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Effect of specific resistance training on forearm pain and work disability in industrial technicians: cluster randomised controlled trial [with consumer summary]
Andersen LL, Jakobsen MD, Pedersen MT, Mortensen OS, Sjogaard G, Zebis MK
BMJ Open 2012 Feb;2(1):e000412
clinical trial
6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVES: To determine the effect of specific resistance training on forearm pain and work disability in industrial technicians. DESIGN AND SETTING: Two-armed cluster randomised controlled trial of 20 weeks performed at two industrial production units in Copenhagen, Denmark. PARTICIPANTS: Working-age industrial technicians both with and without pain and disability. INTERVENTIONS: The training group (n = 282) performed specific resistance training for the shoulder, neck and arm muscles three times a week. The control group (n = 255) was advised to continue normal physical activity. OUTCOME: All participants rated forearm pain intensity (visual analogue scale, 0 to 100 mm) once a week (primary outcome) and replied to a questionnaire on work disability (Disability of the Arm Shoulder and Hand, 0 to 100) at baseline and follow-up (secondary outcome). RESULTS: Questionnaires were sent to 854 workers of which 30 (n = 282) and 27 (n = 255) clusters were randomised to training and control, respectively. Of these, 211 and 237 participants, respectively, responded to the follow-up questionnaire. Intention-to-treat analyses including both individuals with and without pain showed that from baseline to follow-up, pain intensity and work disability decreased more in the training group than in the control group (4 to 5 on a scale of 0 to 100, p < 0.01 to 0.001). Among those with pain > 30 mm visual analogue scale at baseline (n = 54), the OR for complete recovery at follow-up in the training group compared with the control group was 4.6 (95% CI 1.2 to 17.9). Among those with work disability > 30 at baseline (n = 113), the OR for complete recovery at follow-up in the training group compared with the control group was 6.0 (95% CI 1.8 to 19.8). CONCLUSION: Specific resistance training of the shoulder, neck and arm reduces forearm pain and work disability among industrial technicians. TRIAL REGISTRATION NUMBER: NCT01071980.
Reproduced with permission from the BMJ Publishing Group.

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