Academic Journal
Effects of Slouched and Erect Sitting Postures on Upper Limb Kinematics During Tasks Associated with Musculoskeletal Disorder Risk.
| Τίτλος: | Effects of Slouched and Erect Sitting Postures on Upper Limb Kinematics During Tasks Associated with Musculoskeletal Disorder Risk. |
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| Συγγραφείς: | Tomezzoli A; Univ Lyon 1, Univ Gustave Eiffel, LBMC UMR_T 9406, Lyon, France., Naaim A; Univ Lyon 1, Univ Gustave Eiffel, LBMC UMR_T 9406, Lyon, France., Fréchède B; Univ Lyon 1, Univ Gustave Eiffel, LBMC UMR_T 9406, Lyon, France., Duprey S; Univ Lyon 1, Univ Gustave Eiffel, LBMC UMR_T 9406, Lyon, France. |
| Πηγή: | IISE transactions on occupational ergonomics and human factors [IISE Trans Occup Ergon Hum Factors] 2026 Oct-Dec; Vol. 14 (4), pp. 428-440. Date of Electronic Publication: 2026 May 21. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Taylor & Francis Group Country of Publication: England NLM ID: 101738444 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 2472-5846 (Electronic) Linking ISSN: 24725838 NLM ISO Abbreviation: IISE Trans Occup Ergon Hum Factors Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: [London] : Taylor & Francis Group, [2017]- |
| Ιατρικοί όροι (MeSH): | Upper Extremity*/physiology , Upper Extremity*/physiopathology , Musculoskeletal Diseases*/physiopathology , Musculoskeletal Diseases*/etiology , Posture*/physiology , Sitting Position*, Biomechanical Phenomena/physiology ; Range of Motion, Articular/physiology ; Humans ; Male ; Adult ; Female ; Young Adult ; Task Performance and Analysis |
| Περίληψη: | OCCUPATIONAL APPLICATIONSTo manage upper limb musculoskeletal disorders, treatments based on reducing spinal curvatures are used empirically. Spinal posture has been shown to modify upper limb functional capacities in terms of maximum voluntary forces and fatigability. The aim of the study was to determine whether spinal curvatures also influenced upper limb joint angles during tasks associated with a risk of musculoskeletal disorders. Twenty-two healthy participants were placed in a slouched or erect sitting posture, in random order. Three standardized tasks were performed three times each in both postures. In the erect posture, shoulder flexion was consistently decreased, and shoulder abduction was decreased over most or all of the tasks analyzed. Elbow extension was increased over half of the duration of a single task. Thus, slouched or erect seated spinal posture influences proximal upper limb joint angles. Ergonomists should consider spinal posture even when focusing on proximal upper limb musculoskeletal disorders. |
| Contributed Indexing: | Keywords: kinematics; occupational musculoskeletal disorders; sitting position; spinal curvatures; upper extremity Local Abstract: [plain-language-summary] Background: Musculoskeletal disorders are a major public health issue. Treatments based on reducing spinal curvatures are empirically used to manage upper limb musculoskeletal disorders. Spinal posture has been shown to modify upper limb functional capacities in terms of maximum voluntary forces and fatigability. However, to date and to our knowledge, the effect of spinal curvatures on kinematics has only been evaluated on the trunk and proximal upper limb during non-ecological tasks.Purpose: The aim of the study was to determine whether spinal curvatures influenced upper limb kinematics at the shoulder, elbow, and wrist, during tasks associated with a risk of musculoskeletal disorders.Methods: Twenty-two healthy, right-handed participants were included in a randomized experimental study with a crossover design. Participants were placed in a slouched or erect sitting posture, in random order, using oral instructions and light touch. Three standardized tasks, performed three times each in both postures, were recorded using an optoelectronic system: screwing against resistance, moving a box as far forward as possible, and painting above the shoulder level. Joint angles were computed by projecting each distal body segment into different planes of the proximal segmental coordinate system, to enable comparisons with ergonomic standards. Joint angles were compared using statistical parametric mapping paired Student t-tests.Results: In the erect posture, shoulder flexion was consistently decreased (p < 0.001 most often), and shoulder abduction was decreased over most or all of the tasks analyzed (p < 0.05). Elbow extension was increased over half of the duration of a single task (p < 0.05). Wrist angles were not modified.Conclusions: Slouched or erect seated spinal posture modified individuals’ shoulder and elbow kinematics and could thus influence the risk of upper limb musculoskeletal disorders at these levels. |
| Entry Date(s): | Date Created: 20260521 Date Completed: 20260925 Latest Revision: 20260925 |
| Update Code: | 20260925 |
| DOI: | 10.1080/24725838.2026.2666319 |
| PMID: | 42167255 |
| Βάση Δεδομένων: | MEDLINE |
| ISSN: | 2472-5846 |
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| DOI: | 10.1080/24725838.2026.2666319 |