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Garcia, Maria-Gabriela; Wall, Rudolf; Steinhilber, Benjamin; Läubli, Thomas; Martin, Bernard J.

Long-Lasting Changes in Muscle Twitch Force During Simulated Work While Standing or Walking

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  • Media type: E-Article
  • Title: Long-Lasting Changes in Muscle Twitch Force During Simulated Work While Standing or Walking
  • Contributor: Garcia, Maria-Gabriela; Wall, Rudolf; Steinhilber, Benjamin; Läubli, Thomas; Martin, Bernard J.
  • imprint: SAGE Publications, 2016
  • Published in: Human Factors: The Journal of the Human Factors and Ergonomics Society
  • Language: English
  • DOI: 10.1177/0018720816669444
  • ISSN: 0018-7208; 1547-8181
  • Origination:
  • Footnote:
  • Description: <jats:sec><jats:title>Objective:</jats:title><jats:p>The aim of this study was to evaluate the long-lasting effects of prolonged standing work on a hard floor or floor mat and slow-pace walking on muscle twitch force (MTF) elicited by electrical stimulation.</jats:p></jats:sec><jats:sec><jats:title>Background:</jats:title><jats:p>Prolonged standing work may alter lower-leg muscle function, which can be quantified by changes in the MTF amplitude and duration related to muscle fatigue. Ergonomic interventions have been proposed to mitigate fatigue and discomfort; however, their influences remain controversial.</jats:p></jats:sec><jats:sec><jats:title>Method:</jats:title><jats:p>Ten men and eight women simulated standing work in 320-min experiments with three conditions: standing on a hard floor or an antifatigue mat and walking on a treadmill, each including three seated rest breaks. MTF in the gastrocnemius-soleus muscles was evaluated through changes in signal amplitude and duration.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>The significant decrease of MTF amplitude and an increase of duration after standing work on a hard floor and on a mat persisted beyond 1 hr postwork. During walking, significant MTF metrics changes appeared 30 min postwork. MTF amplitude decrease was not significant after the first 110 min in any of the conditions; however, MTF duration was significantly higher than baseline in the standing conditions.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>Similar long-lasting weakening of MTF was induced by standing on a hard floor and on an antifatigue mat. However, walking partially attenuated this phenomenon.</jats:p></jats:sec><jats:sec><jats:title>Application:</jats:title><jats:p>Mostly static standing is likely to contribute to alterations of MTF in lower-leg muscles and potentially to musculoskeletal disorders regardless of the flooring characteristics. Occupational activities including slow-pace walking may reduce such deterioration in muscle function.</jats:p></jats:sec>