original abstract †Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.
BACKGROUND CONTEXT: Low back pain (LBP) is a disorder that commonly affects the working population, resulting in disability, health-care utilization, and a heavy socioeconomic burden. Although the etiology of LBP remains uncertain, occupational activities have been implicated. Evaluating these potentially causal relationships requires a methodologically rigorous approach. Occupational repetitive and/or heavy lifting is widely thought to be a risk factor for the development of LBP.
PURPOSE: To conduct a systematic review of the scientific literature to evaluate the causal relationship between occupational lifting and LBP.
STUDY DESIGN: Systematic review of the literature.
SAMPLE: Studies reporting an association between occupational lifting and LBP.
OUTCOME MEASURES: Numerical association between different levels of exposure to occupational lifting and the presence or severity of LBP.
METHODS: A search was conducted using Medline, EMBASE, CINAHL, Cochrane Library, OSH-ROM, gray literature (eg, reports not published in scientific journals), hand-searching occupational health journals, reference lists of included studies, and content experts. Evaluation of study quality was performed using a modified version of the Newcastle-Ottawa Scale. Levels of evidence were evaluated for specific Bradford-Hill criteria (association, dose-response, temporality, experiment, and biological plausibility).
RESULTS: This search yielded 2,766 citations, of which 35 studies met eligibility criteria and 9 were considered high methodological quality studies, including four case-controls and five prospective cohorts. Among the high-quality studies, there was conflicting evidence for association with four studies reporting significant associations and five studies reporting nonsignificant results. Two of the three studies that assessed dose-response demonstrated a nonsignificant trend. There were no significant risk estimates that demonstrated temporality. No studies were identified that satisfied the experiment criterion. Subgroup analyses identified certain types of lifting and LBP that had statistically significant results, but there were none that satisfied more than two of the Bradford-Hill criteria.
CONCLUSIONS: This review uncovered several high-quality studies examining a relationship between occupational lifting and LBP, but these studies did not consistently support any of the Bradford-Hill criteria for causality. There was moderate evidence of an association for specific types of lifting and LBP. Based on these results, it is unlikely that occupational lifting is independently causative of LBP in the populations of workers studied. Further research in specific subcategories of lifting would further clarify the presence or absence of a causal relationship.
- “Systematic review: occupational physical activity and low back pain,” B K Kwon, D M Roffey, P B Bishop, S Dagenais, and E K Wai, Occup Med (Lond), 2011.
- “Dose-response relationship between work-related cumulative postural exposure and low back pain: a systematic review,” Daniel Cury Ribeiro, Daniela Aldabe, J Haxby Abbott, Gisela Sole, and Stephan Milosavljevic, Ann Occup Hyg, 2012.
- “Effect of training and lifting equipment for preventing back pain in lifting and handling: systematic review,” KP Martimo, J Verbeek, J Karppinen, AD Furlan, EP Takala, PP Kuijer, M Jauhiainen, and E Viikari-Juntura, British Medical Journal, 2008.
- “Epidemiologic evidence on manual materials handling as a risk factor for back disorders: a systematic review,” Judith I Kuiper, Alex, Burdorfb, and Jos Verbeek, International Journal of Industrial Ergonomics, 1999.
This page is part of the PainScience BIBLIOGRAPHY, which contains plain language summaries of thousands of scientific papers & others sources. It’s like a highly specialized blog. A few highlights:
- Relationships Between Sleep Quality and Pain-Related Factors for People with Chronic Low Back Pain: Tests of Reciprocal and Time of Day Effects. Gerhart 2017 Ann Behav Med.
- Modulation in the elastic properties of gastrocnemius muscle heads in individuals with plantar fasciitis and its relationship with pain. Zhou 2020 Sci Rep.
- Association Between Plantar Fasciitis and Isolated Gastrocnemius Tightness. Nakale 2018 Foot Ankle Int.
- No Added Benefit of Combining Dry Needling With Guideline-Based Physical Therapy When Managing Chronic Neck Pain: A Randomized Controlled Trial. Stieven 2020 J Orthop Sports Phys Ther.
- Effectiveness of customised foot orthoses for Achilles tendinopathy: a randomised controlled trial. Munteanu 2015 Br J Sports Med.