Difference between neck muscle vibration and gluteus muscle vibration on standing balance in healthy subjects

The objective was to compare the effects of neck muscle vibrations (NMV) and gluteus medius vibrations (GMV) on posture in healthy subjects.Material and methodsThirty-one healthy subjects (23yr ± 2) were tested, closed eyes, in standing position on force platform with Optitrack 3D capture system. They received successively a 5 min-session of NMV and 5 min-session of GMV in a randomized order. They were evaluated during the vibration, immediately at the end of the vibration and 5 minutes after.ResultsGMV induced a Center of Pressure tilt to the opposite side of the vibration (−7.6 ± 2 mm P < 0.0001). At the end of the vibration, the effect remained significant (−4.97 ± 1.6 mm P = 0.002) and after 5 minutes, the subjects have restored their initial balance (+0.5 ± 2.3, P = 0.97). For NMV, no significant effect was found (P = 0.24). Considering the cinematic parameters, under GMV, a consensual tilt of the different segments of the body in the medio-lateral plane toward the opposite side of the vibration was revealed whereas NMV did induce essentially a head segment tilt toward the vibrated side.DiscussionThese results are in favor of a different mode of action between neck and gluteus medius vibrations.

Source: Neurophysiologie Clinique - December 7, 2019 Category: Neuroscience Source Type: research