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Development in the work ability, productivity, rating of exertion, and need for recovery during the intervention period. Work ability, productivity, and rating of exertion are presented on a scale from 0 to 10 (primary vertical axis). Need for recovery is presented on a scale from 0-100 (secondary vertical axis). *p < 0.05 significant change between baseline and 12 month follow-up in the aerobic exercise group compared to the reference group
