Cardiorespiratory Response to Exercise in Parkinson's Disease: Associations with Autonomic Dysfunction and Physical...

Area of Science:

• Neurology
• Cardiology
• Exercise Physiology

Background:

• Cardiorespiratory fitness in Parkinson's disease (PD) may be impacted by autonomic dysfunction and low physical activity levels.
• The interplay between autonomic function, physical activity, and cardiorespiratory fitness in PD requires further investigation.

Purpose of the Study:

• To explore the relationship between autonomic dysfunction, daily physical activity, and cardiorespiratory fitness parameters in individuals with PD.

Main Methods:

• A cohort of 59 individuals with PD underwent cardiopulmonary exercise testing (CPET).
• Autonomic dysfunction was assessed using the Scales for Outcomes in Parkinson's disease-Autonomic dysfunction (SCOPA-AUT).
• Daily physical activity was measured via smartphone step counts over 4 weeks, with analyses adjusted for age, sex, and beta-blocker use.

Main Results:

• Increased SCOPA-AUT scores were linked to reduced maximum heart rate (HRmax).
• Higher daily step counts correlated with improved heart rate recovery (HRrec3) and higher peak oxygen consumption (VO2peak).
• No significant association was found between SCOPA-AUT or step counts and HRrec1.

Conclusions:

• Both autonomic dysfunction and physical activity levels are independently associated with cardiorespiratory responses during exercise in PD.
• These factors appear to influence distinct parameters of exercise response, suggesting targeted interventions may be beneficial.
• Further research is needed to validate these findings and explore their potential as clinical trial endpoints.