Steadiness is reduced and motor unit discharge is more variable in old adults
The purpose of this study was to compare the steadiness and discharge rate of motor units during submaximal contractions performed by young and old adults. Subjects performed isometric and slow shortening and lengthening contractions with the first dorsal interosseous muscle. The steadiness of the i...
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| Veröffentlicht in: | Muscle & nerve 2000-04, Vol.23 (4), p.600-612 |
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| creator | Laidlaw, Douglass H. Bilodeau, Martin Enoka, Roger M. |
| description | The purpose of this study was to compare the steadiness and discharge rate of motor units during submaximal contractions performed by young and old adults. Subjects performed isometric and slow shortening and lengthening contractions with the first dorsal interosseous muscle. The steadiness of the isometric and slow anisometric contractions was less for the old subjects compared with young subjects, especially at the lower target forces and with the lightest loads. Furthermore, the steadiness of the lengthening contractions was less compared with the shortening contractions for the old subjects. Although the mean discharge rates of motor units were not different for the two groups of subjects, the variability of the discharge rates was greater for the old subjects during the isometric and anisometric contractions. We conclude that a more variable discharge by single motor units probably contributes to the reduced ability of old adults to perform steady muscle contractions. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 600–612, 2000. |
| doi_str_mv | 10.1002/(SICI)1097-4598(200004)23:4<600::AID-MUS20>3.0.CO;2-D |
| format | Article |
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Subjects performed isometric and slow shortening and lengthening contractions with the first dorsal interosseous muscle. The steadiness of the isometric and slow anisometric contractions was less for the old subjects compared with young subjects, especially at the lower target forces and with the lightest loads. Furthermore, the steadiness of the lengthening contractions was less compared with the shortening contractions for the old subjects. Although the mean discharge rates of motor units were not different for the two groups of subjects, the variability of the discharge rates was greater for the old subjects during the isometric and anisometric contractions. We conclude that a more variable discharge by single motor units probably contributes to the reduced ability of old adults to perform steady muscle contractions. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 600–612, 2000.</description><identifier>ISSN: 0148-639X</identifier><identifier>EISSN: 1097-4598</identifier><identifier>DOI: 10.1002/(SICI)1097-4598(200004)23:4<600::AID-MUS20>3.0.CO;2-D</identifier><identifier>PMID: 10716772</identifier><identifier>CODEN: MUNEDE</identifier><language>eng</language><publisher>New York: John Wiley & Sons, Inc</publisher><subject>Adult ; Aged ; Aged, 80 and over ; aging ; Aging - physiology ; Biological and medical sciences ; Electromyography ; Female ; finger movement ; first dorsal interosseous ; Fundamental and applied biological sciences. Psychology ; Hand - innervation ; Humans ; Isometric Contraction - physiology ; Male ; Middle Aged ; Motor Activity - physiology ; Motor Neurons - physiology ; motor unit ; Muscle Contraction - physiology ; Muscle Development ; Muscle, Skeletal - growth & development ; Muscle, Skeletal - innervation ; Muscle, Skeletal - physiology ; Striated muscle. Tendons ; Vertebrates: osteoarticular system, musculoskeletal system</subject><ispartof>Muscle & nerve, 2000-04, Vol.23 (4), p.600-612</ispartof><rights>Copyright © 2000 John Wiley & Sons, Inc.</rights><rights>2000 INIST-CNRS</rights><rights>Copyright 2000 John Wiley & Sons, Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c4120-ff822703c928167eb21ed4bc27ab6b7e7021fbfa5406e38ba93930686a356303</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F%28SICI%291097-4598%28200004%2923%3A4%3C600%3A%3AAID-MUS20%3E3.0.CO%3B2-D$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F%28SICI%291097-4598%28200004%2923%3A4%3C600%3A%3AAID-MUS20%3E3.0.CO%3B2-D$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1406904$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/10716772$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Laidlaw, Douglass H.</creatorcontrib><creatorcontrib>Bilodeau, Martin</creatorcontrib><creatorcontrib>Enoka, Roger M.</creatorcontrib><title>Steadiness is reduced and motor unit discharge is more variable in old adults</title><title>Muscle & nerve</title><addtitle>Muscle Nerve</addtitle><description>The purpose of this study was to compare the steadiness and discharge rate of motor units during submaximal contractions performed by young and old adults. Subjects performed isometric and slow shortening and lengthening contractions with the first dorsal interosseous muscle. The steadiness of the isometric and slow anisometric contractions was less for the old subjects compared with young subjects, especially at the lower target forces and with the lightest loads. Furthermore, the steadiness of the lengthening contractions was less compared with the shortening contractions for the old subjects. Although the mean discharge rates of motor units were not different for the two groups of subjects, the variability of the discharge rates was greater for the old subjects during the isometric and anisometric contractions. We conclude that a more variable discharge by single motor units probably contributes to the reduced ability of old adults to perform steady muscle contractions. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 600–612, 2000.</description><subject>Adult</subject><subject>Aged</subject><subject>Aged, 80 and over</subject><subject>aging</subject><subject>Aging - physiology</subject><subject>Biological and medical sciences</subject><subject>Electromyography</subject><subject>Female</subject><subject>finger movement</subject><subject>first dorsal interosseous</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Hand - innervation</subject><subject>Humans</subject><subject>Isometric Contraction - physiology</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Motor Activity - physiology</subject><subject>Motor Neurons - physiology</subject><subject>motor unit</subject><subject>Muscle Contraction - physiology</subject><subject>Muscle Development</subject><subject>Muscle, Skeletal - growth & development</subject><subject>Muscle, Skeletal - innervation</subject><subject>Muscle, Skeletal - physiology</subject><subject>Striated muscle. Tendons</subject><subject>Vertebrates: osteoarticular system, musculoskeletal system</subject><issn>0148-639X</issn><issn>1097-4598</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkF1r1EAUhgdR7Lb6FyQXIu1F1jMfmUlWLdSsbhdbF9xWvTtMkkmN5qPOJGr_vROzVEHBuRk4POflPQ8hLyjMKQB7erhdp-sjCokKRZTEhwz8E0eML8RzCbBYnKyX4fnllsExn8M83Txj4fIOmd1u3CUzoCIOJU8-7pF95z77ABpLdZ_sUVBUKsVm5HzbG11UrXEuqFxgTTHkpgh0WwRN13c2GNqqD4rK5Z-0vTIj03TWBN-0rXRW-0EbdLVfKIa6dw_IvVLXzjzc_Qfk4vWri_Q0PNus1unJWZgLyiAsy5gxBTxPWOx7mIxRU4gsZ0pnMlNGAaNlVupIgDQ8znTCEw4ylppHkgM_IE-m2GvbfR2M67HxBU1d69Z0g0MFiZRMKA9eTmBuO-esKfHaVo22N0gBR82Io2YcpeEoDSfNyDgK9JoRvWb8pRk5AqYbZLj0uY92BYasMcUfqZNXDzzeAdrlui6tbvPK_eb8YQkIj72fsO9VbW7-Kvefbv-qNg18cDgFV643P26Dtf2CUnEV4Ye3KzxV7-ibVaTwJf8JmRGygA</recordid><startdate>200004</startdate><enddate>200004</enddate><creator>Laidlaw, Douglass H.</creator><creator>Bilodeau, Martin</creator><creator>Enoka, Roger M.</creator><general>John Wiley & Sons, Inc</general><general>Wiley</general><scope>BSCLL</scope><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>7X8</scope></search><sort><creationdate>200004</creationdate><title>Steadiness is reduced and motor unit discharge is more variable in old adults</title><author>Laidlaw, Douglass H. ; Bilodeau, Martin ; Enoka, Roger M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4120-ff822703c928167eb21ed4bc27ab6b7e7021fbfa5406e38ba93930686a356303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Adult</topic><topic>Aged</topic><topic>Aged, 80 and over</topic><topic>aging</topic><topic>Aging - physiology</topic><topic>Biological and medical sciences</topic><topic>Electromyography</topic><topic>Female</topic><topic>finger movement</topic><topic>first dorsal interosseous</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Hand - innervation</topic><topic>Humans</topic><topic>Isometric Contraction - physiology</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Motor Activity - physiology</topic><topic>Motor Neurons - physiology</topic><topic>motor unit</topic><topic>Muscle Contraction - physiology</topic><topic>Muscle Development</topic><topic>Muscle, Skeletal - growth & development</topic><topic>Muscle, Skeletal - innervation</topic><topic>Muscle, Skeletal - physiology</topic><topic>Striated muscle. Tendons</topic><topic>Vertebrates: osteoarticular system, musculoskeletal system</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Laidlaw, Douglass H.</creatorcontrib><creatorcontrib>Bilodeau, Martin</creatorcontrib><creatorcontrib>Enoka, Roger M.</creatorcontrib><collection>Istex</collection><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>MEDLINE - Academic</collection><jtitle>Muscle & nerve</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Laidlaw, Douglass H.</au><au>Bilodeau, Martin</au><au>Enoka, Roger M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Steadiness is reduced and motor unit discharge is more variable in old adults</atitle><jtitle>Muscle & nerve</jtitle><addtitle>Muscle Nerve</addtitle><date>2000-04</date><risdate>2000</risdate><volume>23</volume><issue>4</issue><spage>600</spage><epage>612</epage><pages>600-612</pages><issn>0148-639X</issn><eissn>1097-4598</eissn><coden>MUNEDE</coden><abstract>The purpose of this study was to compare the steadiness and discharge rate of motor units during submaximal contractions performed by young and old adults. Subjects performed isometric and slow shortening and lengthening contractions with the first dorsal interosseous muscle. The steadiness of the isometric and slow anisometric contractions was less for the old subjects compared with young subjects, especially at the lower target forces and with the lightest loads. Furthermore, the steadiness of the lengthening contractions was less compared with the shortening contractions for the old subjects. Although the mean discharge rates of motor units were not different for the two groups of subjects, the variability of the discharge rates was greater for the old subjects during the isometric and anisometric contractions. We conclude that a more variable discharge by single motor units probably contributes to the reduced ability of old adults to perform steady muscle contractions. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 600–612, 2000.</abstract><cop>New York</cop><pub>John Wiley & Sons, Inc</pub><pmid>10716772</pmid><doi>10.1002/(SICI)1097-4598(200004)23:4<600::AID-MUS20>3.0.CO;2-D</doi><tpages>13</tpages></addata></record> |
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| ispartof | Muscle & nerve, 2000-04, Vol.23 (4), p.600-612 |
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| source | MEDLINE; Wiley Online Library Journals Frontfile Complete |
| subjects | Adult Aged Aged, 80 and over aging Aging - physiology Biological and medical sciences Electromyography Female finger movement first dorsal interosseous Fundamental and applied biological sciences. Psychology Hand - innervation Humans Isometric Contraction - physiology Male Middle Aged Motor Activity - physiology Motor Neurons - physiology motor unit Muscle Contraction - physiology Muscle Development Muscle, Skeletal - growth & development Muscle, Skeletal - innervation Muscle, Skeletal - physiology Striated muscle. Tendons Vertebrates: osteoarticular system, musculoskeletal system |
| title | Steadiness is reduced and motor unit discharge is more variable in old adults |
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