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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Date data sharing statement initially provided
Type of registration
Prospectively registered

Titles & IDs
Public title
Assessing oxidative stress caused by a meal in healthy males
Scientific title
Assessing a time course of plasma myeloperoxidase, a marker of oxidative stress, following a high fat high carbohydrate meal in healthy males
Secondary ID [1] 298536 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Oxidative stress 313351 0
Condition category
Condition code
Metabolic and Endocrine 311789 311789 0 0
Metabolic disorders
Diet and Nutrition 311894 311894 0 0
Other diet and nutrition disorders

Study type
Description of intervention(s) / exposure
This study is a single arm intervention study. The study requires healthy male participants to make two visits to the testing facility.

The first visit is a screening visit where eligible participants will also have their height, weight, waist circumference and body composition measured by a researcher trained in collecting anthropometric measures. At this visit participants will also provide the research team with basic demographic information (age, sex, ethnicity).

The second visit, designated as the testing visit, has participants attending the testing facility from 8:00 am to 5:00 pm. Participants will arrive to this visit following an overnight fast after consuming a standardised dinner meal the night before (participants are provided with a pre-prepared meal, which is to be re-heated in the microwave), between 7:00 and 9:00 pm. Participants will also be asked to avoid a list of foods high in antioxidants and avoid strenuous exercise for the 24 hours prior to the beginning of the testing session. Participants will receive reminders via text message prior to the testing session to remind them of these requirements.

During the testing visit, the participants will have a cannula inserted into a vein in their arm by a nurse, for multiple blood draws. Participants will also have capillary blood samples taken during the testing visit, via finger pricks. Following a two hour run-in period, including venous and capillary blood sampling, participants are given a high fat high carbohydrate challenge meal (48% carbohydrates, 39% fat; smoothie containing ~50% of daily estimated energy requirements based on participant weight) to consume within 10 minutes (time 0). Following this, venous blood samples will be collected every 15 minutes for the first hour, every 30 minutes for the following two hours, and then every 60 minutes up to 6 hours following the meal. Finger prick blood samples will be collected 30 and 60 minutes following the meal. All blood samples will be taken by a nurse or by researchers trained in phlebotomy.

During the testing visit participants will also be asked to complete a series of questionnaires about the food intake and physical activity. With the guidance of the researchers, participants will complete a food frequency questionnaire with a focus on high antioxidant foods, a 24-hour food recall to asses their usual intake and compliance with consuming the standardised dinner meal, and the International Physical Activity Questionnaire (IPAQ) to assess their participation in walking, moderate and vigorous physical activity.
Intervention code [1] 314868 0
Intervention code [2] 314869 0
Early detection / Screening
Comparator / control treatment
No control group
Control group

Primary outcome [1] 320467 0
Myeloperoxidase enzyme activity in serum as assessed by colorimetric assay
Timepoint [1] 320467 0
Postprandial time course study with measurements taken -2 hours, -1 hour, 0 min, 15 min, 30 min, 45 min, 60 min, 90 min, 120 min, 150 min, 180 min, 240 min, 300 min and 360 min before/after the meal. There is no one time point that is the primary time point.
Secondary outcome [1] 371715 0
Plasma glucose concentration as assessed by Thermo Fisher Indiko clinical chemistry analyser
Timepoint [1] 371715 0
Postprandial time course study with measurements taken -2 hours, -1 hour, 0 min, 15 min, 30 min, 45 min, 60 min, 90 min, 120 min, 150 min, 180 min, 240 min, 300 min and 360 min before/after the meal. There is no one time point that is the primary time point.
Secondary outcome [2] 371716 0
White blood cell count as assessed by HemoCue WBC DIFF analyser using finger prick capillary blood samples
Timepoint [2] 371716 0
-1 hour, 30 min and 60 min before/after the meal. There is no one time point that is the primary time point.
Secondary outcome [3] 372005 0
Usual dietary intake (energy intake and macronutrient composition) as assessed using a 24-hour food recall questionnaire
Timepoint [3] 372005 0
Recall completed on the testing day recalling all food consumed in the prior 24 hours.
Secondary outcome [4] 372006 0
Usual polyphenol intake as assessed using an updated version of a validated food frequency questionnaire designed for assessing intake of high polyphenol foods
Timepoint [4] 372006 0
Completed on testing day and assessing intake from the previous month.
Secondary outcome [5] 372007 0
Usual physical activity level (MET score) as assessed using the International Physical Activity Questionnaire (IAPQ) short version
Timepoint [5] 372007 0
Completed on the testing day and assessing physical activity from the previous week

Key inclusion criteria
• Body mass index between the range of 18.5 to 25.0 kg/m2
• Blood pressure between 90/60 and 140/90 mmHg
• Aged between 18 and 35 years
• Non-smoker
Minimum age
18 Years
Maximum age
35 Years
Can healthy volunteers participate?
Key exclusion criteria
• Body mass index outside the range of 18.5 to 25.0 kg/m2
• Blood pressure below 90/60 or above 140/90 mmHg
• Taking medications with antioxidant activity or that may affect absorption of phytochemicals
• Taking nutritional supplements with antioxidant activity
• Diagnosed with a medical condition
• Consume greater than 14 standard drinks of alcohol per week
• Has an implanted cardiac defibrillator
• Has any dietary allergies/intolerances that prevent consuming study meals

Study design
Purpose of the study
Allocation to intervention
Non-randomised trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Not applicable
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?

Intervention assignment
Single group
Other design features
Not Applicable
Type of endpoint(s)
Statistical methods / analysis
15 participants are required to show a 20% change in myeloperoxidase (MPO), a biomarker of oxidative stress. 20 participants will be recruited to allow for up to a 25% dropout rate.

Statistical analysis will be carried out using SPSS Statistics software package. Data will be assessed using descriptive statistics to identify the time points at which myeloperoxidase activity is first detected and at which it reaches peak activity. Similar analysis will be used for secondary outcomes of plasma glucose concentration and capillary white blood cell count.

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)
Recruitment postcode(s) [1] 26801 0
3168 - Notting Hill
Recruitment postcode(s) [2] 26802 0
3800 - Monash University

Funding & Sponsors
Funding source category [1] 303079 0
Name [1] 303079 0
Monash University
Address [1] 303079 0
Monash University Clayton Campus,
Wellington Road, Clayton 3800
Country [1] 303079 0
Primary sponsor type
Monash University
Monash University Clayton Campus,
Wellington Road, Clayton 3800
Secondary sponsor category [1] 303065 0
Name [1] 303065 0
Address [1] 303065 0
Country [1] 303065 0

Ethics approval
Ethics application status
Ethics committee name [1] 303627 0
Monash University Human Research Ethics Committee
Ethics committee address [1] 303627 0
Monash University, Clayton Campus
Wellington Road, Clayton 3800
Ethics committee country [1] 303627 0
Date submitted for ethics approval [1] 303627 0
Approval date [1] 303627 0
Ethics approval number [1] 303627 0

Brief summary
Consuming fruits and vegetables, which naturally contain antioxidants, reduces the risk of developing chronic diseases potentially through reducing oxidative stress and low-grade inflammation in the body. Oxidative stress and inflammation (OSI) are common and are associated with meal digestion, however this only lasts for a short period of time in healthy bodies. We hypothesise that by matching the time when antioxidants are taken and are present in the blood with the onset of post-meal OSI we can optimise the benefits of the antioxidants.

This study will provide data on the time course and appearance of markers of oxidative stress and inflammation following a meal.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 94314 0
Dr Aimee Dordevic
Address 94314 0
Monash University, Be Active Sleep Eat (BASE) Facility
Level 1, 264 Ferntree Gully Road
Notting Hill 3168 VIC
Country 94314 0
Phone 94314 0
+61 3 9905 2142
Fax 94314 0
Email 94314 0
Contact person for public queries
Name 94315 0
Dr Margaret Murray
Address 94315 0
Room 218, 13 Rainforest Walk
Monash University Clayton Campus,
Clayton 3800 VIC
Country 94315 0
Phone 94315 0
+61 3 9905 1415
Fax 94315 0
Email 94315 0
Contact person for scientific queries
Name 94316 0
Dr Margaret Murray
Address 94316 0
Room 218, 13 Rainforest Walk
Monash University Clayton Campus,
Clayton 3800 VIC
Country 94316 0
Phone 94316 0
+61 3 9905 1415
Fax 94316 0
Email 94316 0

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No/undecided IPD sharing reason/comment
This form of data sharing was not included in the ethics application.
What supporting documents are/will be available?
No other documents available
Summary results
No Results