PMID- 20190350
OWN - NLM
STAT- MEDLINE
DCOM- 20100323
LR  - 20191111
IS  - 1526-484X (Print)
IS  - 1526-484X (Linking)
VI  - 20
IP  - 1
DP  - 2010 Feb
TI  - Isocaloric carbohydrate versus carbohydrate-protein ingestion and cycling 
      time-trial performance.
PG  - 34-43
AB  - This study was designed to compare the effects of energy-matched carbohydrate 
      (CHO) and carbohydrate-protein (CHO-PRO) supplements on cycling time-trial 
      performance. Twelve competitive male cyclists and triathletes each completed 2 
      trials in a randomized and counterbalanced order that were separated by 5-10 d 
      and applied in a double-blind manner. Participants performed a 45-min 
      variable-intensity exercise protocol on a cycle ergometer while ingesting either 
      a 9% CHO solution or a mixture of 6.8% CHO plus 2.2% protein in volumes providing 
      22 kJ/kg body mass. Participants were then asked to cycle 6 km in the shortest 
      time possible. Blood glucose and lactate concentrations were measured every 15 
      min during exercise, along with measures of substrate oxidation via indirect 
      calorimetry, heart rate, and ratings of perceived exertion. Mean time to complete 
      the 6-km time trial was 433 + or - 21 s in CHO trials and 438 + or - 22 s in 
      CHO-PRO trials, which represents a 0.94% (CI: 0.01, 1.86) decrement in 
      performance with the inclusion of protein (p = .048). However, no other variable 
      measured in this study was significantly different between trials. Reducing the 
      quantity of CHO included in a supplement and replacing it with protein may not 
      represent an effective nutritional strategy when the supplement is ingested 
      during exercise. This may reflect the central ergogenic influence of exogenous 
      CHO during such activity.
FAU - Toone, Rebecca J
AU  - Toone RJ
AD  - Sport and Exercise Science, University of Bath, United Kingdom.
FAU - Betts, James A
AU  - Betts JA
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - Int J Sport Nutr Exerc Metab
JT  - International journal of sport nutrition and exercise metabolism
JID - 100939812
RN  - 0 (Amino Acids)
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Dietary Proteins)
RN  - 0 (Insulin)
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
EIN - Int J Sport Nutr Exerc Metab. 2010 Jun;20(3):272
MH  - Amino Acids/blood
MH  - Bicycling/*physiology
MH  - Cross-Over Studies
MH  - Dietary Carbohydrates/*administration & dosage/metabolism
MH  - Dietary Proteins/*administration & dosage/metabolism
MH  - Double-Blind Method
MH  - Energy Intake
MH  - Energy Metabolism/drug effects/*physiology
MH  - Exercise Test
MH  - Humans
MH  - Insulin/blood
MH  - Lactic Acid/blood
MH  - Male
MH  - Oxidation-Reduction
MH  - Oxygen Consumption
MH  - Time Factors
MH  - Young Adult
EDAT- 2010/03/02 06:00
MHDA- 2010/03/24 06:00
CRDT- 2010/03/02 06:00
PHST- 2010/03/02 06:00 [entrez]
PHST- 2010/03/02 06:00 [pubmed]
PHST- 2010/03/24 06:00 [medline]
AID - 10.1123/ijsnem.20.1.34 [doi]
PST - ppublish
SO  - Int J Sport Nutr Exerc Metab. 2010 Feb;20(1):34-43. doi: 10.1123/ijsnem.20.1.34.