PMID- 3246466
OWN - NLM
STAT- MEDLINE
DCOM- 19890614
LR  - 20061115
IS  - 0172-4622 (Print)
IS  - 0172-4622 (Linking)
VI  - 9
IP  - 5
DP  - 1988 Oct
TI  - Effect of carbohydrate ingestion on exercise endurance and metabolism after a 
      1-day fast.
PG  - 320-4
AB  - Fasting before an exercise event has been demonstrated to decrease endurance. The 
      purpose of this study was to investigate whether this decrement in performance 
      after fasting could be reversed by ingestion of a carbohydrate solution before 
      and during exercise. Nine fit male subjects ran to exhaustion at approximately 
      70% VO2max in two counterbalanced trials. The subjects were fasted for 21 h 
      before both trials, and the trials were arranged so that the subjects ingested 
      either a carbohydrate (CHO) or placebo (PL) solution. Although ratings of 
      perceived exertion were significantly lower in the CHO trial, there were no 
      differences in endurance time to exhaustion in the two trials (102 +/- 8 min in 
      the PL trial and 106 +/- 8 min in the CHO trial). There were no differences 
      between trials for the VO2, heart rate, and blood lactate concentrations. As 
      expected, the blood glucose and insulin concentrations were higher in the CHO 
      trial. The respiratory exchange ratio was significantly higher in the CHO trial 
      at 40 min of exercise and tended to be higher at all other times, suggesting a 
      greater reliance on carbohydrate and less on fat as an energy source. This seemed 
      to be confirmed by the significantly lower plasma glycerol concentration, which 
      suggested less fat mobilization in the CHO trial. Ingestion of a glucose polymer 
      solution increased carbohydrate utilization in fasted subjects, but exercise 
      performance was not improved.
FAU - Riley, M L
AU  - Riley ML
AD  - Department of Biochemistry, East Carolina University, Greenville, North Carolina 
      27858.
FAU - Israel, R G
AU  - Israel RG
FAU - Holbert, D
AU  - Holbert D
FAU - Tapscott, E B
AU  - Tapscott EB
FAU - Dohm, G L
AU  - Dohm GL
LA  - eng
PT  - Clinical Trial
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
PL  - Germany
TA  - Int J Sports Med
JT  - International journal of sports medicine
JID - 8008349
RN  - 0 (Carbohydrates)
RN  - 0 (Fatty Acids)
SB  - IM
MH  - Adult
MH  - Carbohydrates/*pharmacology
MH  - Fasting
MH  - Fatty Acids/blood
MH  - Humans
MH  - Male
MH  - Oxygen Consumption
MH  - *Physical Endurance
EDAT- 1988/10/01 00:00
MHDA- 1988/10/01 00:01
CRDT- 1988/10/01 00:00
PHST- 1988/10/01 00:00 [pubmed]
PHST- 1988/10/01 00:01 [medline]
PHST- 1988/10/01 00:00 [entrez]
AID - 10.1055/s-2007-1025032 [doi]
PST - ppublish
SO  - Int J Sports Med. 1988 Oct;9(5):320-4. doi: 10.1055/s-2007-1025032.