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Adding polylactate to a glucose polymer solution does not improve endurance

T Swensen1, G Crater, D R Bassett

  • 1Department of Zoology, University of Tennessee, Knoxville 37996.

International Journal of Sports Medicine
|October 1, 1994
PubMed
Summary
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Polylactate (PL) supplementation with glucose polymers (GP) did not enhance endurance exercise performance. This study found no measurable physiological or performance benefits from adding PL to a GP solution for athletes.

Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutritional Supplementation

Background:

  • Polylactate (PL) is a novel carbohydrate supplement claimed to improve endurance.
  • Understanding the efficacy of PL in combination with glucose polymers (GP) is crucial for athletic performance.

Purpose of the Study:

  • To investigate if adding Polylactate (PL) to a glucose polymer (GP) solution enhances exercise duration compared to a GP-only solution.
  • To assess the physiological effects of PL supplementation during endurance exercise.

Main Methods:

  • Double-blind, randomized crossover study with 5 participants exercising to exhaustion at 70% VO2max.
  • Participants consumed either a GP solution or a GP/PL mixture (0.3 g carbohydrate/kg body weight every 20 min).
  • Physiological parameters (VO2, RER, HR, perceived exertion, serum glucose, insulin, FFAs, glycerol, blood lactate, pH) were monitored.

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Main Results:

  • The addition of Polylactate (PL) to a glucose polymer (GP) solution demonstrated no significant impact on exercise time to exhaustion.
  • No measurable physiological differences were observed between the GP and GP/PL mixture conditions.
  • Gastrointestinal distress was noted at higher PL concentrations, necessitating a low tolerable concentration (≤0.75%).

Conclusions:

  • Polylactate (PL) supplementation, when combined with glucose polymers (GP), does not appear to offer ergogenic benefits for endurance exercise.
  • Further research may be needed to explore different formulations or dosages, but current findings suggest limited efficacy.