PMID- 12739159
OWN - NLM
STAT- MEDLINE
DCOM- 20040226
LR  - 20181113
IS  - 0031-6768 (Print)
IS  - 0031-6768 (Linking)
VI  - 446
IP  - 2
DP  - 2003 May
TI  - Carbohydrate supplementation improves moderate and high-intensity exercise in the 
      heat.
PG  - 211-9
AB  - The aim of the present study was to clarify the effect of carbohydrate (CHO) 
      supplementation on moderate and high-intensity endurance exercise in the heat. 
      Eight endurance-trained men [maximal oxygen uptake ( VO(2max)) 59.5+/-1.6 ml 
      kg(-1) bw(-1), mean+/-SE] cycled to exhaustion twice at 60% VO(2max) and twice at 
      73% VO(2max) at an ambient temperature of 35 degrees C. Subjects ingested either 
      a 6.4% maltodextrin solution (CHO) or an artificially flavoured and coloured 
      placebo (PLA). Time to fatigue was significantly greater with CHO in both the 60% 
      and 73% VO(2max) trials (14.5% and 13.5% improvement, respectively). Heart rate 
      and oxygen uptake ( VO(2)) did not differ at any point between PLA and CHO. 
      Hypoglycaemia was not seen in any condition but plasma glucose concentrations 
      tended to be higher at both intensities when CHO was fed. CHO oxidation rates 
      were similar at 60% VO(2max) between CHO and PLA. There were no differences 
      between PLA and CHO in the rate of rise of rectal temperatures ( T(rec)) at 
      either intensity but there was a trend for subjects to fatigue at a high 
      temperature when taking CHO. Ratings of perceived exertion (RPE) tended to be 
      lower throughout both CHO trials; this was significant at 80 min and at fatigue 
      at 60% VO(2max). It is concluded that supplementation with CHO improves exercise 
      performance in the heat at both moderate and high endurance intensities. In the 
      absence of a clear metabolic explanation, a central effect involving an increased 
      tolerance of rising deep body temperature merits further investigation.
FAU - Carter, James
AU  - Carter J
AD  - Human Performance Laboratory, School of Sport and Exercise Sciences, The 
      University of Birmingham, B15 2TT, Edgbaston, Birmingham, UK. jmc717@bham.ac.uk
FAU - Jeukendrup, Asker E
AU  - Jeukendrup AE
FAU - Mundel, Toby
AU  - Mundel T
FAU - Jones, David A
AU  - Jones DA
LA  - eng
PT  - Comparative Study
PT  - Journal Article
DEP - 20030304
PL  - Germany
TA  - Pflugers Arch
JT  - Pflugers Archiv : European journal of physiology
JID - 0154720
RN  - 0 (Dietary Carbohydrates)
SB  - IM
MH  - Adult
MH  - Analysis of Variance
MH  - Dietary Carbohydrates/*pharmacology
MH  - Exercise/*physiology
MH  - *Hot Temperature/adverse effects
MH  - Humans
MH  - Male
MH  - Physical Endurance/*drug effects/physiology
MH  - Statistics, Nonparametric
EDAT- 2003/05/10 05:00
MHDA- 2004/02/27 05:00
CRDT- 2003/05/10 05:00
PHST- 2002/08/23 00:00 [received]
PHST- 2002/11/07 00:00 [revised]
PHST- 2003/01/17 00:00 [accepted]
PHST- 2003/05/10 05:00 [pubmed]
PHST- 2004/02/27 05:00 [medline]
PHST- 2003/05/10 05:00 [entrez]
AID - 10.1007/s00424-003-1020-4 [doi]
PST - ppublish
SO  - Pflugers Arch. 2003 May;446(2):211-9. doi: 10.1007/s00424-003-1020-4. Epub 2003 
      Mar 4.