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

Background: Circadian rhythm plays an important role in our biophysiological functions, also affects the human performance and effective movements, but little researches had been conducted on the body type in relation to the influence of time of day on motor ability such as body balance. The Purpose: this study was conducted to investigate the influence of circadian rhythm on dynamic balance. Subjects: Forty healthy male physical therapists with mean age 24.15+3.32 years, mean weight 69.25+6.67 kilogram (kg), mean height 176.5+7.66 centimeters (cm), and mean BMI 22.16+1.4 kg/m2. Subject's personality type was determined by morningness/eveningness scale and then assigned to two equal groups. Methods: Subject's dynamic balance was measured by the biodex balance system on the morning (8 am) and on the evening (2 pm ) for both groups, post hoc tests were done to determine the significant difference in the dynamic balance at different times, also the difference between the morning and evening tested groups. Results: The result revealed that there was statistical significant difference in dynamic balance (Overall stability, anterior /posterior stability and medial /lateral stability) at different times of day according to subject's personality type in each group. But, there was no statistical significant difference between both groups (over all stability and anterior/posterior stability), except for medial/lateral stability which decreased in the evening group (group B) than morning group (group A)

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