Carbohydrate Oxidation from a Carbohydrate Gel Compared To a Drink during Exercise

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Carbohydrate Oxidation from a Carbohydrate Gel Compared To a Drink during Exercise. / Pfeiffer, B; Stellingwerff, T; Zaltas, E; Jeukendrup, Asker.

In: Medicine and Science in Sports and Exercise, 01.01.2010.

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@article{c1765ebd2bca40b188709a24e7853fe1,
title = "Carbohydrate Oxidation from a Carbohydrate Gel Compared To a Drink during Exercise",
abstract = "Recently it has been shown that ingestion of solutions with glucose (GLU) and fructose (FRC) leads to 20-50% higher CHO oxidation rates as compared to GLU alone. Although the vast majority of laboratory studies used solutions to deliver CHO, in practice, athletes often ingest CHO in the form of gels (semi-solid). It is currently not known if CHO ingested in the form of a gel is oxidized as effectively as a drink. PURPOSE:: To investigate exogenous CHO oxidation from CHO provided in semi-solid (GEL) or solution (DRINK) form during cycling. METHOD:: Eight well trained cyclists (34+/-7 yrs; 76+/-9 kg; VO2max: 61+/-7 ml/kg/min) performed three exercise trials in random order. The trials consisted of cycling at 59+/-4% VO2max for 180 min while receiving one of the following three treatments: GEL plus plain water, DRINK, or plain water. Both CHO treatments delivered GLU plus FRC in a ratio of 2:1 at a rate of 1.8g/min (108g/hr). Fluid intake was matched between treatments at 867 ml/hr. RESULTS:: Exogenous CHO oxidation from GEL and DRINK showed a similar time-course with peak exogenous CHO oxidation rates being reached at the end of 180 min exercise. Peak exogenous CHO oxidation rates were not significantly different (p=0.40) between GEL and DRINK (1.44+/-0.29 g/min vs. 1.42+/-0.23 g/min, respectively). Furthermore, oxidation efficiency was not significantly different (p=0.36) between GEL and DRINK (71+/-15%vs. 69+/-13%, respectively). CONCLUSION:: This study demonstrates that a GLU+FRC mixture is oxidized to the same degree when administered as either semi-solid GEL or liquid DRINK, leading to similarly high peak oxidation rates and oxidation efficiencies.",
keywords = "CYCLING, CHO INGESTION, EXOGENOUS CHO OXIDATION, CHO FORM",
author = "B Pfeiffer and T Stellingwerff and E Zaltas and Asker Jeukendrup",
year = "2010",
month = jan,
day = "1",
doi = "10.1249/MSS.0b013e3181e0efe6",
language = "English",
journal = "Medicine and Science in Sports and Exercise",
issn = "0195-9131",
publisher = "American College of Sports Medicine",

}

RIS

TY - JOUR

T1 - Carbohydrate Oxidation from a Carbohydrate Gel Compared To a Drink during Exercise

AU - Pfeiffer, B

AU - Stellingwerff, T

AU - Zaltas, E

AU - Jeukendrup, Asker

PY - 2010/1/1

Y1 - 2010/1/1

N2 - Recently it has been shown that ingestion of solutions with glucose (GLU) and fructose (FRC) leads to 20-50% higher CHO oxidation rates as compared to GLU alone. Although the vast majority of laboratory studies used solutions to deliver CHO, in practice, athletes often ingest CHO in the form of gels (semi-solid). It is currently not known if CHO ingested in the form of a gel is oxidized as effectively as a drink. PURPOSE:: To investigate exogenous CHO oxidation from CHO provided in semi-solid (GEL) or solution (DRINK) form during cycling. METHOD:: Eight well trained cyclists (34+/-7 yrs; 76+/-9 kg; VO2max: 61+/-7 ml/kg/min) performed three exercise trials in random order. The trials consisted of cycling at 59+/-4% VO2max for 180 min while receiving one of the following three treatments: GEL plus plain water, DRINK, or plain water. Both CHO treatments delivered GLU plus FRC in a ratio of 2:1 at a rate of 1.8g/min (108g/hr). Fluid intake was matched between treatments at 867 ml/hr. RESULTS:: Exogenous CHO oxidation from GEL and DRINK showed a similar time-course with peak exogenous CHO oxidation rates being reached at the end of 180 min exercise. Peak exogenous CHO oxidation rates were not significantly different (p=0.40) between GEL and DRINK (1.44+/-0.29 g/min vs. 1.42+/-0.23 g/min, respectively). Furthermore, oxidation efficiency was not significantly different (p=0.36) between GEL and DRINK (71+/-15%vs. 69+/-13%, respectively). CONCLUSION:: This study demonstrates that a GLU+FRC mixture is oxidized to the same degree when administered as either semi-solid GEL or liquid DRINK, leading to similarly high peak oxidation rates and oxidation efficiencies.

AB - Recently it has been shown that ingestion of solutions with glucose (GLU) and fructose (FRC) leads to 20-50% higher CHO oxidation rates as compared to GLU alone. Although the vast majority of laboratory studies used solutions to deliver CHO, in practice, athletes often ingest CHO in the form of gels (semi-solid). It is currently not known if CHO ingested in the form of a gel is oxidized as effectively as a drink. PURPOSE:: To investigate exogenous CHO oxidation from CHO provided in semi-solid (GEL) or solution (DRINK) form during cycling. METHOD:: Eight well trained cyclists (34+/-7 yrs; 76+/-9 kg; VO2max: 61+/-7 ml/kg/min) performed three exercise trials in random order. The trials consisted of cycling at 59+/-4% VO2max for 180 min while receiving one of the following three treatments: GEL plus plain water, DRINK, or plain water. Both CHO treatments delivered GLU plus FRC in a ratio of 2:1 at a rate of 1.8g/min (108g/hr). Fluid intake was matched between treatments at 867 ml/hr. RESULTS:: Exogenous CHO oxidation from GEL and DRINK showed a similar time-course with peak exogenous CHO oxidation rates being reached at the end of 180 min exercise. Peak exogenous CHO oxidation rates were not significantly different (p=0.40) between GEL and DRINK (1.44+/-0.29 g/min vs. 1.42+/-0.23 g/min, respectively). Furthermore, oxidation efficiency was not significantly different (p=0.36) between GEL and DRINK (71+/-15%vs. 69+/-13%, respectively). CONCLUSION:: This study demonstrates that a GLU+FRC mixture is oxidized to the same degree when administered as either semi-solid GEL or liquid DRINK, leading to similarly high peak oxidation rates and oxidation efficiencies.

KW - CYCLING

KW - CHO INGESTION

KW - EXOGENOUS CHO OXIDATION

KW - CHO FORM

U2 - 10.1249/MSS.0b013e3181e0efe6

DO - 10.1249/MSS.0b013e3181e0efe6

M3 - Article

C2 - 20404763

JO - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

SN - 0195-9131

ER -