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Related Experiment Video

Updated: May 15, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
07:40

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training

Published on: October 10, 2019

Testosterone responses to intensive interval versus steady-state endurance exercise.

A C Hackney1, K P Hosick, A Myer

  • 1Department of Exercise & Sport Science, University of North Carolina, Chapel Hill, North Carolina 27599-8700, USA. ach@email.unc.edu

Journal of Endocrinological Investigation
|January 12, 2013
PubMed
Summary

High-intensity interval exercise (IE) and steady-state endurance exercise (SSE) both increase free testosterone (FT). However, IE may lead to greater FT turnover in androgen-sensitive tissues compared to SSE.

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Last Updated: May 15, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
07:26

Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans

Published on: October 17, 2018

Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Sports Science

Background:

  • Understanding hormonal responses to different exercise intensities is crucial for optimizing training.
  • Free testosterone (FT) plays a key role in androgenic effects and muscle adaptation.
  • Endurance-trained males were studied to assess hormonal differences between exercise protocols.

Purpose of the Study:

  • To compare the effects of high-intensity interval exercise (IE) and steady-state endurance exercise (SSE) on free testosterone (FT) and related hormonal markers.
  • To investigate the potential differences in FT turnover and androgen metabolism between IE and SSE.
  • To evaluate the impact of exercise intensity on hormonal profiles in endurance-trained athletes.

Main Methods:

  • Participants completed three separate sessions: IE, SSE, and a control (CON).
  • IE involved intervals of high-intensity running (100-110% VO2max) with active recovery.
  • SSE involved continuous moderate-intensity running (60-65% VO2max) for 45 minutes.

Main Results:

  • Both IE and SSE significantly increased FT levels post-exercise compared to CON.
  • IE induced a more pronounced increase in FT than SSE.
  • The 5α-reductase marker, 3-α-androstanediol glucuronide (3-α Diol G), was elevated 12 hours post-IE, suggesting increased FT turnover, which was not observed after SSE.

Conclusions:

  • High-intensity interval exercise may stimulate a greater turnover of free testosterone in androgen-sensitive tissues compared to steady-state endurance exercise.
  • Both exercise modalities impact FT, but IE appears to elicit a more significant acute hormonal response and subsequent metabolic activity.
  • These findings have implications for exercise prescription and understanding hormonal adaptations in athletes.