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<p>A high prevalence of low back disorders was observed among occupational drivers. A lot of investigations have shown associations between whole-body vibration and low back pain. However, few studies revealed the in vivo dynamic characteristics of the lumbar spine in both of the fore-and-aft and vertical directions. In this study, a whole-body finite element model was used to obtain the biomechanical responses of the spine at a whole-body level. The results showed the first six resonance frequencies of the human body were 0.6, 0.8, 1.2, 3.2, 4.1 and 5.3&#xa0;Hz, respectively, while the pitching and vertical resonance frequencies were 3.2 and 5.3&#xa0;Hz. The morphologies of vibration modes showed that the upper lumbar region exhibited large deformation for the pitching vibration mode, while the lower lumbar region exhibited the larger deformation for the vertical vibration mode. The dynamic analyses showed that fore-and-aft vibrations would also cause forces on lumbar spine in the vertical direction. In normal vibration conditions, the stress would concentrate in the posterior region of lumbar spine, while it would be reversed in the braking condition.</p>

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Vibration Characteristic Analysis of Lumbar Spine in Human Body: for Pitching and Vertical Directions

  • 期刊论文

  • 发表日期：

    2025年4月18日

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  • Li-Xin Guo,
  • Chi Zhang

摘要

A high prevalence of low back disorders was observed among occupational drivers. A lot of investigations have shown associations between whole-body vibration and low back pain. However, few studies revealed the in vivo dynamic characteristics of the lumbar spine in both of the fore-and-aft and vertical directions. In this study, a whole-body finite element model was used to obtain the biomechanical responses of the spine at a whole-body level. The results showed the first six resonance frequencies of the human body were 0.6, 0.8, 1.2, 3.2, 4.1 and 5.3 Hz, respectively, while the pitching and vertical resonance frequencies were 3.2 and 5.3 Hz. The morphologies of vibration modes showed that the upper lumbar region exhibited large deformation for the pitching vibration mode, while the lower lumbar region exhibited the larger deformation for the vertical vibration mode. The dynamic analyses showed that fore-and-aft vibrations would also cause forces on lumbar spine in the vertical direction. In normal vibration conditions, the stress would concentrate in the posterior region of lumbar spine, while it would be reversed in the braking condition.