Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes

This study examined the effectiveness of a circadian adaptation schedule in male cricketers after an 8.5 h eastward time zone change. Ten participants (aged 18.7 ± 0.9 y) were randomly assigned to a control group or an intervention group. Participants in the intervention group followed a light expos...

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Autores principales:	Dean J. Miller, Gregory D. Roach, Michele Lastella, Aaron T. Scanlan, Charli Sargent
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	jet lag zeitgebers circadian rhythms transmeridian travel melatonin Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/cb1dba90cdba491fabd0446b1d0aa392
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spelling	oai:doaj.org-article:cb1dba90cdba491fabd0446b1d0aa3922021-11-11T15:03:00ZImplementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes10.3390/app112199622076-3417https://doaj.org/article/cb1dba90cdba491fabd0446b1d0aa3922021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9962https://doaj.org/toc/2076-3417This study examined the effectiveness of a circadian adaptation schedule in male cricketers after an 8.5 h eastward time zone change. Ten participants (aged 18.7 ± 0.9 y) were randomly assigned to a control group or an intervention group. Participants in the intervention group followed a light exposure schedule in which they were instructed to seek light in the three hours preceding, and avoid light in the three hours following their estimated core body temperature minimum. The rate of adaptation was assessed using the nightly excretion rate of urinary 6-sulphatoxymelatonin (aMT6s). General linear mixed models were conducted to assess the effect of condition (i.e., control and light intervention) on nocturnal secretion of aMT6s. Significant main effects of day (<i>F(7, 35) = 10.4</i>, <i>p</i> < 0.001) were reflected by an increase in nocturnal melatonin excretion (i.e., all participants gradually adapted to the destination time zone). Subjective jet lag decreased by day (<i>F(7, 54) = 22.9</i>, <i>p</i> < 0.001), bedtime was delayed by day <i>(F(7, 54) = 3.1</i>, <i>p</i> = 0.007) and get up time was earlier by day <i>(F(7, 35) = 5.4</i>, <i>p</i> < 0.001). On average, it took 7 days for all participants to return to baseline levels following transmeridian travel. Similarly, it took 7 days for subjective jet lag to alleviate. In the initial 4 days of the protocol, the intervention group registered higher levels of nocturnal urinary melatonin, however, there was no significant differences in the rate of adaptation between the groups. It is possible that participants did not adhere to the intervention or that they followed the intervention but it was ineffective.Dean J. MillerGregory D. RoachMichele LastellaAaron T. ScanlanCharli SargentMDPI AGarticlejet lagzeitgeberscircadian rhythmstransmeridian travelmelatoninTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9962, p 9962 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	jet lag zeitgebers circadian rhythms transmeridian travel melatonin Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	jet lag zeitgebers circadian rhythms transmeridian travel melatonin Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Dean J. Miller Gregory D. Roach Michele Lastella Aaron T. Scanlan Charli Sargent Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes
description	This study examined the effectiveness of a circadian adaptation schedule in male cricketers after an 8.5 h eastward time zone change. Ten participants (aged 18.7 ± 0.9 y) were randomly assigned to a control group or an intervention group. Participants in the intervention group followed a light exposure schedule in which they were instructed to seek light in the three hours preceding, and avoid light in the three hours following their estimated core body temperature minimum. The rate of adaptation was assessed using the nightly excretion rate of urinary 6-sulphatoxymelatonin (aMT6s). General linear mixed models were conducted to assess the effect of condition (i.e., control and light intervention) on nocturnal secretion of aMT6s. Significant main effects of day (<i>F(7, 35) = 10.4</i>, <i>p</i> < 0.001) were reflected by an increase in nocturnal melatonin excretion (i.e., all participants gradually adapted to the destination time zone). Subjective jet lag decreased by day (<i>F(7, 54) = 22.9</i>, <i>p</i> < 0.001), bedtime was delayed by day <i>(F(7, 54) = 3.1</i>, <i>p</i> = 0.007) and get up time was earlier by day <i>(F(7, 35) = 5.4</i>, <i>p</i> < 0.001). On average, it took 7 days for all participants to return to baseline levels following transmeridian travel. Similarly, it took 7 days for subjective jet lag to alleviate. In the initial 4 days of the protocol, the intervention group registered higher levels of nocturnal urinary melatonin, however, there was no significant differences in the rate of adaptation between the groups. It is possible that participants did not adhere to the intervention or that they followed the intervention but it was ineffective.
format	article
author	Dean J. Miller Gregory D. Roach Michele Lastella Aaron T. Scanlan Charli Sargent
author_facet	Dean J. Miller Gregory D. Roach Michele Lastella Aaron T. Scanlan Charli Sargent
author_sort	Dean J. Miller
title	Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes
title_short	Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes
title_full	Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes
title_fullStr	Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes
title_full_unstemmed	Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes
title_sort	implementing a circadian adaptation schedule after eastward flight in young male athletes
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cb1dba90cdba491fabd0446b1d0aa392
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Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male Athletes

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