Step-rate threshold for physical activity intensity in Parkinson's disease.

Area of Science:

• Kinesiology
• Neurology
• Biomedical Engineering

Background:

• Parkinson's disease (PD) affects motor control, impacting physical activity.
• Accurate assessment of physical activity intensity is crucial for managing PD.
• Current physical activity guidelines may not be directly applicable to individuals with PD.

Purpose of the Study:

• To investigate the relationship between step rate and energy expenditure during treadmill walking in people with PD.
• To establish a specific step-rate threshold for moderate-to-vigorous physical activity (MVPA) in individuals with PD.

Main Methods:

• Thirty individuals with mild-to-moderate PD and 30 age- and sex-matched controls participated.
• Participants completed treadmill walking at self-selected comfortable, slower, and faster speeds.
• Energy expenditure was measured using indirect spirometry, and step rate was recorded.

Main Results:

• A strong association between step rate and energy expenditure was observed in both groups (R² = .92).
• Individuals with PD exhibited a steeper slope, indicating a lower step-rate threshold for MVPA (~80 steps/min) compared to controls (~93 steps/min).

Conclusions:

• The findings support a disease-specific step-rate threshold for MVPA in individuals with PD.
• This threshold has significant implications for promoting, prescribing, and monitoring physical activity in PD management.
• Utilizing accelerometers and pedometers with this new threshold can aid in managing PD health and symptoms.