Coordination of head and trunk accelerations during walking
Coordination of head and trunk accelerations during walking
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DOI：
10.1007/s00421-005-1328-1
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发表时间：
2005-07-01
影响因子：
3
通讯作者：
Barrett, RS
中科院分区：
文献类型：
--
作者：
Kavanagh, J;Morrison, S;Barrett, RS
本研究的目的是探讨步行过程中头部和躯干在各个运动平面上的振荡动力学之间的关系。用一对三轴加速度计测量了10名健康受试者(年龄23+/-4岁)在垂直(VT)、前后(AP)和内侧(ML)方向上的头部和躯干加速度。所有受试者都以他们喜欢的步态速度(S(-1)1.30+/-0.15米)在水平20米步道上进行了5次步行试验。使用功率谱、谐波和规律性测量对加速度数据进行分析。结果表明：(1)头部振动更平稳，低频功率所占比例大于躯干振动；(2)在ML方向，头部和躯干功率谱特性差异最明显；(3)VT-AP、VT-ML和AP-ML加速度之间的耦合头部大于躯干；(4)AP-ML加速度关系在两个节段的耦合最弱。总体而言，这项研究的结果表明，与躯干下部的加速相比，头部的加速明显减弱，而且控制更严格。这种衰减过程对于ML方向尤其明显，因此头部加速度与躯干ML加速度相比显示出最大的差异。
The purpose of this study was to investigate the relationship between oscillatory dynamics of the head and trunk in each plane of motion during walking. Head and trunk accelerations of ten healthy subjects (age: 23 +/- 4 years) were measured in the vertical (VT), anterior-posterior (AP) and mediolateral (ML) directions using a pair of tri-axial accelerometers. All subjects performed five walking trials along a level 20 m walkway at their preferred gait velocity (1.30 +/- 0.15 m s(-1)). Acceleration data were analysed using power spectral, harmonic and regularity measures. Results indicated that: (1) oscillations of the head were smoother, with a greater proportion of power at lower frequencies than oscillations of the trunk, (2) differences in power spectral properties between the head and trunk were most pronounced in the ML direction, (3) coupling between VT-AP, VT-ML, and AP-ML accelerations were greater for the head than trunk, and (4) for both segments, the weakest coupling was observed for AP-ML acceleration relations. Overall, the results of this study suggest that accelerations of the head are significantly attenuated, and more tightly controlled, compared to accelerations of the lower trunk. This attenuation process was particularly evident for the ML direction, whereby head accelerations showed the greatest differences compared to ML accelerations at the trunk.