Introduction
Parkinson's disease (PD) is a complex neurodegenerative disorder characterised by disabling motor and non-motor signs. Current medical therapies can partially alleviate these symptoms, but are also accompanied by dose-limiting side effects. Moreover, their therapeutic window narrows with disease progression, leaving the patient with increasing disability. Complementary non-pharmacological approaches, such as aerobic exercise, have been evaluated for over two decades. The heterogeneity of the interventions and outcomes used hinders the interpretation of the effect of exercise in PD.1 Several systematic reviews and meta-analyses have pooled the results, but their conclusions depend greatly on the diversity of the included exercise modalities. Nevertheless, a beneficial effect of exercise on motor symptoms of PD as well as a general health benefit (physical fitness) seems likely from these studies. A beneficial effect on non-motor symptoms in PD is also conceivable, but not yet proven.2 To strengthen the evidence on symptomatic benefits,...
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