utilize the stretch-reflex. 1) a concentric muscle contraction must follow a eccentric movement 2) the timeframe for both sequences should be within 0.25 seconds 3) muscles need to be pre-activated to utilize the stretch-reflex.