Positive Health Online

Abstract

FAUCETT et al., University of California, San Francisco 94143, USA, E: jaf@itsa.ucsf.edu, tested two training interventions to prevent work-related musculoskeletal disorders of the upper limb.

Background

Two types of worker training interventions were investigated, both designed to reduce unnecessary muscle tension and the symptoms of work-related musculoskeletal disorders. The first of these was Muscle Learning Therapy (MLT), using electromyographic feedback and operant conditioning to decrease muscle tension. The second used adult learning and cognitive behavioural techniques in small group discussions to enhance workers’ stress management skills.

Methodology

Workers were randomly assigned to a control group or to either treatment. Interventions were conducted for 6 weeks with reinforcement training provided at 18 and 32 weeks post baseline. Symptom diaries and electromyographic readings of the trapezius and forearm muscles of both arms were taken at baseline, at the conclusion of the 6 weeks training period, and at 32 weeks, prior to the reinforcement training.

Results

Significant differences were found at 6 weeks in symptom severity, increasing for the control group and decreasing modestly for the education group, with little change for the MLT group. At 32 weeks follow-up, these differences were not maintained. The MLT group was consistently effective in reducing tension in the trapezius muscle both at 6 and at 32 weeks, and partially effective for the forearms.

Conclusion

Further testing of these training interventions is recommended, especially including periodic reinforcement of the workers’ learning.

References

Faucett J, Garry M, Nadler D, Ettare D. A test of two training interventions to prevent work-related musculoskeletal disorders of the upper extremity. Applied Ergonomics 33(4): 337-347, Jul 2002.