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European Journal of Applied Physiology

, Volume 84, Issue 1–2, pp 13–18 | Cite as

The effect of heavy resistance exercise on the circadian rhythm of salivary testosterone in men

  • William J. Kraemer
  • Chad C. Loebel
  • Jeff S. Volek
  • Nicholas A. Ratamess
  • Robert U. Newton
  • Robbin B. Wickham
  • Lincoln A. Gotshalk
  • Noel D. Duncan
  • Scott A. Mazzetti
  • Ana L. Gómez
  • Martyn R. Rubin
  • Bradley C. Nindl
  • Keijo Häkkinen
ORIGINAL ARTICLE

Abstract

Circadian rhythms of serum testosterone concentrations in men have been shown, in general, to be highest in the morning and lowest in the evening. Thus, the purpose of this investigation was to determine the effects of acute resistance exercise upon the waking circadian rhythm of salivary testosterone over 2 days (with or without resistance exercise). The subjects included ten resistance-trained men (with at least 1 year of lifting experience) with the following characteristics [mean (SD)]: age 21.6 (1.1) years; height 177.8 (9.5) cm; body mass 80.5 (11.5) kg; percent body fat 7.9 (1.7)%. A matched, randomized, crossover study design was used such that each subject was tested under both the resistance exercise and control (no exercise) conditions. The resistance exercise protocol consisted of ten exercises performed for three sets of ten repetitions maximum with 2 min of rest between sets. Saliva sample 1 was collected at 0615 hours and resistance exercise began immediately afterwards at approximately 0620 hours, and sample 2 was collected at 0700 hours, which corresponded approximately to a mid-exercise (or control) time point. Saliva samples were then obtained every hour on the hour from 0800 hours until 2200 hours. No significant differences were observed between the exercise and resting conditions for salivary testosterone, with the exception of a significant decrease at 0700 hours during the resistance exercise protocol. The results of this investigation indicate that resistance exercise does not affect the circadian pattern of salivary testosterone secretion over a 16-h waking period in resistance-trained men.

Key words Androgens Chronobiology Testis Weight training 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • William J. Kraemer
    • 1
  • Chad C. Loebel
    • 2
  • Jeff S. Volek
    • 1
  • Nicholas A. Ratamess
    • 1
  • Robert U. Newton
    • 1
  • Robbin B. Wickham
    • 1
  • Lincoln A. Gotshalk
    • 2
  • Noel D. Duncan
    • 3
  • Scott A. Mazzetti
    • 1
  • Ana L. Gómez
    • 1
  • Martyn R. Rubin
    • 1
  • Bradley C. Nindl
    • 5
  • Keijo Häkkinen
    • 4
  1. 1.The Human Performance Laboratory, Ball State University, Muncie, IN 47306, USA e-mail: wkraemer@bsu.edu Tel.: +1-765-2853412; Fax: +1-765-2853238US
  2. 2.Laboratory for Sports Medicine/Center for Sports Medicine, The Pennsylvania State University, University Park, PA 16802, USAUS
  3. 3.Department of Physiology, The University of Melbourne, Melbourne, AustraliaAU
  4. 4.Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, FinlandFI
  5. 5.Occupational Physiology Division, U.S. Army Research Institute of Environmental Medicine, Natick, Mass., USAUS

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