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Hough, J. 
ORCID: 0000-0001-6970-5779, Leal, D., Scott, G., Taylor, L., Townsend, D. and Gleeson, M.,
2021.
Reliability of salivary cortisol and testosterone to a high-intensity cycling protocol to highlight overtraining.
Journal of Sports Sciences, pp. 1-7.
ISSN 0264-0414
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Abstract
Athletes physically overload to improve performance. Unbalanced stress/recovery may induce overtraining, which is difficult to diagnosis as no diagnostic marker exists. Hormonal responses to a 55/80 cycle (30-min of alternating blocks of 1-min at 55% and 4-min at 80% maximum work rate) may highlight early-stage overtraining (overreaching), as blunted cortisol and testosterone responses to 55/80 follows intensified training. However, the reliability of hormonal responses to 55/80 when not overreached is unknown. Therefore, reported blunted hormonal responses could be due to inconsistent cortisol and testosterone responses to 55/80. Participants (n = 23) completed three 55/80 bouts, >7 days apart, with no exercise 24 h pre-trials. Pre-exercise urine osmolality and stress questionnaire responses were measured. Pre, post, and 30-min post-exercise saliva samples were collected for cortisol and testosterone assessment. Salivary cortisol and testosterone responses, osmolality and well-being were not different between trials. Salivary cortisol and testosterone elevated from pre- to post-exercise [by 4.2 nmol.L−1 (cortisol) and 307 pmol.L−1 (testosterone)], and 30 min post-exercise [by 160 pmol.L−1 (testosterone) only]. Intraclass correlation coefficients for pre to peak post-exercise cortisol (0.89; good) and testosterone (0.53; moderate) were calculated. This demonstrates that 55/80 induces reliable elevations of salivary cortisol and testosterone when in a healthy state.
| Item Type: | Journal article | ||||||
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| Publication Title: | Journal of Sports Sciences | ||||||
| Creators: | Hough, J., Leal, D., Scott, G., Taylor, L., Townsend, D. and Gleeson, M. | ||||||
| Publisher: | Informa UK Limited | ||||||
| Date: | 27 April 2021 | ||||||
| ISSN: | 0264-0414 | ||||||
| Identifiers: |
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| Divisions: | Schools > School of Science and Technology | ||||||
| Record created by: | Laura Ward | ||||||
| Date Added: | 04 May 2021 10:50 | ||||||
| Last Modified: | 27 Apr 2022 03:00 | ||||||
| Related URLs: | |||||||
| URI: | https://irep.ntu.ac.uk/id/eprint/42802 |
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