David Rempel

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Abstract Observer, manual single-frame video, and automated computer vision measures of the Hand Activity Level (HAL) were compared. HAL can be measured three ways: (1) observer rating (HALO), (2) calculated from single-frame multimedia video task analysis for measuring frequency (F) and duty cycle (D) (HALF), or (3) from automated computer vision (HALC). This study analysed videos collected from three prospective cohort studies to ascertain HALO, HALF, and HALC for 419 industrial videos.

3.1. Humerothoracic and glenohumeral rotations for hand locations For the 77 hand locations, at or above the shoulder, that were within the reach range of the 50th % female (0.20–0.55 m), the mean humerothoracic rotation was 73.7 ± 28.6° (minimum = 16.5°, maximum = 136.4°) and the mean glenohumeral rotation was 50.0 ± 19.9° (minimum = 10.9°, maximum = 94.4°) ).