Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (36): 5814-5820.doi: 10.12307/2021.348

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Surface electromyography characteristics of lower limbs in heterogeneous gait environment

Zhang Peng1, 2, Zhang Junxia1, 2   

  1. 1School of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China; 2Tianjin Key Laboratory of Integrated Design and Online Monitoring for Light Industry and Food Engineering Machinery and Equipment, Tianjin University of Science & Technology, Tianjin 300222, China
  • Received:2021-02-27 Revised:2021-03-10 Accepted:2021-04-23 Online:2021-12-28 Published:2021-09-17
  • Contact: Zhang Junxia, MD, Professor, School of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China; Tianjin Key Laboratory of Integrated Design and Online Monitoring for Light Industry and Food Engineering Machinery and Equipment, Tianjin University of Science & Technology, Tianjin 300222, China
  • About author:Zhang Peng, Doctoral candidate, School of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China; Tianjin Key Laboratory of Integrated Design and Online Monitoring for Light Industry and Food Engineering Machinery and Equipment, Tianjin University of Science & Technology, Tianjin 300222, China
  • Supported by:
    Tianjin Science and Technology Support Program Funded Project, No. 14ZCZDSY00010 (to ZJX); the Tianjin Postgraduate Research and Innovation Project in 2019, No. 2019YJSB014 (to ZP)

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Abstract: BACKGROUND: Human walking is closely related to the changes of the surface electromyography signal of the lower limbs, but the difference of electromyography signal under the heterogeneous gait environment has not been studied in depth.  
OBJECTIVE: To quantitatively analyze the differences of surface electromyography signals of lower limb muscles in heterogeneous gait environments, and study muscle characteristics of lower limb muscles in different phases in heterogeneous footpaths.
METHODS:  Twenty healthy male subjects were recruited. The surface electromyography signals of lower limb muscles were collected in the environment of straight road, curve road, ramp, and stairs. A complete gait cycle was divided into four phases: the first dual support phase (0%-12%), the single support phase (13%-48%), and the second dual support phase (49%-60%) and swing phase (61%-100%). The muscle activation timing and difference of surface electromyography signal in different gait environments were studied through one-way analysis of variance. This study was approved by the Research Ethics Committee of Tianjin University of Science & Technology.  
RESULTS AND CONCLUSION: (1) The study showed that compared with the straight path environment, in the process of making turn, the internal and external rotation muscles (Biceps Femoris, Gastrocnemius Medialis, Tibialis Anterior) of hip joint and ankle joint were used to complete the turn. When going upstairs and uphill, in the stage of single support phase, Vastus Lateralis and Vastus Medialis had the most significant difference (P < 0.05), and muscle strength increased significantly. In the second double support phase, the amplitude of Gastrocnemius Medialis increased significantly. When going downstairs and downhill, in the first dual support phase, Vastus Lateralis and Vastus Medialis were required to exert additional assistance. In the single support phase, the amplitudes of Gastrocnemius Medialis and Semitendinosus were significantly increased. In the second double support phase, the amplitude of Gastrocnemius Medialis decreased significantly. (2) The research results can provide reference value for the research and development of the control system of lower limb rehabilitation walking aid.

Key words: gait analysis, surface electromyography, activation timing, difference of surface electromyography signal

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