Abstract
Background: Gait impairment is common in Parkinson's disease (PD) and may result in greater energy expenditure, poorer walking economy, and fatigue during activities of daily living. Auditory cueing is an effective technique to improve gait; but the effects on energy expenditure are unknown. Objective: To determine whether energy expenditure differs in individuals with PD compared with healthy controls and if auditory cueing improves walking economy in PD. Methods: Twenty participants (10 PD and 10 controls) came to the laboratory for three sessions. Participants performed two, 6-minute bouts of treadmill walking at two speeds (1.12 m·sec−1 and 0.67 m·sec−1). One session used cueing and the other without cueing. A metabolic cart measured energy expenditure and walking economy was calculated (energy expenditure/power). Results: PD had worse walking economy and higher energy expenditure than control participants during cued and non-cued walking at the 0.67 m·sec−1 speed and during non-cued walking at the 1.12 m·sec−1. With auditory cueing, energy expenditure and walking economy worsened in both participant groups. Conclusions: People with PD use more energy and have worse walking economy than adults without PD. Walking economy declines further with auditory cuing in persons with PD.