Kim Ji-Won, Kwon Yuri, Ho Yeji, Jeon Hyeong-Min, Bang Min-Jung, Jun Jae-Hoon, Eom Gwang-Moon, Park Byung Kyu, Cho Yeong Bin
School of Biomedical Engineering, Konkuk University, Choonju, 380-701, Korea.
School of Biomedical Engineering, Konkuk University, Choonju, 380-701, Korea Research Institute of Biomedical Engineering, Konkuk University, Choonju, 380-701, Korea.
Biomed Mater Eng. 2014;24(6):2707-13. doi: 10.3233/BME-141088.
Incidence of falling among elderly female has been reported to be much higher than that of elderly male. Although the gender differences in the elderly were reported for the static postural sway, there has been no investigation of the gender difference for the dynamic postural sway. This study investigates how age and gender affect the postural sway during dynamic squat and stand-up movement. 124 subjects (62 subjects for each of young and elderly) performed consecutive squat and stand-up movement, 2 times in one session, and 2 sessions per subject. Center of pressure (COP) was measured using force platform during the test. Outcome measures included peak-to-peak sways of the COP (COP sway) in the sagittal plane (anteroposterior) and frontal plane (mediolateral) and also those normalized by body height. Two-way ANOVA and post-hoc comparisons were performed for the outcome measures with the independent factors of age and gender. All outcome measures, excluding mediolateral COP sway, showed significant interaction of age and gender (p<0.05). Post-hoc test revealed that only female showed increase in COP sway with age. When normalized by height, increase in COP sways (both directions) with age significant only in women resulted in greater sways in elderly female than elderly male. This may be related to the greater fall rate of elderly female than that of elderly men while performing dynamic activities.
据报道，老年女性跌倒的发生率远高于老年男性。虽然已有研究报告了老年人在静态姿势摆动方面的性别差异，但尚未对动态姿势摆动的性别差异进行调查。本研究调查了年龄和性别如何影响动态蹲起运动中的姿势摆动。124名受试者（年轻组和老年组各62名）进行连续的蹲起运动，每次进行2次，每人进行2组。测试过程中使用测力平台测量压力中心（COP）。结果指标包括COP在矢状面（前后方向）和额状面（内外方向）的峰峰值摆动，以及按身高标准化后的摆动值。对结果指标进行双向方差分析，并以年龄和性别为独立因素进行事后比较。除内外方向的COP摆动外，所有结果指标均显示年龄和性别的显著交互作用（p<0.05）。事后检验显示，只有女性的COP摆动随年龄增加。按身高标准化后，COP摆动（两个方向）随年龄增加仅在女性中显著，导致老年女性的摆动大于老年男性。这可能与老年女性在进行动态活动时比老年男性更高的跌倒率有关。
