The aim of this study is to further evaluate the effects of seasonal variation and the aquatic thermal environment of hyperthermic baths (HTB) on the Motor Symptoms (MS) of Parkinson's Disease (PD), and whether the environmental temperature is associated with these effects.

After being informed about the study and potential risks, all participants will give written informed consent. All participants who meet the inclusion criteria will undergo a complete history and physical examination, including an assessment using the Movement Disorder Society-United Parkinson's Disease Rating Scale (MDS-UPDRS), H&Y stage, MMSE and MOCA. Each participant will receive two subjective measures (the Movement Disorder Society-United Parkinson's Disease Rating Scale part III motor examination total scores and the modified Webster Symptoms Score) nine times in an open medication state (open state). Each participant will take hyperthermic baths (HTB) at the same time on the first, third and fifth days. The participants will receive subjective measures before and after the HTB. The time at which the subjective measures begin after the HTB will be recorded. In the second week, no participants accept any intervention. To avoid the effects of fluctuations in dopaminergic drugs concentrations, subjective measures will be given without HTB at the recorded times on the fifteenth, seventeenth and nineteenth days.

Inclusion Criteria:

• ≥ 18 years of age
• Diagnosis of Idiopathic Parkinson's Disease（IPD）based on the Movement Disorder Society clinical diagnostic criteria for Parkinson's Disease
• Subjective feeling that Motor Symptoms（MS）of Parkinson's Disease （PD） were affected by seasonal variation (i.e., MS were more severe in winter than in summer) and improved after HTB
• No change in the patient's PD medication regimen during the study

Exclusion Criteria:

• Symptomatic bradycardia, severe postural hypotension, symptomatic coronary insufficiency, severe organic heart damage, severe cerebrovascular disease, and active psychosis
• Dementia (Mini-Mental State Examination (MMSE) < 24 and Montreal Cognitive Assessment (MOCA) < 26)
• Failure to cooperate with the study requirements and poor compliance

we'll share our study design and the study results with other researchers

the data will become available 12 months after the study finished for 1 year

clinical doctors