Motion sickness due to vibration on water massage bed

In recent years, water massage bed which can provide full body massage effect is often used in physiotherapy. Compared to other physiotherapy equipment, water massage bed is particularly useful in the fact that it can directly massage the destined area on the subject, thus leads to improvement in relieving muscle strain and provides a psychological relaxation effect. However, motion sickness symptoms such as dizziness or nausea have been reported as side effects after using the bed. In this study, we evaluate the massage effect on the human body by measuring and analyzing the mechanical movements of the body during the massage using an accelerometer and a laser range finder.