Association between energy cost of walking, muscle activation, and biomechanical parameters in older female fallers and non-fallers
Association between energy cost of walking, muscle activation, and biomechanical parameters in older female fallers and non-fallers
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DOI：
10.1016/j.clinbiomech.2013.01.004
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发表时间：
2013-03-01
影响因子：
1.8
通讯作者：
Goncalves, Mauro
中科院分区：
文献类型：
--
作者：
Marques, Nise Ribeiro;LaRoche, Dain Patrick;Goncalves, Mauro
目的：确定影响老年跌倒与非跌倒患者步行成本的神经活动、肌肉力量和生物力学参数。方法：测量老年女性髋关节、膝关节和踝关节的最大自主等速扭矩。测定安静时和自主选择速度步行8min时的氧耗量。再进行一分钟步行，收集运动学变量和躯干、髋关节、膝盖和脚踝肌肉的肌电信号，并用线性包络进行分析。步行成本的计算方法是从步行体重归一化耗氧量中减去静息体质量归一化耗氧量。根据运动学数据计算步态时间和长度，以及踝关节和髋关节的活动范围。结果：在每个步态阶段，老年跌倒者膝关节伸肌力量降低28%(p=0.02)，脚跟接触时内斜肌活动度降低47%(p=0.03)，胫前肌和腓肠肌外侧肌之间的协同激活程度较高(p=0.03)。
Objective: To determine the nervous activation, muscle strength, and biomechanical parameters that influence the cost of walking in older fallers and non-fallers.Methods: Maximal voluntary isokinetic torque was measured for the hip, knee and ankle of older women. Oxygen consumption was measured at rest and during 8 min of walking at self-selected speed. An additional minute of walking was performed to collect kinematic variables and the electromyographic signal of trunk, hip, knee, and ankle muscles, which was analyzed by the linear envelope. Cost of walking was calculated by subtracting resting body mass-normalized oxygen consumption from walking body mass-normalized oxygen consumption. Stride time and length, and ankle and hip range of motion were calculated from kinematic data.Findings: Older adult fallers had 28% lower knee extensor strength (p=0.02), 47% lower internal oblique activation at heel contact (p=0.03), and higher coactivation between tibialis anterior and gastrocnemius lateralis in each of the gait phases (p