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Typing keystroke duration changed after submaximal isometric finger exercises.

Authors
Joe-Chang-CH; Johnson-PW; Katz-JN; Eisen-EA; Dennerlein-JT
Source
Eur J Appl Physiol 2009 Jan; 105(1):93-101
NIOSHTIC No.
20034992
Abstract
A repeated-measures laboratory experiment tested whether keystroke duration during touch-typing changes after a finger performs submaximal isometric flexion exercises. Fourteen right-handed touch-typists used right ring finger to perform three 15-min exercise conditions, two isometric exercises and a no-force condition, each on a separate day. Before and after each exercise condition, typing keystroke duration and isometric force elicited by electrical stimulation were measured for right ring finger. Keystroke duration of right ring finger decreased by 5% (6 ms, P < 0.05) immediately after the exercises but not after the no-force condition. Peak isometric finger force elicited by electrical stimulation decreased by 17-26% (P < 0.05) for the flexor digitorum superficialis and decreased by 4-8% for the extensor digitorum communis after the isometric exercises. After the finger was exposed to isometric exercises, changes in typing keystroke duration coincided with changes in the physiological state of the finger flexor and extensor muscles.
Keywords
Biomechanics; Posture; Muscles; Occupational-exposure; Humans; Ergonomics; Physiological-factors; Musculoskeletal-system; Computer-equipment; Statistical-analysis; Author Keywords: Computer use; Muscle physiology; Fatigue; Musculoskeletal disorders; Exposure assessment
Contact
Department of Environmental Health, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA, 02115
CODEN
EJAPFN
Publication Date
20090101
Document Type
Journal Article
Email Address
chjchang@gmail.com
Funding Amount
121350
Funding Type
Grant
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003997
Issue of Publication
1
ISSN
1439-6319
Source Name
European Journal of Applied Physiology
State
MA
Performing Organization
Harvard University, Boston, Massachusetts
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