Mining Publication: Effects of Posture on Back Strength and Lifting Capacity
Original creation date: September 1997
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.
Book ChapterSeptember - 1997
NIOSHTIC2 Number: 20023255
Ergonomics and Musculoskeletal Disorders: Research on Manual Materials Handling, 1983-1996, W Karwowski; MS Wogalter; PG Dempsey, eds., 1997 Sep; :37-41