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Shopping bag tremor: insights from kinematic analysis
Daniele Birreci1, Simone Aloisio1,2, Anna S Grandolfo1
1Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy.
Background:
Shopping bag tremor (SBT) is a rare activation-specific tremor characterized by weight-dependent oscillations, with uncertain nosological classification.
Case Report:
We report a 74-year-old woman with a right upper limb tremor triggered by carrying a shopping bag, with mild rest component. Kinematic analysis demonstrated a non-linear load-response relationship, with low tremor amplitude when unloaded, maximal at low loads (1 kg), and progressively decreasing as weight increased. No abnormalities were detected on finger tapping analysis.
Discussion:
This case expands the phenotypic spectrum of SBT and supports quantitative kinematic analysis as a feasible first-line tool within diagnostic algorithms for complex tremor presentations.
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