Force steadiness as a predictor of time to complete a pegboard test of dexterity in young men and women.
The purpose of the study was to evaluate the capacity of an expanded set of force steadiness tasks to explain the variance in the time it takes young men and women to complete the grooved pegboard test. In a single experimental session, 30 participants (mean ± SD) (24.2 ± 4.0 yr; 15 women) performed the grooved pegboard test, two tests of hand speed, measurements of muscle strength, and a set of submaximal, steady contractions. The steadiness tasks involved single and double actions requiring isometric contractions in the directions of wrist extension, a pinch between the index finger and thumb, and index finger abduction. Time to complete the grooved pegboard test ranged from 41.5 to 67.5 s. The pegboard times (53.9 ± 6.2 s) were not correlated with any of the strength measurements or the reaction time test of hand speed. A stepwise, multiple-regression analysis indicated that much of the variance (R(2) = 0.70) in pegboard times could be explained by a model that comprised two predictor variables derived from the steadiness tasks: time to match the target during a rapid force-matching task and force steadiness (coefficient of variation for force) during a single-action task. Moreover, the pegboard times were significantly faster for women (51.7 ± 6.8 s) than men (56.1 ± 4.9 s). Participants with slower pegboard times seemed to place a greater emphasis on accuracy than speed as they had longer times to match the target during the rapid force-matching task and exhibited superior force steadiness during the single-action task.
Department of Integrative Physiology, University of Colorado, Boulder, Colorado; and College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia awad.almuklass@colorado.edu.
Awad M
AM
Almuklass
Department of Integrative Physiology, University of Colorado, Boulder, Colorado; and.
Ryan C
RC
Price
Department of Integrative Physiology, University of Colorado, Boulder, Colorado; and.
Jeffrey R
JR
Gould
Department of Integrative Physiology, University of Colorado, Boulder, Colorado; and.
Roger M
RM
Enoka
D000328:Adult; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D055595:Mechanical Phenomena; D009046:Motor Neurons / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D055815:Young Adult
grooved pegboard; hand function; muscle strength; reaction time; sex differences