Nigg Benno, Hintzen Sabrina, Ferber Reed
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Alberta, Canada.
Clin Biomech (Bristol). 2006 Jan;21(1):82-8. doi: 10.1016/j.clinbiomech.2005.08.013. Epub 2005 Oct 4.
To compare kinematics, kinetics and muscle activity during standing and walking for healthy subjects using an unstable test shoe (Masai Barefoot Technology, MBT) and a stable control shoe.
Eight subjects volunteered for this study. During quiet standing, center of pressure excursion and muscle activity were determined. During walking, lower extremity kinematics, kinetics, and muscle electromyographic (EMG) signals were determined. Data were collected for the two shoe conditions after a 2week accommodation period. Statistics included repeated measures ANOVAs (alpha = 0.05) and post hoc tests where appropriate.
During quiet standing, the center of pressure excursion was significantly and substantially greater in the unstable compared to the control shoe. Electromyographic intensity increased in the unstable test shoe for all tested muscles, but only significantly for the tibialis anterior. During locomotion, kinematics were similar in the two shoe conditions except for the initial plantar-dorsiflexion, which showed a significant more dorsiflexed position during the first half of stance in the unstable test shoe compared to the stable control shoe. The angular impulses did not show any significant differences between the two shoe conditions for all three joints but some trends towards a reduction for the knee and hip joint. There were no significant differences in electromyographic activities between the control and the unstable shoe. However, several muscles showed some trends.
The unstable shoe produced changes and trends in kinematic, kinetic and electromyographic characteristics that seemed to be advantageous for the locomotor system. Further studies should investigate muscle strength, dynamic stability, pain reduction for arthritic knees and injury prevention for high performance athletes when using the unstable shoes.
比较健康受试者在站立和行走过程中，使用不稳定测试鞋（马赛赤足技术，MBT）和稳定对照鞋时的运动学、动力学和肌肉活动情况。
八名受试者自愿参与本研究。在安静站立期间，测定压力中心偏移和肌肉活动。在行走期间，测定下肢运动学、动力学和肌肉肌电图（EMG）信号。在经过2周的适应期后，针对两种鞋的情况收集数据。统计分析包括重复测量方差分析（α = 0.05）以及在适当情况下的事后检验。
在安静站立期间，与对照鞋相比，不稳定鞋的压力中心偏移显著且大幅增大。在不稳定测试鞋中，所有测试肌肉的肌电图强度均增加，但仅胫骨前肌有显著增加。在运动过程中，两种鞋的情况下运动学情况相似，只是初始跖屈 - 背屈有所不同，与稳定对照鞋相比，不稳定测试鞋在站立前半程的背屈位置更显著。对于所有三个关节，两种鞋的角冲量均未显示出任何显著差异，但膝关节和髋关节有一些减小的趋势。对照鞋和不稳定鞋之间的肌电图活动没有显著差异。然而，几块肌肉呈现出一些趋势。
不稳定鞋在运动学、动力学和肌电图特征方面产生了一些变化和趋势，这些变化和趋势似乎对运动系统有利。进一步的研究应调查使用不稳定鞋时对肌肉力量、动态稳定性、膝关节炎疼痛减轻以及高性能运动员的损伤预防情况。
