Patient-friendly summary
If you read nothing else
Bottom line
Workplace strength training is supported by strong evidence for reducing musculoskeletal disorders in physically demanding jobs, while participatory ergonomics, multifaceted programs, and stress management showed no clear benefit (though heterogeneity warrants caution).
Moderate evidencePublished
Evidence hierarchy
Study participants
Adult workers with physically demanding jobs (construction, manufacturing, health care, etc.) who had musculoskeletal disorders, across 19 countries (mostly European/Scandinavian)
Study Summary
This systematic review evaluated the effectiveness of workplace interventions for rehabilitating musculoskeletal disorders (MSDs) among employees with physically demanding work, synthesizing evidence from 54 high- and medium-quality studies (36 RCTs and 18 non-RCTs) published 1998-2018. Using the Institute for Work & Health best-evidence-synthesis approach, the authors found moderate evidence that workplace physical exercise reduces MSD, and strong evidence that workplace strength training specifically has a positive effect (all 9 strength-training studies pointed the same direction). There was limited evidence for ergonomics (not enough to guide practice) and strong evidence for no benefit from participatory ergonomics, multifaceted interventions, and stress management. The authors emphasize that because several intervention domains were very heterogeneous, conclusions about their effectiveness should be made with care, and that lack of effect may partly reflect implementation challenges rather than the interventions themselves.
Key Findings
| Finding | Detail | Impact |
|---|---|---|
| Strong evidence that workplace strength training reduces MSD | Within the physical exercise domain, all 9 strength-training studies (9 interventions; 5 from high-quality and 4 from medium-quality studies) pointed in the same positive direction, producing a stakeholder recommendation: 'Implementing strength training at the workplace can help reduce MSD among workers with physically demanding work.' | High |
| Moderate evidence that physical exercise overall has a positive effect | 16 of 23 interventions across 20 studies supported workplace physical exercise on MSD outcomes, yielding moderate evidence and a 'practice consideration' to consider implementing workplace exercise where applicable to the work context. | High |
| Limited evidence for ergonomics - not enough to guide practice | Across 13 ergonomics studies (15 interventions), 10 interventions showed no effect, producing limited evidence of no benefit and the message that there is not enough scientific evidence to guide current policies/practices. | Medium |
| Strong evidence for no benefit of participatory ergonomics, multifaceted interventions, and stress management | All 7 participatory ergonomics interventions, 13 of 16 multifaceted interventions, and all 3 stress-management interventions showed no benefit on MSD. The authors caution these domains were highly heterogeneous and lack of effect may partly reflect difficulties implementing such interventions in physically demanding workplaces. | Medium |
| Aerobic training and stretching had insufficient/mixed evidence | Aerobic training (5 interventions, limited evidence) and stretching (4 interventions, mixed evidence) within the physical exercise domain did not provide enough evidence to guide practice. | Low |
| No intervention domain was associated with negative effects | The review explicitly states that none of the intervention domains were associated with 'negative effects' on MSD outcomes. | Low |
Within the physical exercise domain, all 9 strength-training studies (9 interventions; 5 from high-quality and 4 from medium-quality studies) pointed in the same positive direction, producing a stakeholder recommendation: 'Implementing strength training at the workplace can help reduce MSD among workers with physically demanding work.'
16 of 23 interventions across 20 studies supported workplace physical exercise on MSD outcomes, yielding moderate evidence and a 'practice consideration' to consider implementing workplace exercise where applicable to the work context.
Across 13 ergonomics studies (15 interventions), 10 interventions showed no effect, producing limited evidence of no benefit and the message that there is not enough scientific evidence to guide current policies/practices.
All 7 participatory ergonomics interventions, 13 of 16 multifaceted interventions, and all 3 stress-management interventions showed no benefit on MSD. The authors caution these domains were highly heterogeneous and lack of effect may partly reflect difficulties implementing such interventions in physically demanding workplaces.
Aerobic training (5 interventions, limited evidence) and stretching (4 interventions, mixed evidence) within the physical exercise domain did not provide enough evidence to guide practice.
The review explicitly states that none of the intervention domains were associated with 'negative effects' on MSD outcomes.
Strengths
- Included both RCTs and non-RCTs using the IWH best-evidence-synthesis approach, capturing valuable workplace evidence that an RCT-only review would have excluded (18 of 54 studies were non-RCTs).
- Relevant stakeholders from construction and manufacturing work-environment communities were engaged across review steps, increasing practical relevance and dissemination.
- Comprehensive search of PubMed/MEDLINE and Web of Science Core Collection plus snowball searching; 15,556 records screened down to 54 synthesized studies.
- Authors were contacted to clarify whether ambiguous studies were workplace-based, allowing inclusion of studies that would otherwise have been excluded.
- Prospectively registered in PROSPERO with a previously published protocol; structured 16-item IWH quality appraisal with two independent assessors.
Limitations
- Substantial heterogeneity in outcomes, study designs, and workplace contexts prevented meta-analysis, so the synthesis relied on a vote-counting-style best-evidence approach.
- The best-evidence synthesis does not account for sample size - small studies count as much as large ones.
- Findings are geographically skewed: 27 of 54 studies were from Scandinavia and only 13 from outside Europe, limiting generalizability.
- Possible publication bias and language-restriction bias (English-only inclusion); studies with positive results may have been more likely to be eligible.
- Heterogeneous domains (ergonomics, participatory ergonomics, multifaceted) could not be subdivided meaningfully, and lack of effect may reflect poor implementation rather than ineffective interventions.
- Duration of MSD in included studies was not reported, and the longest follow-up was generally used, which could introduce some bias.
Key Takeaways for Patients
What This Means for You
- 01If your job is physically demanding and you have muscle or joint pain, a structured strength-training program at work has the strongest evidence for helping reduce that pain.
- 02Workplace exercise in general may help, especially when it fits your specific type of work.
- 03The review did not find clear evidence that ergonomics changes, worker-led (participatory) ergonomics programs, broad multi-part workplace programs, or stress-management at work reduce musculoskeletal pain - but this does not necessarily mean they cannot help; the studies were varied and may have been hard to implement well.
- 04None of the workplace approaches studied made musculoskeletal symptoms worse.
- 05These findings come mostly from European, especially Scandinavian, workplaces, so they may not apply equally everywhere.
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