Movement smoothness during dynamic postural control to a static target differs between autistic and neurotypical children.
Movement smoothness during dynamic postural control to a static target differs between autistic and neurotypical children.
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DOI：
10.1016/j.gaitpost.2022.10.015
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发表时间：
2023-01
期刊：
影响因子：
2.4
通讯作者：
Bugnariu, Nicoleta L.
中科院分区：
文献类型：
--
作者：
Miller, Haylie L.;Templin, Tylan N.;Fears, Nicholas E.;Sherrod, Gabriela M.;Patterson, Rita M.;Bugnariu, Nicoleta L.
自闭症儿童和成人在运动表现方面存在已知的差异，包括姿势不稳定和非典型的粗大运动控制。很少有研究专门测试动态姿势控制。这是第一个研究量化运动平滑度及其与自闭症患者横向动态姿势控制任务中任务表现的关系。我们试图检验这一假设，即自闭症儿童与神经型儿童相比，对侧向静态目标的运动不那么流畅，这种差异与特定的运动策略有关。我们使用基于相机的运动捕捉来测量放置在C7椎骨上的标记的横向运动的时空特性，以及在沉浸式虚拟环境中管理的近和远目标的动态姿势运动期间包括躯干和骨盆段的标记的时空特性。我们测试了15名自闭症儿童和11名年龄匹配的神经正常儿童的样本。我们量化运动平滑使用日志无量纲加加速度。自闭症儿童表现出更多的内外侧骨盆位置的运动范围相比，神经型儿童，并使用了一个步进策略更经常相比，神经型儿童。自闭症儿童也有较高的日志无量纲挺举比神经型儿童的运动的C7标记。所有参与者都有较高的日志无量纲挺举远目标比近目标。自闭症儿童的试验持续时间比神经型儿童长，在诊断组中，年龄较小的儿童的试验持续时间比年龄较大的儿童长。在自闭症组中观察到的更常见的步进策略可能有助于记录无量纲的颠簸和减少运动的平滑度。这一策略表明，要么试图防止即将发生的平衡丧失，要么试图在发现平衡丧失后进行补偿和恢复。
Autistic children and adults have known differences in motor performance, including postural instability and atypical gross motor control. Few studies have specifically tested dynamic postural control. This is the first study to quantify movement smoothness and its relationship to task performance during lateral dynamic postural control tasks in autism. We sought to test the hypothesis that autistic children would have less smooth movements to lateral static targets compared to neurotypical children, and that this difference would relate to specific movement strategies. We used camera-based motion-capture to measure spatiotemporal characteristics of lateral movement of a marker placed on the C7 vertebrae, and of markers comprising trunk and pelvis segments during a dynamic postural movements to near and far targets administered in an immersive virtual environment. We tested a sample of 15 autistic children and 11 age-matched neurotypical children. We quantified movement smoothness using log dimensionless jerk. Autistic children exhibited more medial-lateral pelvic position range of motion compared to neurotypical children, and used a stepping strategy more often compared to neurotypical children. Autistic children also had higher log dimensionless jerk than neurotypical children for motion of the C7 marker. All participants had higher log dimensionless jerk for far targets than for near targets. Autistic children had longer trial durations than neurotypical children, and younger children had longer trial durations than older children across diagnostic groups. The stepping strategy observed more often in the autistic group likely contributed to log dimensionless jerk and reduced movement smoothness. This strategy is indicative of either an attempt to prevent an impending loss of balance, or an attempt to compensate for and recover from a loss of balance once it is detected.
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