Porter Shaun, Nantel Julie
School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, ON, Canada.
School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, ON, Canada.
Gait Posture. 2015 Feb;41(2):666-9. doi: 10.1016/j.gaitpost.2015.01.021. Epub 2015 Jan 30.
Postural control in the medial-lateral (ML) direction is of particular interest regarding the assessment of changes in postural control, as it is highly related to the risk of falling.
To determine the postural strategies used to regain balance following a voluntary lateral step and compare these strategies between young and older adults.
Sixteen older adults (60-90 years) and 14 young adults (20-40 years) were asked to stand quietly for 30s, walk in place and then take a lateral step and stand quietly (30s). Balance Post was divided into 10s intervals. Center of pressure displacement (CoP) and velocity (VCoP) in the anterio-posterior (AP) and ML directions were analyzed.
In both groups, CoP and VCoP in AP and ML increased in Post1 compared to Pre (P<0.001). Dissimilar to young adults, VCoP-Post2, Post3 ML were larger than Pre (P=0.01) in older adults. Age correlated with all VCoP (Pre and Post) in both ML (P<0.05) and AP directions (P<0.01).
Dissimilar to young adults, older adults use different postural strategies in ML and AP directions and prioritized postural stability in the AP direction to recover balance after completing a lateral step. In the ML direction, older adults took up to 30s to regain balance. Considering that age was related to larger CoP displacement and velocity, the AP strategy to recover postural balance following a lateral step could become less efficient as older adults age and therefore increasing the risk of falls.
在评估姿势控制变化时，内侧-外侧（ML）方向的姿势控制尤为重要，因为它与跌倒风险高度相关。
确定在自愿侧向跨步后用于恢复平衡的姿势策略，并比较年轻人和老年人之间的这些策略。
16名老年人（60-90岁）和14名年轻人（20-40岁）被要求安静站立30秒，原地行走，然后进行侧向跨步并安静站立（30秒）。将平衡测试分为10秒间隔。分析前后（AP）和ML方向的压力中心位移（CoP）和速度（VCoP）。
在两组中，与Pre相比，Post1中AP和ML方向的CoP和VCoP均增加（P<0.001）。与年轻人不同，老年人中VCoP-Post2、Post3 ML大于Pre（P=0.01）。年龄与ML（P<0.05）和AP方向（P<0.01）的所有VCoP（Pre和Post）均相关。
与年轻人不同，老年人在ML和AP方向使用不同的姿势策略，并在完成侧向跨步后优先考虑AP方向的姿势稳定性以恢复平衡。在ML方向，老年人需要长达30秒才能恢复平衡。考虑到年龄与更大的CoP位移和速度相关，随着老年人年龄增长，侧向跨步后恢复姿势平衡的AP策略可能会变得效率降低，从而增加跌倒风险。
