年龄相关的双边运动协同和力量协调缺陷。
Age-related deficits in bilateral motor synergies and force coordination.
机构信息
Division of Sport Science and Sport Science Institute, Incheon, South Korea.
Neuromechanical Rehabilitation Research Laboratory, Incheon National University, Incheon, South Korea.
出版信息
BMC Geriatr. 2019 Oct 24;19(1):287. doi: 10.1186/s12877-019-1285-x.
BACKGROUND
Ageing may cause impairments in executing bilateral movement control. This study investigated age-related changes in interlimb force coordination across multiple trials by quantifying bilateral motor synergies based on the uncontrolled manifold hypothesis. Participants completed the trials with and without visual feedback.
METHODS
Twenty healthy individuals (10 older adults and 10 young adults) performed 12 isometric force control trials for the two vision conditions at 5% of maximal voluntary contraction. All dependent variables were analyzed in two-way mixed model (Group × Vision Condition; 2 × 2) ANOVAs with repeated measures on the last factor.
RESULTS
The analyses revealed that older adults had greater mean force produced by two hands in both vision conditions (i.e., yes and no visual feedback). Across both vision conditions, the older adult group showed greater asymmetrical force variability (i.e., standard deviation of non-dominant hand > standard deviation of dominant hand) and revealed more positive correlation coefficients between forces produced by two hands as compared with the young adult group. Finally, an index of bilateral motor synergies was significantly greater in young adults than older adults when visual feedback was available.
CONCLUSION
The current findings indicate that deficits in interlimb force coordination across multiple trials appeared in older adults.
背景
衰老可能导致执行双侧运动控制的能力受损。本研究通过基于非控制流形假说量化双边运动协同作用，研究了多个试验中与年龄相关的四肢间力协调变化。参与者在有和没有视觉反馈的情况下完成了这些试验。
方法
20 名健康个体（10 名老年人和 10 名年轻人）在 5%最大自主收缩的两种视觉条件下完成了 12 次等长力控制试验。所有因变量均在混合模型（组×视觉条件；2×2）方差分析中进行了双因素分析，最后一个因素进行了重复测量。
结果
分析表明，老年人在两种视觉条件下双手产生的平均力都较大（即有和没有视觉反馈）。在两种视觉条件下，与年轻组相比，老年组的非优势手的力变异性更大（即标准偏差大于优势手），并且两手产生的力之间的相关性系数更大。最后，当有视觉反馈时，年轻成年人的双边运动协同指数明显大于老年人。
结论
目前的研究结果表明，在多次试验中，四肢间力协调的缺陷出现在老年人中。
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