Study on Kinematic and Dynamic Parameters for Chinese Cervical Manual Therapy
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    Abstract:

    Objective: To simultaneously collect and analyze the kinematic and dynamic parameters and surface electromyographic (sEMG) signal changes of two techniques of Chinese cervical manual therapy (CCMT), and to quantitatively describe the operation characteristics and biomechanical characteristics of the techniques. Methods: A senior practitioner completed the CCMT, including the cervical spine positioning and directional rotation pulling technique and cervical spine lateral flexion technique on 10 healthy subjects, and the fluorescent marker balls were pasted on the operator to capture the manipulation movements. The dynamic parameters and the sEMG signals of the upper limb muscles were collected by the pressure-sensitive gloves and the wireless sEMG acquisition system, and the data were processed and analyzed. Results: The upper arm muscle was the main force muscle of CCMT, and biceps brachii had the highest contribution rate. The range of motion, speed, pulling force, and time of the cervical spine positioning and directional rotation pulling technique were all greater than the another. In the cervical spine positioning and directional rotation pulling technique, the combined velocity of the elbow joint was 67.48±31.21mm/s, and the maximum angular velocity of the three axes was 36.07±11.39°/s on X-axis, 36.88±14.30°/s on Y-axis, and 6.31±3.54°/s on Z-axis respectively; The peak load was 9.25±3.91kg, and the pulling time was 200±86ms; The peak load was 2.36±1.05kg, and the pulling time was 225±103ms; The contribution rate of right biceps brachii was the highest at 22.82%. In the cervical spine lateral flexion technique, the combined velocity of the elbow joint was 10.63±3.51mm/s, and the maximum angular velocity of the three axes was 14.15±7.57°/s on X-axis, 32.90±11.67°/s on Y-axis, and 15.81±7.18°/s on Z-axis respectively; The peak load was 1.72±0.60kg, and the pulling time was 84±69ms; The peak load was 1.32±0.69kg, and the pulling time was 84±56ms; The contribution rate of right biceps brachii was the highest at 12.83%. The EMG and RMS of each muscle of the operator in the former technique were higher than those in the latter one. Conclusion: The overall movement range, three-dimensional movement angle, load intensity and time at the moment of the CCTM have the characteristics of "high speed, low amplitude, and strong force", reflecting the biomechanical characteristics of "Cunjin" in traditional Chinese medicine, to provide a reference for further standardizing manual teaching and training and improving clinical safety.

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History
  • Received:May 03,2022
  • Revised:August 02,2022
  • Adopted:August 04,2022
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