Joint Motion Analysis of the Upper Extremity Required for Eating Activities

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The purpose of this study was to determine differences in the range of upper extremity motion, the shoulder, elbow, forearm, and wrist joints, required for eating, between the utensils used, and three positions of the food vessel using an electromagnetic tracking instrument. The time required for the motion was also measured. Twelve subjects were studied as they performed eating tasks using either chopsticks or a spoon from a vessel placed at one of three distance positions. It was found that the ranges of motion required for eating with chopsticks were 19.5° to 56.8° , shoulder flexion, 10.3° to 25.6° shoulder abduction, 50.2° to 120.5° elbow flexion, -1.2° to 59.6° forearm supination, 13.3° to 28.8° wrist extension, and -3.8° to 11.3° wrist ulnar deviation. On the other, hand,,..the ranges of motion required for eating with a spoon were 24.9° to 64.5° shoulder flexion, 14.4° to 29.2° shoulder abduction, 46.3° to 11.8.3° elbow flexion, -4.2° to 51.6° forearm supination, 18.1° to 29.0° wrist extension, and -0.4° to 17.1° wrist ulnar deviation. When chopsticks were used, the position of the vessel influenced the differences in shoulder flexion as well as the minimal elbow flexion. When a spoon was used, there were differences in shoulder flexion, maximal shoulder abduction, and minimal elbow flexion. Differences between chopsticks and spoons were observed in the maximum value of shoulder abduction when the vessel was placed at proximal, middle, and distal positions. Unfortunately, rotation of the shoulder could not be calculated ; one reason being the difficulty in calculating the rotation angle of the upper arm within a series of body angles, because the position of 0° of rotation could not be well defined when the shoulder joint produced a combined motion of flexion and abduction (known as Codman's paradox).
神戸大学の論文
2004-03-25

Joint Motion Analysis of the Upper Extremity Required for Eating Activities

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