All vibration machines produce vibration in 3 different directions, the most safe and effective platforms produce sufficient vertical vibration while limiting horizontal vibration. Research has shown that significant vertical amplitude is required to generate adequate loading of the muscular and skeletal systems. This can be achieved with one motor whole body vibration machines as well as dual motor types.
A dual motor machine can produce a significant amount of force causing the vibrations to feel very intense. If the machine has a large workout platform and is being used to primarily increase athletic performance this is a good thing. However, dual motors with a smaller platform may cause too much neurologic integration causing sensory overload. Whole Body Vibration stimulates every muscle, ligament, and tendon providing feedback to the brain. Vibrations that are too strong can be very uncomfortable and can actually harm someone that is using the machine to treat a condition. It’s almost impossible to get 2 motors to work at the exact same frequency at the same time. Therefore it is not really delivering a consistent stimulus to do the right brain mapping for neurologic integration.
A single motor machine is capable of producing adequate force for a more comfortable vibration. These types of machines are great for 98% of the general public that tend to be de-conditioned. They produce a desired amount of amplitude that is beneficial to the human body and not too intense. Single motor machines provide a consistent stimulus for neurologic integration. A single motor device therefore will balance the body and brain, helping to put your body into a whole brain functioning state. High amplitudes are not typically achieved using a single motor system but the beneficial effect is still obtained. High amplitude is really not the most important mechanical objective in Whole Body Vibration.
If you plan on using a machine for home use or rehabilitation, a one motor unit is best. Only stand on a dual motor system if being supervised by a personal trainer or other WBV expert. A more intense muscle contraction can be achieved using a dual motor system but guidance is necessary.
Most people believe that more is better, but when it comes to Whole Body Vibration this is not the case.

great post thanks!, love to see more posts from you.