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Figure 1 | Journal of NeuroEngineering and Rehabilitation

Figure 1

From: Effects of Carpal Tunnel Syndrome on adaptation of multi-digit forces to object mass distribution for whole-hand manipulation

Figure 1

Experimental setup and experimental variables. Panel A shows the front and side views of the grip device used for the experiments and its dimensions (in cm). Force/torque sensors are mounted on both sides of the device to measure forces and moment of forces exerted by each digit (thumb, index, middle, ring, and little fingers: T, I, M, R, and L, respectively). A mass (200 g) was inserted in one of three compartments at the bottom of the grip device to change the object center of mass towards the thumb, in the center, or the finger side of the device (TCM, CCM, FCM, respectively). Panel B shows, from top to bottom, the time course of the object vertical position, object roll, compensatory moment (Mcom), individual digit normal and tangential forces (Fn and Ftan, respectively), and the vertical distance between center of pressure of T and the other four fingers (ΔCoP). Experimental variables are aligned with object lift onset (‘a’, vertical line). Note that analysis of digit forces during object hold (‘b’) was performed on data averaged over the last 2 seconds of the hold. Data are from one representative CTS patient (S8) and her matched control (left and right column, respectively) performing the task on the fifth trial in the TCM condition.

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