Thesis (M.Sc.) - Cairo University - Faculty of Physical Therapy- Department of Basic Science

Background: The adverse effects of abnormal forward head posture, which considered as a common posture displacement with a conservative estimate of 66%, highlighted in many studies, however there is a lack of literature concerning its effect on sympathetic fibers. The purpose: This study was conducted to investigate the association between forward head posture and the latency and amplitude of sympathetic skin response (SSR). Subjects: Thirty subjects with mean age 25.9 ± 2.56 years, mean height 175.86 ± 6.34 cm, mean weight 84.06 ± 9.49 kg and mean body mass index 27.16 ± 2.54 kg/m2 were participated in this study with cranio vertebral angle (CVA) or forward head angle mean 34.2 ± 3.5O. Method: Forward head posture was determined by measuring craniovertebral angle and sympathetic sudomotor outflow was determined by measuring sympathetic skin response (SSR) by measuring latency and amplitude of sympathetic skin response. Results: There was significant correlation between cranio vertebral angle and latency of sympathetic skin response (r = -0.6050, p < 0.0004), and between cranio vertebral angle and amplitude of sympathetic skin response (r = 0.4377, p = 0.0156

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