Department of Physical Therapy, Temple University, Philadelphia, PA, USA.
Gait Posture. 2010 Jan;31(1):136-9. doi: 10.1016/j.gaitpost.2009.09.015. Epub 2009 Oct 23.
The use of surface electromyography (sEMG) recorded during ambulation has provided valuable insight into motor development and changes with age in the pediatric population. However, no studies have reported sEMG differences with age in the children with cerebral palsy (CP). In this study, data from 50 children were divided retrospectively into four groups, representing either an older (above the age of seven years) or younger (below the age of seven years) age group with either typical development (TD) or CP. Data were analyzed from 16 children in the younger age group with TD, and eight in the older age group with TD. Data were also available from 14 in the younger age group with CP, and 12 in the older age group with CP. SEMG signals from the rectus femoris (RF) and medial hamstring (MH) were analyzed using wavelet techniques to examine time-frequency content. RF muscle activity was statistically different between all groups (p<0.001), with an elevated instantaneous mean frequency (IMNF) in the older TD group than the younger TD group, an elevated IMNF in the younger CP group than the older CP group, and elevated IMNF in both CP groups compared to both TD groups. Activity for the MH muscle followed the same pattern except for the CP young and old group comparison, which indicated no difference. The results indicate that differences in neuromuscular activation exist between younger and older groups of children with both TD and CP, and may provide new insight into muscle activity pattern changes during the development of walking.
表面肌电图（sEMG）在行走过程中的应用为儿童运动发育和年龄变化提供了有价值的见解。然而，目前还没有研究报道脑瘫（CP）儿童的 sEMG 随年龄的差异。在这项研究中，回顾性地将 50 名儿童的数据分为四组，分别代表年龄较大（7 岁以上）或较小（7 岁以下）的儿童，以及具有典型发育（TD）或 CP 的儿童。对年龄较小的 TD 组中的 16 名儿童和年龄较大的 TD 组中的 8 名儿童进行了数据分析。年龄较小的 CP 组中有 14 名儿童和年龄较大的 CP 组中有 12 名儿童的数据也可用。使用小波技术分析股直肌（RF）和内侧腘绳肌（MH）的 sEMG 信号，以检查时频内容。RF 肌肉活动在所有组之间均存在统计学差异（p<0.001），与年轻的 TD 组相比，年长的 TD 组的瞬时平均频率（IMNF）升高，与年长的 CP 组相比，年轻的 CP 组的 IMNF 升高，与两个 TD 组相比，两个 CP 组的 IMNF 升高。MH 肌肉的活动遵循相同的模式，但 CP 组的年轻和老年组之间的比较表明没有差异。结果表明，TD 和 CP 儿童的年轻和年长组之间存在神经肌肉激活的差异，这可能为行走发育过程中肌肉活动模式的变化提供新的见解。
