الفهرس 
Correlation between gluteus maximus inhibition and over activity of upper fibers of trapezius in patients with chronic mechanical neck pai=
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Abstract
BACKGROUND: chronic neck pain (CNP) is becoming increasingly prevalent in society. Neck pain patient{u2019}s exhibit greater activation of accessory muscles, (SCM, anterior scalene and upper trapezius muscles) and may also show changed patterns of motor control compensating for reduced activation of painful muscles. OBJECTIVES: to determine if there is an association between gluteus maximus inhibition and over activity of upper fibers of trapezius in patients with chronic mechanical neck pain. METHODS: Forty female patients participated in this study represented with mean age (22.74±2.674) years and mean body mass index (25.36±2.721) (Kg/m2)), diagnosed as chronic mechanical neck pain. Amplitude and onset of muscle activation were assessed by using the surface Electromyograghy during prone hip extension test. RESULTS: The results of this study demonstrated that there is no correlation between the amplitude of EMG activity of right gluteus maximus and the amplitude of EMG activity of right upper trapezius (r=-0.01, P<0.05) and there is no correlation between the amplitude of EMG activity of left gluteus maximus and the amplitude of EMG activity of left upper trapezius (r=0.256, P<0.05) in patients with chronic mechanical neck pain. CONCLUSION: It can be concluded that the overactivity of the upper trapezius muscle in patients with chronic mechanical neck pain is not related to the inhibition of the gluteus maximus muscle during PHE test