The present study will characterize exercise model effects (integrated model vs. consecutive model) of physical-cognitive exercise on dual-task walking control in Parkinson's disease with mild cognitive impairment.

Inclusion Criteria:

• a diagnosis of idiopathic Parkinson's disease
• have decreased cognitive functions but do not interfere with functional independence
• Montreal Cognitive Assessment (MoCA): 21-25
• able to walk independently without walking devices for at least 10 meters and with the ability to turn 180°

Exclusion Criteria:

• a diagnosis of dementia
• other diseases that may influence cognitive functions or walking performance
• a history of brain surgery
• modification of the medication during the exercise intervention