The relationship between serum and salivary cortisol levels in response to different intensities of exercise

The effect of exercise intensity on the tracking of serum and salivary cortisol responses was examined in 12 endurance-trained males (maximal oxygen uptake [VO2max] = 58.2 ± 6.4 mL/kg/min). Subjects rested for 30 min (control) and exercised on a cycle ergometer for 30 min at 40% (low), 60% (moderate...

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Bibliographic Details
Published in:International journal of sports physiology and performance 2011-09, Vol.6 (3), p.396-407
Main Authors: VanBruggen, Mitch D, Hackney, Anthony C, McMurray, Robert G, Ondrak, Kristin S
Format: Article
Language:English
Subjects:
Adolescent
Adult
Analysis of Variance
Bicycling
Biomarkers - blood
Biomarkers - metabolism
Exercise
Exercise Test
Hormones
Humans
Hydrocortisone - blood
Hydrocortisone - metabolism
Male
North Carolina
Oxygen Consumption
Physical Endurance
Recovery of Function
Saliva - metabolism
Time Factors
Up-Regulation
Young Adult
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Summary:The effect of exercise intensity on the tracking of serum and salivary cortisol responses was examined in 12 endurance-trained males (maximal oxygen uptake [VO2max] = 58.2 ± 6.4 mL/kg/min). Subjects rested for 30 min (control) and exercised on a cycle ergometer for 30 min at 40% (low), 60% (moderate), and 80% (high intensity) of VO2max on separate days. Serum and saliva samples were collected pretrial, immediately posttrial, and 30 min into the recovery period from each trial. Cortisol responses increased significantly for both serum (40.4%; P = .001) and saliva (170.6%; P = .007) only in response to high-intensity exercise. Peak saliva cortisol occurred at 30 min of recovery, whereas peak serum was at the immediate posttrial sampling time point. The association between serum and saliva cortisol across all trials was examined using concordance correlation (Rc) analysis, which accounts for repeated measures. The overall correlation between serum and saliva cortisol levels in all matched samples was significant (Rc = 0.728; P = .001). The scatter plot revealed that salivary cortisol responses tracked closely to those of serum at lower concentrations, but not as well at higher concentrations. Findings suggest salivary measurements of cortisol closely mirror those in the serum and that peak salivary concentrations do not occur until at least 30 min into the recovery from intense exercise.
ISSN:1555-0265
1555-0273
DOI:10.1123/ijspp.6.3.396