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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| Format: | Article |
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MDPI AG
2021-10-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/21/9962 |
| _version_ | 1797512880114892800 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T06:07:28Z |
| format | Article |
| id | doaj.art-cb1dba90cdba491fabd0446b1d0aa392 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T06:07:28Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-cb1dba90cdba491fabd0446b1d0aa3922023-11-22T20:25:42ZengMDPI AGApplied Sciences2076-34172021-10-011121996210.3390/app11219962Implementing a Circadian Adaptation Schedule after Eastward Flight in Young Male AthletesDean J. Miller0Gregory D. Roach1Michele Lastella2Aaron T. Scanlan3Charli Sargent4The Appleton Institute for Behavioural Science, Central Queensland University, Adelaide, SA 5034, AustraliaThe Appleton Institute for Behavioural Science, Central Queensland University, Adelaide, SA 5034, AustraliaThe Appleton Institute for Behavioural Science, Central Queensland University, Adelaide, SA 5034, AustraliaHuman Exercise and Training Laboratory, School of Health, Medical and Applied Sciences Central Queensland University, Rockhampton, QLD 4700, AustraliaThe Appleton Institute for Behavioural Science, Central Queensland University, Adelaide, SA 5034, AustraliaThis 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.https://www.mdpi.com/2076-3417/11/21/9962jet lagzeitgeberscircadian rhythmstransmeridian travelmelatonin |
| spellingShingle | 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 Applied Sciences jet lag zeitgebers circadian rhythms transmeridian travel melatonin |
| title | 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_short | 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 |
| topic | jet lag zeitgebers circadian rhythms transmeridian travel melatonin |
| url | https://www.mdpi.com/2076-3417/11/21/9962 |
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