Dynamic Versus Static Analyses of Lifting a Box from the Floor

Details

• Personal Author:
  Menzer HM ; Reiser RF II
• Description:
  Lifting objects from below knee height has been implicated as a source of low back pain and injury. Static models have often been used to assess forces produced in the lumbar region by lifting; however, inertial forces generated by acceleration may be significant. Therefore, the goal of this investigation was to assess differences between static and dynamic analysis methods. Sagittal plane kinematics were collected on 21 men and 22 women of college age while lifting a milk crate (men = 25 kg, women = 15 kg) from the floor to standing knuckle height on level as well as sloped (facing uphill and downhill at 10 degrees and 20 degrees) ground conditions. Both static and dynamic top-down inverse models were utilized to assess net muscular moments at L5/S1 as well as the posture of the person at the time of static max (TSM) and dynamic max (TDM) moments. The TDM moment was significantly later than the TSM in the level through uphill conditions (p < 0.001). The dynamic max moment was significantly greater than the static max moment in all conditions (p < 0.001). Torso angles at TSM exhibited a significantly greater forward lean (by < 2 degrees) in the level through uphill conditions (p < 0.001). Overall low-back curvature, hip angles, knee angles, and ankle angles were not affected by the type of model (p > 0.05), though several minor differences occurred at conditions other than the level (most dramatic in the downhill 20 degrees condition). Therefore, if moments are of interest, a dynamic model should be utilized. However, body position is very similar at TSM and TDM. [Description provided by NIOSH]
• Subjects:
  Age Factors Aging Demography Ergonomics Manufacturing And Industrial Facilities Musculoskeletal Diseases Occupational Health Safety Sex Characteristics
• Keywords:
  Age-factors Age-groups Back-injuries Demographic-characteristics Injuries Manual-lifting Manual-materials-handling Materials-handling Models Sex-factors
• ISSN:
  0067-8856
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Colorado ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  305-310
• Volume:
  41
• NIOSHTIC Number:
  nn:20028873
• Citation:
  Biomed Sci Instrum 2005 Jan; 41:305-310
• Federal Fiscal Year:
  2005
• Performing Organization:
  Colorado State University, Fort, Collins, Colorado
• Peer Reviewed:
  True
• Start Date:
  20010930
• Source Full Name:
  Biomedical Sciences Instrumentation
• End Date:
  20040329
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ff8e6943faf14cdf361b2a8b655b8b44537e9d7af22cf935a4e0405ed2b25104a78a8e6aec0270e3abde1bc16ef04f14d66228110badc669859aee3425fe2ea4
• Download URL:
  https://stacks.cdc.gov/view/cdc/189969/cdc_189969_DS1.pdf
• File Type:
  [PDF - 1.16 MB ]