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Background : Repetitive strain injuries caused by repetitive occupational work are difficult to prevent for multiple reasons. Therefore, we examined the effectiveness of manual therapy MT with rest to treat the inflammation and fibrosis that develops through the performance of a repetitive task. We hypothesized that this treatment would reduce task-induced sensorimotor declines and neuromuscular inflammation. Methods : Twenty-nine female Sprague-Dawley rats performed a reaching and lever-pulling task for 14weeks.
All ceased performing the task at 14weeks. Ten were euthanized at this timepoint TASK. Ten additional food restricted rats were included that neither performed the task nor received manual therapy FRC. Conclusion : In our model of repetitive motion disorder, manual therapy during rest had modest effects on behavioral, histological, and physiological measures, compared to rest alone.
These findings stand in contrast to the robust preventive effects of manual therapy in this same model. Musculoskeletal disorders secondary to repetitive occupational overuse are highly prevalent in many professions and include repetitive strain injuries Panagos et al. For example, in , there were ,days away from work cases in the United States private sector with 30 percent of the cases being due to musculoskeletal disorders Bureau of Labor Statistics, Repetitive strain injury is caused by repetitive, sustained, and forceful movements Byl and McKenzie, ; Gallagher and Heberger, These injuries and disorders have profound effects on the neuromuscular system which includes nerves and muscles; NIOSH, We have a rat model of occupational repetitive strain injury also considered an overuse injury model , in which rats voluntarily reach and pull on a lever bar at target reach rates and force levels for a food reward Barbe et al.
In this model, operant reach rates and force levels were determined from studies of risk exposure of humans performing similar work tasks Silverstein et al. We have shown that prolonged performance of a relatively high repetition and force lever-pulling task induces sensorimotor declines, and broad neuromuscular inflammation and fibrosis Clark et al. Manual therapy MT is any therapy that is applied to using the hands, including massage therapy and manipulative therapy.
Manual therapy has been practiced for centuries primarily for musculoskeletal disorders, repetitive strain injuries included. Previously, we found that manual therapy treatments prevent inflammatory responses in nerve, muscle, and tendinous tissues; as well as somatosensory hypersensitivity, pathological neural discharge, and motor declines that develop with performance of repetitive overuse tasks Bove et al.