Assessment of Grip and Pinch Strength

These measures were used to obtain an assessment of motor function. As the production of a drawing with an implement on a surface must compensate for frictional forces on the surface, both grip and pinch strength can be viewed as functional measures related to both gross and fine motor control. The full procedure for assessing grip and pinch strength can be found in Kirkorian et al. (2020) (link). Briefly, a Preston Jamar hand dynamometer and pinch meter (Patterson Medical, Warrenville, IL) were used for these assessments. For grip strength, the smallest handle position was used for all participants. Participants were asked to attempt three assessments for each hand, alternating between both hands. The maximum grip and pinch measurements across all trials were used in the analyses, as recommended by Roberts et al. (2011) (link).