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KMID : 1211620140090010092
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Journal of the Korean Society of Physical Medicine
2014 Volume.9 No. 1 p.92 ~ p.99
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Age Effects on Center of Mass during Obstacle Crossing
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손남국:Son Nam-Kuk
김형동:Kim Hyeong Dong
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Abstract
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PURPOSE : The purpose of this study was to compare three dimensional displacement and peak velocity of the center of mass (COM) during obstacle crossing in young and older adults.
METHODS : 10 young adults (6 males/4 females, 24.6±1.9 years, age range: 22.0-26.9) and 10 older adults (1 male/9 females, 76.9±5.1 years, age range: 65.2-81.2) participated in the study. Both groups crossed an obstacle, which is 10% of leg length, and COM was measured using motion analysis system. Independent t-test was used to find significant differences between two groups.
RESULTS : The older adults showed significantly greater and faster COM displacement and peak velocity in mediolateral (M-L) direction as compared with young adults (p<.01 and p<.001 respectively). However, the young adults showed significantly greater and faster COM displacement and peak velocity in anteroposterior (A-P) direction as compared with older adults (p<.05 and p<.001 respectively). Furthermore, the young adults showed faster peak velocity of COM in vertical direction as compared with older adults(p<.001). However, no significant difference was found in the COM displacement in vertical direction between two groups.
CONCLUSION : Greater and faster COM displacement and peak velocity in M-L direction in older adults were due to compensatory adjustment for appropriate contact on base of support of swing limb. Thus, the motion of the COM in M-L direction may be a crucial factor to identify risk of falls in older adults.
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KEYWORD
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Ageing, Center of mass, Falls, Obstacle crossing
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