PMID- 18218905
OWN - NLM
STAT- MEDLINE
DCOM- 20080617
LR  - 20131121
IS  - 8750-7587 (Print)
IS  - 0161-7567 (Linking)
VI  - 104
IP  - 4
DP  - 2008 Apr
TI  - Effect of carbohydrate ingestion and ambient temperature on muscle fatigue 
      development in endurance-trained male cyclists.
PG  - 1021-8
LID - 10.1152/japplphysiol.00683.2007 [doi]
AB  - The aim of the present study was to determine the effect of carbohydrate (CHO; 
      sucrose) ingestion and environmental heat on the development of fatigue and the 
      distribution of power output during a 16.1-km cycling time trial. Ten male 
      cyclists (Vo(2max) = 61.7 +/- 5.0 ml.kg(-1).min(-1), mean +/- SD) performed four 
      90-min constant-pace cycling trials at 80% of second ventilatory threshold (220 
      +/- 12 W). Trials were conducted in temperate (18.1 +/- 0.4 degrees C) or hot 
      (32.2 +/- 0.7 degrees C) conditions during which subjects ingested either CHO 
      (0.96 g.kg(-1).h(-1)) or placebo (PLA) gels. All trials were followed by a 
      16.1-km time trial. Before and immediately after exercise, percent muscle 
      activation was determined using superimposed electrical stimulation. Power 
      output, integrated electromyography (iEMG) of vastus lateralis, rectal 
      temperature, and skin temperature were recorded throughout the trial. Percent 
      muscle activation significantly declined during the CHO and PLA trials in hot 
      (6.0 and 6.9%, respectively) but not temperate conditions (1.9 and 2.2%, 
      respectively). The decline in power output during the first 6 km was 
      significantly greater during exercise in the heat. iEMG correlated significantly 
      with power output during the CHO trials in hot and temperate conditions (r = 0.93 
      and 0.73; P < 0.05) but not during either PLA trial. In conclusion, cyclists 
      tended to self-select an aggressive pacing strategy (initial high intensity) in 
      the heat.
FAU - Abbiss, Chris R
AU  - Abbiss CR
AD  - School of Exercise, Biomedical and Health Sciences, Edith Cowan Univ., 100 
      Joondalup Dr., Joondalup, WA, Australia. c.abbiss@ecu.edu.au
FAU - Peiffer, Jeremiah J
AU  - Peiffer JJ
FAU - Peake, Jonathan M
AU  - Peake JM
FAU - Nosaka, Kazunori
AU  - Nosaka K
FAU - Suzuki, Katsuhiko
AU  - Suzuki K
FAU - Martin, David T
AU  - Martin DT
FAU - Laursen, Paul B
AU  - Laursen PB
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
DEP - 20080124
PL  - United States
TA  - J Appl Physiol (1985)
JT  - Journal of applied physiology (Bethesda, Md. : 1985)
JID - 8502536
RN  - 0 (Blood Glucose)
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Fatty Acids, Nonesterified)
RN  - 33X04XA5AT (Lactic Acid)
RN  - 9002-62-4 (Prolactin)
RN  - VTD58H1Z2X (Dopamine)
SB  - IM
MH  - Adult
MH  - Bicycling/*physiology
MH  - Blood Glucose/metabolism
MH  - Body Temperature/drug effects/physiology
MH  - Cross-Over Studies
MH  - Dietary Carbohydrates/*pharmacology
MH  - Dopamine/blood
MH  - Electric Stimulation
MH  - Electromyography
MH  - Fatty Acids, Nonesterified/blood
MH  - Humans
MH  - Lactic Acid/blood
MH  - Male
MH  - Muscle Fatigue/drug effects/*physiology
MH  - Physical Endurance/*physiology
MH  - Physical Fitness/*physiology
MH  - Prolactin/blood
MH  - Skin Temperature/drug effects/physiology
MH  - *Temperature
EDAT- 2008/01/26 09:00
MHDA- 2008/06/18 09:00
CRDT- 2008/01/26 09:00
PHST- 2008/01/26 09:00 [pubmed]
PHST- 2008/06/18 09:00 [medline]
PHST- 2008/01/26 09:00 [entrez]
AID - 00683.2007 [pii]
AID - 10.1152/japplphysiol.00683.2007 [doi]
PST - ppublish
SO  - J Appl Physiol (1985). 2008 Apr;104(4):1021-8. doi: 
      10.1152/japplphysiol.00683.2007. Epub 2008 Jan 24.