Motor dysfunction in late life depression: A mood or movement disorder?

Area of Science:

• Geriatric Psychiatry
• Movement Disorders
• Neuroscience

Background:

• Motor dysfunction is prevalent in late-life depression (LLD) but remains poorly understood.
• This study aimed to characterize motor deficits in LLD and their relationship with clinical factors.

Purpose of the Study:

• To comprehensively assess motor dysfunction in LLD patients using a multimodal approach.
• To investigate the association of motor deficits with depressive symptoms, cognitive function, and fall history.
• To explore the impact of psychotropic medications on motor performance in LLD.

Main Methods:

• 75 participants (34 LLD patients, 41 controls, ≥60 years) underwent comprehensive assessments.
• Evaluated motor function via scales (MDS-UPDRS, SARA), speech, gait analysis, and a digital tablet drawing task.
• Used regression and mixed-effects models to analyze motor outcomes, clinical scores, and fall history.

Main Results:

• LLD patients exhibited significant motor dysfunction compared to controls across all assessments.
• Motor deficits were not significantly associated with depression severity, apathy, or cognitive impairment.
• Slower movement execution was observed in LLD patients, but initiation improved with cueing.
• Ataxia (SARA) and gait abnormalities correlated with fall incidence.

Conclusions:

• Motor dysfunction in LLD is not strongly linked to core depressive symptoms or cognitive deficits.
• Cueing strategies show potential for improving movement initiation in individuals with LLD.
• Motor deficits, particularly ataxia and gait issues, are associated with falls in LLD patients.