Testosterone and Cortisol in Relationship to Dietary Nutrients and Resistance Exercise

J Appl Physiol (1985). 1997 Jan;82(1):49-54. doi: 10.1152/jappl.1997.82.1.49.

Abstract

Manipulation of resistance exercise variables (i.e., intensity, volume, and rest periods) affects the endocrine response to exercise; however, the influence of dietary nutrients on basal and exercise-induced concentrations of hormones is less understood. The present study examined the relationship between dietary nutrients and resting and exercise-induced blood concentrations of testosterone (T) and cortisol (C). Twelve men performed a bench press exercise protocol (5 sets to failure using a 10-repetitions maximum load) and a jump squat protocol (5 sets of 10 repetitions using 30% of each subject's 1-repetition maximum squat) with 2 min of rest between all sets. A blood sample was obtained at preexercise and 5 min postexercise for determination of serum T and C. Subjects also completed detailed dietary food records for a total of 17 days. There was a significant (P < or = 0.05) increase in postexercise T compared with preexercise values for both the bench press (7.4%) and jump squat (15.1%) protocols; however, C was not significantly different from preexercise concentrations. Significant correlations were observed between preexercise T and percent energy protein (r = -0.71), percent energy fat (r = 0.72), saturated fatty acids (g.1,000 kcal-1.day-1; r = 0.77), monounsaturated fatty acids (g.1,000 kcal-1.day-1; r = 0.79, the polyunsaturated fat-to-saturated fat ratio (r = -0.63), and the protein-to-carbohydrate ratio (r = -0.59). There were no significant correlations observed between any nutritional variables and preexercise C or the absolute increase in T and C after exercise. These data confirm that high-intensity resistance exercise results in elevated postexercise T concentrations. A more impressive finding was that dietary nutrients may be capable of modulating resting concentrations of T.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Dietary Carbohydrates / pharmacology*
  • Dietary Fats / pharmacology*
  • Dietary Proteins / pharmacology*
  • Energy Metabolism / drug effects
  • Exercise / physiology*
  • Humans
  • Hydrocortisone / blood*
  • Male
  • Testosterone / blood*

Substances

  • Dietary Carbohydrates
  • Dietary Fats
  • Dietary Proteins
  • Testosterone
  • Hydrocortisone