PMID- 10188753
OWN - NLM
STAT- MEDLINE
DCOM- 19990506
LR  - 20190831
IS  - 0195-9131 (Print)
IS  - 0195-9131 (Linking)
VI  - 31
IP  - 3
DP  - 1999 Mar
TI  - The effect of a preexercise meal on time to fatigue during prolonged cycling 
      exercise.
PG  - 464-71
AB  - PURPOSE AND METHODS: Seven subjects exercised to exhaustion on a bicycle 
      ergometer at a workload corresponding to an intensity of 70% maximal oxygen 
      uptake (VO2max). On one occasion (FED), subjects consumed a preexercise 
      carbohydrate (CHO) containing breakfast (100 g CHO) 3 h before exercise. On the 
      other occasion (FASTED), subjects exercised after an overnight fast. Exercise 
      time to fatigue was significantly longer (P < 0.05) when subjects consumed the 
      breakfast (136+/-14 min) compared with when they exercised in the fasted state 
      (109+/-12 min). RESULTS: Pre- and post-exercise muscle glycogen concentrations, 
      respiratory exchange ratio, carbohydrate and fat oxidation, and lactate and 
      insulin concentrations were not significantly different between the two trials. 
      Insulin concentrations decreased significantly (P < 0.05) from 4.7+/-0.05 
      microIU.mL(-1) to 2.8+/-0.4 microIU.mL(-1) in FED and from 6.6+/-0.6 
      microIU.mL(-1) to 3.7+/-0.6 microIU.mL(-1) in FASTED subjects and free fatty acid 
      concentrations (FFA) increased significantly (P < 0.05) from 0.09+/-0.02 
      mmol.L(-1) to 1.4+/-0.6 mmol.L(-1) in FED and from 0.17+/-0.02 mmol.L(-) to 
      0.74+/-0.27 mmol.L(-1) in FASTED subjects over the duration of the trials. 
      CONCLUSIONS: In conclusion, the important finding of this study is the increased 
      time to fatigue when subjects ingested the CHO meal with no negative effects 
      ascribed to increased insulin concentrations and decreased FFA concentrations 
      after CHO ingestion.
FAU - Schabort, E J
AU  - Schabort EJ
AD  - MRC/UCT Bioenergetics of Exercise Research Unit, Sports Science Institute of 
      South Africa, Newlands.
FAU - Bosch, A N
AU  - Bosch AN
FAU - Weltan, S M
AU  - Weltan SM
FAU - Noakes, T D
AU  - Noakes TD
LA  - eng
PT  - Clinical Trial
PT  - Journal Article
PT  - Randomized Controlled Trial
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)
RN  - 0 (Insulin)
RN  - 33X04XA5AT (Lactic Acid)
RN  - 9005-79-2 (Glycogen)
SB  - IM
MH  - Adult
MH  - Bicycling/*physiology
MH  - Blood Glucose/metabolism
MH  - *Dietary Carbohydrates
MH  - *Eating
MH  - Exercise/*physiology
MH  - Fatty Acids, Nonesterified/blood
MH  - Glycogen/metabolism
MH  - Humans
MH  - Insulin/blood
MH  - Lactic Acid/blood
MH  - Male
MH  - Muscle, Skeletal/metabolism
MH  - Oxygen Consumption
MH  - Physical Endurance/*physiology
MH  - Respiration
EDAT- 1999/04/03 00:00
MHDA- 1999/04/03 00:01
CRDT- 1999/04/03 00:00
PHST- 1999/04/03 00:00 [pubmed]
PHST- 1999/04/03 00:01 [medline]
PHST- 1999/04/03 00:00 [entrez]
AID - 10.1097/00005768-199903000-00017 [doi]
PST - ppublish
SO  - Med Sci Sports Exerc. 1999 Mar;31(3):464-71. doi: 
      10.1097/00005768-199903000-00017.