Diurnal variation of cortisol, testosterone, and their ratio in apparently healthy males

Lawrence D. Hayes, Fergal M. Grace, J. Lon Kilgore, John D. Young, Julien S. Baker

Research output: Contribution to journalArticle

Abstract

The aim of the present study was to investigate whether a certain time of day may be more or less catabolic or anabolic than another and therefore of greater adaptive potential after exercise. Eighteen male university students volunteered to participate in the study. Salivary specimens were collected every 60 min over a 12 h waking period and then measured with the Salimetrics HS-cortisol assay and Salimetrics HS-testosterone assay. Participants remained at rest and were fed identical meals to each other at 08:05, 13:05, and 18:05 h. Blood pressure, heart rate and core temperature were observed every 15 min. Elevated cortisol concentrations were observed in the morning between 08:00 and 09:00 h (mean concentration ± SD = 0.28 ± 0.17 ug/dL) and a nadir in the evening or early night-time, between 17:00 and 20:00 h (mean concentration ± SD = 0.12 ± 0.06 ug/dL). Post hoc analysis revealed that mean 08:00 h cortisol was significantly greater than mean cortisol at 11:00 to 20:00 h (P < 0.05) and mean 09:00 h cortisol was significantly greater than mean cortisol from 15:00 to 20:00 h (P < 0.05). However, testosterone did not change significantly during the same period. Cortisol, core temperature and systolic blood pressure correlated significantly (although not strongly) with sampling time. In conclusion, salivary sampling to assess the anabolic/catabolic status of a squad or individual or to diagnose overtraining may not be simple or feasible as the variation between individuals is high and therefore setting a threshold value would prove troublesome. Also, the episodic release of cortisol in particular increases the difficulty of deciding a value in healthy or subclinical individuals.
Original languageEnglish
Pages (from-to)5-13
Number of pages9
JournalSport Scientific and Practical Aspects: International Scientific Journal of Kinesiology
Volume9
Issue number1
Publication statusPublished - 1 Jun 2012

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Hydrocortisone
Testosterone
Blood Pressure
Temperature
Meals
Heart Rate
Exercise
Students

Keywords

  • anabolism
  • catabolism
  • biological variation
  • circadian rhythms

Cite this

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abstract = "The aim of the present study was to investigate whether a certain time of day may be more or less catabolic or anabolic than another and therefore of greater adaptive potential after exercise. Eighteen male university students volunteered to participate in the study. Salivary specimens were collected every 60 min over a 12 h waking period and then measured with the Salimetrics HS-cortisol assay and Salimetrics HS-testosterone assay. Participants remained at rest and were fed identical meals to each other at 08:05, 13:05, and 18:05 h. Blood pressure, heart rate and core temperature were observed every 15 min. Elevated cortisol concentrations were observed in the morning between 08:00 and 09:00 h (mean concentration ± SD = 0.28 ± 0.17 ug/dL) and a nadir in the evening or early night-time, between 17:00 and 20:00 h (mean concentration ± SD = 0.12 ± 0.06 ug/dL). Post hoc analysis revealed that mean 08:00 h cortisol was significantly greater than mean cortisol at 11:00 to 20:00 h (P < 0.05) and mean 09:00 h cortisol was significantly greater than mean cortisol from 15:00 to 20:00 h (P < 0.05). However, testosterone did not change significantly during the same period. Cortisol, core temperature and systolic blood pressure correlated significantly (although not strongly) with sampling time. In conclusion, salivary sampling to assess the anabolic/catabolic status of a squad or individual or to diagnose overtraining may not be simple or feasible as the variation between individuals is high and therefore setting a threshold value would prove troublesome. Also, the episodic release of cortisol in particular increases the difficulty of deciding a value in healthy or subclinical individuals.",
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Diurnal variation of cortisol, testosterone, and their ratio in apparently healthy males. / Hayes, Lawrence D.; Grace, Fergal M.; Kilgore, J. Lon; Young, John D.; Baker, Julien S.

In: Sport Scientific and Practical Aspects: International Scientific Journal of Kinesiology, Vol. 9, No. 1, 01.06.2012, p. 5-13.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Diurnal variation of cortisol, testosterone, and their ratio in apparently healthy males

AU - Hayes, Lawrence D.

AU - Grace, Fergal M.

AU - Kilgore, J. Lon

AU - Young, John D.

AU - Baker, Julien S.

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AB - The aim of the present study was to investigate whether a certain time of day may be more or less catabolic or anabolic than another and therefore of greater adaptive potential after exercise. Eighteen male university students volunteered to participate in the study. Salivary specimens were collected every 60 min over a 12 h waking period and then measured with the Salimetrics HS-cortisol assay and Salimetrics HS-testosterone assay. Participants remained at rest and were fed identical meals to each other at 08:05, 13:05, and 18:05 h. Blood pressure, heart rate and core temperature were observed every 15 min. Elevated cortisol concentrations were observed in the morning between 08:00 and 09:00 h (mean concentration ± SD = 0.28 ± 0.17 ug/dL) and a nadir in the evening or early night-time, between 17:00 and 20:00 h (mean concentration ± SD = 0.12 ± 0.06 ug/dL). Post hoc analysis revealed that mean 08:00 h cortisol was significantly greater than mean cortisol at 11:00 to 20:00 h (P < 0.05) and mean 09:00 h cortisol was significantly greater than mean cortisol from 15:00 to 20:00 h (P < 0.05). However, testosterone did not change significantly during the same period. Cortisol, core temperature and systolic blood pressure correlated significantly (although not strongly) with sampling time. In conclusion, salivary sampling to assess the anabolic/catabolic status of a squad or individual or to diagnose overtraining may not be simple or feasible as the variation between individuals is high and therefore setting a threshold value would prove troublesome. Also, the episodic release of cortisol in particular increases the difficulty of deciding a value in healthy or subclinical individuals.

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KW - catabolism

KW - biological variation

KW - circadian rhythms

M3 - Article

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EP - 13

JO - Sport Scientific and Practical Aspects: International Scientific Journal of Kinesiology

JF - Sport Scientific and Practical Aspects: International Scientific Journal of Kinesiology

SN - 1840-4413

IS - 1

ER -