Dynamic postures of the transverse metacarpal arch during typing.
Baker-NA; Xiu-K; Moehling-K; Li-ZM
J Appl Biomech 2013 Dec; 29(6):810-816
The purpose of this paper is to describe the transverse metacarpal arch (TMA) during a dynamic typing task. Static/relaxed and dynamic typing TMA were collected from 36 right-handed females with musculoskeletal discomfort using a motion capture system. While the angle of right TMA static/relaxed posture (10.1 degrees +/- 5.5 degrees) was significantly larger than the left (8.5 degrees +/- 5.6 degrees) (P < .05), the right dynamic posture (10.6 degrees +/- 4.3 degrees) was not significantly different from the left (10.3 degrees +/- 5.5 degrees) (P = .66). Within both these mean scores, there was considerable individual variation, with some subjects demonstrating very flat TMA, and some very curved. The results indicate that TMA angular postures both for static/relaxed and dynamic typing are highly variable both between individuals and between individual hands.
Humans; Adolescents; Women; Extremities; Hand-injuries; Musculoskeletal-system; Musculoskeletal-system-disorders; Posture; Age-groups; Physiology; Physiological-factors; Physiological-function; Physiological-measurements; Physiopathology;
Author Keywords: kinematics; occupational therapy; hand; transverse metacarpal arch
Nancy A. Baker, Department of Occupational Therapy, 5012 Forbes Tower, University of Pittsburgh, Pittsburgh, PA, 15260
Journal of Applied Biomechanics
University of Pittsburgh at Pittsburgh