PMID- 19461531
OWN - NLM
STAT- MEDLINE
DCOM- 20100929
LR  - 20131121
IS  - 1530-0315 (Electronic)
IS  - 0195-9131 (Linking)
VI  - 41
IP  - 6
DP  - 2009 Jun
TI  - Effects of carbohydrate supplementation on the RPE-blood lactate relationship.
PG  - 1326-33
LID - 10.1249/MSS.0b013e3181967637 [doi]
AB  - PURPOSE: To examine the effects of carbohydrate (CHO) ingestion on the RPE-blood 
      lactate relationship during incremental and constant-effort exercise. METHODS: 
      Six male and three female subjects (mean age = 27.2 +/- 8.2 yr, height [ht] = 
      174.5 +/- 13.5 cm, weight [wt] = 68.9 +/- 12.5 kg, body fat = 18.5 +/- 8.3%), 
      completed two incremental cycling lactate threshold (LT)/(.)VO2peak tests 
      followed by two 45-min production trials. Two hundred and forty milliliters of 
      either carbohydrate or placebo (PL) was ingested before and every 15 min during 
      exercise. RESULTS: No differences were observed between conditions at LT, 2.5 and 
      4.0 mM, and peak. Within the CHO condition: V O2 = 25.0, 32.6, 37.5, 47.2 mL x kg 
      x min(-1); power output = 123.3, 170.7, 200.1, 241.7 W; RPE = 12.8, 15.4, 17.2, 
      19.3; and HR = 137.4, 156.8, 168.7, 187.7 beats x min(-1) at LT, 2.5 mM, 4.0 mM, 
      and peak, respectively. Within PL: V O2 = 24.7, 32.5, 36.8, 45.7 mL x kg x 
      min(-1); power output = 130.0, 175.4, 201.9, 240.0 W; RPE = 12.1, 15.0, 17.0, 
      19.3; and HR = 134.9, 157.9, 169.6, 187.2 beats x min(-1), respectively. In the 
      CHO condition, blood glucose was higher (P < 0.001), and a trend was observed for 
      lower RPE over time (P = 0.07). During the production trials (RPE of 16) in the 
      CHO condition, higher blood glucose area under the curve (AUC) (PL: 204.1 +/- 
      79.3 mM; CHO: 220.6 +/- 18.5 mM; P = 0.039) and a trend for greater total work 
      (PL: 448.5 +/- 73.8 kJ; CHO: 470.5 +/- 65.6 kJ; P = 0.089) were observed. 
      CONCLUSIONS: We conclude that 1) CHO ingestion does not alter the blood 
      lactate-RPE relationship during incremental LT/(.)VO2peak cycling; and 2) 
      carbohydrate supplementation during exercise, eliciting high RPE, may increase 
      work output during training sessions.
FAU - Steiner, Jennifer L
AU  - Steiner JL
AD  - Department of Human Services, University of Virginia, Charlottesville, VA 22904, 
      USA.
FAU - A Curmaci, Alyssa
AU  - A Curmaci A
FAU - Patrie, James T
AU  - Patrie JT
FAU - Gaesser, Glenn A
AU  - Gaesser GA
FAU - Weltman, Arthur
AU  - Weltman A
LA  - eng
GR  - RR00847/RR/NCRR NIH HHS/United States
PT  - Journal Article
PT  - Research Support, N.I.H., Extramural
PL  - United States
TA  - Med Sci Sports Exerc
JT  - Medicine and science in sports and exercise
JID - 8005433
RN  - 0 (Blood Glucose)
RN  - 0 (Dietary Carbohydrates)
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
MH  - Adult
MH  - Bicycling
MH  - *Blood Glucose
MH  - *Dietary Carbohydrates
MH  - *Dietary Supplements
MH  - Ergometry
MH  - *Exercise
MH  - Exercise Test
MH  - *Exercise Tolerance
MH  - Female
MH  - Humans
MH  - *Isometric Contraction
MH  - Lactic Acid/*blood
MH  - Male
MH  - Muscle, Skeletal/*metabolism/physiology
MH  - Prospective Studies
EDAT- 2009/05/23 09:00
MHDA- 2010/09/30 06:00
CRDT- 2009/05/23 09:00
PHST- 2009/05/23 09:00 [entrez]
PHST- 2009/05/23 09:00 [pubmed]
PHST- 2010/09/30 06:00 [medline]
AID - 10.1249/MSS.0b013e3181967637 [doi]
PST - ppublish
SO  - Med Sci Sports Exerc. 2009 Jun;41(6):1326-33. doi: 10.1249/MSS.0b013e3181967637.