{"title":"Exploring the effects of task design on the flexion-relaxation phenomenon in the lumbar spine during repetitive lifting.","authors":"Benjamin A McIntosh, Kayla M Fewster","doi":"10.1080/00140139.2025.2559968","DOIUrl":null,"url":null,"abstract":"<p><p>Repetitive forward flexion of the lumbar spine can result in creep deformation which can disrupt load sharing between active and passive tissues. Lumbar spine kinematics and lumbar erector spinae (LES) electromyography were used to measure flexion relaxation (FR) angle changes across two lifting conditions matched for cumulative external load (Condition 1: 75 lifts of 13 kg load, Condition 2: 150 lifts of 6.5 kg load). Males showed increases in FR onset angle in response to the low load, high repetition condition, while females displayed increases in these metrics in the high load, low repetition condition. This work suggests that task design of a repetitive lifting task, and creep accumulation in the lumbar spine may be sex specific and future work should look to consider both task parameters, as well as worker demographics when designing and evaluating repetitive lifting task.</p>","PeriodicalId":50503,"journal":{"name":"Ergonomics","volume":" ","pages":"1-13"},"PeriodicalIF":2.4000,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ergonomics","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1080/00140139.2025.2559968","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, INDUSTRIAL","Score":null,"Total":0}
引用次数: 0
Abstract
Repetitive forward flexion of the lumbar spine can result in creep deformation which can disrupt load sharing between active and passive tissues. Lumbar spine kinematics and lumbar erector spinae (LES) electromyography were used to measure flexion relaxation (FR) angle changes across two lifting conditions matched for cumulative external load (Condition 1: 75 lifts of 13 kg load, Condition 2: 150 lifts of 6.5 kg load). Males showed increases in FR onset angle in response to the low load, high repetition condition, while females displayed increases in these metrics in the high load, low repetition condition. This work suggests that task design of a repetitive lifting task, and creep accumulation in the lumbar spine may be sex specific and future work should look to consider both task parameters, as well as worker demographics when designing and evaluating repetitive lifting task.
期刊介绍：
Ergonomics, also known as human factors, is the scientific discipline that seeks to understand and improve human interactions with products, equipment, environments and systems. Drawing upon human biology, psychology, engineering and design, Ergonomics aims to develop and apply knowledge and techniques to optimise system performance, whilst protecting the health, safety and well-being of individuals involved. The attention of ergonomics extends across work, leisure and other aspects of our daily lives.
The journal Ergonomics is an international refereed publication, with a 60 year tradition of disseminating high quality research. Original submissions, both theoretical and applied, are invited from across the subject, including physical, cognitive, organisational and environmental ergonomics. Papers reporting the findings of research from cognate disciplines are also welcome, where these contribute to understanding equipment, tasks, jobs, systems and environments and the corresponding needs, abilities and limitations of people.
All published research articles in this journal have undergone rigorous peer review, based on initial editor screening and anonymous refereeing by independent expert referees.
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