Naik Ganesh R, Al-Ani Ahmed, Gobbo Massimiliano, Nguyen Hung T
Centre for Health Technologies, Faculty of Engineering and IT, University of Technology SydneySydney, NSW, Australia.
Biomedical Engineering and Neuroscience Research Group, The MARCS Institute for Brain, Behaviour and Development, Western Sydney UniversityKingswood, NSW, Australia.
Front Physiol. 2017 Aug 28;8:626. doi: 10.3389/fphys.2017.00626. eCollection 2017.
The purpose of this study was to determine whether electromyography (EMG) muscle activities around the knee differ during sit-to-stand (STS) and returning task for females wearing shoes with different heel heights. Sixteen healthy young women (age = 25.2 ± 3.9 years, body mass index = 20.8 ± 2.7 kg/m) participated in this study. Electromyography signals were recorded from the two muscles, vastus medialis (VM) and vastus lateralis (VL) that involve in the extension of knee. The participants wore shoes with five different heights, including 4, 6, 8, 10, and 12 cm. Surface electromyography (sEMG) data were acquired during STS and stand-to-sit-returning (STSR) tasks. The data was filtered using a fourth order Butterworth (band pass) filter of 20-450 Hz frequency range. For each heel height, we extracted median frequency (MDF) and root mean square (RMS) features to measure sEMG activities between VM and VL muscles. The experimental results (based on MDF and RMS-values) indicated that there is imbalance between vasti muscles for more elevated heels. The results are also quantified with statistical measures. The study findings suggest that there would be an increased likelihood of knee imbalance and fatigue with regular usage of high heel shoes (HHS) in women.
本研究的目的是确定对于穿着不同鞋跟高度鞋子的女性，在从坐起到站立（STS）以及返回任务过程中，膝关节周围的肌电图（EMG）肌肉活动是否存在差异。16名健康年轻女性（年龄 = 25.2 ± 3.9岁，体重指数 = 20.8 ± 2.7 kg/m²）参与了本研究。从涉及膝关节伸展的两块肌肉，即股内侧肌（VM）和股外侧肌（VL）记录肌电图信号。参与者穿着五种不同高度的鞋子，包括4厘米、6厘米、8厘米、10厘米和12厘米。在STS和从站到坐再返回（STSR）任务期间采集表面肌电图（sEMG）数据。使用频率范围为20 - 450 Hz的四阶巴特沃斯（带通）滤波器对数据进行滤波。对于每个鞋跟高度，我们提取中频（MDF）和均方根（RMS）特征来测量VM和VL肌肉之间的sEMG活动。实验结果（基于MDF和RMS值）表明，鞋跟越高，股肌之间的不平衡越明显。结果也用统计方法进行了量化。研究结果表明，女性经常穿着高跟鞋（HHS）会增加膝关节失衡和疲劳的可能性。
