PMID- 21234592
OWN - NLM
STAT- MEDLINE
DCOM- 20111213
LR  - 20211020
IS  - 1439-6327 (Electronic)
IS  - 1439-6319 (Linking)
VI  - 111
IP  - 8
DP  - 2011 Aug
TI  - The effect of a carbohydrate beverage on the physiological responses during 
      prolonged load carriage.
PG  - 1901-8
LID - 10.1007/s00421-010-1822-y [doi]
AB  - Effects of a carbohydrate beverage on the physiological responses to load 
      carriage were examined. Ten fit male participants (age: 28 +/- 9 years, body mass: 
      81.5 +/- 10.5 kg, VO(2max): 55.0 +/- 5.5 mL kg(-1) min(-1)) completed two test 
      conditions in random order, walking on a treadmill (6.5 km h(-1)) for 120 min, 
      carrying a 25-kg backpack. At 0 and 60 min of exercise participants consumed 250 
      mL of a placebo (flavoured water) (PLA) or 6.4% carbohydrate (CHO) beverage. 
      There were no differences in VO(2,) respiratory exchange ratio (RER), heart rate 
      or EMG activity of m. rectus femoris, m. vastus lateralis, m. semitendinosus and 
      m. biceps femoris between conditions at minute 5 of exercise. The increase in 
      VO(2) between minutes 5 and 120 was less during CHO than PLA (8 +/- 5 vs. 14 +/- 6%, 
      P = 0.036). RER decreased during PLA, from 0.96 +/- 0.05 at minute 5 to 0.87 +/- 0.04 
      at minute 120 (P < 0.001), but not during CHO (P = 0.056). Heart rate increased 
      between minutes 5 and 120 during PLA (16 +/- 10%, P < 0.001) and CHO (12 +/- 6%, P < 
      0.001), with no difference between conditions (P = 0.251). EMG peak RMS did not 
      change between minutes 7 and 107 during PLA or CHO for the leg muscles. However, 
      individual responses in EMG were highly variable (i.e. both increases and 
      decreases in RMS). It was concluded that carbohydrate intake during load carriage 
      reduced the VO(2) drift, which could be partially attributed to higher 
      carbohydrate oxidation rates. Despite muscle fatigue/damage previously being 
      identified as a cause of VO(2) drift, it appears that carbohydrate had no effect 
      on neuromuscular responses during load carriage.
FAU - Blacker, Sam D
AU  - Blacker SD
AD  - Department of Sport and Exercise Sciences, University of Chichester, College 
      Lane, Chichester, West Sussex, PO19 6PE, UK. sam@optimalperformance.co.uk
FAU - Williams, Neil C
AU  - Williams NC
FAU - Fallowfield, Joanne L
AU  - Fallowfield JL
FAU - Willems, Mark E T
AU  - Willems ME
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
DEP - 20110114
PL  - Germany
TA  - Eur J Appl Physiol
JT  - European journal of applied physiology
JID - 100954790
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Placebos)
SB  - IM
MH  - Adult
MH  - *Beverages
MH  - Dietary Carbohydrates/*pharmacology
MH  - Exercise/*physiology
MH  - Exercise Test/*drug effects/methods
MH  - Humans
MH  - Male
MH  - Muscle Fatigue/drug effects
MH  - Physical Exertion/drug effects
MH  - Placebos
MH  - Pulmonary Gas Exchange/drug effects/physiology
MH  - Time Factors
MH  - Walking/*physiology
MH  - Weight-Bearing/physiology
MH  - Young Adult
EDAT- 2011/01/15 06:00
MHDA- 2011/12/14 06:00
CRDT- 2011/01/15 06:00
PHST- 2010/10/04 00:00 [received]
PHST- 2010/12/27 00:00 [accepted]
PHST- 2011/01/15 06:00 [entrez]
PHST- 2011/01/15 06:00 [pubmed]
PHST- 2011/12/14 06:00 [medline]
AID - 10.1007/s00421-010-1822-y [doi]
PST - ppublish
SO  - Eur J Appl Physiol. 2011 Aug;111(8):1901-8. doi: 10.1007/s00421-010-1822-y. Epub 
      2011 Jan 14.