Hormonal Responses to Consecutive Days of Heavy-Resistance Exercise With or Without Nutritional Supplementation

J Appl Physiol (1985). 1998 Oct;85(4):1544-55. doi: 10.1152/jappl.1998.85.4.1544.

Abstract

Nine resistance-trained men consumed either a protein-carbohydrate supplement or placebo for 1 wk in a crossover design separated by 7 days. The last 3 days of each treatment, subjects performed resistance exercise. The supplement was consumed 2 h before and immediately after the workout, and blood was obtained before and after exercise (0, 15, 30, 45, and 60 min postexercise). Lactate, growth hormone, and testosterone were significantly (P </= 0.05) elevated immediately postexercise. The lactate response was significantly lower during supplementation on days 2 and 3. Growth hormone and prolactin responses on day 1 were significantly higher during supplementation. After exercise, testosterone declined below resting values during supplementation. Cortisol decreased immediately postexercise on day 1; the response was diminished on days 2 and 3. Glucose and insulin were significantly elevated by 30 min during supplementation and remained stable during placebo. Insulin-like growth factor-I was higher during supplementation on days 2 and 3. These data indicate that protein-carbohydrate supplementation before and after training can alter the metabolic and hormonal responses to consecutive days of heavy-resistance exercise.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Body Composition
  • Cross-Over Studies
  • Dietary Carbohydrates
  • Dietary Proteins
  • Double-Blind Method
  • Energy Intake
  • Food, Fortified*
  • Hormones / blood*
  • Human Growth Hormone / blood
  • Humans
  • Hydrocortisone / blood
  • Insulin / blood
  • Insulin-Like Growth Factor I / metabolism
  • Male
  • Physical Endurance
  • Prolactin / blood
  • Sex Hormone-Binding Globulin / metabolism
  • Testosterone / blood
  • Time Factors
  • Weight Lifting / physiology*

Substances

  • Dietary Carbohydrates
  • Dietary Proteins
  • Hormones
  • Insulin
  • Sex Hormone-Binding Globulin
  • Human Growth Hormone
  • Testosterone
  • Insulin-Like Growth Factor I
  • Prolactin
  • Hydrocortisone