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Trial registered on ANZCTR
Registration number
ACTRN12621000350820
Ethics application status
Approved
Date submitted
27/01/2021
Date registered
26/03/2021
Date last updated
11/10/2023
Date data sharing statement initially provided
26/03/2021
Date results provided
11/10/2023
Type of registration
Prospectively registered
Titles & IDs
Public title
Do different ways of applying limb pressure alter blood flow in older adults using blood flow restricted exercise training?
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Scientific title
Blood flow restricted exercise: Effect of restriction pressure prescription on peripheral blood flow and tolerability in older adults
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Secondary ID [1]
303147
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None
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Universal Trial Number (UTN)
U1111-1263-7114
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Trial acronym
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
Cardiorespiratory function
320261
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Vascular function
321315
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Condition category
Condition code
Physical Medicine / Rehabilitation
318192
318192
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0
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Physiotherapy
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Cardiovascular
319101
319101
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0
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Normal development and function of the cardiovascular system
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Respiratory
319102
319102
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0
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Normal development and function of the respiratory system
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
In this experimental study, each participant will experience four experimental conditions, randomised over two days (two conditions each day; two 90-minute sessions separated by 48 hours each). In each experimental condition, participants will perform five minutes of low intensity cycling (9-11 on the Borg Rating of Perceived Exertion Scale), using a portable cycling pedal (Dual Exercise Bike, Bodyworx, Australia) while seated in an upright chair. Prior to and during cycling, participants will have an inflatable cuff (Achedway, Australia) placed on the proximal portion of both thighs, which will be inflated to a pre-specified pressure dependant on the experimental protocol. There will be a 10-minute rest interval between each experimental condition conducted on the same day.
Experimental conditions: Four different approaches to lower limb blood flow restriction will be used. For each of the four conditions, prescription of pressure in the inflatable cuffs (Achedway, Australia) placed on the proximal portion of both thighs will differ depending upon the experimental condition where: Approach 1 (Control) = 50% of limb occlusion pressure; Approach 2 = perception of cuff tightness (rating of 7 on a 0-10 scale where 0 means ‘Not tight at all’ and 10 means ‘Unbearable tightness’); Approach 3 = pressure calculated as 1.3 x systolic blood pressure measured at rest on day one; and Approach 4 = standardised pressure of 160 mmHg.
The intervention will be delivered face-to-face in a laboratory at the City East Campus of University of South Australia by a physiotherapist with four years of clinical experience with older individuals, and more than five years of experience with blood flow restricted exercise (BFRE) in the research setting. We will record adherence to intervention using a session attendance checklist.
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Intervention code [1]
319455
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Treatment: Other
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Comparator / control treatment
The aim of this study is to evaluate different methodological approaches commonly used in the prescription of restriction pressure for use in the application of BFR during exercise training interventions. Experimental Approach 1 (percentage of limb occlusion pressure) is the currently recommended approach for prescribing BFRE cuff pressure and will be considered the ‘control’ approach. In our statistical analysis, the three other approaches will be compared to Approach 1.
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Control group
Active
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Outcomes
Primary outcome [1]
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Change scores in peripheral blood flow (%). To assess this outcome, peripheral blood flow as assessed via sonography of the anterior and posterior tibial arteries (IU22 ultrasound machine, linear array 12-9 MHz transducer, Phillips Healthcare, Bothell, WA, USA).
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Assessment method [1]
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Timepoint [1]
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The endpoints are peripheral blood flow change scores from baseline to immediately following exercise with inflated cuff (primary endpoint) and from baseline to immediately following cuff release.
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Primary outcome [2]
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Absolute values of peripheral blood flow (ml/min). To assess this outcome, peripheral blood flow as assessed via sonography of the anterior and posterior tibial arteries (IU22 ultrasound machine, linear array 12-9 MHz transducer, Phillips Healthcare, Bothell, WA, USA).
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Assessment method [2]
326679
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Timepoint [2]
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The endpoints are peripheral blood flow absolute values Immediately before exercise (baseline), immediately following exercise with the cuffs inflated (primary endpoint) and immediately after cuff release.
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Secondary outcome [1]
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Breathing discomfort. To assess this outcome the A1 item of the Multidimensional Dyspnea Profile will be used.
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Assessment method [1]
390400
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Timepoint [1]
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Immediately before exercise, at the final minute of exercise (fourth minute), immediately following exercise with inflated cuff and immediately after cuff release.
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Secondary outcome [2]
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Peripheral muscle discomfort that will be assessed using a 0-10 numeric scale (0 – ‘No discomfort at all’ and 10 – ‘Unbearable discomfort’).
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Assessment method [2]
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Timepoint [2]
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Immediately before exercise, at the final minute of exercise (fourth minute), immediately following exercise with inflated cuff and immediately after cuff release.
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Secondary outcome [3]
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Perceived tightness that will be assessed using a 0-10 numeric scale (0 – ‘No tightness at all’ and 10 – ‘Unbearable tightness’).
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Assessment method [3]
390402
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Timepoint [3]
390402
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Immediately before exercise, at the final minute of exercise (fourth minute), immediately following exercise with inflated cuff and immediately after cuff release.
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Eligibility
Key inclusion criteria
Participants will be eligible for inclusion in this study if they are 50 years of age or greater.
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Minimum age
50
Years
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Maximum age
No limit
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Sex
Both males and females
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Can healthy volunteers participate?
Yes
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Key exclusion criteria
Participants will be excluded from the sample if have an ankle-brachial index (ABI) <0.9 or >1.4 or body-mass index (BMI) >30 Kg/m (assessed at the first visit) or self-report mobility issues limiting exercise performance or known contraindications or precautions to BFRE including major surgery within six months, use of oral contraception, family history of coagulation disorders, pulmonary embolism or deep vein thrombosis, a prior diagnosis of peripheral vascular disease, uncontrolled hypertension, Crohn’s disease, past fracture of the hip, pelvis, or femur.
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Study design
Purpose of the study
Treatment
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Allocation to intervention
Randomised controlled trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Allocation will be performed by contacting the holder of the allocation schedule who will br "off-site" or at central administration site.
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
A computerised sequence generation will be performed to define the randomisation schedule of order of approaches.
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Masking / blinding
Blinded (masking used)
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Who is / are masked / blinded?
The people receiving the treatment/s
The people assessing the outcomes
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Intervention assignment
Crossover
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Other design features
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Phase
Not Applicable
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Type of endpoint/s
Safety
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Statistical methods / analysis
Using a moderate effect size of 0.5, based on previous similar study (Mouser et al., 2017), and level of significance of p equal to or smaller than 0.05, a sample of 34 participants is estimated to provide 80% power. Anticipating up to 20% of participants may not complete the protocol (dropout) we aim to recruit at least 41 participants.
Data will be analysed using SPSS 23.0 software (SPSS, INC., Chicago, IL, USA) using both intention-to-treat (ITT) and per protocol (PP) approaches. All participants consenting to participate will be included in ITT analysis, irrespective of whether they complete all testing/assessment sessions. Per protocol analysis will be conducted where participants have completed the session for Approach 1 and at least one other approach. Descriptive statistics including mean, standard deviation, median and range to characterise the demographic, anthropometric (age, sex, BMI, ABI) and outcome data from each of the four methods. Shapiro-wilk test will be conducted to verify normality of data. For the primary outcome (peripheral blood flow), if data is considered normal, dependent t test will be performed to assess whether peripheral blood flow differs significantly between Approaches 2, 3 and 4 compared to Approach 1 (Wilcoxon test, if data not normally distributed). For the secondary outcomes (tolerability measures), linear regression models for each tolerability measure are planned to investigate associations between cuff pressure and tolerability measures. Level of significance will be set as p equal to or smaller than 0.05 for all analysis.
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Recruitment
Recruitment status
Stopped early
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Data analysis
Data analysis is complete
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Reason for early stopping/withdrawal
Other reasons/comments
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Other reasons
Lockdowns and restrictions due to the Coronavirus Disease 2019 (COVID-19) in South Australia disrupted the data collection.
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Date of first participant enrolment
Anticipated
6/04/2021
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Actual
6/04/2021
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Date of last participant enrolment
Anticipated
30/07/2021
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Actual
24/08/2021
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Date of last data collection
Anticipated
6/08/2021
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Actual
8/09/2021
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Sample size
Target
41
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Accrual to date
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Final
25
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Recruitment in Australia
Recruitment state(s)
SA
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Recruitment postcode(s) [1]
32491
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5000 - Adelaide
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Funding & Sponsors
Funding source category [1]
307550
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University
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Name [1]
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University of South Australia
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Address [1]
307550
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Corner of North Terrace and, Frome Rd, Adelaide SA 5001
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Country [1]
307550
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Australia
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Primary sponsor type
University
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Name
University of South Australia
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Address
Corner of North Terrace and, Frome Rd, Adelaide SA 5001
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Country
Australia
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Secondary sponsor category [1]
308705
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None
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Name [1]
308705
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Address [1]
308705
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Country [1]
308705
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
307616
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Human Research Ethics Committee - University of South Australia
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Ethics committee address [1]
307616
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Corner of North Terrace and, Frome Rd, Adelaide SA 5001
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Ethics committee country [1]
307616
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Australia
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Date submitted for ethics approval [1]
307616
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05/11/2019
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Approval date [1]
307616
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06/02/2020
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Ethics approval number [1]
307616
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202735
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Summary
Brief summary
The primary aim of this study is to determine whether peripheral blood flow differs according to the approach used to prescribe training pressures for blood flow restricted exercise (BFRE). A secondary aim is to explore associations between self-reported tolerability and cuff pressures. The specific research questions posed for this study of older adults are: 1) Does peripheral blood flow rate after cycling differ between cuff pressure prescription approaches? 2) Are sensations of discomfort, breathlessness and tightness intensity related to cuff pressure? We hypothesise that in older adults: 1) Peripheral blood flow rate will be significantly lower when the cuff is inflated and higher following cuff release when percent of systolic blood pressure, perceived cuff tightness or an arbitrary pressure are compared to the recommended percent of limb occlusion pressure (LOP) approach for prescribing blood flow restricted training pressure. 2) Significant positive associations will exist between cuff pressures and a) sensations of peripheral muscle discomfort and tightness under the cuff during cuff occlusion and b) intensity of breathing discomfort upon cuff release.
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Trial website
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Trial related presentations / publications
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Public notes
This trial was approved by the UniSA's Ethics Committee on 6/2/2020 and was planned to start in May 2020. However, due to COVID19 restrictions this study was delayed and is planned to start on February 2021.
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Contacts
Principal investigator
Name
107874
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Dr Elisio Pereira-Neto
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Address
107874
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University of South Australia, City East Campus, Corner of North Terrace and, Frome Rd, Adelaide SA 5001
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Country
107874
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Australia
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Phone
107874
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+61 8301 22868
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Fax
107874
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Email
107874
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elisio.pereira_neto@mymail.unisa.edu.au
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Contact person for public queries
Name
107875
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Elisio Pereira-Neto
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Address
107875
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University of South Australia, City East Campus, Corner of North Terrace and, Frome Rd, Adelaide SA 5001
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Country
107875
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Australia
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Phone
107875
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+61 8301 22868
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Fax
107875
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Email
107875
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elisio.pereira_neto@mymail.unisa.edu.au
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Contact person for scientific queries
Name
107876
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Elisio Pereira-Neto
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Address
107876
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University of South Australia, City East Campus, Corner of North Terrace and, Frome Rd, Adelaide SA 5001
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Country
107876
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Australia
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Phone
107876
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+61 8301 22868
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Fax
107876
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Email
107876
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elisio.pereira_neto@mymail.unisa.edu.au
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Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
Yes
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What data in particular will be shared?
De-identified data-set including age, gender, primary and secondary outcomes for each intervention protocol.
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When will data be available (start and end dates)?
Data will be available from the last day of data collection (6th August 2021) and since this is a research for a PhD program and does not involve SA government department, the information will be stored and available for 5 years (6th August 2026).
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Available to whom?
Available upon request to researchers who provide a methodologically sound proposal.
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Available for what types of analyses?
For IPD meta-analysis .
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How or where can data be obtained?
Data can be obtained by contacting the principal investigator and dataset will be provided by email.
Investigator: Elisio Pereira-Neto
Email: elisio.pereira_neto@mymail.unisa.edu.au
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What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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