An objective measure combining physical and cognitive fatigability: Correlation with subjective fatigue in Parkinson's disease

PD-related fatigue is associated with performance on an externally cued, attention-controlled motor task, but not with an uncued version of the same task. The finding supports a link between PD-related fatigue and attention-demanding motor tasks, proposing a model of inducible fatigue applicable to future clinical and neuroimaging research.