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The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing

We investigated whether physical requirements and motor variability decreased over days in novices during a repetitive screwing task. Fifty-seven subjects performed one hour of repetitive screwing and fastening on three days, separated by 2–7 days. The average physical requirement and relative cycle...

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Detalles Bibliográficos
Autores principales: Luger, Tessy, Seibt, Robert, Rieger, Monika A., Steinhilber, Benjamin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6479693/
https://www.ncbi.nlm.nih.gov/pubmed/30959882
http://dx.doi.org/10.3390/ijerph16071231
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author Luger, Tessy
Seibt, Robert
Rieger, Monika A.
Steinhilber, Benjamin
author_facet Luger, Tessy
Seibt, Robert
Rieger, Monika A.
Steinhilber, Benjamin
author_sort Luger, Tessy
collection PubMed
description We investigated whether physical requirements and motor variability decreased over days in novices during a repetitive screwing task. Fifty-seven subjects performed one hour of repetitive screwing and fastening on three days, separated by 2–7 days. The average physical requirement and relative cycle-to-cycle variability (coefficient of variation, i.e., CV) were calculated from continuous recordings of electromyography of four arm muscles (biceps brachii, triceps brachii, flexor carpi radialis, extensor digitorum), forearm acceleration, and electrocardiography. Muscle activity levels, heart rate, and forearm acceleration decreased from day 1 to day 2 (range: ~4% to ~20%) and/or 3 (range: ~4% to ~28%). Not all muscles showed a similar pattern. Activity of the extensor digitorum and biceps brachii decreased already between days 1 and 2 (range: ~6% to ~13%), whereas activity of the flexor carpi radialis and triceps brachii decreased between days 1 and 3 (range: ~13% to ~20%). No changes in physical requirement were detected between days 2 and 3. Relative motor variability did not change across days, except that variability of forearm acceleration increased from day 1 to 3 (~5%). This study found consistent changes in physical requirements and indicated that several arm muscles show earlier decreases of muscular activity, like the extensor digitorum, compared to other body parts, like the flexor carpi radialis. Moreover, movement strategies may develop differently than muscle activation strategies, based on the different developments of physical requirements and motor variability. The development of physical requirements in industrial tasks is part of daily living and starts at task onset, highlighting the importance of task familiarization and the randomization of experimental conditions in scientific studies.
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spelling pubmed-64796932019-04-29 The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing Luger, Tessy Seibt, Robert Rieger, Monika A. Steinhilber, Benjamin Int J Environ Res Public Health Article We investigated whether physical requirements and motor variability decreased over days in novices during a repetitive screwing task. Fifty-seven subjects performed one hour of repetitive screwing and fastening on three days, separated by 2–7 days. The average physical requirement and relative cycle-to-cycle variability (coefficient of variation, i.e., CV) were calculated from continuous recordings of electromyography of four arm muscles (biceps brachii, triceps brachii, flexor carpi radialis, extensor digitorum), forearm acceleration, and electrocardiography. Muscle activity levels, heart rate, and forearm acceleration decreased from day 1 to day 2 (range: ~4% to ~20%) and/or 3 (range: ~4% to ~28%). Not all muscles showed a similar pattern. Activity of the extensor digitorum and biceps brachii decreased already between days 1 and 2 (range: ~6% to ~13%), whereas activity of the flexor carpi radialis and triceps brachii decreased between days 1 and 3 (range: ~13% to ~20%). No changes in physical requirement were detected between days 2 and 3. Relative motor variability did not change across days, except that variability of forearm acceleration increased from day 1 to 3 (~5%). This study found consistent changes in physical requirements and indicated that several arm muscles show earlier decreases of muscular activity, like the extensor digitorum, compared to other body parts, like the flexor carpi radialis. Moreover, movement strategies may develop differently than muscle activation strategies, based on the different developments of physical requirements and motor variability. The development of physical requirements in industrial tasks is part of daily living and starts at task onset, highlighting the importance of task familiarization and the randomization of experimental conditions in scientific studies. MDPI 2019-04-06 2019-04 /pmc/articles/PMC6479693/ /pubmed/30959882 http://dx.doi.org/10.3390/ijerph16071231 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Luger, Tessy
Seibt, Robert
Rieger, Monika A.
Steinhilber, Benjamin
The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing
title The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing
title_full The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing
title_fullStr The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing
title_full_unstemmed The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing
title_short The Role of Motor Learning on Measures of Physical Requirements and Motor Variability During Repetitive Screwing
title_sort role of motor learning on measures of physical requirements and motor variability during repetitive screwing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6479693/
https://www.ncbi.nlm.nih.gov/pubmed/30959882
http://dx.doi.org/10.3390/ijerph16071231
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