The effect of eating utensil weight on functional arm movement in people with Parkinson's disease: a controlled clinical trial.

Objective: To investigate the effect of eating utensil weight on kinematic performance in people with Parkinson's disease.

Design: A counterbalanced repeated-measures design.

Setting: A motor control laboratory in a university setting.

Subjects: Eighteen adults with Parkinson's disease and 18 age-matched controls. EXPERIMENTAL CONDITIONS: Each participant performed a food transfer task using spoons of three different weights: lightweight (35 g), control (85 g) and weighted (135 g). Kinematic variables of arm movement were derived and compared between conditions.

Main Measures: Kinematic variables of arm movement, including movement time, peak velocity and number of movement units.

Results: Utensil weights significantly affected the movement kinematicsof all participants. Both groups had fewer movement units in the lightweight condition (Parkinson's disease group: 22.18, controls: 19.89) than in the weighted condition (Parkinson's disease group: 22.68, controls: 21.36), suggesting smoother movement in the former condition. In addition, both groups had higher peak velocity in the lightweight than in the weighted condition.

Conclusions: Our findings suggest that a lightweight utensil may facilitate smoother and higher-velocity arm movement than a weighted one in people with Parkinson's disease.