■人类上肢的特征是固有的运动丰富,允许具有敏捷性和适应性的各种任务。上肢功能受限是中风的常见后遗症,导致对侧臂明显的运动和感觉障碍。虽然许多治疗干预措施侧重于恢复较弱的手臂,越来越明显的是,有必要考虑双手协调和运动控制。
■参与者被招募到年龄不同的两组(第1组(n=10):23.4±2.9岁,第2组(n=10):55.9±10.6年),用于使用加速度计量化双侧协调的探索性研究。选择了三个具有协调伸手功能的任务来研究上臂的加速度,前臂,并在日常生活活动(ADL)期间用手。受试者在每个上臂上都配备了加速度和倾斜度传感器,每个前臂,每一只手。在MATLAB中对数据进行分段以评估肢体间和肢体内协调。通过不同指数和上臂之间同步运动的时间位置来表明肢体间的协调,前臂,或左右肢体的手部部分。上臂-前臂之间同样评估了肢体内协调,上臂手,和优势肢的前臂-手段对。
■加速度数据揭示了三个不同任务中特定任务的运动特征。随着任务复杂性的增加,组的相似性降低。在按扣任务期间,各组在手段上存在显着差异,第1组在按扣期间在手段中没有显示协调,与上臂和前臂引导延伸的每个按钮和强大的协调。第2组的相异分数和相似百分比表明肢体间协调时间较长,特别是走向运动完成。第1组的相异分数和相似百分比表明肢体内协调时间较长,特别是在上臂和前臂段的协调。
■扩展Procrustes方法可用于使用可访问且高度精确的可穿戴加速度传感器计算客观协调分数。任务持续时间的发现,角速度,和峰值侧倾角得到了先前研究的支持,发现老年人表现出较慢的运动,降低运动稳定性,和减少四肢之间的偏侧性。在35岁以上的受试者组中发现更大的肢体间协调性,这支持了随着年龄的增长向双灵巧转变的理论。发现30岁以下的人群表现出更长的肢体内协调时间,上臂和前臂的协调性成为证明更大稳定性的可能解释。
UNASSIGNED: The human upper extremity is characterized by inherent motor abundance, allowing a diverse array of tasks with agility and adaptability. Upper extremity functional limitations are a common sequela to Stroke, resulting in pronounced motor and sensory impairments in the contralesional arm. While many therapeutic interventions focus on rehabilitating the weaker arm, it is increasingly evident that it is necessary to consider bimanual coordination and motor control.
UNASSIGNED: Participants were recruited to two groups differing in age (Group 1 (n = 10): 23.4 ± 2.9 years, Group 2 (n = 10): 55.9 ± 10.6 years) for an exploratory study on the use of accelerometry to quantify bilateral coordination. Three tasks featuring coordinated reaching were selected to investigate the acceleration of the upper arm,
forearm, and hand during activities of daily living (ADLs). Subjects were equipped with acceleration and inclination sensors on each upper arm, each
forearm, and each hand. Data was segmented in MATLAB to assess inter-limb and intra-limb coordination. Inter-limb coordination was indicated through dissimilarity indices and temporal locations of congruous movement between upper arm,
forearm, or hand segments of the right and left limbs. Intra-limb coordination was likewise assessed between upper arm-
forearm, upper arm-hand, and
forearm-hand segment pairs of the dominant limb.
UNASSIGNED: Acceleration data revealed task-specific movement features during the three distinct tasks. Groups demonstrated diminished similarity as task complexity increased. Groups differed significantly in the hand segments during the buttoning task, with Group 1 showing no coordination in the hand segments during buttoning, and strong coordination in reaching each button with the upper arm and forearm guiding extension. Group 2\'s dissimilarity scores and percentages of similarity indicated longer periods of inter-limb coordination, particularly towards movement completion. Group 1\'s dissimilarity scores and percentages of similarity indicated longer periods of intra-limb coordination, particularly in the coordination of the upper arm and forearm segments.
UNASSIGNED: The Expanding Procrustes methodology can be applied to compute objective coordination scores using accessible and highly accurate wearable acceleration sensors. The findings of task duration, angular velocity, and peak roll angle are supported by previous studies finding older individuals to present with slower movements, reduced movement stability, and a reduction of laterality between the limbs. The theory of a shift towards ambidexterity with age is supported by the finding of greater inter-limb coordination in the group of subjects above the age of thirty-five. The group below the age of thirty was found to demonstrate longer periods of intra-limb coordination, with upper arm and
forearm coordination emerging as a possible explanation for the demonstrated greater stability.