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Prolonged exposure to seated whole-body vibration (WBV) is considered a risk factor for neck pain (NP) and low back pain (LBP) in aircrew. Decreased trunk proprioception following WBV exposure has been previously reported. Proprioceptive feedback from the mechanoreceptors of the neck and trunk regions plays an important role in maintaining proper postural stability; therefore, it was hypothesized that WBV exposure would negatively affect both cervical/trunk proprioception and postural stability, potentially exposing aircrew to a greater risk of NP/LBP. The purpose of this study was to examine the effects of WBV on cervical and trunk proprioception and postural stability. Methods: A total of 15 healthy subjects (6 males and 9 females) participated (age: 25.4 ± 4.5 years, height: 169.0 ± 7.8 cm, weight: 69.9 ± 10.9 kg). On three separate visits, subjects performed one of three testing protocols before and after seated WBV exposure for 30 minutes: 1. Cervical spine rotation joint position sense (JPS); 2. Trunk flexion JPS and trunk flexion/extension threshold to detect passive motion (TTDPM); and 3. Single leg eyes-open/closed static postural stability and dynamic postural stability. Cervical/trunk JPS was calculated as an absolute difference between the reference and replicated trials. Trunk TTDPM was calculated as time to perceive a passive movement and direction. The standard deviation of the ground reaction forces in anterior-posterior, medial-lateral, and vertical directions during a 10-second static balance was used for static postural stability. The first three seconds of the ground reaction forces during a forward jump-landing task were used to calculate dynamic postural stability index. Paired t-tests or Wilcoxon Signed Ranks tests were used to examine the difference before and after the seated WBV exposure across all variables. A Bonferroni correction was applied to the accepted p-value (p < 0.01). Results: No significant changes were observed in cervical spine JPS, trunk JPS/TTDPM, or static/dynamic postural stability variables. Discussion: Based on the current findings, the seated WBV exposure does not seem to influence proprioception and static/ dynamic postural stability. Future studies should consider the occupational vibration, which has cumulative effects and other combined factors such as posture and muscular fatigue.

Effects of Seated Whole-Body Vibration Exposure on Cervical and Trunk Proprioception and Static and Dynamic Postural Stability