PMID- 15354044
OWN - NLM
STAT- MEDLINE
DCOM- 20041209
LR  - 20190902
IS  - 0195-9131 (Print)
IS  - 0195-9131 (Linking)
VI  - 36
IP  - 9
DP  - 2004 Sep
TI  - Effects of preexercise carbohydrate ingestion on mountain bike performance.
PG  - 1602-9
AB  - PURPOSE: This study examined the performance and metabolic effects of consuming 
      1.0 (LC) and 3.0 (HC) grams of carbohydrate (CHO) per kilogram body mass (BM), 3 
      h before a 93-min simulated mountain bike race. METHODS: After two 
      familiarization trials, eight male subjects undertook two CHO trials in a 
      double-blind counterbalanced fashion on a cycle ergometer. The HC meal was 
      supplemented with maltodextrin while maintaining the same glycemic index and 
      apparent volume of food as the LC meal. Stochastic cycling was undertaken for 93 
      min (4 x 22.50-min laps) with performance measured as the total work performed in 
      6 x 30-s periods each lap during the test. RESULTS: Performance in lap 1 was 
      better with LC (P < 0.03) whereas performance in lap 4 was better with HC (P < 
      0.02). Overall performance was 3% greater in HC compared with LC (NS, P = 0.13). 
      Serum glucose was significantly lower (P < 0.04) in HC immediately before the 
      mountain bike test (180 min postprandial) and at 10 min into the test (P < 0.01). 
      Gastrointestinal comfort decreased similarly for both trials over time (P < 
      0.05). CONCLUSION: These data suggest that ingestion of 3.0 g x kg(-1) BM of CHO 
      3 h before a 93-min mountain bike simulated race does not produce a statistically 
      significant improvement in overall performance compared with 1.0 g x kg(-1) BM. 
      However, in real terms, a 3% performance improvement may benefit athletes in a 
      race situation. Differences in performance during the first and last laps 
      indicate a variation in pacing strategies that may have resulted from differing 
      blood glucose levels between trials.
FAU - Cramp, Tanya
AU  - Cramp T
AD  - Department of Biomedical Science, University of Wollongong, NSW, Australia.
FAU - Broad, Elizabeth
AU  - Broad E
FAU - Martin, David
AU  - Martin D
FAU - Meyer, Barbara J
AU  - Meyer BJ
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Med Sci Sports Exerc
JT  - Medicine and science in sports and exercise
JID - 8005433
RN  - 0 (Blood Glucose)
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Fatty Acids, Nonesterified)
SB  - IM
MH  - Adult
MH  - Australia
MH  - Bicycling/*physiology
MH  - Blood Glucose/analysis
MH  - Dietary Carbohydrates/*administration & dosage
MH  - Drinking Behavior
MH  - Fatty Acids, Nonesterified/analysis
MH  - Gastrointestinal Tract/physiopathology
MH  - Humans
MH  - Male
MH  - Oxygen Consumption
MH  - Physical Exertion
MH  - Respiration
MH  - *Task Performance and Analysis
EDAT- 2004/09/09 05:00
MHDA- 2004/12/16 09:00
CRDT- 2004/09/09 05:00
PHST- 2004/09/09 05:00 [pubmed]
PHST- 2004/12/16 09:00 [medline]
PHST- 2004/09/09 05:00 [entrez]
AID - 00005768-200409000-00021 [pii]
AID - 10.1249/01.mss.0000139805.91675.5b [doi]
PST - ppublish
SO  - Med Sci Sports Exerc. 2004 Sep;36(9):1602-9. doi: 
      10.1249/01.mss.0000139805.91675.5b.