Abstract
Objective : The purpose of this study was to conduct biomechanical analysis of varying backpack loads on the lower limb movements during downhill walking over ramp. Method : Thirteen male university students (age: , height: , weight: ) who have no musculoskeletal disorder were recruited as the subjects. Each subject walked over ramp with four different backpack weights (0%, 10%, 20% and 30% of body weight) in random order at a speed of . Five digital camcorders and two force plates were used to obtain 3-d data and kinetics of the lower extremity. For each trial being analyzed, five critical instants were identified from the video recordings. Ground reaction force, loading rate, decay rate, and resultant joint moment of the ankle and the knee were determined by the inverse dynamics analysis. For each dependent variable, one-way ANOVA with repeated measures was used to determine whether there were significant differences among four different backpack weight conditions (p
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