controversy remains about the stretching parameters needed to achieve a particular goal or treatment outcome. In clinical practice, multiple stretching techniques are used; nevertheless, there is no evidence-based agreement on the most effective parameters. One of these parameters, that might be affecting the treatment outcome the most, is the stretching duration, thus far there is a little agreement on the optimal stretching duration. This non agreement in exact stretching parameters is obvious between authors and researchers in the field of muscle energy techniques (MET) as well as those who have used and advocate various durations for the passive stretch that follows the contraction phase in MET.
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Inclusion Criteria: * Eligible patients had to be between 18 and 40 years of age * have generalized neck pain for more than 3 months. * with symptoms provoked by neck postures, movements, or palpation Exclusion Criteria: * Subjects' exclusion criteria included specific neck pain due to trauma, disc protrusion, whiplash, congenital deformity of the spine, spinal stenosis, neoplasm, inflammatory or rheumatic disease. Furthermore, subjects were excluded if they had a history of spine surgery and any objective findings consistent with neurological conditions and vascular disorders.