Introduction: Parkinson's disease causes movement disorders and is the second most common degenerative disease of the central nervous system. It usually occurs in older adults and includes motor and non-motor symptoms. In most cases, the cause of the disease is unknown. The greatest risk factor is age, as the risk of Parkinson's disease increases with age. Water has long been considered a healing agent and is often used to manage various health problems. Aquatic therapy is any type of exercise performed in a water enviroment. The physical properties of water contribute to less stress on joints, a lower risk on injury or falls. Balance is the ability to maintain an upright posture or control body movements, which requires good coordination and adequate level of other components of physical fitness. Impaired postural control, which is characteristic of Parkinson's disease, significantly affects the ability to maintain balance. Purpose: The purpose of the thesis was to review scientific and professional literature to determine the impact of aquatic therapy on improving balance in people with Parkinson's disease. Methods: The literature was searched in the PubMed database. The following combinations of keywords in English were used: »aquatic therapy AND Parkinson's disease AND balance«, »hydrotherapy AND Parkinson's disease AND balance«. Results: Based on the inclusion and exclusion criteria, we included five studies published after 2014 in the literature review. Therapeutic programs lasted from minimum five weeks to a maximum of ten weeks, and individual therapies lasted from minimum of 30 minutes to a maximum of 60 minutes. The implementation of therapeutic programs proved to be effective in improving balance, as in four studies there was a statistically significant improvement in the experimental group compared to the control group. Discussion and conclusion: We found that aquatic therapy has a significant impact on improving balance in patients with Parkinson's disease. It also contributes to reducing fall risk, enhancing postural control, increasing muscle strength and improving gait performance. Further research would be needed in which it would be reasonable to standardize therapeutic aquatic exercise programs, which would allow for more accurate comparison of results.
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