title: Dynamic postures of the transverse metacarpal arch during typing.
abstract: 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° ± 5.5°) was significantly larger than the left (8.5° ± 5.6°) (P < .05), the right dynamic posture (10.6° ± 4.3°) was not significantly different from the left (10.3° ± 5.5°) (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.
authors.affiliation: Department of Occupational Therapy, University of Pittsburgh, Pittsburgh, PA.
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Baker
authors.forename: Kaihua
authors.initials: K
authors.lastname: Xiu
authors.forename: Krissy
authors.initials: K
authors.lastname: Moehling
authors.forename: Zong-Ming
authors.initials: ZM
authors.lastname: Li
mesh_terms: D000293:Adolescent; D000328:Adult; D012090:Cumulative Trauma Disorders / Q000503:physiopathology*; D005260:Female; D018737:Hand Strength; D006801:Humans; D008663:Metacarpus / Q000503:physiopathology*; D008875:Middle Aged; D009068:Movement; D004856:Postural Balance; D011187:Posture / Q000502:physiology; D015443:Word Processing; D055815:Young Adult