Hormonal responses to endurance training and overtraining in female athletes

Clin J Sport Med. 1998 Jul;8(3):178-86. doi: 10.1097/00042752-199807000-00004.


Objective: To examine different hormonal responses to heavy endurance training and overtraining in female athletes.

Design: Submaximal and maximal treadmill tests, self-report mood measures, and stress hormone analyses were repeated at baseline, after 4 weeks and at the end of 6 to 9 weeks of experimental intensive training and after 4 to 6 weeks of recovery.

Subjects: Fifteen healthy female endurance athletes increased their intensive training volume by 130% and base training volume by 100% (ETG, n = 9) or served as controls (CG, n = 6).

Main outcome measures: Maximal oxygen uptake (VO2max), mood dynamics, blood catecholamines, cortisol and testosterone at rest and after submaximal and maximal exercise, and nocturnal urine catecholamines.

Results: Five females from the ETG demonstrated an over-training state (OA subgroup) at the end of the training period. Their VO2max decreased (mean +/- SEM) from 53.0 +/- 2.2 ml.kg-1.min-1 (range, 46.8-59.2) to 50.2 +/- 2.3 ml.kg-1.min-1 (range, 43.8-56.6) (p < 0.01). Maximal treadmill performance expressed as oxygen demand decreased (mean +/- SEM) from 56.0 +/- 1.6 ml.kg-1.min-1 (range, 51.5-60.5) to 52.2 +/- 1.1 ml kg-1.min-1 (range, 49.1-55.3) (p < 0.01). Maximal heart rate also decreased (mean +/- SEM) from 190 +/- 1 bpm (range, 185-197) to 186 +/- 2 bpm (range, 184-193) (p < 0.05), and the athletes experienced mood disturbances. Plasma adrenaline levels at maximal and noradrenaline at submaximal work rate decreased during the last 2 to 5 training weeks (p < 0.05), and serum cortisol levels at maximal work rate decreased during the first 4 training weeks (p < 0.05) in the ETG. Plasma adrenaline at maximal work rate decreased during the first 4 training weeks (p < 0.05) in the OA subgroup. There were no changes in the CG. Individual hormonal response types to heavy training and overtraining were found.

Conclusions: Hormone responses to exercise load are superior in indicating heavy training-induced stress when compared with resting hormone levels. These responses indicated decreased sympathoadrenal and/or adrenocortical activity (or exhaustion of the adrenal gland or the central nervous system). Individual hormonal profiles are needed to follow up training effects. Marked individual differences were found in training- and overtraining-induced hormonal changes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Epinephrine / blood*
  • Exercise Test
  • Female
  • Humans
  • Hydrocortisone / blood*
  • Norepinephrine / blood*
  • Physical Endurance / physiology*
  • Sports / physiology*
  • Testosterone / blood*


  • Testosterone
  • Hydrocortisone
  • Norepinephrine
  • Epinephrine