Development and evaluation of a soft wearable weight support device for reducing muscle fatigue on shoulder
Compensating the weight of human limbs is important in reducing muscle fatigue experienced by manual laborers. In this study, a compact and lightweight soft wearable weight support device was developed and evaluated. The device supports gravitational force on the shoulder at any arm posture, althoug...
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| description | Compensating the weight of human limbs is important in reducing muscle fatigue experienced by manual laborers. In this study, a compact and lightweight soft wearable weight support device was developed and evaluated. The device supports gravitational force on the shoulder at any arm posture, although there are some limitations in its assistive performance. The device actuator consists of a cam-rod structure, a tendon-driven mechanism, and a rubber band. The desired assistive torque is translated to the shoulder joint along a tendon routing structure. Device performance was evaluated by measuring muscle activation in with-assist and without-assist conditions. Muscle activation on the deltoid was measured by surface electromyography. An experimental protocol consisting of a series of exercises was executed with six healthy subjects. The subjects raised and lowered their arm from 0 to 100 degrees for 30 times under eight conditions, which were combined with-assist and without-assist conditions, and holding the horizontal angle of the arm at 0, 30, 60, or 90 degrees against the sagittal plane. Surface electromyography data were pre-processed and analyzed using a root mean square method. When muscle fatigue occurs, the root mean square of the surface electromyography increases nonlinearly. This was calculated using the standard deviation of the root mean square. Three of six subjects showed decreased variation of the root mean square between the exercises in the with-assist condition. One subject's result was significantly reduced (by about 57.6%) in the with-assist condition. In contrast, two subjects did not show significant difference between measurements taken in the with-assist and without-assist conditions. One subject was dropped from the experiment because the device did not fit the subject's body. In conclusion, the effectiveness of the soft wearable weight support device in supporting shoulder movements was verified through the decreased variation of muscle activation. |
| doi_str_mv | 10.1371/journal.pone.0173730 |
| format | Article |
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In this study, a compact and lightweight soft wearable weight support device was developed and evaluated. The device supports gravitational force on the shoulder at any arm posture, although there are some limitations in its assistive performance. The device actuator consists of a cam-rod structure, a tendon-driven mechanism, and a rubber band. The desired assistive torque is translated to the shoulder joint along a tendon routing structure. Device performance was evaluated by measuring muscle activation in with-assist and without-assist conditions. Muscle activation on the deltoid was measured by surface electromyography. An experimental protocol consisting of a series of exercises was executed with six healthy subjects. The subjects raised and lowered their arm from 0 to 100 degrees for 30 times under eight conditions, which were combined with-assist and without-assist conditions, and holding the horizontal angle of the arm at 0, 30, 60, or 90 degrees against the sagittal plane. Surface electromyography data were pre-processed and analyzed using a root mean square method. When muscle fatigue occurs, the root mean square of the surface electromyography increases nonlinearly. This was calculated using the standard deviation of the root mean square. Three of six subjects showed decreased variation of the root mean square between the exercises in the with-assist condition. One subject's result was significantly reduced (by about 57.6%) in the with-assist condition. In contrast, two subjects did not show significant difference between measurements taken in the with-assist and without-assist conditions. One subject was dropped from the experiment because the device did not fit the subject's body. In conclusion, the effectiveness of the soft wearable weight support device in supporting shoulder movements was verified through the decreased variation of muscle activation.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0173730</identifier><identifier>PMID: 28291825</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Activation ; Activities of daily living ; Actuators ; Aerospace engineering ; Analysis ; Arm ; Biology and Life Sciences ; Biomechanical Phenomena ; Data processing ; Electromyography ; Fatigue ; Gravitation ; Gravity ; Health aspects ; Human mechanics ; Humans ; International conferences ; Life expectancy ; Manual workers ; Mean square values ; Medicine and Health Sciences ; Muscle contraction ; Muscle fatigue ; Muscle Fatigue - physiology ; Muscles ; Muscular fatigue ; Musculoskeletal system ; Physical Sciences ; Physiological aspects ; Posture ; Prevention ; Rehabilitation ; Robotics ; Robots ; Routing ; Rubber ; Shoulder ; Shoulder - physiology ; Wearable technology ; Weight reduction ; Weight-Bearing ; Workers</subject><ispartof>PloS one, 2017-03, Vol.12 (3), p.e0173730-e0173730</ispartof><rights>COPYRIGHT 2017 Public Library of Science</rights><rights>2017 Park, Cho. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2017 Park, Cho 2017 Park, Cho</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c791t-ed9334828e7c0a7d37f214f79cf3b80c069f20138bb356523f86c32c2ffcbfc83</citedby><cites>FETCH-LOGICAL-c791t-ed9334828e7c0a7d37f214f79cf3b80c069f20138bb356523f86c32c2ffcbfc83</cites><orcidid>0000-0001-6586-4238</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5349681/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5349681/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,864,885,2102,2928,23866,27924,27925,53791,53793,79600,79601</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/28291825$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><contributor>Zhang, Dingguo</contributor><creatorcontrib>Park, Daegeun</creatorcontrib><creatorcontrib>Cho, Kyu-Jin</creatorcontrib><title>Development and evaluation of a soft wearable weight support device for reducing muscle fatigue on shoulder</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>Compensating the weight of human limbs is important in reducing muscle fatigue experienced by manual laborers. In this study, a compact and lightweight soft wearable weight support device was developed and evaluated. The device supports gravitational force on the shoulder at any arm posture, although there are some limitations in its assistive performance. The device actuator consists of a cam-rod structure, a tendon-driven mechanism, and a rubber band. The desired assistive torque is translated to the shoulder joint along a tendon routing structure. Device performance was evaluated by measuring muscle activation in with-assist and without-assist conditions. Muscle activation on the deltoid was measured by surface electromyography. An experimental protocol consisting of a series of exercises was executed with six healthy subjects. The subjects raised and lowered their arm from 0 to 100 degrees for 30 times under eight conditions, which were combined with-assist and without-assist conditions, and holding the horizontal angle of the arm at 0, 30, 60, or 90 degrees against the sagittal plane. Surface electromyography data were pre-processed and analyzed using a root mean square method. When muscle fatigue occurs, the root mean square of the surface electromyography increases nonlinearly. This was calculated using the standard deviation of the root mean square. Three of six subjects showed decreased variation of the root mean square between the exercises in the with-assist condition. One subject's result was significantly reduced (by about 57.6%) in the with-assist condition. In contrast, two subjects did not show significant difference between measurements taken in the with-assist and without-assist conditions. One subject was dropped from the experiment because the device did not fit the subject's body. In conclusion, the effectiveness of the soft wearable weight support device in supporting shoulder movements was verified through the decreased variation of muscle activation.</description><subject>Activation</subject><subject>Activities of daily living</subject><subject>Actuators</subject><subject>Aerospace engineering</subject><subject>Analysis</subject><subject>Arm</subject><subject>Biology and Life Sciences</subject><subject>Biomechanical Phenomena</subject><subject>Data processing</subject><subject>Electromyography</subject><subject>Fatigue</subject><subject>Gravitation</subject><subject>Gravity</subject><subject>Health aspects</subject><subject>Human mechanics</subject><subject>Humans</subject><subject>International conferences</subject><subject>Life expectancy</subject><subject>Manual workers</subject><subject>Mean square values</subject><subject>Medicine and Health Sciences</subject><subject>Muscle contraction</subject><subject>Muscle fatigue</subject><subject>Muscle Fatigue - physiology</subject><subject>Muscles</subject><subject>Muscular fatigue</subject><subject>Musculoskeletal system</subject><subject>Physical Sciences</subject><subject>Physiological aspects</subject><subject>Posture</subject><subject>Prevention</subject><subject>Rehabilitation</subject><subject>Robotics</subject><subject>Robots</subject><subject>Routing</subject><subject>Rubber</subject><subject>Shoulder</subject><subject>Shoulder - physiology</subject><subject>Wearable technology</subject><subject>Weight reduction</subject><subject>Weight-Bearing</subject><subject>Workers</subject><issn>1932-6203</issn><issn>1932-6203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>DOA</sourceid><recordid>eNqNk12L1DAUhoso7jr6D0QLgujFjEnTfPRGWNavgYUFv25Dmp50uqZNTdpR_72p012mshdLLhJOnvfNyUlOkjzFaIMJx2-u3Og7ZTe962CDMCecoHvJKS5ItmYZIveP1ifJoxCuEKJEMPYwOclEVmCR0dPkxzvYg3V9C92Qqq5KYa_sqIbGdakzqUqDM0P6C5RXpYW4aOrdkIax750f0gr2jYbUOJ96qEbddHXajkFH0kSPeoQ0-oSdG20F_nHywCgb4Mk8r5JvH95_Pf-0vrj8uD0_u1hrXuBhDVVBSC4yAVwjxSvCTYZzwwttSCmQRqwwGcJElCWhjGbECKZJpjNjdGm0IKvk-cG3ty7IuU5BYsE5KTCN0lWyPRCVU1ey902r_B_pVCP_BZyvpfJDE-8hdY4ZpYXmuhQ501wpTgnCGoNgGMPk9XY-bSxbqHQspFd2Ybrc6ZqdrN1eUpIXTEwGr2YD736OEAbZNkGDtaoDN055C8wZzbPiDijngjLEaERf_IfeXoiZqlW8a9MZF1PUk6k8ywWNCSJGIrW5hYqjgrbR8f-ZJsYXgtcLQWQG-D3UagxBbr98vjt7-X3Jvjxid6DssAvOjtN3DUswP4DauxA8mJv3wEhO7XNdDTm1j5zbJ8qeHb_ljei6X8hfga0VFA</recordid><startdate>20170314</startdate><enddate>20170314</enddate><creator>Park, Daegeun</creator><creator>Cho, Kyu-Jin</creator><general>Public Library of Science</general><general>Public Library of Science (PLoS)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>IOV</scope><scope>ISR</scope><scope>3V.</scope><scope>7QG</scope><scope>7QL</scope><scope>7QO</scope><scope>7RV</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TG</scope><scope>7TM</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB.</scope><scope>KB0</scope><scope>KL.</scope><scope>L6V</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>M7S</scope><scope>NAPCQ</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PATMY</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0001-6586-4238</orcidid></search><sort><creationdate>20170314</creationdate><title>Development and evaluation of a soft wearable weight support device for reducing muscle fatigue on shoulder</title><author>Park, Daegeun ; Cho, Kyu-Jin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c791t-ed9334828e7c0a7d37f214f79cf3b80c069f20138bb356523f86c32c2ffcbfc83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Activation</topic><topic>Activities of daily living</topic><topic>Actuators</topic><topic>Aerospace engineering</topic><topic>Analysis</topic><topic>Arm</topic><topic>Biology and Life Sciences</topic><topic>Biomechanical Phenomena</topic><topic>Data processing</topic><topic>Electromyography</topic><topic>Fatigue</topic><topic>Gravitation</topic><topic>Gravity</topic><topic>Health aspects</topic><topic>Human mechanics</topic><topic>Humans</topic><topic>International conferences</topic><topic>Life expectancy</topic><topic>Manual workers</topic><topic>Mean square values</topic><topic>Medicine and Health Sciences</topic><topic>Muscle contraction</topic><topic>Muscle fatigue</topic><topic>Muscle Fatigue - physiology</topic><topic>Muscles</topic><topic>Muscular fatigue</topic><topic>Musculoskeletal system</topic><topic>Physical Sciences</topic><topic>Physiological aspects</topic><topic>Posture</topic><topic>Prevention</topic><topic>Rehabilitation</topic><topic>Robotics</topic><topic>Robots</topic><topic>Routing</topic><topic>Rubber</topic><topic>Shoulder</topic><topic>Shoulder - physiology</topic><topic>Wearable technology</topic><topic>Weight reduction</topic><topic>Weight-Bearing</topic><topic>Workers</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Park, Daegeun</creatorcontrib><creatorcontrib>Cho, Kyu-Jin</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Gale In Context: Opposing Viewpoints</collection><collection>Gale In Context: Science</collection><collection>ProQuest Central (Corporate)</collection><collection>Animal Behavior Abstracts</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Biotechnology Research Abstracts</collection><collection>Nursing & Allied Health Database</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Immunology Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Agricultural Science Collection</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>Public Health Database</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>Agricultural & Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>Engineering Research Database</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Materials Science Database</collection><collection>Nursing & Allied Health Database (Alumni Edition)</collection><collection>Meteorological & Geoastrophysical Abstracts - 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Park, Daegeun</au><au>Cho, Kyu-Jin</au><au>Zhang, Dingguo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Development and evaluation of a soft wearable weight support device for reducing muscle fatigue on shoulder</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2017-03-14</date><risdate>2017</risdate><volume>12</volume><issue>3</issue><spage>e0173730</spage><epage>e0173730</epage><pages>e0173730-e0173730</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Compensating the weight of human limbs is important in reducing muscle fatigue experienced by manual laborers. In this study, a compact and lightweight soft wearable weight support device was developed and evaluated. The device supports gravitational force on the shoulder at any arm posture, although there are some limitations in its assistive performance. The device actuator consists of a cam-rod structure, a tendon-driven mechanism, and a rubber band. The desired assistive torque is translated to the shoulder joint along a tendon routing structure. Device performance was evaluated by measuring muscle activation in with-assist and without-assist conditions. Muscle activation on the deltoid was measured by surface electromyography. An experimental protocol consisting of a series of exercises was executed with six healthy subjects. The subjects raised and lowered their arm from 0 to 100 degrees for 30 times under eight conditions, which were combined with-assist and without-assist conditions, and holding the horizontal angle of the arm at 0, 30, 60, or 90 degrees against the sagittal plane. Surface electromyography data were pre-processed and analyzed using a root mean square method. When muscle fatigue occurs, the root mean square of the surface electromyography increases nonlinearly. This was calculated using the standard deviation of the root mean square. Three of six subjects showed decreased variation of the root mean square between the exercises in the with-assist condition. One subject's result was significantly reduced (by about 57.6%) in the with-assist condition. In contrast, two subjects did not show significant difference between measurements taken in the with-assist and without-assist conditions. One subject was dropped from the experiment because the device did not fit the subject's body. In conclusion, the effectiveness of the soft wearable weight support device in supporting shoulder movements was verified through the decreased variation of muscle activation.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>28291825</pmid><doi>10.1371/journal.pone.0173730</doi><tpages>e0173730</tpages><orcidid>https://orcid.org/0000-0001-6586-4238</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Activation Activities of daily living Actuators Aerospace engineering Analysis Arm Biology and Life Sciences Biomechanical Phenomena Data processing Electromyography Fatigue Gravitation Gravity Health aspects Human mechanics Humans International conferences Life expectancy Manual workers Mean square values Medicine and Health Sciences Muscle contraction Muscle fatigue Muscle Fatigue - physiology Muscles Muscular fatigue Musculoskeletal system Physical Sciences Physiological aspects Posture Prevention Rehabilitation Robotics Robots Routing Rubber Shoulder Shoulder - physiology Wearable technology Weight reduction Weight-Bearing Workers |
| title | Development and evaluation of a soft wearable weight support device for reducing muscle fatigue on shoulder |
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