The effect of ship accelerations on three-dimensional low back loading during lifting and pulling activities

Manual materials handling on a moving platform, like a ship, might be a risk factor for the development of lowback pain due to the in.uence of accelerations on lowback loading. In the current simulation study, 3-D accelerations, measured on a frigate were applied to the kinematics of symmetrical and asymmetrical lifting movements and to a pulling task that had been performed under stable conditions. The aim was to find out to what extent low back loading is increased when the task execution is not adapted to the ship accelerations. Unfavorable timing, analyzed using the 99th percentile of predicted lowback moments, resulted in only a moderate (up to 15%) increase of extending and total lowback moments, and in a substantial increase of the twisting moment (up to 67%) during asymmetrical lifting. Moments in the pulling task were low and were relatively unaffected by ship accelerations, but adaptation of the movement pattern to prevent falling would be needed more often than during lifting. It furthermore appeared that a substantial reduction of lowback loading by favorable timing is not a realistic option. Designing tasks in such a way that they are located midship would reduce the 99th percentile of predicted low back moments. During lifting, orienting the task in such a way that the feet are pointing sideward relative to the ship reduces the predicted peak twisting moment at the low back compared to pointing the feet forward or backward.

[1]  J H van Dieën,et al.  Total trunk muscle force and spinal compression are lower in asymmetric moments as compared to pure extension moments. , 1999, Journal of biomechanics.

[2]  J H van Dieën,et al.  Asymmetric low back loading in asymmetric lifting movements is not prevented by pelvic twist. , 1998, Journal of biomechanics.

[3]  I. Kingma,et al.  Validation of a full body 3-D dynamic linked segment model , 1996 .

[4]  S. McGill,et al.  Measured and modelled static and dynamic axial trunk torsion during twisting in males and females. , 1990, Journal of biomedical engineering.

[5]  R Kadefors,et al.  Musculo-skeletal symptoms as related to working conditions among Swedish professional fisherman. , 1988, Applied ergonomics.

[6]  W S Marras,et al.  Spine loading during asymmetric lifting using one versus two hands. , 1998, Ergonomics.

[7]  R Kadefors,et al.  Working on a moving surface--a biomechanical analysis of musculo-skeletal load due to ship motions in combination with work. , 1994, Ergonomics.

[8]  M. Nordin,et al.  1988 Volvo Award in Biomechanics: The Triaxial Coupling of Torque Generation of Trunk Muscles during Isometric Exertions and the Effect of Fatiguing Isoinertial Movements on the Motor Output and Movement Patterns , 1988, Spine.

[9]  A Garg,et al.  Revised NIOSH equation for the design and evaluation of manual lifting tasks. , 1993, Ergonomics.

[10]  J. Kelsey,et al.  An epidemiologic study of lifting and twisting on the job and risk for acute prolapsed lumbar intervertebral disc , 1984, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[11]  Huub M. Toussaint,et al.  Evaluation of the Probability of Spinal Damage Caused by Sustained Cyclic Compression Loading , 1997, Hum. Factors.

[12]  A H Wertheim,et al.  Working in a moving environment. , 1998, Ergonomics.

[13]  A. Hof,et al.  An explicit expression for the moment in multibody systems. , 1992, Journal of biomechanics.

[14]  H. Kemper,et al.  Maximal oxygen uptake during cycling is reduced in moving environments; consequences for motion-induced fatigue , 2002, Ergonomics.

[15]  K Burton,et al.  Biomechanics of human movement: applications in rehabilitation, sports and ergonomics N Berme and A Cappozzo, Eds Bertec Corp., Worthington, Ohio, 1990, 545 pp, $US56.50. [Bertec, 819 Loch Lomond Lane, Worthington, Ohio 43085, USA]. , 1992, Clinical biomechanics.

[16]  W. E. Hoogendoorn,et al.  Flexion and Rotation of the Trunk and Lifting at Work Are Risk Factors for Low Back Pain: Results of a Prospective Cohort Study , 2000, Spine.

[17]  C. E. Clauser,et al.  Anthropometric Relationships of Body and Body Segment Moments of Inertia , 1980 .

[18]  F. Veldpaus,et al.  A least-squares algorithm for the equiform transformation from spatial marker co-ordinates. , 1988, Journal of biomechanics.