Acute effect of whole body-vibration exercise and osteopathic manipulative treatment on the heart rate variability in individuals with metabolic syndrome: Randomized cross-study protocol.

Metabolic syndrome (MSy) is a risk factor for cardiovascular disease. The decrease in vagal activity has been related to the mechanism of MSy development. Recently, it has been proposed that the WBV exercise, as well as osteopathic manipulative treatment (OMT) stimulate cardiac autonomic modulation. The aim of this study is to evaluate the acute effects of whole body-vibration (WBV) exercise and OMT on heart rate variability (HRV) in individuals with MSy. Cross-sectional, randomized, cross-over study (one-week wash-out between interventions) and blinding analysis. Individuals with MSy will be randomized into 5 groups: 1) whole body-vibration exercise group (WBVG), 2) osteopathic manipulative treatment group (OMTG), 3) WBVG + OMTG, 4) OMTG + WBVG, 5) control group (CG). OMT will consist of suboccipital decompression technique, myofascial relaxation on cervical and diaphragm muscles. The HRV measurement will be done with the individual at rest, during the 2-min step test (2MST) and during interventions. After the treatment, the measurements will be repeated. The modulation of ANS is important in the management of MSy individuals. The investigation of intervention modalities to improve this modulation is necessary and it is expected that this protocol can promote this modulation and improve the HRV. [ABSTRACT FROM AUTHOR]