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자료유형
학술저널
저자정보
저널정보
한국사회체육학회 한국사회체육학회지 한국사회체육학회지 제3권
발행연도
1995.05
수록면
175 - 185 (11page)

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초록· 키워드

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The purpose of this investigation was to determine the kinematic characteristics of book bag weight. on gait cycle and posture of adolescent youths 11-13 years of age. This study consisted of a two phase approach. In phase I, 61 students (11 -13 yrs) who transport their school materials in some type of book bag had their descriptive characteristics(age, height, weight.), anthropometric measures(shoulder width, arm length), and book bag weight determined. Additionally, students were asked to respond to questions on bag carriage and associated physical symptoms. In the second phase of this investigation, 10 students who best represented the group mean from a combined ranked score of height, arm length, and shoulder width were recruited for kinematic film analysis. Subjects participated in four trials: without bag(WO), one strap backpack (1BP), two strap backpack(2BP), and one strap athletic bag(ATH). Static standing and dynamic walking during one stride length at a self determined pace were analyzed from front and side views with a Panasonic 450 video camera(60 Hz). In the static standing condition, kinematic film analysis provided measures of shoulder angle and spinal angle in the frontal plane. In the dynamic walking condition, measures of stride length, stride frequency, head angle, trunk angle, head range, and trunk range were determined from digitized data. The effects of the trials (WO, 1BP, 2BP, andATH) were analyzed using a repeated measures ANOVA with the level of significance set at p<0.05. When significance was observed, a Tukey Post Hoc Test identified the specific mean trial differences. The results were summarized as follows: 1. A survey of 61 adolescent youths(11-13 yrs) provided that the backpack was most popular (91.9%) in carrying school materials and Backpacks were often carried(73.2 %) with only one strap. A majority of the students(65.5 %) described their book bags as heavy, medium(29.5%), and light weight(5.0%). The most commonly reported physical symptom was muscle soreness (67.2%), followed by back pain(50.8 %), numbness(24.5 %), and shoulder pain(14.7 %). 2. One strap bag carriage (1BP, ATH) caused a right shoulder elevation and a leftward curvature of the spine away from the weight of the book bag(p<.05). 3. The load of the book bags resulted in a decrease in stride length and an increase in stride frequency(p<.05). 4. A significantly greater forward lean was found during the backpack trials(1BP, 2BP). The backpack trials also restricted the angular range of motion when compared to WO or ATH (p<.05 ). 5. The head was tilted forward in all trials. This forward tilt was significantly greater for the trials in which only one bag strap was used(1BP, ATH). However, in the ATH trial the angular range of motion was more pronounced than during any other trial(p<.05).

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