{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T21:08:44Z","timestamp":1777669724524,"version":"3.51.4"},"reference-count":74,"publisher":"SAGE Publications","issue":"11","license":[{"start":{"date-parts":[[2023,12,6]],"date-time":"2023-12-06T00:00:00Z","timestamp":1701820800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Employers\u2019 Association of the Metal and Electric Industry Baden-W\u00fcrttemberg"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Hum Factors"],"published-print":{"date-parts":[[2024,11]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To examine the effect of concurrent physical and cognitive demands as well as age on indicators of muscle fatigue at the wrist.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>There are few studies examining risk indicators for musculoskeletal disorders associated with work-related physical and cognitive demands that often occur simultaneously in the workplace.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Twenty-four\u2009gender-balanced older and 24 gender-balanced younger (mean age 60 and 23\u00a0years) participants performed four 30\u00a0min dual tasks. Tasks differed by the muscular load level during force tracking: 5% and 10% of maximum voluntary contraction force (MVC) and concurrent cognitive demands on the working memory: easy and difficult. Muscle fatigue was assessed by MVC decline and changes in surface electromyography (increased root mean square: RMS, decreased median frequency: MF) at the extensor digitorum (ED) and extensor carpi ulnaris (EU).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A decline in MVC was found in all participants when tracking was performed at 10% MVC (mean \u00b1 SD: 137.9 \u00b1 49.2 \u2013 123.0 \u00b1 45.3\u00a0N). Irrespective of age, muscular, or cognitive load, RMS increased (ED 12.3 \u00b1 6.5 \u2013 14.1 \u00b1 7.0% MVE, EU 15.4 \u00b1 7.6 \u2013 16.9 \u00b1 8.6% MVE) and MF decreased (ED 85.4 \u00b1 13.6 \u2013 83.2 \u00b1 12.8\u00a0Hz, EU 107.2 \u00b1 17.1 \u2013 104.3 \u00b1 16.7\u00a0Hz) in both muscles. However, changes in MF of EU tended to be more pronounced in the older group at higher cognitive and lower muscular load, without reaching statistical significance.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Maximum voluntary contraction indicated no interaction between muscle fatigue, cognitive load, or age. However, the tendencies toward altered muscle activity due to an increase in cognitive load and older age suggest muscular adaptations while maintaining tracking performance during the onset of fatigue signs in the sEMG signal.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Application<\/jats:title>\n                    <jats:p>If the tendencies in muscle activity are confirmed by further studies, ergonomic assessments in industrial workplaces should consider cognitive load and age when describing the risk of musculoskeletal disorders.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/00187208231218196","type":"journal-article","created":{"date-parts":[[2023,12,7]],"date-time":"2023-12-07T00:29:23Z","timestamp":1701908963000},"page":"2433-2450","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Wrist Extensor Muscle Fatigue During a Dual Task With Two Muscular and Cognitive Load Levels in Younger and Older Adults"],"prefix":"10.1177","volume":"66","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1955-6810","authenticated-orcid":false,"given":"Florestan","family":"Wagenblast","sequence":"first","affiliation":[{"name":"Institute of Occupational and Social Medicine and Health Services Research, University Hospital T\u00fcbingen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"L\u00e4ubli","sequence":"additional","affiliation":[{"name":"Institute of Occupational and Social Medicine and Health Services Research, University Hospital T\u00fcbingen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Seibt","sequence":"additional","affiliation":[{"name":"Institute of Occupational and Social Medicine and Health Services Research, University Hospital T\u00fcbingen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Monika A.","family":"Rieger","sequence":"additional","affiliation":[{"name":"Institute of Occupational and Social Medicine and Health Services Research, University Hospital T\u00fcbingen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9622-6511","authenticated-orcid":false,"given":"Benjamin","family":"Steinhilber","sequence":"additional","affiliation":[{"name":"Institute of Occupational and Social Medicine and Health Services Research, University Hospital T\u00fcbingen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2023,12,6]]},"reference":[{"key":"bibr1-00187208231218196","doi-asserted-by":"publisher","DOI":"10.1002\/mus.10116"},{"key":"bibr2-00187208231218196","doi-asserted-by":"publisher","DOI":"10.1016\/j.cub.2009.12.014"},{"key":"bibr3-00187208231218196","doi-asserted-by":"publisher","DOI":"10.1016\/j.bbi.2006.03.001"},{"key":"bibr4-00187208231218196","doi-asserted-by":"publisher","DOI":"10.2519\/jospt.2004.34.10.610"},{"key":"bibr5-00187208231218196","volume-title":"Muscles alive: Their functions revealed by electromyography","author":"Basmajian J. 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