- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05162105
Quick Returns - Sleep, Cognitive Functions and Individual Differences
Quick Returns - Sleep, Cognitive Functions and Individual Differences: An Experimental Approach
Study Overview
Status
Conditions
Detailed Description
Rotating shift workers may have a narrow time window to rest after an evening shift, before returning early to work for a day shift. In the literature, a rest opportunity of less than 11 hours between two consecutive shifts, is defined as a Quick Return (QR). Most often, this is occurs when working an evening shift followed by a day shift. Survey- and longitudinal studies have found associations between QRs and an increased risk of being involved in occupational accidents. However, no studies have experimentally investigated how a QR scenario may affect performance at work and sleep between the two shifts. Thus, the project will experimentally simulate QRs, where a battery of cognitive tests will be administered in a laboratory to indicate performance. Objective and subjective sleep will be measured/reported at home where participants normally sleep. Additionally, genotype- and personality trait data will be collected and used as moderators in the analyses.
A randomized cross-over design with two groups will be applied. In one condition, participants will work an evening shift (03:00PM-11:00PM) followed by a day shift (07:00AM-03:00PM, QR). In the other condition, participants work a day shift (07:00AM-03:00PM) followed by another day shift. Four weeks later after being in one of the conditions, the participants will return to the laboratory and work in the opposite condition. Sleep will be subjectively reported with a sleep diary and objectively measured using a low-powered ultra-wideband radar, two days before and between the two simulated shifts in each of the two conditions.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Bergen, Norway
- University of Bergen, Department of Psychosocial Science
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Participants are physically and mentally healthy (assessed with BMI and 'General Health Questionnaire-12)'.
- Participants accept to comply to the protocol (retain regular bed- and wake times before the simulated shifts).
- Refrain from alcohol and maintain regular nicotine and caffeine usage during participation.
- Norwegian as primary language/proficiency in Norwegian language.
Exclusion Criteria:
- Neurological, psychiatric or sleep related disorders ('Bergen Insomnia Scale, 'Global sleep assessment questionnaire').
- Extreme 'morning-eveningness' type ('Horne-Östberg).
- Use of medication that affect sleep or cognitive performance.
- Pregnancy.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Experimental: Evening shift followed by day shift (Quick Return)
Participants work a simulated evening shift, from 03:00PM to 11:00PM, followed by a simulated day shift, 07:00AM to 03:00PM, the following day.
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Participants will have shortened rest opportunity (8 hours) between two consecutive shifts, due to the shift work schedule.
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Active Comparator: Day shift followed by day shift
Participants work a simulated day shift, from 07:00AM to 03:00PM, followed by another simulated day shift, from 07:00AM to 03:00PM, the following day.
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Participants will have a 16 hour rest opportunity between shifts, due to shift work schedule.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
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Sustained Attention
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Sustained attention will be measured using the Psychomotor Vigilance Test (PVT).
The PVT is a commonly used test to assess the effect of sleep deprivation on cognitive functioning.
The test will be conducted every 1.5h - 2h during simulated shifts, in total five times during the day shift (07:30AM, 09:00AM,10:30AM, 12:30PM and 02:30PM) and five times during the evening shift (03:30PM, 05:00PM, 6:30PM, 8:30PM and 10:30PM).
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Sleep Onset Latency'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'sleep onset latency' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Sleep Onset Latency in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Total Sleep Time'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'total sleep time' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy).
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Total Sleep Time in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Time in Light Sleep'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'time in light sleep' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Time in Light Sleep in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Time in Deep Sleep'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'time in deep sleep' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Time in Deep Sleep in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Time in Rapid Eye Movement(REM)-sleep'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'time in REM-sleep' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Time in Rapid Eye Movement(REM)-sleep in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Sleepiness
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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The Karolinska Sleepiness Scale (KSS) is a single item question measuring sleepiness on a likert scale from 1 - 9 ('1' - "Extremely alert" to '9' - "Very sleepy/fighting sleep").
The test will be conducted every 1.5h - 2h during simulated shifts, in total five times during the day shift (07:30AM, 09:00AM,10:30AM, 12:30PM and 02:30PM) and five times during the evening shift (03:30PM, 05:00PM, 6:30PM, 8:30PM and 10:30PM).
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Bedtime'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'bedtime' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Bedtime in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Sleep Efficiency'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'sleep efficiency' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Sleep Efficiency in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Wake after sleep onset'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'wake after sleep onset' will be objectively measured using a low-powered ultra -wideband Xethru sleep radar (Somnofy), placed next to the bed.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Wake after sleep onset in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Subjective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Bedtime'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'bedtime' is reported in a sleep diary.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Bedtime in the two sleep opportunities between will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Subjective Sleep,one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Sleep Onset Latency'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'sleep onset latency' is reported in a sleep diary.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Sleep Onset Latency in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Subjective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Sleep Efficiency'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'sleep efficiency' is reported in a sleep diary.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Sleep efficiency in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Subjective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Wake After Sleep Onset'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'wake after sleep onset' is reported in a sleep diary.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Wake after sleep onset in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Subjective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Total Sleep Time'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'total sleep time' is reported in a sleep diary.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Total sleep time in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Subjective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Sleep Quality'
Time Frame: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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To evaluate the effect of simulated short rest between two shifts (QR) on sleep, 'sleep quality' is reported in a sleep diary.
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Sleep quality in the two sleep opportunities will be compared.
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Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
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Arousal prior to bedtime - one night between two day shifts versus one night between evening- followed by day shift
Time Frame: Prior to bedtime the night between the two shifts in the QR condition (from 11PM-7AM) compared to the night between two shifts in the control condition (from 3PM-7AM).
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Pre-Sleep Arousal Scale (PSAS) will be used to examine if participants differ in arousal-level at bedtime in the two sleep opportunities.
PSAS contains 16 items, each being rated on a 5-point likert scale from 1 to 5 ('1' - "Not at all" to '5' - "Extremely").
Sleep opportunity will in the QR-condition be between 11PM-7AM and in the control-condition between 3PM-7AM, as a consequence of simulated shift schedule (QR-condition; first shift on day 1 occurring 3PM-11PM & second shift on day 2 occurring 7AM-3PM.
Control-condition; first shift on day 1 occurring 7AM-3PM & second shift on day 2 occurring 7AM-3PM the following day).
Arousal at bedtime in the two sleep opportunities in each condition will between will be compared.
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Prior to bedtime the night between the two shifts in the QR condition (from 11PM-7AM) compared to the night between two shifts in the control condition (from 3PM-7AM).
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Mood/Affect
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Mood/affect is measured using the Positive and Negative Affect Scale (PANAS).
PANAS contains 20 items.
Each item is rated on a likert scale from 1 to 5 ('1' - None" and '5' - Extremely").
The test will be conducted every 1.5h - 2h during simulated shifts, in total five times during the day shift (07:30AM, 09:00AM,10:30AM, 12:30PM and 02:30PM) and five times during the evening shift (03:30PM, 05:00PM, 6:30PM, 8:30PM and 10:30PM).
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Moral Decision
Time Frame: Difference between day 2, in simulated QR (evening- followed by day shift) and day 2 in the control condition (day- followed by day shift). Day 2 in QR- and control combination: 7AM-3PM.
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The Defining Issue Test (DIT-2) will be used to evaluate the effect of simulated short rest between two shifts (QR) on morality (decision making).
DIT-2 presents five moral dilemmas where participants rate and rank issues surrounding the dilemmas on a likert scale from 1 to 5 ('1' - "Very important" to '5' - "Very little important").
Will be completed once at the start of each shift.
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Difference between day 2, in simulated QR (evening- followed by day shift) and day 2 in the control condition (day- followed by day shift). Day 2 in QR- and control combination: 7AM-3PM.
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Change in Cognitive Throughput
Time Frame: Changes from first to last test session on day 2 in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2 in the control condition (day- followed by day shift). Day 2 in QR- and control combination: 7AM-3PM.
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Cognitive throughput will be measured using the 'digit symbol substitution task'.
Taken throughout the shifts every 1.5h - 2h in total 5 times during each day shift (07:30AM, 09:00AM,10:30AM, 12:30PM and 02:30PM) and five times during the evening shift (03:30PM, 05:00PM, 6:30PM, 8:30PM and 10:30PM).
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Changes from first to last test session on day 2 in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2 in the control condition (day- followed by day shift). Day 2 in QR- and control combination: 7AM-3PM.
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Selective Attention
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Selective attention will be measured using a 'visual search task'.
The test will be taken twice per simulated shift; once during first half and once during second half of the shift.
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Executive functioning
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Executive functioning will be measured using the 'attentional network task'.
The test will be taken twice per simulated shift; once during first half and once during second half of the shift.
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Dexterity
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Dexterity will be measured using the 'grooved pegboard test'.
The test will be taken twice per simulated shift; once during first half and once during second half of the shift.
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Verbal Memory
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Verbal memory will be measured using a 'word probe recall test'.
The test will be taken twice per simulated shift; once during first half and once during second half of the shift.
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Cognitive Inhibition
Time Frame: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Cognitive inhibition will be measured using the 'go/no-go' test.
The test will be taken twice per simulated shift; once during first half and once during second half of the shift.
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Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
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Individual Differences - Mini International Personality Item Pool (Mini-IPIP)
Time Frame: Pre-intervention
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To examine if individual differences can moderate a potential effect of short rest between two shifts, Mini IPIP will be used.
Mini-IPIP is a 20-item short form of the 50-item International Personality Item Pool-Five Factor Model.
Scores participant on five dimensions: neuroticism, extraversion, agreeableness, conscientiousness, and openness based on a set of likert-scale questions from 1 - 5 ('1' - "Very incorrect" to '5' - "Very correct").
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Pre-intervention
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Individual Differences - Dark Triad Personality Scale
Time Frame: Pre-intervention
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To examine if individual differences can moderate a potential effect of short rest between two shifts, the Dark Triad Personality scale will be used.
Dark Triad Personality Scale contains 12-items.
The test scores the participant based on a set of likert-scale questions from 1 - 9 ('1'- "Completely disagree" to '9' "Completely agree") on the dimensions; machiavellianism, narcissism and psychopathy.
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Pre-intervention
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Individual Differences - Revised Circadian Type Inventory (CTI-R)
Time Frame: Pre-intervention
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To examine if individual differences can moderate a potential effect of short rest between two shifts, the CTI-R will be used.
CTI-R contains 11-items indicating ability to change sleeping rhythm based on the dimensions; flexibility and languidity.
The test scores the participant on based on a set of likert-scale questions from 1 - 5 ('1' - "Almost never" to '5' - "Almost always").
High scores on flexibility reflect better ability to sleep and work at odd times, whereas high scores on languidity indicates difficulties overcoming drowsiness and feeling of lethargy following sleep loss.
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Pre-intervention
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Individual Differences - Horne-Östberg Morning-Eveningness Questionnaire (MEQ)
Time Frame: Pre-intervention
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To examine if individual differences can moderate a potential effect of short rest between two shifts, the MEQ will be used.
MEQ contains 19-items indicating circadian preference; morning-/evening type.
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Pre-intervention
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Individual Differences - Genotypes
Time Frame: Pre-intervention
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To examine if individual differences can moderate a potential effect of short rest between two shifts, saliva samples will be collected to analyze for genotypes related to shift work tolerance. Genotyping will be done with regard to: SLC6A4 tandem repeat length in the promoter (short; S versus long; L), rs25531 (A versus G), rs8192440, rs12506228 and rs4680. Analyses will be done using Custom TaqMan genotyping assays. |
Pre-intervention
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Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 303671
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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Clinical Trials on Sleep Deprivation
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Herlev HospitalTRYG Foundation; Danish Medical AssociationCompletedEffect of Sleep DeprivationDenmark
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Christian BaumannCompletedAcute and Partial Sleep DeprivationSwitzerland
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Dr. Osman HospitalCairo UniversityUnknownEffect of Insomnia and Sleep Deprivation in 3rdtrimesterEgypt
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Hallym University Medical CenterCompletedWe Investigated the Effect of Sleep Deprivation on the Tear Film and Ocular Surface.Korea, Republic of
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University of PittsburghNational Institute of Mental Health (NIMH)Not yet recruitingSleep | Sleep Disturbance | Insufficient SleepUnited States
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Children's Hospital of PhiladelphiaEunice Kennedy Shriver National Institute of Child Health and Human Development...CompletedSleep | Sleep Disturbance | Sleep DeprivationUnited States
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University of ChicagoCompleted
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Beth Israel Deaconess Medical CenterNational Institute of Mental Health (NIMH)Active, not recruiting