Fig. 1 | Scientific Reports

Fig. 1

From: Relationship between adjustability of grasping force and upper limb/hand function in individuals with cerebrovascular disorders

Fig. 1The alternative text for this image may have been generated using AI.

AGF assessment using iWakka. (a) The iWakka device consists of a longitudinally split PVC pipe with a hinge and crossed leaf springs to measure grasping force changes. Strain is recorded and displayed in real time on a tablet. The device was placed on an acrylic board with both elbows on the table and the forearms in the neutral position to eliminate the influence of the upper limbs and keep the height of both shoulders constant. (b) The AGF score was calculated for each section, namely, the isometric (IS1–IS2), concentric (CS1–CS4), and eccentric (ES1–ES4) sections, as the average absolute error between the target and actual grasping force over a 5-second analysis window. For the isometric section in particular, only the initial and final intervals (IS1 and IS2) were used in the analysis to ensure that the data were collected without influence from the preceding or subsequent concentric and eccentric phases. AGF, Adjustability of grasping force; PVC, polyvinyl chloride.

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