PMID- 25203688
OWN - NLM
STAT- MEDLINE
DCOM- 20160330
LR  - 20150707
IS  - 1543-2742 (Electronic)
IS  - 1526-484X (Linking)
VI  - 25
IP  - 3
DP  - 2015 Jun
TI  - The Ingestion of 39 or 64 g.h(-1) of Carbohydrate is Equally Effective at 
      Improving Endurance Exercise Performance in Cyclists.
PG  - 285-92
LID - 10.1123/ijsnem.2014-0134 [doi]
AB  - In an investigator-blind, randomized cross-over design, male cyclists (mean+/- SD) 
      age 34.0 (+/- 10.2) years, body mass 74.6 (+/-7.9) kg, stature 178.3 (+/-8.0) cm, peak 
      power output (PPO) 393 (+/-36) W, and VO2max 62 (+/-9) ml.kg-1.min(-1) training for 
      more than 6 hr/wk for more than 3y (n = 20) completed four experimental trials. 
      Each trial consisted of a 2-hr constant load ride at 95% of lactate threshold 
      (185 +/- 25 W) then a work-matched time trial task (~30 min at 70% of PPO). Three 
      commercially available carbohydrate (CHO) beverages, plus a control (water), were 
      administered during the 2-hr ride providing 0, 20, 39, or 64 g.hr-1 of CHO at a 
      fluid intake rate of 1L.hr(-1). Performance was assessed by time to complete the 
      time trial task, mean power output sustained, and pacing strategy used. Mean task 
      completion time (min:sec +/- SD) for 39 g.hr(-1) (34:19.5 +/- 03:07.1, p = .006) and 
      64 g.hr(-1) (34:11.3 +/- 03:08.5 p = .004) of CHO were significantly faster than 
      control (37:01.9 +/- 05:35.0). The mean percentage improvement from control was 
      -6.1% (95% CI: -11.3 to -1.0) and -6.5% (95% CI: -11.7 to -1.4) in the 39 and 64 
      g.hr(-1) trials respectively. The 20 g.hr(-1) (35:17.6 +/- 04:16.3) treatment did 
      not reach statistical significance compared with control (p = .126) despite a 
      mean improvement of -3.7% (95% CI -8.8-1.5%). No further differences between CHO 
      trials were reported. No interaction between CHO dose and pacing strategy 
      occurred. 39 and 64 g.hr-1 of CHO were similarly effective at improving endurance 
      cycling performance compared with a 0 g.hr(-1) control in our trained cyclists.
FAU - Newell, Michael L
AU  - Newell ML
AD  - Health & Exercise Sciences Research Group, School of Sport, University of 
      Stirling, Scotland, U.K.
FAU - Hunter, Angus M
AU  - Hunter AM
FAU - Lawrence, Claire
AU  - Lawrence C
FAU - Tipton, Kevin D
AU  - Tipton KD
FAU - Galloway S, D R
AU  - Galloway S DR
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
DEP - 20140908
PL  - United States
TA  - Int J Sport Nutr Exerc Metab
JT  - International journal of sport nutrition and exercise metabolism
JID - 100939812
RN  - 0 (Dietary Carbohydrates)
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
MH  - Adult
MH  - Anaerobic Threshold
MH  - Athletic Performance/*physiology
MH  - *Beverages
MH  - Bicycling/*physiology
MH  - Cross-Over Studies
MH  - Dietary Carbohydrates/*administration & dosage
MH  - Eating
MH  - Humans
MH  - Lactic Acid/metabolism
MH  - Male
MH  - Physical Endurance/*drug effects
MH  - Sports Nutritional Physiological Phenomena
EDAT- 2014/09/10 06:00
MHDA- 2016/03/31 06:00
CRDT- 2014/09/10 06:00
PHST- 2014/09/10 06:00 [entrez]
PHST- 2014/09/10 06:00 [pubmed]
PHST- 2016/03/31 06:00 [medline]
AID - 2014-0134 [pii]
AID - 10.1123/ijsnem.2014-0134 [doi]
PST - ppublish
SO  - Int J Sport Nutr Exerc Metab. 2015 Jun;25(3):285-92. doi: 
      10.1123/ijsnem.2014-0134. Epub 2014 Sep 8.