Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women
Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom Submitted 29 December 2008 ; accepted in final form 8 July 2009 The effect of elevated muscle temperature on mechanical efficiency was investigated during exercise at different pedal frequen...
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| container_title | Journal of applied physiology (1985) |
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| creator | Bell, Martin P Ferguson, Richard A |
| description | Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
Submitted 29 December 2008
; accepted in final form 8 July 2009
The effect of elevated muscle temperature on mechanical efficiency was investigated during exercise at different pedal frequencies in young and older women. Eight young (24 ± 3 yr) and eight older (70 ± 4 yr) women performed 6-min periods of cycling at 75% ventilatory threshold at pedal frequencies of 45, 60, 75, and 90 rpm under control and passively elevated local muscle temperature conditions. Mechanical efficiency was calculated from the ratio of energy turnover (pulmonary O 2 uptake) and mechanical power output. Overall, elevating muscle temperature increased ( P < 0.05) mechanical efficiency in young (32.0 ± 3.1 to 34.0 ± 5.5%) and decreased ( P < 0.05) efficiency in older women (30.2 ± 5.6 to 27.9 ± 4.1%). The different effect of elevated muscle temperature in young and older women reflects a shift in the efficiency-velocity relationship of skeletal muscle. These effects may be due to differences in recruitment patterns, as well as sarcopenic and fiber-type changes with age.
energy turnover; efficiency/velocity relationship; elderly; pedal frequency
Address for reprint requests and other correspondence: R. A. Ferguson, School of Sport and Exercise Sciences, Loughborough Univ., Leicestershire LE11 3TU, United Kingdom (e-mail: R.Ferguson{at}lboro.ac.uk ) |
| doi_str_mv | 10.1152/japplphysiol.91654.2008 |
| format | Article |
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Submitted 29 December 2008
; accepted in final form 8 July 2009
The effect of elevated muscle temperature on mechanical efficiency was investigated during exercise at different pedal frequencies in young and older women. Eight young (24 ± 3 yr) and eight older (70 ± 4 yr) women performed 6-min periods of cycling at 75% ventilatory threshold at pedal frequencies of 45, 60, 75, and 90 rpm under control and passively elevated local muscle temperature conditions. Mechanical efficiency was calculated from the ratio of energy turnover (pulmonary O 2 uptake) and mechanical power output. Overall, elevating muscle temperature increased ( P < 0.05) mechanical efficiency in young (32.0 ± 3.1 to 34.0 ± 5.5%) and decreased ( P < 0.05) efficiency in older women (30.2 ± 5.6 to 27.9 ± 4.1%). The different effect of elevated muscle temperature in young and older women reflects a shift in the efficiency-velocity relationship of skeletal muscle. These effects may be due to differences in recruitment patterns, as well as sarcopenic and fiber-type changes with age.
energy turnover; efficiency/velocity relationship; elderly; pedal frequency
Address for reprint requests and other correspondence: R. A. Ferguson, School of Sport and Exercise Sciences, Loughborough Univ., Leicestershire LE11 3TU, United Kingdom (e-mail: R.Ferguson{at}lboro.ac.uk )</description><identifier>ISSN: 8750-7587</identifier><identifier>EISSN: 1522-1601</identifier><identifier>DOI: 10.1152/japplphysiol.91654.2008</identifier><identifier>PMID: 19589952</identifier><identifier>CODEN: JAPHEV</identifier><language>eng</language><publisher>Bethesda, MD: Am Physiological Soc</publisher><subject>Adult ; Aged ; Aging - physiology ; Anaerobic Threshold - physiology ; Bicycling - physiology ; Biological and medical sciences ; Biomechanical Phenomena ; Body temperature ; Body Temperature - physiology ; Carbon Dioxide - blood ; Exercise ; Female ; Fundamental and applied biological sciences. Psychology ; Humans ; Muscle Contraction - physiology ; Muscle Fibers, Skeletal - physiology ; Muscle, Skeletal - cytology ; Muscle, Skeletal - metabolism ; Muscle, Skeletal - physiology ; Musculoskeletal system ; Myosin Heavy Chains - metabolism ; Older people ; Oxygen ; Oxygen Consumption - physiology ; Pulmonary Gas Exchange - physiology ; Women ; Young Adult ; Young adults</subject><ispartof>Journal of applied physiology (1985), 2009-09, Vol.107 (3), p.763-769</ispartof><rights>2009 INIST-CNRS</rights><rights>Copyright American Physiological Society Sep 2009</rights><rights>Copyright © 2009, American Physiological Society 2009</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c571t-11ae0f33a79af07f0050383c16511391ef3c1d80a7b2d66fd6924ca34f0692833</citedby><cites>FETCH-LOGICAL-c571t-11ae0f33a79af07f0050383c16511391ef3c1d80a7b2d66fd6924ca34f0692833</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,777,781,882,3026,27905,27906</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21859190$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19589952$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Bell, Martin P</creatorcontrib><creatorcontrib>Ferguson, Richard A</creatorcontrib><title>Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women</title><title>Journal of applied physiology (1985)</title><addtitle>J Appl Physiol (1985)</addtitle><description>Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
Submitted 29 December 2008
; accepted in final form 8 July 2009
The effect of elevated muscle temperature on mechanical efficiency was investigated during exercise at different pedal frequencies in young and older women. Eight young (24 ± 3 yr) and eight older (70 ± 4 yr) women performed 6-min periods of cycling at 75% ventilatory threshold at pedal frequencies of 45, 60, 75, and 90 rpm under control and passively elevated local muscle temperature conditions. Mechanical efficiency was calculated from the ratio of energy turnover (pulmonary O 2 uptake) and mechanical power output. Overall, elevating muscle temperature increased ( P < 0.05) mechanical efficiency in young (32.0 ± 3.1 to 34.0 ± 5.5%) and decreased ( P < 0.05) efficiency in older women (30.2 ± 5.6 to 27.9 ± 4.1%). The different effect of elevated muscle temperature in young and older women reflects a shift in the efficiency-velocity relationship of skeletal muscle. These effects may be due to differences in recruitment patterns, as well as sarcopenic and fiber-type changes with age.
energy turnover; efficiency/velocity relationship; elderly; pedal frequency
Address for reprint requests and other correspondence: R. A. Ferguson, School of Sport and Exercise Sciences, Loughborough Univ., Leicestershire LE11 3TU, United Kingdom (e-mail: R.Ferguson{at}lboro.ac.uk )</description><subject>Adult</subject><subject>Aged</subject><subject>Aging - physiology</subject><subject>Anaerobic Threshold - physiology</subject><subject>Bicycling - physiology</subject><subject>Biological and medical sciences</subject><subject>Biomechanical Phenomena</subject><subject>Body temperature</subject><subject>Body Temperature - physiology</subject><subject>Carbon Dioxide - blood</subject><subject>Exercise</subject><subject>Female</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Humans</subject><subject>Muscle Contraction - physiology</subject><subject>Muscle Fibers, Skeletal - physiology</subject><subject>Muscle, Skeletal - cytology</subject><subject>Muscle, Skeletal - metabolism</subject><subject>Muscle, Skeletal - physiology</subject><subject>Musculoskeletal system</subject><subject>Myosin Heavy Chains - metabolism</subject><subject>Older people</subject><subject>Oxygen</subject><subject>Oxygen Consumption - physiology</subject><subject>Pulmonary Gas Exchange - physiology</subject><subject>Women</subject><subject>Young Adult</subject><subject>Young adults</subject><issn>8750-7587</issn><issn>1522-1601</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkt-O1CAUxhujccfVV1BiovGmI9AC7Y2J2fhnk0280WvC0MMMEwoV2h37OL6p1Knr6hWE8zvnO4fzFcULgreEMPr2qIbBDYc52eC2LeGs3lKMmwfFJkdpSTgmD4tNIxguBWvERfEkpSPGpK4ZeVxckJY1bcvopvh57UeISo82eLSD8QTgUT8l7QCN0A85Nk4RkPId0sGPf9BbcEHbcUbKGNBjQj3og_JWK4fAGKsteD2jborW71EfuqUQlDar-bTk6Vm7JQQ_IGqbAFmP5jDll0UquJyATqEH_7R4ZJRL8Gw9L4tvHz98vfpc3nz5dH31_qbUTJCxJEQBNlWlRKsMFgZjhqum0vlvCKlaAibfuwYrsaMd56bjLa21qmqD862pqsvi3bnuMO166DQswzo5RNurOMugrPw34u1B7sOtpIJxjHku8HotEMP3CdIoe5s0OKc8hClJLjhpCBMZfPkfeAxT9Hk4SSklnNctzZA4QzqGlCKYu04IlosH5H0PyN8ekIsHcubz-4P8zVuXnoFXK6BS3peJyucN3HGUNKwlLc7cmzN3sPvDyUaQq1rYz4t67kTISgpeVb8ASp_SIg</recordid><startdate>20090901</startdate><enddate>20090901</enddate><creator>Bell, Martin P</creator><creator>Ferguson, Richard A</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><scope>5PM</scope></search><sort><creationdate>20090901</creationdate><title>Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women</title><author>Bell, Martin P ; Ferguson, Richard A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c571t-11ae0f33a79af07f0050383c16511391ef3c1d80a7b2d66fd6924ca34f0692833</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Adult</topic><topic>Aged</topic><topic>Aging - physiology</topic><topic>Anaerobic Threshold - physiology</topic><topic>Bicycling - physiology</topic><topic>Biological and medical sciences</topic><topic>Biomechanical Phenomena</topic><topic>Body temperature</topic><topic>Body Temperature - physiology</topic><topic>Carbon Dioxide - blood</topic><topic>Exercise</topic><topic>Female</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Humans</topic><topic>Muscle Contraction - physiology</topic><topic>Muscle Fibers, Skeletal - physiology</topic><topic>Muscle, Skeletal - cytology</topic><topic>Muscle, Skeletal - metabolism</topic><topic>Muscle, Skeletal - physiology</topic><topic>Musculoskeletal system</topic><topic>Myosin Heavy Chains - metabolism</topic><topic>Older people</topic><topic>Oxygen</topic><topic>Oxygen Consumption - physiology</topic><topic>Pulmonary Gas Exchange - physiology</topic><topic>Women</topic><topic>Young Adult</topic><topic>Young adults</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bell, Martin P</creatorcontrib><creatorcontrib>Ferguson, Richard A</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><collection>PubMed Central (Full Participant titles)</collection><jtitle>Journal of applied physiology (1985)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bell, Martin P</au><au>Ferguson, Richard A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women</atitle><jtitle>Journal of applied physiology (1985)</jtitle><addtitle>J Appl Physiol (1985)</addtitle><date>2009-09-01</date><risdate>2009</risdate><volume>107</volume><issue>3</issue><spage>763</spage><epage>769</epage><pages>763-769</pages><issn>8750-7587</issn><eissn>1522-1601</eissn><coden>JAPHEV</coden><abstract>Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
Submitted 29 December 2008
; accepted in final form 8 July 2009
The effect of elevated muscle temperature on mechanical efficiency was investigated during exercise at different pedal frequencies in young and older women. Eight young (24 ± 3 yr) and eight older (70 ± 4 yr) women performed 6-min periods of cycling at 75% ventilatory threshold at pedal frequencies of 45, 60, 75, and 90 rpm under control and passively elevated local muscle temperature conditions. Mechanical efficiency was calculated from the ratio of energy turnover (pulmonary O 2 uptake) and mechanical power output. Overall, elevating muscle temperature increased ( P < 0.05) mechanical efficiency in young (32.0 ± 3.1 to 34.0 ± 5.5%) and decreased ( P < 0.05) efficiency in older women (30.2 ± 5.6 to 27.9 ± 4.1%). The different effect of elevated muscle temperature in young and older women reflects a shift in the efficiency-velocity relationship of skeletal muscle. These effects may be due to differences in recruitment patterns, as well as sarcopenic and fiber-type changes with age.
energy turnover; efficiency/velocity relationship; elderly; pedal frequency
Address for reprint requests and other correspondence: R. A. Ferguson, School of Sport and Exercise Sciences, Loughborough Univ., Leicestershire LE11 3TU, United Kingdom (e-mail: R.Ferguson{at}lboro.ac.uk )</abstract><cop>Bethesda, MD</cop><pub>Am Physiological Soc</pub><pmid>19589952</pmid><doi>10.1152/japplphysiol.91654.2008</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| source | MEDLINE; American Physiological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Adult Aged Aging - physiology Anaerobic Threshold - physiology Bicycling - physiology Biological and medical sciences Biomechanical Phenomena Body temperature Body Temperature - physiology Carbon Dioxide - blood Exercise Female Fundamental and applied biological sciences. Psychology Humans Muscle Contraction - physiology Muscle Fibers, Skeletal - physiology Muscle, Skeletal - cytology Muscle, Skeletal - metabolism Muscle, Skeletal - physiology Musculoskeletal system Myosin Heavy Chains - metabolism Older people Oxygen Oxygen Consumption - physiology Pulmonary Gas Exchange - physiology Women Young Adult Young adults |
| title | Interaction between muscle temperature and contraction velocity affects mechanical efficiency during moderate-intensity cycling exercise in young and older women |
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