Exogenous carbohydrate oxidation rates are elevated after combined ingestion of glucose and fructose during exercise in the heat
1 Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston; and 2 Birmingham Womens Health Care National Healthcare Service Trust, Birmingham Womens Hospital, Birmingham, United Kingdom Submitted 21 March 2005 ; accepted in final form 19 October 2005 T...
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| Veröffentlicht in: | Journal of applied physiology (1985) 2006-03, Vol.100 (3), p.807-816 |
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| creator | Jentjens, Roy L. P. G Underwood, Katie Achten, Juul Currell, Kevin Mann, Christopher H Jeukendrup, Asker E |
| description | 1 Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston; and 2 Birmingham Womens Health Care National Healthcare Service Trust, Birmingham Womens Hospital, Birmingham, United Kingdom
Submitted 21 March 2005
; accepted in final form 19 October 2005
The first purpose of this study was to investigate whether a glucose (GLU) + fructose (FRUC) beverage would result in a higher exogenous carbohydrate (CHO) oxidation rate and a higher fluid availability during exercise in the heat compared with an isoenergetic GLU beverage. A second aim of the study was to examine whether ingestion of GLU at a rate of 1.5 g/min during exercise in the heat would lead to a reduced muscle glycogen oxidation rate compared with ingestion of water (WAT). Eight trained male cyclists (maximal oxygen uptake: 64 ± 1 ml·kg 1 ·min 1 ) cycled on three different occasions for 120 min at 50% maximum power output at an ambient temperature of 31.9 ± 0.1°C. Subjects received, in random order, a solution providing either 1.5 g/min of GLU, 1.0 g/min of GLU + 0.5 g/min of FRUC, or WAT. Exogenous CHO oxidation during the last hour of exercise was 36% higher ( P < 0.05) in GLU+FRUC compared with GLU, and peak oxidation rates were 1.14 ± 0.05 and 0.77 ± 0.08 g/min, respectively. Endogenous CHO oxidation was significantly lower ( P < 0.05) in GLU+FRUC compared with WAT. Muscle glycogen oxidation was not different after ingestion of GLU or WAT. Plasma deuterium enrichments were significantly higher ( P < 0.05) in WAT and GLU+FRUC compared with GLU. Furthermore, at 60 and 75 min of exercise, plasma deuterium enrichments were higher ( P < 0.05) in WAT compared with GLU+FRUC. Ingestion of GLU+FRUC during exercise in the heat resulted in higher exogenous CHO oxidation rates and fluid availability compared with ingestion of GLU and reduced endogenous CHO oxidation compared with ingestion of WAT.
substrate utilization; glycogen; fluid balance; hydration; stable isotopes
Address for reprint requests and other correspondence: A. E. Jeukendrup, School of Sport and Exercise Sciences, Univ. of Birmingham, Edgbaston, B15 2TT, Birmingham, UK (e-mail: a.e.jeukendrup{at}bham.ac.uk ) |
| doi_str_mv | 10.1152/japplphysiol.00322.2005 |
| format | Article |
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Submitted 21 March 2005
; accepted in final form 19 October 2005
The first purpose of this study was to investigate whether a glucose (GLU) + fructose (FRUC) beverage would result in a higher exogenous carbohydrate (CHO) oxidation rate and a higher fluid availability during exercise in the heat compared with an isoenergetic GLU beverage. A second aim of the study was to examine whether ingestion of GLU at a rate of 1.5 g/min during exercise in the heat would lead to a reduced muscle glycogen oxidation rate compared with ingestion of water (WAT). Eight trained male cyclists (maximal oxygen uptake: 64 ± 1 ml·kg 1 ·min 1 ) cycled on three different occasions for 120 min at 50% maximum power output at an ambient temperature of 31.9 ± 0.1°C. Subjects received, in random order, a solution providing either 1.5 g/min of GLU, 1.0 g/min of GLU + 0.5 g/min of FRUC, or WAT. Exogenous CHO oxidation during the last hour of exercise was 36% higher ( P < 0.05) in GLU+FRUC compared with GLU, and peak oxidation rates were 1.14 ± 0.05 and 0.77 ± 0.08 g/min, respectively. Endogenous CHO oxidation was significantly lower ( P < 0.05) in GLU+FRUC compared with WAT. Muscle glycogen oxidation was not different after ingestion of GLU or WAT. Plasma deuterium enrichments were significantly higher ( P < 0.05) in WAT and GLU+FRUC compared with GLU. Furthermore, at 60 and 75 min of exercise, plasma deuterium enrichments were higher ( P < 0.05) in WAT compared with GLU+FRUC. Ingestion of GLU+FRUC during exercise in the heat resulted in higher exogenous CHO oxidation rates and fluid availability compared with ingestion of GLU and reduced endogenous CHO oxidation compared with ingestion of WAT.
substrate utilization; glycogen; fluid balance; hydration; stable isotopes
Address for reprint requests and other correspondence: A. E. Jeukendrup, School of Sport and Exercise Sciences, Univ. of Birmingham, Edgbaston, B15 2TT, Birmingham, UK (e-mail: a.e.jeukendrup{at}bham.ac.uk )</description><identifier>ISSN: 8750-7587</identifier><identifier>EISSN: 1522-1601</identifier><identifier>DOI: 10.1152/japplphysiol.00322.2005</identifier><identifier>PMID: 16282436</identifier><identifier>CODEN: JAPHEV</identifier><language>eng</language><publisher>Bethesda, MD: Am Physiological Soc</publisher><subject>Adult ; Beverages ; Biological and medical sciences ; Blood Glucose - analysis ; Body Temperature - physiology ; Carbohydrates ; Carbon Dioxide - metabolism ; Deuterium - blood ; Dietary Carbohydrates - administration & dosage ; Dietary Carbohydrates - metabolism ; Drinking - physiology ; Drinking water ; Exercise ; Exercise - physiology ; Fats - metabolism ; Fructose - administration & dosage ; Fructose - metabolism ; Fundamental and applied biological sciences. Psychology ; Glucose ; Glucose - administration & dosage ; Glucose - metabolism ; Glycogen - metabolism ; Heat ; Hot Temperature ; Humans ; Lactates - blood ; Male ; Muscle, Skeletal - metabolism ; Osmolar Concentration ; Oxidation ; Oxidation-Reduction ; Pulmonary Ventilation - physiology ; Respiration ; Time Factors ; Water-Electrolyte Balance</subject><ispartof>Journal of applied physiology (1985), 2006-03, Vol.100 (3), p.807-816</ispartof><rights>2006 INIST-CNRS</rights><rights>Copyright American Physiological Society Mar 2006</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c477t-f4c2e846669a451b976ad26f80d3ed849947eb234ef1a0b2ada41890cb2722973</citedby><cites>FETCH-LOGICAL-c477t-f4c2e846669a451b976ad26f80d3ed849947eb234ef1a0b2ada41890cb2722973</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,782,786,3043,27933,27934</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=17600012$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/16282436$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Jentjens, Roy L. P. G</creatorcontrib><creatorcontrib>Underwood, Katie</creatorcontrib><creatorcontrib>Achten, Juul</creatorcontrib><creatorcontrib>Currell, Kevin</creatorcontrib><creatorcontrib>Mann, Christopher H</creatorcontrib><creatorcontrib>Jeukendrup, Asker E</creatorcontrib><title>Exogenous carbohydrate oxidation rates are elevated after combined ingestion of glucose and fructose during exercise in the heat</title><title>Journal of applied physiology (1985)</title><addtitle>J Appl Physiol (1985)</addtitle><description>1 Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston; and 2 Birmingham Womens Health Care National Healthcare Service Trust, Birmingham Womens Hospital, Birmingham, United Kingdom
Submitted 21 March 2005
; accepted in final form 19 October 2005
The first purpose of this study was to investigate whether a glucose (GLU) + fructose (FRUC) beverage would result in a higher exogenous carbohydrate (CHO) oxidation rate and a higher fluid availability during exercise in the heat compared with an isoenergetic GLU beverage. A second aim of the study was to examine whether ingestion of GLU at a rate of 1.5 g/min during exercise in the heat would lead to a reduced muscle glycogen oxidation rate compared with ingestion of water (WAT). Eight trained male cyclists (maximal oxygen uptake: 64 ± 1 ml·kg 1 ·min 1 ) cycled on three different occasions for 120 min at 50% maximum power output at an ambient temperature of 31.9 ± 0.1°C. Subjects received, in random order, a solution providing either 1.5 g/min of GLU, 1.0 g/min of GLU + 0.5 g/min of FRUC, or WAT. Exogenous CHO oxidation during the last hour of exercise was 36% higher ( P < 0.05) in GLU+FRUC compared with GLU, and peak oxidation rates were 1.14 ± 0.05 and 0.77 ± 0.08 g/min, respectively. Endogenous CHO oxidation was significantly lower ( P < 0.05) in GLU+FRUC compared with WAT. Muscle glycogen oxidation was not different after ingestion of GLU or WAT. Plasma deuterium enrichments were significantly higher ( P < 0.05) in WAT and GLU+FRUC compared with GLU. Furthermore, at 60 and 75 min of exercise, plasma deuterium enrichments were higher ( P < 0.05) in WAT compared with GLU+FRUC. Ingestion of GLU+FRUC during exercise in the heat resulted in higher exogenous CHO oxidation rates and fluid availability compared with ingestion of GLU and reduced endogenous CHO oxidation compared with ingestion of WAT.
substrate utilization; glycogen; fluid balance; hydration; stable isotopes
Address for reprint requests and other correspondence: A. E. Jeukendrup, School of Sport and Exercise Sciences, Univ. of Birmingham, Edgbaston, B15 2TT, Birmingham, UK (e-mail: a.e.jeukendrup{at}bham.ac.uk )</description><subject>Adult</subject><subject>Beverages</subject><subject>Biological and medical sciences</subject><subject>Blood Glucose - analysis</subject><subject>Body Temperature - physiology</subject><subject>Carbohydrates</subject><subject>Carbon Dioxide - metabolism</subject><subject>Deuterium - blood</subject><subject>Dietary Carbohydrates - administration & dosage</subject><subject>Dietary Carbohydrates - metabolism</subject><subject>Drinking - physiology</subject><subject>Drinking water</subject><subject>Exercise</subject><subject>Exercise - physiology</subject><subject>Fats - metabolism</subject><subject>Fructose - administration & dosage</subject><subject>Fructose - metabolism</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Glucose</subject><subject>Glucose - administration & dosage</subject><subject>Glucose - metabolism</subject><subject>Glycogen - metabolism</subject><subject>Heat</subject><subject>Hot Temperature</subject><subject>Humans</subject><subject>Lactates - blood</subject><subject>Male</subject><subject>Muscle, Skeletal - metabolism</subject><subject>Osmolar Concentration</subject><subject>Oxidation</subject><subject>Oxidation-Reduction</subject><subject>Pulmonary Ventilation - physiology</subject><subject>Respiration</subject><subject>Time Factors</subject><subject>Water-Electrolyte Balance</subject><issn>8750-7587</issn><issn>1522-1601</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkU-L1DAYxoso7rj6FTQIipeOSZom7VGWXRUWvKznkCZvphkyTU1anbn50U13iiuCeAoP-T3vv6coXhG8JaSm7_dqHP3Yn5ILfotxRemWYlw_Kjb5l5aEY_K42DSixqWoG3FRPEtpjzFhrCZPiwvCaUNZxTfFz-tj2MEQ5oS0il3oTyaqCVA4OqMmFwa0yIRUBAQevmdhkLITRKTDoXNDlm7YQbpng0U7P-uQAKnBIBtnPS3CzDFDCI4QtcvaDWjqAfWgpufFE6t8ghfre1l8vbm-u_pU3n75-Pnqw22pmRBTaZmm0DDOeavyDl0ruDKU2wabCkzD2pYJ6GjFwBKFO6qMYqRpse6ooLQV1WXx9lx3jOHbnOeVB5c0eK8GyNtLLng-CP0_SARuGSUL-PovcB_mOOQlJKWUcFJjkiFxhnQMKUWwcozuoOJJEiyXKOWfUcr7KOUSZXa-XMvP3QHMg2_NLgNvVkAlrbyNasjHfeAExzlxmjl25nq363-4CHLtFnYneTN7fwfHaRmDYCwr2WAhR2Oz7d2_bZmWv_HqF4qJzb4</recordid><startdate>20060301</startdate><enddate>20060301</enddate><creator>Jentjens, Roy L. P. G</creator><creator>Underwood, Katie</creator><creator>Achten, Juul</creator><creator>Currell, Kevin</creator><creator>Mann, Christopher H</creator><creator>Jeukendrup, Asker E</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>20060301</creationdate><title>Exogenous carbohydrate oxidation rates are elevated after combined ingestion of glucose and fructose during exercise in the heat</title><author>Jentjens, Roy L. P. G ; Underwood, Katie ; Achten, Juul ; Currell, Kevin ; Mann, Christopher H ; Jeukendrup, Asker E</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c477t-f4c2e846669a451b976ad26f80d3ed849947eb234ef1a0b2ada41890cb2722973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Adult</topic><topic>Beverages</topic><topic>Biological and medical sciences</topic><topic>Blood Glucose - analysis</topic><topic>Body Temperature - physiology</topic><topic>Carbohydrates</topic><topic>Carbon Dioxide - metabolism</topic><topic>Deuterium - blood</topic><topic>Dietary Carbohydrates - administration & dosage</topic><topic>Dietary Carbohydrates - metabolism</topic><topic>Drinking - physiology</topic><topic>Drinking water</topic><topic>Exercise</topic><topic>Exercise - physiology</topic><topic>Fats - metabolism</topic><topic>Fructose - administration & dosage</topic><topic>Fructose - metabolism</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Glucose</topic><topic>Glucose - administration & dosage</topic><topic>Glucose - metabolism</topic><topic>Glycogen - metabolism</topic><topic>Heat</topic><topic>Hot Temperature</topic><topic>Humans</topic><topic>Lactates - blood</topic><topic>Male</topic><topic>Muscle, Skeletal - metabolism</topic><topic>Osmolar Concentration</topic><topic>Oxidation</topic><topic>Oxidation-Reduction</topic><topic>Pulmonary Ventilation - physiology</topic><topic>Respiration</topic><topic>Time Factors</topic><topic>Water-Electrolyte Balance</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jentjens, Roy L. P. G</creatorcontrib><creatorcontrib>Underwood, Katie</creatorcontrib><creatorcontrib>Achten, Juul</creatorcontrib><creatorcontrib>Currell, Kevin</creatorcontrib><creatorcontrib>Mann, Christopher H</creatorcontrib><creatorcontrib>Jeukendrup, Asker E</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>Jentjens, Roy L. P. G</au><au>Underwood, Katie</au><au>Achten, Juul</au><au>Currell, Kevin</au><au>Mann, Christopher H</au><au>Jeukendrup, Asker E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exogenous carbohydrate oxidation rates are elevated after combined ingestion of glucose and fructose during exercise in the heat</atitle><jtitle>Journal of applied physiology (1985)</jtitle><addtitle>J Appl Physiol (1985)</addtitle><date>2006-03-01</date><risdate>2006</risdate><volume>100</volume><issue>3</issue><spage>807</spage><epage>816</epage><pages>807-816</pages><issn>8750-7587</issn><eissn>1522-1601</eissn><coden>JAPHEV</coden><abstract>1 Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston; and 2 Birmingham Womens Health Care National Healthcare Service Trust, Birmingham Womens Hospital, Birmingham, United Kingdom
Submitted 21 March 2005
; accepted in final form 19 October 2005
The first purpose of this study was to investigate whether a glucose (GLU) + fructose (FRUC) beverage would result in a higher exogenous carbohydrate (CHO) oxidation rate and a higher fluid availability during exercise in the heat compared with an isoenergetic GLU beverage. A second aim of the study was to examine whether ingestion of GLU at a rate of 1.5 g/min during exercise in the heat would lead to a reduced muscle glycogen oxidation rate compared with ingestion of water (WAT). Eight trained male cyclists (maximal oxygen uptake: 64 ± 1 ml·kg 1 ·min 1 ) cycled on three different occasions for 120 min at 50% maximum power output at an ambient temperature of 31.9 ± 0.1°C. Subjects received, in random order, a solution providing either 1.5 g/min of GLU, 1.0 g/min of GLU + 0.5 g/min of FRUC, or WAT. Exogenous CHO oxidation during the last hour of exercise was 36% higher ( P < 0.05) in GLU+FRUC compared with GLU, and peak oxidation rates were 1.14 ± 0.05 and 0.77 ± 0.08 g/min, respectively. Endogenous CHO oxidation was significantly lower ( P < 0.05) in GLU+FRUC compared with WAT. Muscle glycogen oxidation was not different after ingestion of GLU or WAT. Plasma deuterium enrichments were significantly higher ( P < 0.05) in WAT and GLU+FRUC compared with GLU. Furthermore, at 60 and 75 min of exercise, plasma deuterium enrichments were higher ( P < 0.05) in WAT compared with GLU+FRUC. Ingestion of GLU+FRUC during exercise in the heat resulted in higher exogenous CHO oxidation rates and fluid availability compared with ingestion of GLU and reduced endogenous CHO oxidation compared with ingestion of WAT.
substrate utilization; glycogen; fluid balance; hydration; stable isotopes
Address for reprint requests and other correspondence: A. E. Jeukendrup, School of Sport and Exercise Sciences, Univ. of Birmingham, Edgbaston, B15 2TT, Birmingham, UK (e-mail: a.e.jeukendrup{at}bham.ac.uk )</abstract><cop>Bethesda, MD</cop><pub>Am Physiological Soc</pub><pmid>16282436</pmid><doi>10.1152/japplphysiol.00322.2005</doi><tpages>10</tpages></addata></record> |
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| source | MEDLINE; American Physiological Society; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Adult Beverages Biological and medical sciences Blood Glucose - analysis Body Temperature - physiology Carbohydrates Carbon Dioxide - metabolism Deuterium - blood Dietary Carbohydrates - administration & dosage Dietary Carbohydrates - metabolism Drinking - physiology Drinking water Exercise Exercise - physiology Fats - metabolism Fructose - administration & dosage Fructose - metabolism Fundamental and applied biological sciences. Psychology Glucose Glucose - administration & dosage Glucose - metabolism Glycogen - metabolism Heat Hot Temperature Humans Lactates - blood Male Muscle, Skeletal - metabolism Osmolar Concentration Oxidation Oxidation-Reduction Pulmonary Ventilation - physiology Respiration Time Factors Water-Electrolyte Balance |
| title | Exogenous carbohydrate oxidation rates are elevated after combined ingestion of glucose and fructose during exercise in the heat |
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