CORRELATION BETWEEN FORWARD HEAD POSTURE, CERVICAL MUSCLES ENDURANCE, AND PROPRIOCEPTIVE FUCTIONS IN CERVICOGENIC HEADACHE AMONG LATE ADOLESCENT STUDENTS.

B. Lateral photographic method:

Photography or photogrammetric method will be used to assess FHP. It is a reliable and valid method (Gadotti and Biasotto-Gonzalez,2010). A digital imaging technique will be used to evaluate head and neck posture in the standing position. A digital camera (Canon IXY 12 MP, Japan) will be used to capture images supported on a Magnus PV-3310 photo tripod with 3-way pan and tilt head, was used to capture a photograph. (kuo et al., 2014). Digitized photographs will be analyzed using Kinovea 2024.1.1. This is open access software used to analyze digitized photos and to measure the various head angles (Guzman-Valdivia et al.,2013)

Cervical Range of Motion device (Lindstorm, Minnesota 651-257-3040) is a type of goniometer designed specifically for cervical spine. It is a valid and reliable method to measure the cervical proprioception functions (Jordean, 2000; Tousignant et al., 2002 and Tousignant et al., 2006). It is composed of three inclinometers strapped to the subject's head and two magnets placed over the subject's shoulders. Each inclinometer measures proprioception error in one plane of movements. One gravity dial meter measures flexion and extension, another gravity dial measures lateral flexion and a compass meter measures rotation with its accuracy reinforced by two magnets Fig.(2) (Reddy et al., 2016).

Chattanooga Stabilizer Pressure Biofeedback Unit. is a valid and reliable method to assess cervical strength and endurance (ICC) 95%. The unit consists of a combined gauge and inflation bulb connected to a pressure cell. Designed by physical therapists, the Stabilizer registers changing pressure in an air-filled pressure cell allowing body movements to be detected during exercise (Lee .20164)