The Impact of Mental Processing and Pacing on Spine Loading

摘要: Study Design. The impact of various levels mental processing and pacing (during lifting) on spine loading was monitored under laboratory conditions. Objectives. To explore how demands influence the biomechanical response subsequent and, to determine whether individual characteristics have a modifying role in responses. Summary Background Data. Modern work often requires rapid physical exertions along with (both psychosocial stressors). While effect workplace factors has been widely documented, few studies investigated that interaction loads. Methods. For this study, 60 subjects lifted boxes while completing two types tasks: 1) series tasks decisions occurring before act lifting, 2) simultaneous concurrently lift. both these conditions, intensities load were evaluated: simple complex. Task also adjusted slow fast Finally, (personality gender) evaluated as potential modifiers. An electromyographically assisted model three-dimensional loads experimental Results. Simultaneous had largest loads, complex intensity resulting increases 160 N lateral shear, 80 anteroposterior 700 compression. Increased task pace produced greater shear (by 20 N), compression 410 N). Gender personality influenced loadings by much 17%. Conclusions. Mental stress acted catalyst for responses, leading intensified loading. appeared occur function time pressures performance resulted less controlled movements trunk muscle coactivation. These adjustments significantly increased results suggest mechanism increase low back pain risk from caused modern demands. [