Effects of whole body vibration on strength and functional mobility in multiple sclerosis

The aim of this study was to examine the effectiveness of regular whole body vibration (WBV) training on lower limb muscle strength and functional mobility in individuals with multiple sclerosis. A single subject experimental design was replicated on three subjects. Phases included a 4-week baseline phase without intervention, 6 weeks of twice weekly WBV intervention on a VibroGym apparatus, and a 4-week baseline phase without intervention. During all phases, strength of the ankle plantarflexors and knee extensors was assessed twice weekly with the Nicholas Manual Muscle tester and functional mobility with the Timed Up and Go test. All subjects improved significantly in plantarflexor strength (p<0.05). One subject improved significantly in knee extensor strength bilaterally and one subject in the weaker leg. Two subjects improved significantly in functional mobility. These improvements in strength and mobility were maintained in the final baseline phase. In conclusion, regular WBV training can improve lower limb strength and mobility in some individuals with multiple sclerosis. Individuals who do not perform any other exercise, are in a moderate stage of disease progression, and have a more intensive exercise protocol in conjunction with WBV seem to benefit most. However, further high-quality studies are needed.