Low vs. High Glycemic Index Carbohydrate Gel Ingestion During Simulated 64-km Cycling Time Trial Performance
Earnest, C.P., S. Lancaster, C. Rasmussen, C. Kerksick, A. Lucia, M. Greenwood, A. Almada, P. Cowan, and R. Kreider. Low vs. high glycemic index carbohydrate gel ingestion during simulated 64-km cycling time trial performance. J. Strength Cond. Res. 18(3):466–472. 2004.—We examined the effect of low...
Gespeichert in:
| Veröffentlicht in: | Journal of strength and conditioning research 2004-08, Vol.18 (3), p.466-472 |
|---|---|
| Hauptverfasser: | , , , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 472 |
|---|---|
| container_issue | 3 |
| container_start_page | 466 |
| container_title | Journal of strength and conditioning research |
| container_volume | 18 |
| creator | Earnest, Conrad P Lancaster, Stacy L Rasmussen, Christopher J Kerksick, Chad M Lucia, Alejandro Greenwood, Michael C Almada, Anthony L Cowan, Patty A Kreider, Richard B |
| description | Earnest, C.P., S. Lancaster, C. Rasmussen, C. Kerksick, A. Lucia, M. Greenwood, A. Almada, P. Cowan, and R. Kreider. Low vs. high glycemic index carbohydrate gel ingestion during simulated 64-km cycling time trial performance. J. Strength Cond. Res. 18(3):466–472. 2004.—We examined the effect of low and high glycemic index (GI) carbohydrate (CHO) feedings during a simulated 64-km cycling time trial (TT) in nine subjects ([mean ± SEM], age = 30 ± 1 years; weight = 77.0 ± 2.6 kg). Each rider completed three randomized, double blind, counterbalanced, crossover rides, where riders ingested 15 g of low GI (honey; GI = 35) and high GI (dextrose; GI = 100) CHO every 16 km. Our results showed no differences between groups for the time to complete the entire TT (honey = 128 minutes, 42 seconds ± 3.6 minutes; dextrose = 128 minutes, 18 seconds ± 3.8 minutes; placebo = 131 minutes, 18 seconds ± 3.9 minutes). However, an analysis of total time alone may not portray an accurate picture of TT performance under CHO-supplemented conditions. For example, when the CHO data were collapsed, the CHO condition (128 minutes, 30 seconds) proved faster than placebo condition (131 minutes, 18 seconds; p < 0.02). Furthermore, examining the percent differences and 95% confidence intervals (CI) shows the two CHO conditions to be generally faster, as the majority of the CI lies in the positive rangeplacebo vs. dextrose (2.36% [95% CI; -0.69, 4.64]) and honey (1.98% [95% CI; -0.30, 5.02]). Dextrose vs. honey was 0.39% (95% CI; -3.39, 4.15). Within treatment analysis also showed that subjects generated more watts (W) over the last 16 km vs. preceding segments for dextrose (p < 0.002) and honey (p < 0.0004) treatments. When the final 16-km W was expressed as a percentage of pretest maximal W, the dextrose treatment was greater than placebo (p < 0.05). A strong trend was noted for the honey condition (p < 0.06), despite no differences in heart rate (HR) or rate of perceived exertion (RPE). Our results show a trend for improvement in time and wattage over the last 16 km of a 64-km simulated TT regardless of glycemic index. |
| doi_str_mv | 10.1519/00124278-200408000-00013 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_66805830</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>66805830</sourcerecordid><originalsourceid>FETCH-LOGICAL-c3383-5d7076a786fca4184b9fb2fbe703aba9f62471bcbedaa831524abd7ebe4ae5613</originalsourceid><addsrcrecordid>eNp1kUuP0zAQgC0EYh_wF5BP3LKMX7F7RAW6K1UCiXK2bGfSmnWSxW4o_fd4aVlOHCxbM9889JkQyuCGKbZ4B8C45No0HECCAYCmHiaekUumhGgkN_p5fUMrGwOMXZCrUr4DcKWUeEkuKsSh1fKSpPV0oD_LDb2N2x1dpWPAIQZ6N3b4iy5d9tPu2GW3R7rCVMNbLPs4jfTDnOO4pV_jMKea7WiddD_Q5TGkx_gmDkg3ObpEv2Dupzy4MeAr8qJ3qeDr831Nvn36uFneNuvPq7vl-3UThDCiUZ0G3Tpt2j44yYz0i97z3qMG4bxb9C2XmvngsXPOCKa4dL7T6FE6VC0T1-Ttqe9Dnn7MdWM7xBIwJTfiNBfbtgaUEVBBcwJDnkrJ2NuHHAeXj5aBfTRt_5q2T6btH9O19M15xuwH7P4VntVWQJ6Aw5T2mMt9mg-Y7Q5d2u_s_35Q_AZs0ojV</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>66805830</pqid></control><display><type>article</type><title>Low vs. High Glycemic Index Carbohydrate Gel Ingestion During Simulated 64-km Cycling Time Trial Performance</title><source>MEDLINE</source><source>Journals@Ovid Complete</source><creator>Earnest, Conrad P ; Lancaster, Stacy L ; Rasmussen, Christopher J ; Kerksick, Chad M ; Lucia, Alejandro ; Greenwood, Michael C ; Almada, Anthony L ; Cowan, Patty A ; Kreider, Richard B</creator><creatorcontrib>Earnest, Conrad P ; Lancaster, Stacy L ; Rasmussen, Christopher J ; Kerksick, Chad M ; Lucia, Alejandro ; Greenwood, Michael C ; Almada, Anthony L ; Cowan, Patty A ; Kreider, Richard B</creatorcontrib><description>Earnest, C.P., S. Lancaster, C. Rasmussen, C. Kerksick, A. Lucia, M. Greenwood, A. Almada, P. Cowan, and R. Kreider. Low vs. high glycemic index carbohydrate gel ingestion during simulated 64-km cycling time trial performance. J. Strength Cond. Res. 18(3):466–472. 2004.—We examined the effect of low and high glycemic index (GI) carbohydrate (CHO) feedings during a simulated 64-km cycling time trial (TT) in nine subjects ([mean ± SEM], age = 30 ± 1 years; weight = 77.0 ± 2.6 kg). Each rider completed three randomized, double blind, counterbalanced, crossover rides, where riders ingested 15 g of low GI (honey; GI = 35) and high GI (dextrose; GI = 100) CHO every 16 km. Our results showed no differences between groups for the time to complete the entire TT (honey = 128 minutes, 42 seconds ± 3.6 minutes; dextrose = 128 minutes, 18 seconds ± 3.8 minutes; placebo = 131 minutes, 18 seconds ± 3.9 minutes). However, an analysis of total time alone may not portray an accurate picture of TT performance under CHO-supplemented conditions. For example, when the CHO data were collapsed, the CHO condition (128 minutes, 30 seconds) proved faster than placebo condition (131 minutes, 18 seconds; p < 0.02). Furthermore, examining the percent differences and 95% confidence intervals (CI) shows the two CHO conditions to be generally faster, as the majority of the CI lies in the positive rangeplacebo vs. dextrose (2.36% [95% CI; -0.69, 4.64]) and honey (1.98% [95% CI; -0.30, 5.02]). Dextrose vs. honey was 0.39% (95% CI; -3.39, 4.15). Within treatment analysis also showed that subjects generated more watts (W) over the last 16 km vs. preceding segments for dextrose (p < 0.002) and honey (p < 0.0004) treatments. When the final 16-km W was expressed as a percentage of pretest maximal W, the dextrose treatment was greater than placebo (p < 0.05). A strong trend was noted for the honey condition (p < 0.06), despite no differences in heart rate (HR) or rate of perceived exertion (RPE). Our results show a trend for improvement in time and wattage over the last 16 km of a 64-km simulated TT regardless of glycemic index.</description><identifier>ISSN: 1064-8011</identifier><identifier>EISSN: 1533-4287</identifier><identifier>DOI: 10.1519/00124278-200408000-00013</identifier><identifier>PMID: 15320674</identifier><language>eng</language><publisher>United States: Copyright by the National Strength & Conditioning Association</publisher><subject>Adult ; Bicycling - physiology ; Blood Glucose - analysis ; Cross-Over Studies ; Dietary Carbohydrates - pharmacology ; Double-Blind Method ; Exercise - physiology ; Gels ; Glucose - pharmacology ; Glycemic Index ; Heart Rate - drug effects ; Heart Rate - physiology ; Honey ; Humans ; Male ; Physical Endurance - drug effects ; Physical Endurance - physiology ; Task Performance and Analysis ; Time Factors</subject><ispartof>Journal of strength and conditioning research, 2004-08, Vol.18 (3), p.466-472</ispartof><rights>Copyright © 2004 by the National Strength & Conditioning Association.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3383-5d7076a786fca4184b9fb2fbe703aba9f62471bcbedaa831524abd7ebe4ae5613</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/15320674$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Earnest, Conrad P</creatorcontrib><creatorcontrib>Lancaster, Stacy L</creatorcontrib><creatorcontrib>Rasmussen, Christopher J</creatorcontrib><creatorcontrib>Kerksick, Chad M</creatorcontrib><creatorcontrib>Lucia, Alejandro</creatorcontrib><creatorcontrib>Greenwood, Michael C</creatorcontrib><creatorcontrib>Almada, Anthony L</creatorcontrib><creatorcontrib>Cowan, Patty A</creatorcontrib><creatorcontrib>Kreider, Richard B</creatorcontrib><title>Low vs. High Glycemic Index Carbohydrate Gel Ingestion During Simulated 64-km Cycling Time Trial Performance</title><title>Journal of strength and conditioning research</title><addtitle>J Strength Cond Res</addtitle><description>Earnest, C.P., S. Lancaster, C. Rasmussen, C. Kerksick, A. Lucia, M. Greenwood, A. Almada, P. Cowan, and R. Kreider. Low vs. high glycemic index carbohydrate gel ingestion during simulated 64-km cycling time trial performance. J. Strength Cond. Res. 18(3):466–472. 2004.—We examined the effect of low and high glycemic index (GI) carbohydrate (CHO) feedings during a simulated 64-km cycling time trial (TT) in nine subjects ([mean ± SEM], age = 30 ± 1 years; weight = 77.0 ± 2.6 kg). Each rider completed three randomized, double blind, counterbalanced, crossover rides, where riders ingested 15 g of low GI (honey; GI = 35) and high GI (dextrose; GI = 100) CHO every 16 km. Our results showed no differences between groups for the time to complete the entire TT (honey = 128 minutes, 42 seconds ± 3.6 minutes; dextrose = 128 minutes, 18 seconds ± 3.8 minutes; placebo = 131 minutes, 18 seconds ± 3.9 minutes). However, an analysis of total time alone may not portray an accurate picture of TT performance under CHO-supplemented conditions. For example, when the CHO data were collapsed, the CHO condition (128 minutes, 30 seconds) proved faster than placebo condition (131 minutes, 18 seconds; p < 0.02). Furthermore, examining the percent differences and 95% confidence intervals (CI) shows the two CHO conditions to be generally faster, as the majority of the CI lies in the positive rangeplacebo vs. dextrose (2.36% [95% CI; -0.69, 4.64]) and honey (1.98% [95% CI; -0.30, 5.02]). Dextrose vs. honey was 0.39% (95% CI; -3.39, 4.15). Within treatment analysis also showed that subjects generated more watts (W) over the last 16 km vs. preceding segments for dextrose (p < 0.002) and honey (p < 0.0004) treatments. When the final 16-km W was expressed as a percentage of pretest maximal W, the dextrose treatment was greater than placebo (p < 0.05). A strong trend was noted for the honey condition (p < 0.06), despite no differences in heart rate (HR) or rate of perceived exertion (RPE). Our results show a trend for improvement in time and wattage over the last 16 km of a 64-km simulated TT regardless of glycemic index.</description><subject>Adult</subject><subject>Bicycling - physiology</subject><subject>Blood Glucose - analysis</subject><subject>Cross-Over Studies</subject><subject>Dietary Carbohydrates - pharmacology</subject><subject>Double-Blind Method</subject><subject>Exercise - physiology</subject><subject>Gels</subject><subject>Glucose - pharmacology</subject><subject>Glycemic Index</subject><subject>Heart Rate - drug effects</subject><subject>Heart Rate - physiology</subject><subject>Honey</subject><subject>Humans</subject><subject>Male</subject><subject>Physical Endurance - drug effects</subject><subject>Physical Endurance - physiology</subject><subject>Task Performance and Analysis</subject><subject>Time Factors</subject><issn>1064-8011</issn><issn>1533-4287</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp1kUuP0zAQgC0EYh_wF5BP3LKMX7F7RAW6K1UCiXK2bGfSmnWSxW4o_fd4aVlOHCxbM9889JkQyuCGKbZ4B8C45No0HECCAYCmHiaekUumhGgkN_p5fUMrGwOMXZCrUr4DcKWUeEkuKsSh1fKSpPV0oD_LDb2N2x1dpWPAIQZ6N3b4iy5d9tPu2GW3R7rCVMNbLPs4jfTDnOO4pV_jMKea7WiddD_Q5TGkx_gmDkg3ObpEv2Dupzy4MeAr8qJ3qeDr831Nvn36uFneNuvPq7vl-3UThDCiUZ0G3Tpt2j44yYz0i97z3qMG4bxb9C2XmvngsXPOCKa4dL7T6FE6VC0T1-Ttqe9Dnn7MdWM7xBIwJTfiNBfbtgaUEVBBcwJDnkrJ2NuHHAeXj5aBfTRt_5q2T6btH9O19M15xuwH7P4VntVWQJ6Aw5T2mMt9mg-Y7Q5d2u_s_35Q_AZs0ojV</recordid><startdate>200408</startdate><enddate>200408</enddate><creator>Earnest, Conrad P</creator><creator>Lancaster, Stacy L</creator><creator>Rasmussen, Christopher J</creator><creator>Kerksick, Chad M</creator><creator>Lucia, Alejandro</creator><creator>Greenwood, Michael C</creator><creator>Almada, Anthony L</creator><creator>Cowan, Patty A</creator><creator>Kreider, Richard B</creator><general>Copyright by the National Strength & Conditioning Association</general><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>200408</creationdate><title>Low vs. High Glycemic Index Carbohydrate Gel Ingestion During Simulated 64-km Cycling Time Trial Performance</title><author>Earnest, Conrad P ; Lancaster, Stacy L ; Rasmussen, Christopher J ; Kerksick, Chad M ; Lucia, Alejandro ; Greenwood, Michael C ; Almada, Anthony L ; Cowan, Patty A ; Kreider, Richard B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3383-5d7076a786fca4184b9fb2fbe703aba9f62471bcbedaa831524abd7ebe4ae5613</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>Adult</topic><topic>Bicycling - physiology</topic><topic>Blood Glucose - analysis</topic><topic>Cross-Over Studies</topic><topic>Dietary Carbohydrates - pharmacology</topic><topic>Double-Blind Method</topic><topic>Exercise - physiology</topic><topic>Gels</topic><topic>Glucose - pharmacology</topic><topic>Glycemic Index</topic><topic>Heart Rate - drug effects</topic><topic>Heart Rate - physiology</topic><topic>Honey</topic><topic>Humans</topic><topic>Male</topic><topic>Physical Endurance - drug effects</topic><topic>Physical Endurance - physiology</topic><topic>Task Performance and Analysis</topic><topic>Time Factors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Earnest, Conrad P</creatorcontrib><creatorcontrib>Lancaster, Stacy L</creatorcontrib><creatorcontrib>Rasmussen, Christopher J</creatorcontrib><creatorcontrib>Kerksick, Chad M</creatorcontrib><creatorcontrib>Lucia, Alejandro</creatorcontrib><creatorcontrib>Greenwood, Michael C</creatorcontrib><creatorcontrib>Almada, Anthony L</creatorcontrib><creatorcontrib>Cowan, Patty A</creatorcontrib><creatorcontrib>Kreider, Richard B</creatorcontrib><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>Journal of strength and conditioning research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Earnest, Conrad P</au><au>Lancaster, Stacy L</au><au>Rasmussen, Christopher J</au><au>Kerksick, Chad M</au><au>Lucia, Alejandro</au><au>Greenwood, Michael C</au><au>Almada, Anthony L</au><au>Cowan, Patty A</au><au>Kreider, Richard B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Low vs. High Glycemic Index Carbohydrate Gel Ingestion During Simulated 64-km Cycling Time Trial Performance</atitle><jtitle>Journal of strength and conditioning research</jtitle><addtitle>J Strength Cond Res</addtitle><date>2004-08</date><risdate>2004</risdate><volume>18</volume><issue>3</issue><spage>466</spage><epage>472</epage><pages>466-472</pages><issn>1064-8011</issn><eissn>1533-4287</eissn><abstract>Earnest, C.P., S. Lancaster, C. Rasmussen, C. Kerksick, A. Lucia, M. Greenwood, A. Almada, P. Cowan, and R. Kreider. Low vs. high glycemic index carbohydrate gel ingestion during simulated 64-km cycling time trial performance. J. Strength Cond. Res. 18(3):466–472. 2004.—We examined the effect of low and high glycemic index (GI) carbohydrate (CHO) feedings during a simulated 64-km cycling time trial (TT) in nine subjects ([mean ± SEM], age = 30 ± 1 years; weight = 77.0 ± 2.6 kg). Each rider completed three randomized, double blind, counterbalanced, crossover rides, where riders ingested 15 g of low GI (honey; GI = 35) and high GI (dextrose; GI = 100) CHO every 16 km. Our results showed no differences between groups for the time to complete the entire TT (honey = 128 minutes, 42 seconds ± 3.6 minutes; dextrose = 128 minutes, 18 seconds ± 3.8 minutes; placebo = 131 minutes, 18 seconds ± 3.9 minutes). However, an analysis of total time alone may not portray an accurate picture of TT performance under CHO-supplemented conditions. For example, when the CHO data were collapsed, the CHO condition (128 minutes, 30 seconds) proved faster than placebo condition (131 minutes, 18 seconds; p < 0.02). Furthermore, examining the percent differences and 95% confidence intervals (CI) shows the two CHO conditions to be generally faster, as the majority of the CI lies in the positive rangeplacebo vs. dextrose (2.36% [95% CI; -0.69, 4.64]) and honey (1.98% [95% CI; -0.30, 5.02]). Dextrose vs. honey was 0.39% (95% CI; -3.39, 4.15). Within treatment analysis also showed that subjects generated more watts (W) over the last 16 km vs. preceding segments for dextrose (p < 0.002) and honey (p < 0.0004) treatments. When the final 16-km W was expressed as a percentage of pretest maximal W, the dextrose treatment was greater than placebo (p < 0.05). A strong trend was noted for the honey condition (p < 0.06), despite no differences in heart rate (HR) or rate of perceived exertion (RPE). Our results show a trend for improvement in time and wattage over the last 16 km of a 64-km simulated TT regardless of glycemic index.</abstract><cop>United States</cop><pub>Copyright by the National Strength & Conditioning Association</pub><pmid>15320674</pmid><doi>10.1519/00124278-200408000-00013</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1064-8011 |
| ispartof | Journal of strength and conditioning research, 2004-08, Vol.18 (3), p.466-472 |
| issn | 1064-8011 1533-4287 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_66805830 |
| source | MEDLINE; Journals@Ovid Complete |
| subjects | Adult Bicycling - physiology Blood Glucose - analysis Cross-Over Studies Dietary Carbohydrates - pharmacology Double-Blind Method Exercise - physiology Gels Glucose - pharmacology Glycemic Index Heart Rate - drug effects Heart Rate - physiology Honey Humans Male Physical Endurance - drug effects Physical Endurance - physiology Task Performance and Analysis Time Factors |
| title | Low vs. High Glycemic Index Carbohydrate Gel Ingestion During Simulated 64-km Cycling Time Trial Performance |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-26T02%3A27%3A10IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Low%20vs.%20High%20Glycemic%20Index%20Carbohydrate%20Gel%20Ingestion%20During%20Simulated%2064-km%20Cycling%20Time%20Trial%20Performance&rft.jtitle=Journal%20of%20strength%20and%20conditioning%20research&rft.au=Earnest,%20Conrad%20P&rft.date=2004-08&rft.volume=18&rft.issue=3&rft.spage=466&rft.epage=472&rft.pages=466-472&rft.issn=1064-8011&rft.eissn=1533-4287&rft_id=info:doi/10.1519/00124278-200408000-00013&rft_dat=%3Cproquest_cross%3E66805830%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=66805830&rft_id=info:pmid/15320674&rfr_iscdi=true |