Does good trunk extensor performance protect against back-related work disability?

Abstract

In this cohort study, dynamic trunk extensor performance was studied as a predictor of permanent work disability due to back disorders. As part of the comprehensive Mini-Finland Health Survey in 1978-80, the back muscle performance of 535 persons (267 men, 268 women) was measured using standardized repetitive arch-up and sit-up tests. At baseline, the participants were between 30 and 64 years of age. Retirements were followed for 12 years on average. During the follow-up, 56 subjects developed permanent work disability; 15 of these cases were back-related. Good dynamic trunk extensor performance was predictive of a decreased incidence of work disability due to chronic back disorders but not work disability due to other diseases. The risk of back-related work disability in the three highest quartiles in relation to the lowest quartile of dynamic trunk extension capacity was 0.28 (95% confidence interval, 0.09-0.94). Our study suggests that good dynamic trunk extension performance may protect against back-related permanent work disability.

Trunk Muscles’ Response to Core Stability Exercises in Patients With Chronic Low Back Pain: A Randomized Controlled Trial

“…Spinal extensors' endurance has been shown to be correlated with decreases in injury risk for the low back [48]. Poor trunk muscular endurance as well as poor flexors'/extensors' endurance ratios hve also been correlated with a history of low back injury [49].…”

Isometric Trunk Muscle Strength and Body Sway in Relation to Low Back Pain in Young Adults

“…22 Furthermore, good dynamic trunk muscle strength has been suggested to protect against back-related work disability among adults. 23 In adolescents, poor trunk extensor strength combined with increased lumbar mobility predicts LBP. 6 In contrast to these previous studies, our study did not show significant association between LBP symptoms (pain and activity limitations) and poor muscle strength.…”

Dynamic Surface Electromyographic Responses in Chronic Low Back Pain Treated by Traditional Bone Setting and Conventional Physical Therapy

“…In several studies, exercise-based active back rehabilitation programs have been shown to be effective in reducing LBP intensity and to improve back extension strength and mobility. [19][20][21] Rissanen et al 22 reported that good dynamic trunk extensor performance is predictive of a decreased incidence of work disability as a result of chronic back disorders.…”