Quantitative Assessment of Motor Function for Patients with a Stroke by an End-Effector Upper Limb Rehabilitation Robot

Table 4

Parameters of the range of the movement during circle drawing movement.

Parameters	Healthy subjects ()	Stroke patients ()
(°)
(°)

M: mean value; STD: standard deviation. was the ratio of the short semi-axis and long semi-axis of the fitted ellipse of real trajectory, which represented the degree of the ellipse close to a circle. If was closer to 1, the real trajectory would be closer to a circle. in stroke patients was a little smaller than that in healthy subjects (, ). between stroke patients and healthy subjects was different from each other (, ), and in stroke patients was larger than that in healthy subjects, which represented that patients’ movement trajectory deviated more from a circle than healthy subjects. was the ratio of the real trajectory area and the target circle area, which represented the ratio of the real movement range to the ideal movement range. If was closer to 1, the real movement range would be closer to the ideal range. in stroke patients was larger than that in healthy subjects (, ), and in stroke patients was much larger than that in healthy subjects (, ). and represented, respectively, the inclination angle of the long semi-axis and the rotation angle of the fitted ellipse’ center, which described the participants’ preferred movement direction. (92.39°) in stroke patients was a little larger than that in healthy subjects (90.42°) (, ). in stroke patients (55.73°) was much smaller than that in healthy subjects (69.71°) (, ). Both of and demonstrated that patients preferred to move in a direction that closer to the coronal axis which was parallel to the x coordinate axis shown in Figure 4.