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Can a new behaviorally oriented training process to improve lifting technique prevent occupationally related back
Steven A Lavender1, Eric P Lorenz, Gunnar B J Andersson
1Department of Industrial, Welding, Systems Engineering and Orthopaedics, The Ohio State University, Columbus, OH 43210, USA. lavender.1@osu.edu
Study Design:
A prospective randomized control trial.
Objective:
To determine the degree to which a new behavior-based lift training program (LiftTrainer; Ascension Technology, Burlington, VT) could reduce the incidence of low back disorder in distribution center jobs that require repetitive lifting.
Summary Of Background Data:
Most studies show programs aimed at training lifting techniques to be ineffective in preventing low back disorders, which may be due to their conceptual rather than behavioral learning approach.
Methods:
A total of 2144 employees in 19 distribution centers were randomized into either the LiftTrainer program or a video control group. In the LiftTrainer program, participants were individually trained in up to 5, 30-minute sessions while instrumented with motion capture sensors to quantify the L5/S1 moments. Twelve months following the initial training, injury data were obtained from company records.
Results:
Survival analyses (Kaplan-Meier) indicated that there was no difference in injury rates between the 2 training groups. Likewise, there was no difference in the turnover rates. However, those with a low (<30 Nm) average twisting moment at the end of the first session experienced a significantly (P < 0.005) lower rate of low back disorder than controls.
Conclusions:
While overall the LiftTrainer program was not effective, those with twisting moments below 30 Nm reported fewer injuries, suggesting a shift in focus for "safe" lifting programs.
