婴儿在日常生活中的定位,特别是关于活跃的颈部和背部肌肉,可能会影响脊柱发育,社会心理发展,和电机里程碑成就。然而,婴儿身体位置对肌肉活动的影响尚不清楚。这项研究的目的是评估健康婴儿在常见位置和婴儿设备中的颈部和背部肌肉活动。健康的足月婴儿(n=22,2-6个月)参加了这项实验研究。护理人员报告了每日睡眠和定位。使用表面肌电图(EMG)在五个位置测量颈椎旁和竖脊肌的活动:俯卧,仰卧,手持武器,被关在婴儿背带里,扣在汽车座椅上。计算平均滤波的EMG信号和肌肉活跃的时间。使用配对t检验将位置与俯卧状态进行比较。看护者报告说,婴儿每天清醒时间的12%容易,43%的婴儿仰卧装备,44%的人抱在怀里或直立在婴儿背带中。婴儿俯卧时表现出最高的竖脊肌活动,和最低的颈椎旁肌肉活动在汽车座椅。武器携带和婴儿穿着之间没有差异。对健康婴儿肌肉活动的首次评估支持了俯卧时间在婴儿早期脊柱发育中的重要性,因为它可以促进颈部和背部肌肉活动。携带婴儿在手臂或婴儿背带也可能有利于颈部肌肉发育,而长时间呆在汽车座椅或密封装置上可能对脊柱发育有害。
Infant positioning in daily life, particularly in relation to active neck and back muscles, may affect spinal development, psychosocial progression, and motor milestone achievement. Yet the impact of infant body position on muscle activity is unknown. The objective of this study was to evaluate neck and back muscle activity of healthy infants in common positions and baby devices. Healthy full-term infants (n = 22, 2-6 months) participated in this experimental study. Daily sleep and positioning were reported by caregivers. Cervical paraspinal and erector spinae muscle activity was measured using surface electromyography (EMG) in five positions: lying prone, lying supine, held in-arms, held in a baby carrier, and buckled into a car seat. Mean filtered EMG signal and time that muscles were active were calculated. Paired t-tests were used to compare positions to the prone condition. Caregivers reported that infants spent 12% of daily awake time prone, 43% in supine-lying baby gear, and 44% held in-arms or upright in a baby carrier. Infants exhibited highest erector spinae activity when prone, and lowest cervical paraspinal muscle activity in the car seat. No differences were found between in-arms carrying and babywearing. This first evaluation of the muscle activity of healthy infants supports the importance of prone time in infants\' early spinal development because it promotes neck and back muscle activity. Carrying babies in-arms or in baby carriers may also be beneficial to neck muscle development, while prolonged time spent in car seats or containment devices may be detrimental to spinal development.