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Edwards, BJ, Boyle, BB, Burniston, JG, Doran, D, Doran, D, Giacomoni, M, Mahon, EA and Pullinger, S (2025) Evidence of a circadian variation in 10-km laboratory running time-trial performance, where a standardised approach has been employed. Chronobiology International. pp. 1-15. ISSN 0742-0528
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2025 CI Edwards et al Evidence of a circadian variation in 10-km laboratory running time-trial performance where a standardised approach has been employed.pdf - Published Version Available under License Creative Commons Attribution Non-commercial. Download (2MB) | Preview |
Abstract
Diurnal variations in time-trial performance have been shown in people living normally, where a "standardised protocol" has been employed to reduce bias. We tested the hypothesis that a circadian variation exists for a 10-km running laboratory-based time-trial, where such a standardised approach is used. Twelve recreationally active adult males were recruited. The participants completed three familiarisation time-trials to the best of their ability at a self-selected pace and six 10-km time-trials at 06:00, 10:00, 14:00, 18:00, 22:00 and 02:00 h. Each session was separated by 7-days. Participants were allocated into 6 groups due to finish times (FT); sessions were counterbalanced in order of administration. A cosine fit for resting intra-aural temperature and FT both showed a significant circadian rhythm (<i>p</i> < 0.05) with mesor, amplitude and acrophases of 36.61°C vs 2994 s, 0.34°C vs 149 s; and 17:29 vs 18:44 h:min, respectively. The parallelism of temperature and FT agrees with previously published research. The finding of a 24-h rhythm in 10-km FT (5.0%, d = 0.80; power = 100%) concurs with that of a shorter distance where "standardised protocols" have been employed (4-km, 2.6%, d = 0.34). This finding has implications for scheduling of competition and training. Whether this variation is apparent in other populations, however, is unclear.
| Item Type: | Article |
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| Uncontrolled Keywords: | 32 Biomedical and Clinical Sciences; 3202 Clinical Sciences; 42 Health Sciences; 06 Biological Sciences; 11 Medical and Health Sciences; Physiology; 31 Biological sciences; 32 Biomedical and clinical sciences; 42 Health sciences |
| Subjects: | R Medicine > RC Internal medicine > RC1200 Sports Medicine |
| Divisions: | Sport and Exercise Sciences |
| Publisher: | Taylor and Francis Group |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 10 Feb 2025 15:20 |
| Last Modified: | 10 Feb 2025 15:30 |
| DOI or ID number: | 10.1080/07420528.2025.2459668 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/25585 |
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