R. Baluyut et al., USE OF VISUAL-PERCEPTION IN ESTIMATING STATIC POSTURAL STRESSES - MAGNITUDES AND SOURCES OF ERRORS, Ergonomics, 38(9), 1995, pp. 1841-1850
Very little is known about the magnitudes and sources of errors associ
ated with the visual estimation of postural classification displayed o
n TV screens. This study was conducted to address this issue. Sixty-th
ree subjects participated in the experiments. The findings indicate th
at: (1) subjects found it difficult to evaluate upper extremity postur
es (particularly the elbow and the wrist), while the postures around t
he lower back were the easiest to evaluate; (2) the lower extremity po
sitions affected the ability of the subjects to accurately classify po
stures around the wrist, elbow, shoulder, neck, and lower back, with t
he estimates being > 70% for sitting and > 60% for standing (except fo
r the elbow); and (3) in general, flexion and extension are easier to
evaluate than neutral and non-neutral postures.