Effects of posture on back strength and lifting capacity.
Gallagher S; Bobick TG
Ergonomics and musculoskeletal disorders: research on manual materials handling, 1983-1996. Karwowski W, Wogalter MS, Dempsey PG, eds. Santa Monica, CA: Human Factors and Ergonomics Society, 1997 Sep; :37-41
The Bureau of Mines performed a pilot study examining the effects of posture on back strength and Maximum Acceptable Weight of Lift (MAWL) on six healthy male subjects (M = 32 years + 4 SD). Six back strength measurements (3 static and 3 dynamic) were made while the subjects were kneeling and standing. In addition, these subjects (who were unaccustomed to lifting in these postures) volunteered to participate in a study of psychophysically determined MAWL in both postures. Results of the back strength tests showed a significantly lower peak torque per body weight output in kneeling versus standing back strength measurements for five out of six test comparisons (p < .05). Subjective estimates of lifting capacity in the kneeling posture were significantly lower than those for the stooped posture (p < .05). The results of back strength and lifting capacity in these two postures provide useful information to consider in determining the physiological and psychophysical stresses imposed by these work postures.
Back-injuries; Materials-handling; Posture; Muscles; Miners; Coal-miners; Mining-industry; Low-seam-coal-mines; Manual-lifting; Materials-handling
Karwowski-W; Wogalter-MS; Dempsey-PG
Ergonomics and musculoskeletal disorders: research on manual materials handling, 1983-1996.