PMID- 18023253
OWN - NLM
STAT- MEDLINE
DCOM- 20080605
LR  - 20211018
IS  - 1440-2440 (Print)
IS  - 1878-1861 (Linking)
VI  - 11
IP  - 1
DP  - 2008 Jan
TI  - Double blind carbohydrate ingestion does not improve exercise duration in warm 
      humid conditions.
PG  - 72-9
AB  - The positive effects of carbohydrate (CHO) supplementation on endurance exercise 
      are well documented but the placebo (PLA(c)) effect can make the ergogenic 
      qualities of substances more difficult to determine. Therefore, this study tested 
      the effect of double blind ingestion of PLA(c) and CHO(c) in capsules versus 
      known capsule (CHO(k)) ingestion on prolonged exercise heat stress. Nine well 
      trained male volunteers (mean+/-S.D.: 23+/-3 years; 62.4+/-6.5 kg and 65.8+/-5.2 
      mL kg(-1) min(-1) peak oxygen consumption) exercised at 60% of maximum power 
      output until volitional exhaustion (TTE) in the three different conditions. 
      Capsules were ingested with 252+/-39 mL of water. Blood glucose in CHO(c) and 
      CHO(k) was similar but higher (p<0.05) than PLA(c) from 45 min to end of 
      exercise. There were no differences in TTE between PLA(c) (125.2+/-37.1 min) or 
      CHO(c) (138.8+/-47.0 min) or between CHO(c) and CHO(k) (155.8+/-54.2 min). Time 
      to volitional exhaustion was different between PLA(c) and CHO(k) (p<0.05). 
      Increased TTE resulted when participants and researchers knew the capsule 
      content, but not in the double blind condition. The difference could be related 
      to a combined effect of CHO ingestion and knowledge of what was ingested possibly 
      acting as a potent psychological motivator.
FAU - Nassif, Camila
AU  - Nassif C
AD  - School of Human Movement Studies, Charles Sturt University, Australia.
FAU - Ferreira, Ana Paula Araujo
AU  - Ferreira AP
FAU - Gomes, Aline Regina
AU  - Gomes AR
FAU - Silva, Luciana De Martin
AU  - Silva Lde M
FAU - Garcia, Emerson Silami
AU  - Garcia ES
FAU - Marino, Frank E
AU  - Marino FE
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20071126
PL  - Australia
TA  - J Sci Med Sport
JT  - Journal of science and medicine in sport
JID - 9812598
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Placebos)
SB  - IM
MH  - Adult
MH  - Dietary Carbohydrates/*administration & dosage
MH  - Double-Blind Method
MH  - Exercise/*physiology
MH  - Heat Stress Disorders/prevention & control
MH  - *Hot Temperature
MH  - Humans
MH  - *Humidity
MH  - Male
MH  - Placebos
EDAT- 2007/11/21 09:00
MHDA- 2008/06/06 09:00
CRDT- 2007/11/21 09:00
PHST- 2006/08/22 00:00 [received]
PHST- 2007/08/16 00:00 [revised]
PHST- 2007/08/24 00:00 [accepted]
PHST- 2007/11/21 09:00 [pubmed]
PHST- 2008/06/06 09:00 [medline]
PHST- 2007/11/21 09:00 [entrez]
AID - S1440-2440(07)00206-X [pii]
AID - 10.1016/j.jsams.2007.08.015 [doi]
PST - ppublish
SO  - J Sci Med Sport. 2008 Jan;11(1):72-9. doi: 10.1016/j.jsams.2007.08.015. Epub 2007 
      Nov 26.