Effect of exercise intensity on free tryptophan to branched-chain amino acids ratio and plasma prolactin during endurance exercise

Heiko Klaus Strüder, W Hollmann, P Platen, R Wöstmann, A Ferrauti, Karl Weber

Publication: Contribution to journalJournal articlesResearchpeer-review

Abstract

The potential of exercise-induced changes in peripheral amino acids to alter blood prolactin levels through a serotonergic system modification was investigated in 8 male athletes. In two trials, subjects (N = 8) exercised on a cycle ergometer for 5 hr. The intensity of exercise corresponded to 55% VO2max (T55) or 75% VO2max (T75), respectively. In each trial, each subject received a 25-g energy bar (111 kcal) every 60 min, as well as 300 ml of a 6% carbohydrate solution (90 kcal) every 30 min of exercise duration. Plasma glucose and insulin declined (p < or = .05) in both trials during exercise. Ammonia was augmented (p < or = .05) above the baseline concentration after 120 min in both trials. During the last 2 hr of exercise, plasma free fatty acids were higher (p < or = .05) in T75 than in T55. During this time, the plasma free TRP/BCAA ratio was also augmented (p < or = .05) in T75, while no change was induced in T55. Plasma prolactin did not change in T55, while an increase (p < or = .05) was found in T75. The findings may further support the hypothesis that during endurance exercise changes in peripheral amino acid concentration may influence prolactin response via serotonergic system modifications.

Original languageEnglish
JournalCanadian journal of applied physiology = Revue canadienne de physiologie appliquée
Volume22
Issue number3
Pages (from-to)280-291
Number of pages12
ISSN1066-7814
Publication statusPublished - 01.06.1997

Research areas and keywords

  • Adult
  • Amino Acids, Branched-Chain
  • Ammonia
  • Blood Gas Analysis
  • Blood Glucose
  • Blood-Brain Barrier
  • Chromatography, High Pressure Liquid
  • Exercise
  • Exercise Test
  • Exercise Tolerance
  • Fatty Acids, Nonesterified
  • Heart Rate
  • Humans
  • Insulin
  • Male
  • Prolactin
  • Tryptophan

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