A hand speed - duty cycle equation for estimating the ACGIH hand activity level rating.
Akkas-O; Azari-DP; Chen-C-H; Hu-YH; Ulin-SS; Armstrong-TJ; Rempel-D; Radwin-RG
Ergonomics 2015 Feb; 58(2):184-194
An equation was developed for estimating hand activity level (HAL) directly from tracked root mean square (RMS) hand speed (S) and duty cycle (D). Table lookup, equation or marker-less video tracking can estimate HAL from motion/exertion frequency (F) and D. Since automatically estimating F is sometimes complex, HAL may be more readily assessed using S. Hands from 33 videos originally used for the HAL rating were tracked to estimate S, scaled relative to hand breadth (HB), and single-frame analysis was used to measure D. Since HBs were unknown, a Monte Carlo method was employed for iteratively estimating the regression coefficients from US Army anthropometry survey data. The equation: [Formula: see text], R2 = 0.97, had a residual range +/- 0.5 HAL. The S equation superiorly fits the Latko et al. ( 1997 ) data and predicted independently observed HAL values (Harris 2011) better (MSE = 0.16) than the F equation (MSE = 1.28).
Hand-protection; Musculoskeletal-system; Musculoskeletal-system-disorders; Extremities; Force; Exposure-levels; Risk-factors; Repetitive-work; Physiological-effects; Physiology; Carpal-tunnel-syndrome; Exposure-assessment; Analytical-processes;
Author Keywords: exposure assessment; repetitive motion; work-related musculoskeletal disorders
Robert G. Radwin, Department of Industrial and Systems Engineering, University of Wisconsin-Madison, 1550 Engineering Drive, Madison, 53706-1608
Grant-Number-R21-OH-010221; Grant-Number-R01-OH-007914; M102014
University of Wisconsin-Madison