Changes in motor unit discharge rate are not associated with the amount of twitch potentiation in old men
1 Schools of Kinesiology and 3 Physical Therapy, and 2 Departments of Anatomy and Cell Biology, and 4 Physiology, The University of Western Ontario, London, Ontario, Canada N6G 1H1 This study examined, in nine old men (82 ± 4 yr), whether there is an association between the magnitude of change i...
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| Veröffentlicht in: | Journal of applied physiology (1985) 2002-11, Vol.93 (5), p.1616-1621 |
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| container_title | Journal of applied physiology (1985) |
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| creator | Klein, C. S Rice, C. L Ivanova, T. D Garland, S. J |
| description | 1 Schools of Kinesiology and
3 Physical Therapy, and 2 Departments of
Anatomy and Cell Biology, and 4 Physiology, The
University of Western Ontario, London, Ontario, Canada N6G
1H1
This study examined, in nine
old men (82 ± 4 yr), whether there is an association between the
magnitude of change in motor unit discharge rate and the amount of
twitch potentiation after a conditioning contraction (CC). The evoked
twitch force and motor unit discharge rate during isometric
ramp-and-hold contractions (10-18 s) of the triceps brachii muscle
at 10, 20, and 30% of the maximal voluntary contraction were
determined before and 10 s, 2 min, 6 min, and 11 min after a 5-s
CC at 75% maximal voluntary contraction. After the CC, there was a
potentiation of twitch force (approximately twofold), and the discharge
rate of the 47 sampled motor units declined ( P |
| doi_str_mv | 10.1152/japplphysiol.00414.2002 |
| format | Article |
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3 Physical Therapy, and 2 Departments of
Anatomy and Cell Biology, and 4 Physiology, The
University of Western Ontario, London, Ontario, Canada N6G
1H1
This study examined, in nine
old men (82 ± 4 yr), whether there is an association between the
magnitude of change in motor unit discharge rate and the amount of
twitch potentiation after a conditioning contraction (CC). The evoked
twitch force and motor unit discharge rate during isometric
ramp-and-hold contractions (10-18 s) of the triceps brachii muscle
at 10, 20, and 30% of the maximal voluntary contraction were
determined before and 10 s, 2 min, 6 min, and 11 min after a 5-s
CC at 75% maximal voluntary contraction. After the CC, there was a
potentiation of twitch force (approximately twofold), and the discharge
rate of the 47 sampled motor units declined ( P < 0.05)
an average of 1 Hz 10 s after the CC, compared with the control
condition. The CC had no effect on the variability (coefficient of
variation) of both force and discharge rate, as well as the
electromyographic activity recorded over the triceps brachii and biceps
brachii muscles. In contrast to our earlier study of young men (Klein
CS, Ivanova TD, Rice CL, and Garland SJ, Neurosci Lett 316:
153-156, 2001), the magnitude of the reduction in discharge rate after
the CC was not associated ( r = 0.06) with the amount of
twitch potentiation. These findings suggest an age-related alteration
in the neural strategy for adjusting motor output to a muscle after a CC.
motoneuron; rate coding; skeletal muscle; contractile properties; aging</description><identifier>ISSN: 8750-7587</identifier><identifier>EISSN: 1522-1601</identifier><identifier>DOI: 10.1152/japplphysiol.00414.2002</identifier><identifier>PMID: 12381745</identifier><identifier>CODEN: JAPHEV</identifier><language>eng</language><publisher>Bethesda, MD: Am Physiological Soc</publisher><subject>Aged ; Aged, 80 and over ; Aging ; Aging - physiology ; Biological and medical sciences ; Conditioning (Psychology) - physiology ; Electromyography ; Fundamental and applied biological sciences. Psychology ; Humans ; Male ; Men ; Motor ability ; Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration ; Motor Neurons - physiology ; Muscle Contraction - physiology ; Muscle, Skeletal - physiology ; Neurons ; Vertebrates: nervous system and sense organs</subject><ispartof>Journal of applied physiology (1985), 2002-11, Vol.93 (5), p.1616-1621</ispartof><rights>2003 INIST-CNRS</rights><rights>Copyright American Physiological Society Nov 2002</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c475t-8c3e2a3dcd345d334be484385659bd571d38bccec3ac7fb79b77cefb2ea9fcc33</citedby><cites>FETCH-LOGICAL-c475t-8c3e2a3dcd345d334be484385659bd571d38bccec3ac7fb79b77cefb2ea9fcc33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,3039,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=14353698$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12381745$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Klein, C. S</creatorcontrib><creatorcontrib>Rice, C. L</creatorcontrib><creatorcontrib>Ivanova, T. D</creatorcontrib><creatorcontrib>Garland, S. J</creatorcontrib><title>Changes in motor unit discharge rate are not associated with the amount of twitch potentiation in old men</title><title>Journal of applied physiology (1985)</title><addtitle>J Appl Physiol (1985)</addtitle><description>1 Schools of Kinesiology and
3 Physical Therapy, and 2 Departments of
Anatomy and Cell Biology, and 4 Physiology, The
University of Western Ontario, London, Ontario, Canada N6G
1H1
This study examined, in nine
old men (82 ± 4 yr), whether there is an association between the
magnitude of change in motor unit discharge rate and the amount of
twitch potentiation after a conditioning contraction (CC). The evoked
twitch force and motor unit discharge rate during isometric
ramp-and-hold contractions (10-18 s) of the triceps brachii muscle
at 10, 20, and 30% of the maximal voluntary contraction were
determined before and 10 s, 2 min, 6 min, and 11 min after a 5-s
CC at 75% maximal voluntary contraction. After the CC, there was a
potentiation of twitch force (approximately twofold), and the discharge
rate of the 47 sampled motor units declined ( P < 0.05)
an average of 1 Hz 10 s after the CC, compared with the control
condition. The CC had no effect on the variability (coefficient of
variation) of both force and discharge rate, as well as the
electromyographic activity recorded over the triceps brachii and biceps
brachii muscles. In contrast to our earlier study of young men (Klein
CS, Ivanova TD, Rice CL, and Garland SJ, Neurosci Lett 316:
153-156, 2001), the magnitude of the reduction in discharge rate after
the CC was not associated ( r = 0.06) with the amount of
twitch potentiation. These findings suggest an age-related alteration
in the neural strategy for adjusting motor output to a muscle after a CC.
motoneuron; rate coding; skeletal muscle; contractile properties; aging</description><subject>Aged</subject><subject>Aged, 80 and over</subject><subject>Aging</subject><subject>Aging - physiology</subject><subject>Biological and medical sciences</subject><subject>Conditioning (Psychology) - physiology</subject><subject>Electromyography</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Humans</subject><subject>Male</subject><subject>Men</subject><subject>Motor ability</subject><subject>Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration</subject><subject>Motor Neurons - physiology</subject><subject>Muscle Contraction - physiology</subject><subject>Muscle, Skeletal - physiology</subject><subject>Neurons</subject><subject>Vertebrates: nervous system and sense organs</subject><issn>8750-7587</issn><issn>1522-1601</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkV2L1DAYhYso7rj6FzQIijcd89mklzK4Kix4s16HNEmnGdqkJinr_HtTp7giiFeB933OSU5OVb1CcI8Qw-9Pap7HeTgnF8Y9hBTRPYYQP6p2ZYtr1ED0uNoJzmDNmeBX1bOUThAiShl6Wl0hTATilO0qdxiUP9oEnAdTyCGCxbsMjEt6UPFoQVTZAhUt8CEDlVLQrkwMuHd5AHkouyksPoPQg1xmegBzyNbnQrngV9swGjBZ_7x60qsx2RfbeV19u_l4d_hc33799OXw4bbWlLNcC00sVsRoQygzhNDOUkGJYA1rO8M4MkR0WltNlOZ9x9uOc237DlvV9loTcl29vfjOMXxfbMpyKmHsOCpvw5Ikx0g0qBH_BZHgrUANLeDrv8BTWKIvISTGGDGCMC8Qv0A6hpSi7eUc3aTiWSIo187kn53JX53JtbOifLnZL91kzYNuK6kAbzZAJa3GPiqvXXrgKGGkaddA9MIN7jjcu2jldls4nuXNMo539kden9ESySQqnyBn0xfZu3_LCi1_4-QndHHGNA</recordid><startdate>20021101</startdate><enddate>20021101</enddate><creator>Klein, C. S</creator><creator>Rice, C. L</creator><creator>Ivanova, T. D</creator><creator>Garland, S. J</creator><general>Am Physiological Soc</general><general>American Physiological Society</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>7QP</scope><scope>7QR</scope><scope>7TK</scope><scope>7TS</scope><scope>7U7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>20021101</creationdate><title>Changes in motor unit discharge rate are not associated with the amount of twitch potentiation in old men</title><author>Klein, C. S ; Rice, C. L ; Ivanova, T. D ; Garland, S. J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c475t-8c3e2a3dcd345d334be484385659bd571d38bccec3ac7fb79b77cefb2ea9fcc33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Aged</topic><topic>Aged, 80 and over</topic><topic>Aging</topic><topic>Aging - physiology</topic><topic>Biological and medical sciences</topic><topic>Conditioning (Psychology) - physiology</topic><topic>Electromyography</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Humans</topic><topic>Male</topic><topic>Men</topic><topic>Motor ability</topic><topic>Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration</topic><topic>Motor Neurons - physiology</topic><topic>Muscle Contraction - physiology</topic><topic>Muscle, Skeletal - physiology</topic><topic>Neurons</topic><topic>Vertebrates: nervous system and sense organs</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Klein, C. S</creatorcontrib><creatorcontrib>Rice, C. L</creatorcontrib><creatorcontrib>Ivanova, T. D</creatorcontrib><creatorcontrib>Garland, S. J</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>Calcium & Calcified Tissue Abstracts</collection><collection>Chemoreception Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>Physical Education Index</collection><collection>Toxicology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of applied physiology (1985)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Klein, C. S</au><au>Rice, C. L</au><au>Ivanova, T. D</au><au>Garland, S. J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Changes in motor unit discharge rate are not associated with the amount of twitch potentiation in old men</atitle><jtitle>Journal of applied physiology (1985)</jtitle><addtitle>J Appl Physiol (1985)</addtitle><date>2002-11-01</date><risdate>2002</risdate><volume>93</volume><issue>5</issue><spage>1616</spage><epage>1621</epage><pages>1616-1621</pages><issn>8750-7587</issn><eissn>1522-1601</eissn><coden>JAPHEV</coden><abstract>1 Schools of Kinesiology and
3 Physical Therapy, and 2 Departments of
Anatomy and Cell Biology, and 4 Physiology, The
University of Western Ontario, London, Ontario, Canada N6G
1H1
This study examined, in nine
old men (82 ± 4 yr), whether there is an association between the
magnitude of change in motor unit discharge rate and the amount of
twitch potentiation after a conditioning contraction (CC). The evoked
twitch force and motor unit discharge rate during isometric
ramp-and-hold contractions (10-18 s) of the triceps brachii muscle
at 10, 20, and 30% of the maximal voluntary contraction were
determined before and 10 s, 2 min, 6 min, and 11 min after a 5-s
CC at 75% maximal voluntary contraction. After the CC, there was a
potentiation of twitch force (approximately twofold), and the discharge
rate of the 47 sampled motor units declined ( P < 0.05)
an average of 1 Hz 10 s after the CC, compared with the control
condition. The CC had no effect on the variability (coefficient of
variation) of both force and discharge rate, as well as the
electromyographic activity recorded over the triceps brachii and biceps
brachii muscles. In contrast to our earlier study of young men (Klein
CS, Ivanova TD, Rice CL, and Garland SJ, Neurosci Lett 316:
153-156, 2001), the magnitude of the reduction in discharge rate after
the CC was not associated ( r = 0.06) with the amount of
twitch potentiation. These findings suggest an age-related alteration
in the neural strategy for adjusting motor output to a muscle after a CC.
motoneuron; rate coding; skeletal muscle; contractile properties; aging</abstract><cop>Bethesda, MD</cop><pub>Am Physiological Soc</pub><pmid>12381745</pmid><doi>10.1152/japplphysiol.00414.2002</doi><tpages>6</tpages></addata></record> |
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| identifier | ISSN: 8750-7587 |
| ispartof | Journal of applied physiology (1985), 2002-11, Vol.93 (5), p.1616-1621 |
| issn | 8750-7587 1522-1601 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_72186168 |
| source | MEDLINE; American Physiological Society Paid; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Aged Aged, 80 and over Aging Aging - physiology Biological and medical sciences Conditioning (Psychology) - physiology Electromyography Fundamental and applied biological sciences. Psychology Humans Male Men Motor ability Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration Motor Neurons - physiology Muscle Contraction - physiology Muscle, Skeletal - physiology Neurons Vertebrates: nervous system and sense organs |
| title | Changes in motor unit discharge rate are not associated with the amount of twitch potentiation in old men |
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