4.3 The effects of whole body vibration in patients with type 2 diabetes: a systematic review and meta-analysis of randomized controlled trials

Journal: Brazilian Journal of Physical Therapy, 2016; 20(1):4-14

Study Context: These researchers sought to carry out a systematic review of the effects of WBV training on the glycemic control, cardiovascular risk factors, and physical and functional capacity of patients with T2DM.

Out of 585 potentially eligible articles, two studies were considered eligible. WBV interventions provided significant reduction of 12 hour fasting blood glucose (A reduction of 25.7 ml/dl). Improvements in glycated hemoglobin, cardiovascular risk factors and physical and functional capacity were found at 12 weeks of WBV training. No adverse effects were reported in any of the studies.

After 12 weeks of upper and lower body exercises performed on the vibrating platform, a significant decrease (p<0.05) was found in cholesterol, triglycerides, atherogenic index, weight, waist circumference, waist to hip ratio and body fat percentages compared to the control group. Improvements (p<0.05) were found in the 6 minute walk test distance and the 30 second sit to stand test. Static balance shoed a decrease in centre of pressure excursion with eyes closed (feet apart and together) The conclusions of this study is that WBV combined with exercise seems to improve glycemic control in patients with T2DM in an exposure dependent way (ie 12 weeks of training required)

Comments: This is a rigorous study that resulted in the exclusion of most the research papers gathered. The two that were chosen both used extremely low intensity WBV exercise of 1-2 total g forces, typically achieved with high frequency and low amplitude training. This type of training is far lower in terms of intensity of many forms of WBV training that provide up to 12 g and even up to 20 g forces during the exercise session.

The improvement in eyes closed balance is an interesting finding that suggests but does not prove that WBV training likely has a role in proprioception as well as strength.