MS, University of Cincinnati, 2016, Medicine: Industrial Hygiene (Environmental Health)
Globally, low back pain is considered to be one of the most prevalent health problems in many physically demanding industries. Many of these industries have areas with restricted or confined spaces where manual material handling occurs. To further complicate the lifting situation, these confined spaces often have poor lighting. The objective of the study was to evaluate the spine loading when lifting boxes under a confined space with different light levels. Ten participants (5 females and 5 males) completed the laboratory study where the study design included two levels of confined space (high and low), three light levels (low, medium, and high), two pallet layers (top and bottom), and five pallet positions (left front, left back, middle, right front, right back). The dependent variables included three-dimension spine loads (compression, lateral shear, and anterior-posterior shear), three-dimensional trunk kinematics (position and velocity), trunk muscle activity (ten trunk muscles), and rating of perceived exertion. The light level had limited impact with an increase only for lateral shear (about 80 N to 100 N) at higher light levels. Confined space had a much larger impact on the spine loads with a 1200 N increase in compression and a 160 N increase for A-P shear force when lifting under the low confined space as compared to the high confined space. Light level (low and medium) produced elevated anterior-posterior shear force when lifting under the low confined space condition. As expected, location on the pallet influenced the spine loads with layer having the largest impact (more than 580 N in compression, 100 N in lateral shear, and 125 N in A-P shear). Position on the pallet had minimal impact on the spine loads, likely due to the ability to move around the pallet. Subjective ratings provided similar insight where the low confined space had significantly more perceived exertion than the high condition. Gender did modify several of these relationships. The stud (open full item for complete abstract)
Committee: Kermit Davis Ph.D. (Committee Chair); Susan Kotowski Ph.D. (Committee Member)
Subjects: Occupational Safety