The effects of knee angles on subjective discomfort ratings, heart rates, and muscle fatigue of lower extremities in static-sustaining tasks
The purpose of this study was to investigate the effects of knee-flexion angles on subjective discomfort ratings, heart rates, and muscle fatigue using median frequency (MDF) in a static-sustaining task. Thirty healthy participants maintained 13 postures including standing, squatting, sitting, and k...
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| Veröffentlicht in: | Applied ergonomics 2010-12, Vol.42 (1), p.184-192 |
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| creator | Jung, Myung-Chul Park, DongHyun Lee, Soo-Jin Lee, Kyung-Suk Kim, Dae-Min Kong, Yong-Ku |
| description | The purpose of this study was to investigate the effects of knee-flexion angles on subjective discomfort ratings, heart rates, and muscle fatigue using median frequency (MDF) in a static-sustaining task. Thirty healthy participants maintained 13 postures including standing, squatting, sitting, and kneeling postures and then MDFs from the erector spinae, biceps femoris, vastus medialis, gastrocnemius, and tibialis anterior muscles, subjective discomfort, and heart rates were collected every 3 min during a sustained 15 min task. Results showed that the discomfort, heart rate and muscle fatigue were significantly influenced by the body postures. In general, standing and sitting postures showed less discomfort as well as lower heart rates, whereas squatting postures (KF120, KF90, KF60) had higher discomfort and heart rates. Three MDF change trends were reported associated with postures in this study. First, there were less changes of MDFs for standing and sitting postures; second, all patterns of MDFs for KF 150 and KF120 decreased, and lastly some MDFs had increasing trends and others showed decreasing trends for KF30, KF30T, and kneeling postures. |
| doi_str_mv | 10.1016/j.apergo.2010.07.004 |
| format | Article |
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Thirty healthy participants maintained 13 postures including standing, squatting, sitting, and kneeling postures and then MDFs from the erector spinae, biceps femoris, vastus medialis, gastrocnemius, and tibialis anterior muscles, subjective discomfort, and heart rates were collected every 3 min during a sustained 15 min task. Results showed that the discomfort, heart rate and muscle fatigue were significantly influenced by the body postures. In general, standing and sitting postures showed less discomfort as well as lower heart rates, whereas squatting postures (KF120, KF90, KF60) had higher discomfort and heart rates. Three MDF change trends were reported associated with postures in this study. First, there were less changes of MDFs for standing and sitting postures; second, all patterns of MDFs for KF 150 and KF120 decreased, and lastly some MDFs had increasing trends and others showed decreasing trends for KF30, KF30T, and kneeling postures.</description><identifier>ISSN: 0003-6870</identifier><identifier>EISSN: 1872-9126</identifier><identifier>DOI: 10.1016/j.apergo.2010.07.004</identifier><identifier>PMID: 20723884</identifier><identifier>CODEN: AERGBW</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Adult ; Applied physiology ; Biological and medical sciences ; Biomechanical Phenomena ; Electromyography ; Ergonomics ; Ergonomics. Work place. Occupational physiology ; Fatigue ; Heart Rate ; Human physiology applied to population studies and life conditions. Human ecophysiology ; Humans ; Impact analysis ; Knee ; Knee angles ; Knee Joint - physiology ; Lower Extremity - physiology ; Male ; Median frequency ; Medical sciences ; Movement ; Muscle Fatigue - physiology ; Muscle, Skeletal - physiology ; Pain Measurement - methods ; Postural Balance - physiology ; Posture ; Studies ; Subjective discomfort rating ; Young Adult</subject><ispartof>Applied ergonomics, 2010-12, Vol.42 (1), p.184-192</ispartof><rights>2010 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2010 Elsevier Ltd. All rights reserved.</rights><rights>Copyright Elsevier Science Ltd. 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Thirty healthy participants maintained 13 postures including standing, squatting, sitting, and kneeling postures and then MDFs from the erector spinae, biceps femoris, vastus medialis, gastrocnemius, and tibialis anterior muscles, subjective discomfort, and heart rates were collected every 3 min during a sustained 15 min task. Results showed that the discomfort, heart rate and muscle fatigue were significantly influenced by the body postures. In general, standing and sitting postures showed less discomfort as well as lower heart rates, whereas squatting postures (KF120, KF90, KF60) had higher discomfort and heart rates. Three MDF change trends were reported associated with postures in this study. First, there were less changes of MDFs for standing and sitting postures; second, all patterns of MDFs for KF 150 and KF120 decreased, and lastly some MDFs had increasing trends and others showed decreasing trends for KF30, KF30T, and kneeling postures.</description><subject>Adult</subject><subject>Applied physiology</subject><subject>Biological and medical sciences</subject><subject>Biomechanical Phenomena</subject><subject>Electromyography</subject><subject>Ergonomics</subject><subject>Ergonomics. Work place. Occupational physiology</subject><subject>Fatigue</subject><subject>Heart Rate</subject><subject>Human physiology applied to population studies and life conditions. Human ecophysiology</subject><subject>Humans</subject><subject>Impact analysis</subject><subject>Knee</subject><subject>Knee angles</subject><subject>Knee Joint - physiology</subject><subject>Lower Extremity - physiology</subject><subject>Male</subject><subject>Median frequency</subject><subject>Medical sciences</subject><subject>Movement</subject><subject>Muscle Fatigue - physiology</subject><subject>Muscle, Skeletal - physiology</subject><subject>Pain Measurement - methods</subject><subject>Postural Balance - physiology</subject><subject>Posture</subject><subject>Studies</subject><subject>Subjective discomfort rating</subject><subject>Young Adult</subject><issn>0003-6870</issn><issn>1872-9126</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkcuKFDEUhoMoTjv6BiJBEDdWm2ulejMggzcYcDOuQyo56UlNXdqkatR38KE9TbUKLjSb5M_5zk9OfkKecrbljNevu607QN5PW8HwipktY-oe2fDGiGrHRX2fbBhjsqobw87Io1I6lI3i-iE5E8wI2TRqQ35c3wCFGMHPhU6R3o4A1I37HlCOtCxth6V0BzSk4qchTnmm2c1p3JdX9AbcKgGFGwMdluJ7oBGB_QJHw376CpnCtznDkOaEtgltZwR8VRY8pBG96OzKbXlMHkTXF3hy2s_J53dvry8_VFef3n-8fHNVeaXZXElety5KF4I2XDZC-ca1QtXRGNgF7WXrahEMwxogxpwKTLeyDZxr0NzIc_Jy9T3k6csCZbYDDgd970aYlmJ3WtXCyJ36L2l0jWsnBJLP_yK7ackjjmEbgWa8UTVCaoV8nkrJEO0hp8Hl75Yze0zVdnZN1R5TtcxYTBXbnp28l3aA8LvpV4wIvDgBrnjXx-xGn8ofTkrRSC2Ru1g5wN-9S5Bt8QlGDyFljNmGKf37JT8BwrPDdA</recordid><startdate>20101201</startdate><enddate>20101201</enddate><creator>Jung, Myung-Chul</creator><creator>Park, DongHyun</creator><creator>Lee, Soo-Jin</creator><creator>Lee, Kyung-Suk</creator><creator>Kim, Dae-Min</creator><creator>Kong, Yong-Ku</creator><general>Elsevier Ltd</general><general>Elsevier</general><general>Elsevier Science Ltd</general><scope>IQODW</scope><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>7T2</scope><scope>C1K</scope><scope>7X8</scope><scope>7U2</scope></search><sort><creationdate>20101201</creationdate><title>The effects of knee angles on subjective discomfort ratings, heart rates, and muscle fatigue of lower extremities in static-sustaining tasks</title><author>Jung, Myung-Chul ; Park, DongHyun ; Lee, Soo-Jin ; Lee, Kyung-Suk ; Kim, Dae-Min ; Kong, Yong-Ku</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c450t-316baf3add5713824c8ab246f77e9d5c3ba62d70138ef3a0a4d05b3bd115e5173</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Adult</topic><topic>Applied physiology</topic><topic>Biological and medical sciences</topic><topic>Biomechanical Phenomena</topic><topic>Electromyography</topic><topic>Ergonomics</topic><topic>Ergonomics. Work place. Occupational physiology</topic><topic>Fatigue</topic><topic>Heart Rate</topic><topic>Human physiology applied to population studies and life conditions. Human ecophysiology</topic><topic>Humans</topic><topic>Impact analysis</topic><topic>Knee</topic><topic>Knee angles</topic><topic>Knee Joint - physiology</topic><topic>Lower Extremity - physiology</topic><topic>Male</topic><topic>Median frequency</topic><topic>Medical sciences</topic><topic>Movement</topic><topic>Muscle Fatigue - physiology</topic><topic>Muscle, Skeletal - physiology</topic><topic>Pain Measurement - methods</topic><topic>Postural Balance - physiology</topic><topic>Posture</topic><topic>Studies</topic><topic>Subjective discomfort rating</topic><topic>Young Adult</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jung, Myung-Chul</creatorcontrib><creatorcontrib>Park, DongHyun</creatorcontrib><creatorcontrib>Lee, Soo-Jin</creatorcontrib><creatorcontrib>Lee, Kyung-Suk</creatorcontrib><creatorcontrib>Kim, Dae-Min</creatorcontrib><creatorcontrib>Kong, Yong-Ku</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Health and Safety Science Abstracts (Full archive)</collection><collection>Environmental Sciences and Pollution Management</collection><collection>MEDLINE - Academic</collection><collection>Safety Science and Risk</collection><jtitle>Applied ergonomics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Jung, Myung-Chul</au><au>Park, DongHyun</au><au>Lee, Soo-Jin</au><au>Lee, Kyung-Suk</au><au>Kim, Dae-Min</au><au>Kong, Yong-Ku</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effects of knee angles on subjective discomfort ratings, heart rates, and muscle fatigue of lower extremities in static-sustaining tasks</atitle><jtitle>Applied ergonomics</jtitle><addtitle>Appl Ergon</addtitle><date>2010-12-01</date><risdate>2010</risdate><volume>42</volume><issue>1</issue><spage>184</spage><epage>192</epage><pages>184-192</pages><issn>0003-6870</issn><eissn>1872-9126</eissn><coden>AERGBW</coden><abstract>The purpose of this study was to investigate the effects of knee-flexion angles on subjective discomfort ratings, heart rates, and muscle fatigue using median frequency (MDF) in a static-sustaining task. Thirty healthy participants maintained 13 postures including standing, squatting, sitting, and kneeling postures and then MDFs from the erector spinae, biceps femoris, vastus medialis, gastrocnemius, and tibialis anterior muscles, subjective discomfort, and heart rates were collected every 3 min during a sustained 15 min task. Results showed that the discomfort, heart rate and muscle fatigue were significantly influenced by the body postures. In general, standing and sitting postures showed less discomfort as well as lower heart rates, whereas squatting postures (KF120, KF90, KF60) had higher discomfort and heart rates. Three MDF change trends were reported associated with postures in this study. First, there were less changes of MDFs for standing and sitting postures; second, all patterns of MDFs for KF 150 and KF120 decreased, and lastly some MDFs had increasing trends and others showed decreasing trends for KF30, KF30T, and kneeling postures.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><pmid>20723884</pmid><doi>10.1016/j.apergo.2010.07.004</doi><tpages>9</tpages></addata></record> |
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| subjects | Adult Applied physiology Biological and medical sciences Biomechanical Phenomena Electromyography Ergonomics Ergonomics. Work place. Occupational physiology Fatigue Heart Rate Human physiology applied to population studies and life conditions. Human ecophysiology Humans Impact analysis Knee Knee angles Knee Joint - physiology Lower Extremity - physiology Male Median frequency Medical sciences Movement Muscle Fatigue - physiology Muscle, Skeletal - physiology Pain Measurement - methods Postural Balance - physiology Posture Studies Subjective discomfort rating Young Adult |
| title | The effects of knee angles on subjective discomfort ratings, heart rates, and muscle fatigue of lower extremities in static-sustaining tasks |
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