Previous evidence of increased difference of muscular strength between the dominant and non-dominant legs in older adults suggests the possibility of dissimilar balance control between the legs (between-leg asymmetry) associated with aging. In the current investigation, we evaluated between-leg asymmetries in older adults when performing quiet and dynamic balance tasks. Fifty-two physically active and healthy older adults within the age range of 60 to 80 years were recruited. Participants performed balance tasks in unipedal stance, including quiet standing and cyclic sway (rhythmic oscillation) of the non-supporting leg in the anteroposterior or mediolateral directions, producing foot displacements with amplitudes of 20 cm paced in 1 Hz through a metronome. Body balance was evaluated through trunk accelerometry, by using the sensors embedded into a smartphone fixed at the height of the 10th-12th thoracic spines. Analysis revealed lack of significant differences in balance control between the legs either when comparing the right versus left or the preferred versus non-preferred legs, regardless of whether they were performing quiet stance or dynamic tasks. Further examination of the data showed high between-leg correlation coefficients ( range: 0.71–0.84) across all tasks. Then, our results indicated symmetric and associated between-leg balance control in the examined older adults.

中文翻译：

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老年人安静姿势和动态任务中的对称单足平衡

先前的证据表明，老年人的优势腿和非优势腿之间的肌肉力量差异增加，这表明与衰老相关的腿部之间的平衡控制（腿间不对称）可能不同。在当前的调查中，我们评估了老年人在执行安静和动态平衡任务时的腿间不对称性。招募了 52 名年龄在 60 至 80 岁之间、身体活跃且健康的老年人。参与者以单足站立执行平衡任务，包括安静站立和非支撑腿在前后或中间方向上的循环摇摆（有节奏的振荡），通过节拍器以 1 Hz 的速度产生幅度为 20 厘米的足部位移。身体平衡通过躯干加速度测量进行评估，使用嵌入固定在第 10-12 胸椎高度的智能手机中的传感器。分析显示，无论是在执行安静姿势还是动态任务时，在比较右腿与左腿或首选腿与非首选腿时，腿之间的平衡控制都缺乏显着差异。对数据的进一步检查显示，所有任务的腿间相关系数都很高（范围：0.71-0.84）。然后，我们的结果表明，受检查的老年人具有对称且相关的腿间平衡控制。