The influence of dynamic factors on triaxial net muscular moments at the L5/S1 joint during asymmetrical lifting and lowering.

摘要: Asymmetrical lifting and lowering are predominant activities in the workplace. Mechanical causes suggested for many back injuries dynamic conditions within which spine loading occurs related to increase. More data on tridimensional biomechanical lumbar during asymmetrical needed. A multisegment model was developed compute spinal box-handling situations. The positions of anatomical markers were generated by a direct linear transformation algorithm adapted processing from two real virtual views (mirrors). Two force platforms measured external forces. Five male subjects performed three variations (slow, fast accelerated) asymmetric (slow fast) lowering. torsional, extension/flexion lateral bending net muscular moments at L5/S1 joint computed peak values selected statistical analysis. For task, accelerated showed significant increases over slow condition torsion, lateral-bending moments. also extension. comparison between tasks equivalent loadings torsion compared average maximal subject populations isokinetic dynamometry. This torsional extension 30 83% possible capacity, respectively. These results demonstrated that factors do influence load highlighted both spine. more complete analysis handling, velocity acceleration produced should be included.