Trial Review

Registering a new trial?

To achieve prospective registration, we recommend submitting your trial for registration at the same time as ethics submission.

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been endorsed by the ANZCTR. Before participating in a study, talk to your health care provider and refer to this information for consumers
Trial details imported from ClinicalTrials.gov

For full trial details, please see the original record at https://clinicaltrials.gov/study/NCT01771042




Registration number
NCT01771042
Ethics application status
Date submitted
15/01/2013
Date registered
18/01/2013
Date last updated
18/01/2013

Titles & IDs
Public title
The Effects of Weight Loss on Neuroadrenergic Function
Scientific title
Neuroadrenergic Dysfunction Along the Diabetes Continuum: Benefits of Weight Loss Within Different Strata of Metabolic Risk
Secondary ID [1] 0 0
1/13
Secondary ID [2] 0 0
1/13
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Obesity 0 0
Type 2 Diabetes 0 0
Metabolic Syndrome 0 0
Condition category
Condition code
Metabolic and Endocrine 0 0 0 0
Metabolic disorders

Intervention/exposure
Study type
Interventional
Description of intervention(s) / exposure
Other interventions - Dietary weight loss at 25% energy deficit

Experimental: Normal glucose tolerant - Weight loss attained by 25% caloric restriction.

This arm will be both a glycemic and time control. Initially they will undergo a 4-month weight maintenance phase (acting as time control), followed by 4 month weight loss.

Experimental: Impaired glucose tolerant - Weight loss using 25% caloric restriction.

Impaired glucose tolerant subjects will undergo 4 months weight loss (25% caloric deficit) followed by 3 months weight loss maintenance

Experimental: Type 2 diabetic hyperinsulinemic - Weight loss using 25% caloric restriction.

This group will undergo 4 months weight loss (25% caloric deficit) followed by 3 months weight loss maintenance

Experimental: Type 2 diabetic hypoinsulinemic - Weight loss via 25% caloric restriction.

This group will undergo 4 months weight loss (25% caloric deficit) followed by 3 months weight loss maintenance


Other interventions: Dietary weight loss at 25% energy deficit
Dietary weight loss at 25% energy deficit. Dietary macronutrient content will comprise 25% protein, 30% fat and 45% carbohydrate.
Intervention code [1] 0 0
Other interventions
Comparator / control treatment
Control group

Outcomes
Primary outcome [1] 0 0
Change in whole-body norepinephrine kinetics
Timepoint [1] 0 0
4 months and 7 months
Secondary outcome [1] 0 0
Change in muscle sympathetic nerve activity
Timepoint [1] 0 0
4 months and 7 months

Eligibility
Key inclusion criteria
Men and postmenopausal women (n=120), untreated, weight-stable, non-smoking, aged 45-65 years, BMI 27-45 kg/m2, will be recruited. Glucose tolerance status will be determined by a 75-g oral glucose tolerance test (OGTT), using WHO criteria (53): normal glucose tolerance, fasting plasma glucose < 7.0 mmol/L and 2-h plasma glucose < 7.8 mmol/L; IGT, fasting plasma glucose < 7.0 mmol/L and 2-h plasma glucose > 7.8 and < 11.1 mmol/L; T2D, fasting plasma glucose > 7.0 mmol/L or 2-h plasma glucose > 11.1 mmol/L. Hyper-insulinemia will be defined as an insulin area under the curve during OGTT > 8000 mU/L · min-1 and hypo-insulinemia as < 8000 mU/L · min-1.
Minimum age
45 Years
Maximum age
65 Years
Sex
Both males and females
Can healthy volunteers participate?
No
Key exclusion criteria
Prior history of cardiovascular disease (previous myocardial infarction, angina, stroke, heart failure, secondary hypertension), renal (serum creatinine >0.12 mmol/L or estimated GFR <60 ml/min/1.73 m2) or hepatic disease or diseases which may affect measured parameters (e.g. thyroid disease); severe hypertension; a history of surgical weight loss; CPAP therapy; and >4 alcoholic drinks/day. T2D individuals with moderate hyperglycemia (HbA1c >9%) will be excluded so that hypoglycaemic pharmacotherapy may be instituted (54). Participants will be sought through newspaper advertising and poster displays in primary health care centres (General Practices). Newly diagnosed T2D subjects

Study design
Purpose of the study
Treatment
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)
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?



Intervention assignment
Parallel
Other design features
Phase
Not applicable
Type of endpoint/s
Statistical methods / analysis

Recruitment
Recruitment status
UNKNOWN
Data analysis
Reason for early stopping/withdrawal
Other reasons
Date of first participant enrolment
Anticipated
Actual
1/04/2013
Date of last participant enrolment
Anticipated
Actual
Date of last data collection
Anticipated
1/04/2017
Actual
Sample size
Target
120
Accrual to date
Final
Recruitment in Australia
Recruitment state(s)
VIC
Recruitment hospital [1] 0 0
Baker IDI Heart & Diabetes Institute - Melbourne
Recruitment postcode(s) [1] 0 0
8008 - Melbourne

Funding & Sponsors
Primary sponsor type
Other
Name
Baker Heart Research Institute
Address
Country

Ethics approval
Ethics application status

Summary
Brief summary
Elevated subconscious nervous system activity is a characteristic of the obese state and contributes importantly to the risk of heart disease and diabetes. This project will compare sympathetic nervous system activity and function in a group of obese persons with differing levels of sugar tolerance (normal, impaired and type 2 diabetic). Inter-relationships with insulin action, blood pressure, heart and kidney function will be determined before and after a 4-month weight loss and 3-month weight loss maintenance program.

It is hypothesized that the transition from normal sugar tolerance to impaired sugar tolerance to type 2 diabetes will be accompanied by escalating sympathetic nervous system dysfunction. Furthermore, that weight loss will favorably improve sympathetic function, with greatest benefits occurring in those subjects who are insulin resistant with high blood insulin concentration.
Trial website
https://clinicaltrials.gov/study/NCT01771042
Trial related presentations / publications
Straznicky NE, Grima MT, Sari CI, Lambert EA, Phillips SE, Eikelis N, Kobayashi D, Hering D, Mariani JA, Dixon JB, Nestel PJ, Karapanagiotidis S, Schlaich MP, Lambert GW. Reduction in peripheral vascular resistance predicts improvement in insulin clearance following weight loss. Cardiovasc Diabetol. 2015 Aug 22;14:113. doi: 10.1186/s12933-015-0276-2.
Straznicky NE, Grima MT, Lambert EA, Sari CI, Eikelis N, Nestel PJ, Phillips SE, Hering D, Karapanagiotidis S, Dixon JB, Schlaich MP, Lambert GW. Arterial norepinephrine concentration is inversely and independently associated with insulin clearance in obese individuals with metabolic syndrome. J Clin Endocrinol Metab. 2015 Apr;100(4):1544-50. doi: 10.1210/jc.2014-3796. Epub 2015 Jan 15.
Public notes

Contacts
Principal investigator
Name 0 0
Dr Nora E Straznicky, PhD MPH
Address 0 0
Baker IDI Heart & Diabetes Institute
Country 0 0
Phone 0 0
Fax 0 0
Email 0 0
Contact person for public queries
Name 0 0
Dr Nora E Straznicky, PhD MPH
Address 0 0
Country 0 0
Phone 0 0
61 3 8532 1371
Fax 0 0
Email 0 0
[email protected]
Contact person for scientific queries



Summary Results

For IPD and results data, please see https://clinicaltrials.gov/study/NCT01771042