Non-Pharmacological Management of Osteoporosis by Mehrsheed Sinaki & Michael Pfeifer

Author:Mehrsheed Sinaki & Michael Pfeifer
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Immediate Effects of WBV on Muscle Activity

Several studies have tried to evaluate the WBV training stimulus from an efficacy perspective and therefore have demonstrated immediate effects on leg muscle activity during vibration stimulation [13, 20–23]. Muscle activation during vibration may be measured by recording the EMG signals of different target muscles. Most of the vibration studies used surface electromyography to measure muscle activity during whole-body vibration. EMG signals can be used to verify if different vibration parameters (amplitude, frequency) result in different muscular responses.

In our laboratory we showed that vertical WBV exposure can induce an increase in muscular activity of numerous muscles, including rectus femoris, vastus medialis, vastus lateralis and gastrocnemius when a frequency of 35 Hz and amplitude of 2.5 mm was applied [23]. Greater muscle activation was found when a one-leg squat (knee angle of 125°) was performed compared with a high squat (125°) and a low squat (90°) (Fig. 10.2).

Fig. 10.2EMG activity of the quadriceps and gastrocnemius muscle in a representative subject while performing a squat with and without vibration (starting after 10 sec); unpublished data

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