{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T10:41:59Z","timestamp":1777891319288,"version":"3.51.4"},"reference-count":74,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2024,9,11]],"date-time":"2024-09-11T00:00:00Z","timestamp":1726012800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["WOR"],"published-print":{"date-parts":[[2024,9,11]]},"abstract":"<jats:p>BACKGROUND: Work-related musculoskeletal disorders (WMSDs) located in the low back and neck\/shoulder regions are major concerns for both workers, workplaces, and society. Masons are prone to WMSD, because their work is characterized by repetitive work and high physical workload. However, the knowledge on the physical workload during bricklaying is primarily based on subjective measurements. OBJECTIVE: This cross-sectional field study with technical measurements aimed to quantify physical workload in terms of muscular activity and degree of forward bending during bricklaying at different working heights among masons, i.e., knee, hip, shoulder, and above shoulder height. METHODS: Twelve male (36.1\u00b116.1 years) experienced masons participated in a cross-sectional field study with technical measurements. Surface electromyography from erector spinae longissimus and upper trapezius muscles and an inertial measurement unit-sensor placed on the upper back were used to assess the physical workload (level of muscle activation and degree of forward bending) different bricklaying heights. Manual video analysis was used to determine duration of work tasks, frequency, type, and working height. The working heights were categorized as \u2018knee\u2019, \u2018hip\u2019, \u2018shoulder\u2019, and \u2018above shoulder\u2019. The 95 percentiles of the normalized Root Mean Square (RMSn) values were extracted assess from erector spinae and trapezius recordings to assess strenuous level muscle of muscle activation. RESULTS: The RMSn of dominant erector spinae muscle increased from hip- to shoulder height (from 26.6 to 29.6, P\u200a&lt;\u200a0.0001), but not from hip to above shoulder height and decreased from hip to knee height (from 26.6 to 18.9, P\u200a&lt;\u200a0.0001). For the dominant trapezius muscle, the RMSn increased from hip- to shoulder- and above shoulder height (from 13.9 to 19.7 and 24.0, respectively, P\u200a&lt;\u200a0.0001) but decreased from hip- to knee height (from 13.9 to 11.5, P\u200a&lt;\u200a0.0001). Compared to hip height (27.9\u00b0), an increased forward bending was detected during bricklaying at knee height (34.5\u00b0, P\u200a&lt;\u200a0.0001) and a decreased degree of forward bending at shoulder- and above shoulder height (17.6\u00b0 and 12.5\u00b0, P\u200a&lt;\u200a0.0001, respectively). CONCLUSION: Based on technical measurements, bricklaying at hip height showed the best compromise between muscular load and degree of forward bending. This study contributes to the development of the work environment for masons and can help guide preventive initiatives to reduce physical workload.<\/jats:p>","DOI":"10.3233\/wor-230325","type":"journal-article","created":{"date-parts":[[2024,3,19]],"date-time":"2024-03-19T11:59:40Z","timestamp":1710849580000},"page":"459-470","source":"Crossref","is-referenced-by-count":3,"title":["Influence of brick laying height on biomechanical load in masons: Cross-sectional field study with technical measurements"],"prefix":"10.1177","volume":"79","author":[{"given":"Mikkel","family":"Brandt","sequence":"first","affiliation":[{"name":"National Research Centre for the Working Environment, Copenhagen, Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R\u00fani","family":"Bl\u00e1foss","sequence":"additional","affiliation":[{"name":"National Research Centre for the Working Environment, Copenhagen, Denmark"},{"name":"Research Unit for Muscle Physiology and Biomechanics, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus Due","family":"Jakobsen","sequence":"additional","affiliation":[{"name":"National Research Centre for the Working Environment, Copenhagen, Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Afshin","family":"Samani","sequence":"additional","affiliation":[{"name":"ExerciseTech, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeppe Z.N.","family":"Ajslev","sequence":"additional","affiliation":[{"name":"National Research Centre for the Working Environment, Copenhagen, Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pascal","family":"Madeleine","sequence":"additional","affiliation":[{"name":"ExerciseTech, Department of Health Science and Technology, Faculty of 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