Authors

  1. Cooper, Kay PhD, MSc, BSc
  2. Kirkpatrick, Pamela MSc, MA (Hons), BA
  3. Stewart, Arthur PhD, MPhil, BSc (Hons)

Abstract

Review question/objective: The quantitative objective is to identify the known and/or potential health effects of working in the wind power generation industry. More specifically the objectives are to identify:

 

1. The musculoskeletal and other physical health risks to onshore wind technicians associated with the repeated climbing of vertical ladders;

 

2. The musculoskeletal and other physical health risks to onshore wind technicians associated with working in confined spaces within wind turbine structures.

 

The qualitative objective is to identify onshore wind technicians' and/or related workers' perceptions and experiences of work-related musculoskeletal and other physical health disorders.

 

The textual objective is to identify the issues related to musculoskeletal and other physical health risks of working in the wind power generation industry.

 

Background: Renewable energy is a developing technology within the UK and beyond, with onshore wind the most developmentally advanced and currently the most cost-effective source.1 Employment within this sector is estimated to grow from 10,000 workers in 2010 to 88,000 by 2021.1 In addition to the legal requirement for employers to protect their employees from health and safety risks,2 there is growing evidence that employers across a range of sectors are increasingly concerned about employee health and its impact on sickness absence rates and productivity.3, 4 Musculoskeletal disorders (MSDs), such as low back pain, muscle strains and joint sprains, are a group of conditions that account for a large proportion of sickness absence and long-term incapacity in the UK, costing an estimated [zeta]7 billion in 2007.5 It is therefore important that appropriate preventative measures are in place to protect employees from the known risks associated with particular tasks and that appropriate healthcare interventions are available to keep employees at work, or return them to work in a timely manner when they are affected by MSDs.

 

Wind farm technicians (wind technicians) who routinely service onshore wind turbines are required to ascend the tower to the nacelle (cover housing containing the generating components), where the majority of maintenance tasks are carried out; a distance that can be over 120 vertical meters for one journey up and back down. Several journeys may be necessary in order to maintain a single turbine, or alternatively several turbines may be serviced by a single technician on any one day. This may involve only manual ladder climbing, or a combination of manual and lift-assisted climbs in larger towers. While many of the most obvious hazards have been nullified by the provision of fall-arrest technologies and safe systems of work, some hazards remain, even in the normal operating environment. These include slipping hazards, due to low friction on ladders,6 snagging hazards where vertical progress is impaired by protruding obstructions,7 or transitioning from the ladder onto a platform and vice versa as a likely scenario for ladder fall accidents.8 The exertion required in order to reach the upper parts of the tower may not exceed the fitness required in young adult workers; however, under some conditions such as load carrying or abnormal ambient temperatures, the level of exertion is likely to increase and muscular work efficiency to decrease, with implications for task performance and health. Any occupational work that routinely includes climbing multiple vertical ladders, load carrying and working in confined spaces carries health implications for the employee. In onshore wind technicians, these tasks are performed routinely in remote environments, which are subject to adverse weather conditions. While such factors prevail amongst other industries, their precise combination in the wind farming industry may put technicians at risk of developing new, or exacerbating existing, MSDs. Such MSDs could be short-lived; however they could also, with repeated exposure to the risks, become chronic conditions that interfere with quality of life and one's ability to carry out work-related tasks, leading to a loss of productivity and/or sickness absence. An understanding of the risks to wind technicians from common working practices will enable the industry to make appropriate health and safety decisions and will also assist healthcare workers involved in managing the care of wind technicians with MSDs, or developing novel interventions for the prevention and management of MSDs in this population.

 

To date, no systematic review has been conducted on the health risks to onshore wind technicians. A systematic review of MSDs in telecommunication workers considered service technicians and call center employees, whose job functions included working in confined spaces.9 While the technicians' work included ladder use, these were portable and the risks were identified as the weight of the ladder, loading on and off vehicles and carrying it on the shoulder, rather than the ladder climbing itself.

 

In a study of the offshore petroleum industry population, MSDs were the most frequently reported work-related disorder, affecting 47% of the Norwegian sector workers and being highest amongst maintenance workers.10 The exposures for this were identified as a high physical workload (38% of cases), repetitive work (26% of cases) and hard surface walking or ladder climbing (10% of cases). The upper limb and back were the most frequent areas of injury, but the study recommended further investigation of ladder climbing and knee disorders.

 

A range of factors mean that the long-term consequences for employee health associated with the duties of wind technicians are currently poorly understood. These factors include the relative recency with which the renewable energy industry has become established, with the first commercial wind farm in the UK being built in 1991.1 Other factors include the demographics of the workforce and the occupational health governance arrangements, informed from other industries. This systematic review aims to establish the best evidence to date on the known and potential occupational health risks to wind technicians as a consequence of their work, thus enabling the onshore wind industry to make health and safety-related decisions on the most robust evidence available and to allow those responsible for the health of wind technicians to make appropriate decisions regarding their care.

 

Article Content

Inclusion criteria

Types of participants

The quantitative and qualitative components of this review will consider studies that include adult onshore wind technicians. In the absence of studies directly relating to onshore wind technicians, participants from other related sectors (i.e. occupations that involve repeated vertical ladder climbing and/or confined space working similar to turbine structures) will be considered. These participants include, but are not restricted to, telecommunications workers, offshore oil and gas workers, construction and maintenance workers and electricians. The specific environmental health effects associated with offshore wind and marine developments are not within the scope of this review.

 

The textual component of this review will consider the same participants as the quantitative and qualitative components, but will also include occupational health and safety experts, health professionals, employers and industry bodies.

 

Types of intervention(s)/phenomena of interest

The quantitative component of the review will consider studies that evaluate the musculoskeletal and other physical health risks to onshore wind technicians and related others associated with the repeated climbing of vertical ladders and working in confined spaces.

 

The qualitative component of this review will consider studies that investigate onshore wind technicians' and related others' perceptions and experiences of work-related musculoskeletal and other physical health disorders.

 

The textual component of this review will consider publications that describe the issues related to musculoskeletal and other physical health risks of working in the wind power generation and related industries.

 

The possible mental health risks associated with working in the wind power generation industry are not within the scope of this review.

 

Context

This review will consider health-related outcomes of employees in the onshore wind power generation industry and other related industries with similar activities and environments (such as telecommunications, offshore oil and gas and electrical engineering).

 

Types of outcomes

This review will consider studies that include the following quantitative outcome measures:

 

- Prevalence and incidence of musculoskeletal and related physical disorders;

 

- Type and severity of musculoskeletal and related physical disorders including pain, quality of life and physical function;

 

- Occupational measures such as absenteeism;

 

- Outcomes related to mental health, confined space rescue, at-height rescue or fatalities are not within the scope of this review.

 

 

Types of studies

The quantitative component of the review will consider both analytical and descriptive epidemiological study designs including prospective and retrospective cohort studies, case control studies, case series, individual case reports and cross sectional studies for inclusion.

 

The qualitative component of the review will consider studies that focus on qualitative data including, but not limited to, designs such as phenomenology, grounded theory, ethnography, action research and feminist research.

 

In the absence of research studies, other texts such as opinion papers and reports will be considered.

 

The textual component of the review will consider expert opinion, discussion papers, position papers and other texts.

 

Search strategy

The search strategy aims to find both published and unpublished studies. A three-step search strategy will be utilized in this review. An initial limited search of Web of Knowledge, Business Science Complete (BSC) and Medline will be undertaken, followed by analysis of the text words contained in the title and abstract and of the index terms used to describe the articles. A second search using all identified keywords and index terms will then be undertaken across all included databases. Thirdly, the reference lists of all identified reports and articles will be searched for additional studies. Only studies published in English will be considered for inclusion in this review, since translation services are not available to the review team. No search limits will be applied in terms of year of publication both because the review is focused on an industry in its relative infancy, and because of the limited number of articles found during initial scoping.

 

The databases to be searched include:

 

Medline, AMED, EmBase, CINAHL, IEEE, Science Direct, Springerlink, ASSIA, Westlaw, Lexus, Avery, OnePetro, Construction & Building Abstracts, Construction Information Service, Business Source Complete, Web of Knowledge, Joanna Briggs Institute Library, PROSPERO.

 

The search for unpublished studies will include:

 

Google, Google Scholar, Conference proceedings, Center for Reviews and Dissemination, OpenDOAR, International Newsstand.

 

Initial keywords to be used will be:

 

Ladder

 

Injury

 

Musculoskeletal

 

Climb*

 

Work*

 

Occupation*

 

Confined Space

 

Assessment of methodological quality

Quantitative papers selected for retrieval will be assessed by two independent reviewers for methodological validity prior to inclusion in the review using standardized critical appraisal instruments from the Joanna Briggs Institute Meta Analysis of Statistics Assessment and Review Instrument (JBI-MAStARI) (Appendix I). Any disagreements that arise between the reviewers will be resolved through discussion, or with a third reviewer.

 

Qualitative papers selected for retrieval will be assessed by two independent reviewers for methodological validity prior to inclusion in the review using standardized critical appraisal instruments from the Joanna Briggs Institute Qualitative Assessment and Review Instrument (JBI-QARI) (Appendix I). Any disagreements that arise between the reviewers will be resolved through discussion, or with a third reviewer.

 

Textual papers selected for retrieval will be assessed by two independent reviewers for authenticity prior to inclusion in the review using standardized critical appraisal instruments from the Joanna Briggs Institute Narrative, Opinion and Text Assessment and Review Instrument (JBI-NOTARI) (Appendix I). Any disagreements that arise between the reviewers will be resolved through discussion, or with a third reviewer.

 

Data collection

Quantitative data will be extracted from papers included in the review using the standardized data extraction tool from JBI-MAStARI (Appendix II). The data extracted will include specific details about the interventions, populations, study methods and outcomes of significance to the review question and specific objectives.

 

Qualitative data will be extracted from papers included in the review using the standardized data extraction tool from JBI-QARI (Appendix II). The data extracted will include specific details about the interventions, populations, study methods and outcomes of significance to the review question and specific objectives.

 

Textual data will be extracted from papers included in the review using the standardized data extraction tool from JBI-NOTARI (Appendix VI). The data extracted will include specific details about the interventions, populations, study methods and outcomes of significance to the review question and specific objectives.

 

Data synthesis

Quantitative papers will, where possible, be pooled in statistical meta-analysis using JBI-MAStARI. All results will be subject to double data entry. Effect sizes expressed as a relative risk for cohort studies, odds ratios for case control studies (for categorical data) and weighted mean differences (for continuous data) and their 95% confidence intervals will be calculated for analysis. A random effects model will be used and heterogeneity will be assessed statistically using the standard chi-square test. However, it is likely that statistical pooling will not be possible. In this case, the findings will be presented in narrative form including tables and figures to aid in data presentation where appropriate.

 

Qualitative research findings will, where possible, be pooled using JBI-QARI. This will involve the aggregation or synthesis of findings to generate a set of statements that represent that aggregation, through assembling the findings (Level 1 findings) rated according to their quality and categorizing these findings on the basis of similarity in meaning (Level 2 findings). These categories are then subjected to a meta-synthesis in order to produce a single comprehensive set of synthesized findings (Level 3 findings) that can be used as a basis for evidence-based practice. Where textual pooling is not possible, the findings will be presented in narrative form.

 

Textual papers will, where possible, be pooled using JBI-NOTARI. This will involve the aggregation or synthesis of conclusions to generate a set of statements that represent that aggregation, through assembling and categorizing these conclusions on the basis of similarity in meaning. The first step will generate a set of statements that represent the aggregated data through assembling the conclusions rated according to their quality. Then, findings will be categorized based on similarity of meaning. The final step will be through meta-aggregation of the categories to produce a single comprehensive set of synthesized findings that can be used as a basis for evidence-based practice.

 

Conflicts of interest

None

 

Acknowledgements

Funding: Renewable UK

 

References

 

1. Renewable UK [online]. Available from: http://renewableuk.com [accessed 10.07.13].2013. [Context Link]

 

2. Health & Safety Executive. Health & Safety Legislation - laws in the workplace [online]. Available from: http://www.hse.gov.uk/legislation.2013.[Context Link]

 

3. Burton J. World Health Organisation Healthy Workplace Framework and Model: Background and supporting literature and practice. WHO Geneva.2010. [Context Link]

 

4. Ward D. Sickness Absence Review. Department of Work & Pensions, London.2010. [Context Link]

 

5. Black C. Health, Work and Wellbeing Programme. Dame Carol Black's review of the health of Britain's working age population. Working for a healthier tomorrow. The Stationery Office, London.2008. [Context Link]

 

6. Bloswick DS, Chaffin DB. An ergonomic analysis of the ladder climbing activity. INternational Journal of Industrial Ergonomics.1990; 6: 17-27. [Context Link]

 

7. Nichols N. Inside wind towers. American Society of Safety Engineers. The Utility Connection.2011; 2 (2): 3-7. [Context Link]

 

8. Cohen HH, Lin LJ. A retrospective case-control study of ladder fall accidents. Journal of Safety Research.1991; 22: 21-30. [Context Link]

 

9. Crawford JO, Laiou E, Spurgeon A, McMillan G. Musculoskeletal disorders within the telecommunications sector - A systematic review. Industrial Ergonomics.2008; 38 (7-8): 561-76. [Context Link]

 

10. Morken T, Mehlu AS, Moen B. Work-related musculoskeletal disorders in Norway's offshore petroleum industry. Occupational Medicine.2007; 57: 112-7. [Context Link]

Appendix I: Appraisal instruments

 

MAStARI appraisal instruments

 

QARI appraisal instrument

 

NOTARI appraisal instrument[Context Link]

Appendix II: Data extraction instruments

MAStARI data extraction instrument

 

QARI data extraction instrument

 

NOTARI data extraction instrument[Context Link]

 

Keywords: Ladder; Injury; Musculoskeletal; Climb*; Work*; Occupation*; Confined Space