PMID- 9763796
OWN - NLM
STAT- MEDLINE
DCOM- 19981021
LR  - 20170126
IS  - 0022-4707 (Print)
IS  - 0022-4707 (Linking)
VI  - 38
IP  - 2
DP  - 1998 Jun
TI  - Effect of lactate consumption on exercise performance.
PG  - 116-23
AB  - BACKGROUND: Maintenance of plasma glucose is important in endurance performance. 
      Gluconeogenesis or carbohydrate ingestion maintain glucose after hepatic glycogen 
      depletion. Lactate may also serve as a gluconeogenic precursor as well as a blood 
      buffer. METHODS: To determine if an 8% carbohydrate (CHO) sports drink with and 
      without a 2% lactate (L) solution increased endurance performance, peak power, 
      and delayed blood acidosis, seven trained cyclists participated in a double-blind 
      randomized study (6 males and 1 female) performed a bicycle test to determine max 
      VO2max HR and the HR associated with the first respiratory exchange ratio (RER) 
      value greater than 1.0 (target HR). Four bicycle rides to exhaustion, separated 
      by one week, were done at a constant workload at a HR 10 beats below each 
      subject's target HR. After a 12-hour fast, subjects received 100 g CHO 2-3 hrs 
      before each test. Mean exercise heart rate was 86-87% max HR. During the final 30 
      s of each ride the Wingate power test was performed. Subjects consumed either 
      (placebo, 2% L, 8% CHO or 8% CHO plus 2% L) every 20 min. Blood samples were 
      collected before, every 30 min during and immediately following the test. 
      RESULTS: No significant differences were observed in total time (placebo: 95.3 
      +/- 25.8, 2% lactate: 95.7 +/- 30.0, 8% CHO: 105.2 +/- 37.2, 8% CHO + 2% lactate: 
      89.0 +/- 28.1 min) or peak power (placebo: 798.2 +/- 241.1, 2% L: 750.1 +/- 
      279.2, 8% CHO: 789.4 +/- 353.5, 8% CHO + 2% L: 716.3 +/- 331.3 Watts) among 
      drinks. There were no differences in insulin, glucose, pH and HCO3- after the 
      power tests among the drinks. CONCLUSION: Exercise performance is unaffected by 
      oral supplementation with lactate.
FAU - Bryner, R W
AU  - Bryner RW
AD  - Department of Exercise Physiology, Morgantown, WV 26506-6116, USA.
FAU - Hornsby, W G
AU  - Hornsby WG
FAU - Chetlin, R
AU  - Chetlin R
FAU - Ullrich, I H
AU  - Ullrich IH
FAU - Yeater, R A
AU  - Yeater RA
LA  - eng
PT  - Clinical Trial
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - Italy
TA  - J Sports Med Phys Fitness
JT  - The Journal of sports medicine and physical fitness
JID - 0376337
RN  - 0 (Blood Glucose)
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
MH  - Blood Glucose/analysis
MH  - *Dietary Supplements
MH  - Double-Blind Method
MH  - Exercise/*physiology
MH  - Exercise Test
MH  - Female
MH  - Humans
MH  - Lactic Acid/*pharmacology
MH  - Male
MH  - *Oxygen Consumption
MH  - Physical Endurance/physiology
MH  - Respiration
EDAT- 1998/10/09 00:00
MHDA- 1998/10/09 00:01
CRDT- 1998/10/09 00:00
PHST- 1998/10/09 00:00 [pubmed]
PHST- 1998/10/09 00:01 [medline]
PHST- 1998/10/09 00:00 [entrez]
PST - ppublish
SO  - J Sports Med Phys Fitness. 1998 Jun;38(2):116-23.