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Trial registered on ANZCTR
Registration number
ACTRN12619000713190
Ethics application status
Approved
Date submitted
8/05/2019
Date registered
13/05/2019
Date last updated
22/04/2020
Date data sharing statement initially provided
13/05/2019
Date results information initially provided
22/04/2020
Type of registration
Prospectively registered
Titles & IDs
Public title
Investigating the influence of an oral rinse intervention, containing a taste stimuli, on participants taste perception/sensitivity.
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Scientific title
Oral Rinse Intervention Study, investigating changes in detection and recognition threshold and suprathreshold intensity perception following an oral rinse containing specific tastants in generally healthy participants.
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Secondary ID [1]
298186
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Nil known
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Universal Trial Number (UTN)
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Trial acronym
ORIS
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
Taste sensitivity
312772
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Condition category
Condition code
Oral and Gastrointestinal
311270
311270
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0
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Normal oral and gastrointestinal development and function
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Participants will be completing four, 2-week oral rinse interventions, where they are required to rinse their mouth out with 30ml of a food grade solution, 3 times a day (directly after breakfast, lunch and dinner), for 30 seconds, participants will be instructed not to swallow the solution.
In a randomised, cross-over intervention design participants will be exposed to all four interventions in a uniquely randomised order, with a 3-week washout between each oral rinse intervention. Participants will be sent via text or email a link to a compliance survey where they will be required to record all rinses completed on that day, or any rinses missed on that day, this will be sent out between 7-8.30pm daily.
The rinses include:
- 400 mM Monopotassium Glutamate
- 400 mM Monosodium Glutamate
- 400 mM sucrose
- 400 mM sodium chloride
Participants will be provided with the solutions for the two weeks and will be instructed to keep the solutions in the fridge for the duration of the intervention, once the intervention has been completed participants can dispose of the bottles as required. Participants will complete the oral rinse intervention at home/away from the research facility.
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Intervention code [1]
314421
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Other interventions
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Comparator / control treatment
There is no control intervention, due to the nature of the balanced, randomised, cross-over intervention design, participants will be their own control, and thus no control intervention rinse will be applied.
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Control group
Uncontrolled
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Outcomes
Primary outcome [1]
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Change in taste sensitivity (mM) for detection threshold (DT) and recognition threshold (RT), this is measured following ISO - Method of Investigating sensitivity of taste (ISO 3972:1991).
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Assessment method [1]
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Timepoint [1]
320012
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After two weeks of the intervention
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Primary outcome [2]
320013
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Change in taste intensity perception, on 100 point vertical line scale (Labelled Magnitude Scale).
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Assessment method [2]
320013
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Timepoint [2]
320013
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After two weeks of the intervention
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Secondary outcome [1]
370235
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Change in umami discrimination status, based on number of correct answers in a discrimination task, this discrimination task requires participants to taste three samples containing 29mM MSG or 29mM NaCl and choose the sample that is different, this is repeated 24 times as per previously published methodology (Lugaz O1, Pillias AM, Faurion A. Chem Senses. A new specific ageusia: some humans cannot taste L-glutamate. 2002 Feb;27(2):105-15).
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Assessment method [1]
370235
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Timepoint [1]
370235
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After two weeks of the intervention
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Eligibility
Key inclusion criteria
Any participant, provided they do not meet any of the exclusion criteria.
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Minimum age
18
Years
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Maximum age
50
Years
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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
- non smoker
- not currently pregnant
- no allergies to the food grade chemicals in the rinse
- no known taste impairments
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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 not concealed, participants allocate to the next available intervention order.
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Randomisation generated in consultation with a statistician using simple randomisation for example from a statistics book to ensure all possible orders obtained, due to four interventions, there are 24 possible orders for a balanced design.
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Masking / blinding
Open (masking not used)
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Who is / are masked / blinded?
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Intervention assignment
Crossover
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Other design features
A balanced, cross-over intervention design will be followed.
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Phase
Not Applicable
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Type of endpoint/s
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Statistical methods / analysis
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Recruitment
Recruitment status
Active, not recruiting
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Date of first participant enrolment
Anticipated
15/05/2019
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Actual
20/05/2019
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Date of last participant enrolment
Anticipated
10/07/2019
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Actual
15/11/2019
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Date of last data collection
Anticipated
15/12/2020
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Actual
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Sample size
Target
48
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Accrual to date
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Final
44
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Recruitment in Australia
Recruitment state(s)
VIC
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Recruitment postcode(s) [1]
26444
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3125 - Burwood
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Funding & Sponsors
Funding source category [1]
302725
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University
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Name [1]
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Deakin University, Centre for Advanced Sensory Science
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Address [1]
302725
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221 Burwood highway, Burwood, VIC, 3125
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Country [1]
302725
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Australia
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Primary sponsor type
University
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Name
Deakin University, School of Exercise and Nutrition Sciences, Centre for Advanced Sensory Science.
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Address
221 Burwood highway, Burwood, VIC, 3125
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Country
Australia
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Secondary sponsor category [1]
302657
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None
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Name [1]
302657
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Address [1]
302657
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Country [1]
302657
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
303332
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Deakin University Human Research Ethics Committee
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Ethics committee address [1]
303332
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Locked Bag 20000, Geelong, VIC 3220
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Ethics committee country [1]
303332
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Australia
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Date submitted for ethics approval [1]
303332
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18/03/2019
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Approval date [1]
303332
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02/05/2019
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Ethics approval number [1]
303332
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2019-094
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Summary
Brief summary
Investigating factors that influence taste perception provides an insight why individuals may over consume certain foods. There are a number of factors which influence taste perception, including environmental (dietary) and genetic factors. In this study we will be investigating the influence of frequent oral (mouth) exposure to certain taste stimuli on taste perception. As certain genes have been found to be associated with individual differences in taste perception, it is also of interest to investigate the role genetics has in taste perception particularly following oral exposure to certain taste stimuli. It is hypothesised that oral exposure to certain tastants will reduce participants taste sensitivity, that is make them less sensitive, to that specific tastant.
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Trial website
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
Name
93302
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Prof Russell Keast
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Address
93302
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Deakin University, 221 Burwood Highway, Burwood, VIC, 3125
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Country
93302
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Australia
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Phone
93302
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+61 3 924 46944
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Fax
93302
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Email
93302
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[email protected]
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Contact person for public queries
Name
93303
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Miss Isabella Hartley
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Address
93303
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Deakin University, 221 Burwood Highway, Burwood, VIC, 3125
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Country
93303
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Australia
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Phone
93303
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+61409891681
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Fax
93303
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Email
93303
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[email protected]
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Contact person for scientific queries
Name
93304
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Prof Russell Keast
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Address
93304
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Deakin University, 221 Burwood Highway, Burwood, VIC, 3125
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Country
93304
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Australia
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Phone
93304
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+61 3 924 46944
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Fax
93304
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Email
93304
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[email protected]
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Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No
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No/undecided IPD sharing reason/comment
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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
Source
Title
Year of Publication
DOI
Embase
Oral Exposure to Sodium Chloride without Subsequent Consumption Does Not Alter Salt Taste Function in Adults: A Cross-Over Intervention Study.
2023
https://dx.doi.org/10.1016/j.tjnut.2022.12.010
N.B. These documents automatically identified may not have been verified by the study sponsor.
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