Introduction: Parkinson's disease (PD) is responsible for several changes in the body, such as balance, gastrointestinal and autonomic disorders and are associated with impairments in the clinical prognosis of these individuals. In this sense, therapies capable of minimizing this impact are extremely important. Osteopathy has become an alternative treatment for individuals with neurological disorders and has been shown to be effective in treating various conditions, including PD. Objective: a) to evaluate the acute effect of visceral manipulation directed to the intestines and visceral plexuses in the autonomic nervous system of PD patients; b) identify the effect of this approach, after four visits, on balance, plantar pressure, gastrointestinal disorders and autonomic nervous system in this population. Materials and Methods: For this randomized clinical trial, 28 adults diagnosed with PD will be recruited. Subjects will be randomized to protocols in two groups: intervention protocol and placebo protocol, where both will consist of 4 visits twice a week. The intervention protocol will consist of osteopathic manipulative techniques and the sham protocol will consist of simulation of therapy, where the therapist will place his hands in the same regions of the intervention protocol, with superficial contact and without therapeutic intention in each region. The outcome measures of the study will consist of Berg balance assessment and plantar pressure, Rome survey on gastrointestinal disorders, and assessment of autonomic modulation by means of heart rate variability analysis. Volunteers and evaluators will be blind to the protocol and not informed of their order. Only the person responsible for the intervention will not be blind to the protocol. Data will be analyzed according to normality (Shapiro-Wilk test), and comparisons of outcomes between the moments (pre and post) will be performed using the T-student test for paired data or Wilcoxon, as normal and for comparisons between protocols. placebo and intervention, Student's T-test for unpaired data or Mann-Whitney test according to normality will be applied. The adopted statistical significance will be fixed at 5%.

Inclusion Criteria:

• Clinical diagnosis of Parkinson's;
• Not having cardiorespiratory diseases;
• Not being a smoker;
• Do not use alcoholic beverages;
• No cognitive deficit;
• No osteoarticular deformities, plantar ulcers, total or partial amputation of the feet;
• They do not need auxiliary devices for walking

Exclusion Criteria:

• Data from individuals with a series of heart rate intervals with less than 95% of sinus beats will be excluded from the study.

The data will be shared for any researcher that requests the data by electronic address

After one year of publication

To receive the data, the researcher must have sent a request to nupi@idot.com.br

Each participant will be randomly assigned to the intervention group or placebo group by an independent study evaluator. Data will be secretly allocated through sealed, opaque envelopes. After the randomization process, the participant will be evaluated by a researcher who will not have knowledge about the distribution of the groups.