Abstract

This study aimed to characterize muscle activation and its variability during two-legged hopping in children with and without Down syndrome (DS). Seventeen typically developing (TD) children and 15 children with DS were recruited. As only 6 children with DS (4F/2M, 9.95 (1.71) years) completed the test, we used a 2(TD):1(DS) ratio to age- and sex-match 12 TD children. Subjects first hopped at a self-selected free frequency and then three metronome-cued conditions: slow, preferred, and moderate (80%, 100%, and 120% of free frequency, respectively). Across conditions, children with DS exhibited greater pre-activation before landing and greater shape and timing variability in gastrocnemius, vastus lateralis, and biceps femoris than TD children. However, this compensatory strategy limited their ability to change movement speed.

摘要

本研究旨在表征患有和未患有唐氏综合症 (DS) 的儿童在两条腿跳跃过程中的肌肉激活及其变异性。招募了 17 名典型发育 (TD) 儿童和 15 名患有 DS 的儿童。由于只有 6 名患有 DS 的儿童（4F/2M，9.95 (1.71) 岁）完成了测试，我们使用 2(TD):1(DS) 比率来匹配年龄和性别匹配的 12 名 TD 儿童。受试者首先以自选的自由频率跳跃，然后在三个节拍器提示条件下跳跃：慢速、首选和中等（分别为自由频率的 80%、100% 和 120%）。在各种情况下，与 TD 儿童相比，DS 儿童在着陆前表现出更大的预激活，腓肠肌、股外侧肌和股二头肌的形状和时间变化更大。然而，这种补偿策略限制了他们改变移动速度的能力。