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Trial registered on ANZCTR

Registration number
Ethics application status
Submitted, not yet approved
Date submitted
Date registered
Date last updated
Date data sharing statement initially provided
Type of registration
Prospectively registered

Titles & IDs
Public title
Sleepwear fibre and sleep quality in menopausal women
Scientific title
An Investigation of the Impact of Sleepwear Fibre Type on Menopausal Sleep Quality
Secondary ID [1] 296576 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Sleep 310371 0
Menopausal symptoms 310372 0
Condition category
Condition code
Reproductive Health and Childbirth 309096 309096 0 0
Menstruation and menopause

Study type
Description of intervention(s) / exposure
The study employs a within-subject, randomised, repeated-measures design with natural fibre for sleepwear types, 100% cotton and 100% Merino wool, with close matching of fabric thickness and mass per unit area. Following baseline assessments and a familiarisation night, each participant will be randomised to four polysomnography test nights (2 nights in cotton sleepwear and 2 in wool sleepwear) with at least 24 hours separating each study trial.
Both cotton and wool sleepwear are set in long sleeves and legs. The sleep laboratory will be maintained at 28C, 50% relative humidity.
Intervention code [1] 312886 0
Intervention code [2] 313199 0
Comparator / control treatment
Participants serve as their own control in a repeated-measures design.
Control group

Primary outcome [1] 308065 0
A primary outcome is sleep quality (with composite variables of sleep onset latency, total sleep time, wake after sleep onset, sleep efficiency, sleep fragmentation index, percentage of sleep stages and EEG power density).
Timepoint [1] 308065 0
Each participant attends the Sleep laboratory on five occasions (over a 3-4 week period), four of which are overnight sleep studies. The sleep studies are separated by at least 24 hours.
Secondary outcome [1] 353855 0
Menopausal symptoms - the number of objective hot flashes recorded using the Bahr
Timepoint [1] 353855 0
The menopausal symptoms will be monitored on each night of the four overnight sleep studies.
Secondary outcome [2] 365180 0
Clothing comfort
Applying a composite scale of a) texture sensation; b) wetness perception; c) stickiness sensation; and d) pleasantness sensation (Raccuglia, M., Pistak, K., Heyde, C., Qu, J., Mao, N., Hodder, S., & Havenith, G. (2017). Human wetness perception of fabrics under dynamic skin contact. Textile Research Journal, 0040517517716905.)
Timepoint [2] 365180 0
The Clothing comfort scale will be administered at bedtime and on waking - on each of the four overnight sleep studies.
Secondary outcome [3] 365181 0
Mood using a visual analogue scale.
Timepoint [3] 365181 0
At bedtime - on each of the four overnight sleep studies.

Key inclusion criteria
The target participants (N=35, aged 45-65 years, BMI =<30 kg.m-2) are a group of peri- and post-menopausal women.
•peri-menopausal (experience cyclic irregularity over the preceding 12 months and up
to 11 months of amenorrhea), or post-menopausal (have ceased menses for at least 1 year and not more than 3 years, or had bilateral oophorectomy at least six weeks before screening, and with Vasomotor scale of 2 or greater (Greene Climateric Scale) (Travers et al., 2005)
•willing to undergo four nights of sleep studies
Minimum age
45 Years
Maximum age
65 Years
Can healthy volunteers participate?
Key exclusion criteria
•Currently use medication containing estrogen, progestins, or androgens within 8 weeks from the start of the study.
•Have (or a history of) disorders that might affect sleep and/or thermoregulation (e.g., diabetes, cancer, heart disease, Raynaud's syndrome).
•Have (or a history of) moderate to severe sleep breathing disorders, sleep disorders and psychiatric conditions (e.g., insomnia, restless leg syndrome, depression, schizophrenia).
•Are on shift work or have crossed several time zones in the past fortnight.
•Are unwilling to refrain from moderate-intense exercise of greater than 30 minutes or mild exercise of greater than 1h on each sleep study night.

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Sealed opaque envelopes
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Simple randomisation using a randomisation table created by computer software (i.e. computerised sequence generation)
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?
The people receiving the treatment/s

The people assessing the outcomes
The people analysing the results/data
Intervention assignment
Other design features
Not Applicable
Type of endpoint(s)
Statistical methods / analysis
For the trial the sample size was calculated using the G Power sample size calculator software and to analyse the findings the Analysis of variance (ANOVA).

Recruitment status
Not yet recruiting
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)

Funding & Sponsors
Funding source category [1] 301154 0
Commercial sector/Industry
Name [1] 301154 0
Australian Wool Innovation Ltd
Address [1] 301154 0
Level 6, 68 Harrington Street, The Rocks, Sydney NSW 2000.
Country [1] 301154 0
Primary sponsor type
The University of Sydney
The University of Sydney
NSW 2006
Secondary sponsor category [1] 301743 0
Name [1] 301743 0
Address [1] 301743 0
Country [1] 301743 0

Ethics approval
Ethics application status
Submitted, not yet approved
Ethics committee name [1] 301902 0
Sydney university Human Research Ethics Committee
Ethics committee address [1] 301902 0
The Manager, Ethics Administration, University of Sydney: NSW 2006, Australia
Ethics committee country [1] 301902 0
Date submitted for ethics approval [1] 301902 0
Approval date [1] 301902 0
Ethics approval number [1] 301902 0

Brief summary
This study compares the sleep outcomes (sleep quality) between wool and cotton sleepwear (closely matched for fabric thickness and weight) in peri- and post-menopausal women.
It is hypothesised that wool sleepwear provides beneficial measured sleep outcomes (sleep quality and quantity, and sleep encephalograph power density) over cotton sleepwear.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 88494 0
A/Prof Chin Moi Chow
Address 88494 0
Discipline of Exercise and Sport Science
The University of Sydney
75 East Street, Lidcombe, NSW 2141
Country 88494 0
Phone 88494 0
+61 2 9351 9332
Fax 88494 0
Email 88494 0
Contact person for public queries
Name 88495 0
A/Prof Chin Moi Chow
Address 88495 0
Discipline of Exercise and Sport Science
The University of Sydney
75 East Street, Lidcombe, NSW 2141
Country 88495 0
Phone 88495 0
+61 2 9351 9332
Fax 88495 0
Email 88495 0
Contact person for scientific queries
Name 88496 0
A/Prof Chin-Moi Chow
Address 88496 0
Discipline of Exercise and Sport Science
The University of Sydney
75 East Street, Lidcombe, NSW 2141
Country 88496 0
Phone 88496 0
+61 2 9351 9332
Fax 88496 0
Email 88496 0

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No/undecided IPD sharing reason/comment
What supporting documents are/will be available?
No other documents available
Summary results
No Results