Effects of exercise training and diet restriction on cardiovascular function in obese population

ISRCTN ISRCTN83594346
DOI https://doi.org/10.1186/ISRCTN83594346
Secondary identifying numbers SAHPL02
Submission date
27/04/2017
Registration date
28/04/2017
Last edited
08/06/2023
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Nutritional, Metabolic, Endocrine
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English summary of protocol

Background and study aims
Obesity causes atherosclerosis, where the blood vessels (arteries) become clogged, harden and narrow, which can lead to heart disease. Obesity is also linked to endothelial dysfunction, arterial stiffness and autonomic dysfunction. Endothelial dysfunction, where the endothelium (inner lining) of blood vessels fails to function normally, can be measured using a method called brachial artery flow-mediated dilation (FMD). Pulse wave velocity (PWV), the rate at which the arterial pulse moves down the vessel, is a way to measure arterial stiffness. Autonomic dysfunction is assessed by measuring heart rate variability (HRV), the variation in the time interval between heartbeats. The aim of this study is to investigate the effects of an 8-week combined exercise and diet intervention on endothelial function, autonomic nervous system and arterial stiffness in obese adults.

Who can participate?
Obese adults, aged 18 and over

What does the study involve?
Participants complete an eight-week exercise training and diet intervention. Body measurements and blood samples are taken, and FMD, PWV and HRV are measured before and after the 8-week combined exercise and diet intervention, to find out whether the exercise and diet intervention improves endothelial function, autonomic function and arterial stiffness.

What are the possible benefits and risks of participating?
Exercise training and diet may improve the participants’ health and heart function. The risks of the study are minor, as the physical examinations and procedures are performed by experienced doctors in the appropriate clinical setting and exercise training is individually tailored and supervised by professional trainers. The blood sampling is associated with a small risk of bruise and inflammation of the veins. Vigorous exercise can result in injuries. This risk is minimized by tailoring exercise to the participant’s individual needs, based on the assessment of his or her physical fitness.

Where is the study run from?
Sunstarasia Weight Loss Camp (China)

When is the study starting and how long is it expected to run for?
March 2016 to September 2016

Who is funding the study?
1. National Natural Science Foundation of China
2. Natural Science Foundation of Guangdong Province
3. Foundation of Youth Talents in Higher Education of Guangdong Province of China
4. Pearl River Scholar Program in Guangdong Province of China

Who is the main contact?
1. Miss Dan Wang (public)
17880383@qq.com
2. Prof. Junhao Huang (scientific)
junhaohuang2006@hotmail.com

Contact information

Miss Dan Wang
Public

1268 Middle Guangzhou Avenue
Scientific Research Building Floor 1
Guangzhou Sport University
Guangzhou
510500
China

Phone +86 (0)20 3802 5087
Email 17880383@qq.com
Prof Junhao Huang
Scientific

1268 Middle Guangzhou Avenue
Scientific Research Building Floor 1
Guangzhou Sport University
Guangzhou
510500
China

ORCiD logoORCID ID 0000-0001-9981-9558
Phone +86 (0)20 3802 5087
Email junhaohuang2006@hotmail.com

Study information

Study designObese subjects (BMI ≥ 30 kg/m2) were recruited from the weight loss camp (single-centre) and various parameters were measured before and after 8-week combined exercise and diet intervention.
Primary study designInterventional
Secondary study designNon randomised study
Study setting(s)Other
Study typePrevention
Participant information sheet Not available in web format, please use the contact details to request a patient information sheet
Scientific titleEffects of an 8-week combined exercise and diet intervention on endothelial function, autonomic function and arterial stiffness in obese adults
Study objectivesExercise and diet intervention improves endothelial function arterial stiffness and autonomic function in obese adults.
Ethics approval(s)Ethics Committee of Guangzhou Sport University, 17/03/2016, ref: GSU20160012
Health condition(s) or problem(s) studiedObesity
InterventionObese subjects (BMI ≥ 30 kg/m2) were recruited from the weight loss camp after physical examination. The weight loss camp was totally closed with uniformly managed accommodation, diet and training during the 8-week intervention period. The campers lived in the same building, where they could not move in and out freely. Subjects were provided with energy-restricted diets of 1300-2200 kcal/day based on weight. The energy percentages provided by protein, fat and carbohydrate were 20%, 20% and 60%, respectively, while energy distributions at breakfast, lunch and dinner were 30%, 40% and 30%, respectively. All meals were prepared and supervised by registered professional dietitians during the diet intervention. Subjects performed a series of endurance exercise such as bicycling, walking, running, dancing and ball games for 5 hour/day, supplemented with resistance exercise. Training interventions were performed 6 day/week for 8 weeks. The exercise program was designed to result in an energy expenditure of 1500-2500 kcal/day. Qualified trainers supervised the subjects during the training program. Measurements were performed before and after the 8-week combined exercise training and diet intervention.
Intervention typeOther
Primary outcome measure1. Endothelial function, assessed by flow-mediated dilation (FMD)
2. Circulating endothelial progenitor cells levels, evaluated by flow cytometry
3. Heart rate variability (HRV), aortic pressure, augmentation pressure, augmentation index, measured using the SphygmoCor device (AtCor Medical, Sydney, Australia)
4. Pulse wave velocity (PWV), measured using both the SphygmoCor device and an oscillometric device (boso ABI-system 100; BOSCH & SOHN, Germany)

Measurements performed before and after the 8-week combined exercise training and diet intervention.
Secondary outcome measures1. Body composition determined using a body composition analyzer (Inbody 370, Biospace, Seoul, Korea)
2. Resting heart rate (HR) and brachial systolic/diastolic blood pressure (bSBP/bDBP), measured using a sphygmomanometer
3. Aerobic fitness, assessed using the Physical Working Capacity at a heart rate of 150 beats per minute (PWC150) or a heart rate of 170 beats per minute (PWC170) cycle ergometer test (Ergoselect 100, Ergoline, Bitz, Germany)
4. Circulating irisin levels, measured using irisin ELISA kit (Phoenix Pharmaceuticals, CA, USA) following the manufacturer’s instructions
5. Concentrations of vascular endothelial growth factor (VEGF), endothelial nitric oxide synthase (eNOS), adiponectin, tumor necrosis factor-alpha (TNF-α), high-sensitivity C-reactive protein (hsCRP) and superoxide dismutase (SOD) in serum, analyzed using ELISA Kits respectively (Cusabio, Biotech. Co., LTD, Wuhan, China) according to the manufacturer’s instructions

Measurements performed before and after the 8-week combined exercise training and diet intervention.
Overall study start date18/03/2016
Completion date02/09/2016

Eligibility

Participant type(s)Patient
Age groupAdult
Lower age limit18 Years
SexBoth
Target number of participants22
Key inclusion criteria1. Obese adults who had a body mass index (BMI) ≥ 30 kg/m2)
2. Aged 18 and over
Key exclusion criteria1. Unstable angina pectoris
2. Myocardial infarction within the last 12 months
3. Decompensated heart failure
4. Cardiomyopathy
5. Severe valvular heart disease
6. Considerable pulmonary disease
7. Uncontrolled hypertension
8. Kidney failure
9. Orthopaedic and/or neurological limitations to exercise
10. Surgery during the intervention period
11. Drug or alcohol abuse
Date of first enrolment01/04/2016
Date of final enrolment31/07/2016

Locations

Countries of recruitment

  • China

Study participating centre

Sunstarasia Weight Loss Camp
Huizhou
516000
China

Sponsor information

Guangzhou Sport University
University/education

1268 Middle Guangzhou Avenue
Guangzhou
510500
China

Phone +86 (0)20 3802 4222
Email whoomin@hotmail.com
ROR logo "ROR" https://ror.org/046r6pk12

Funders

Funder type

Government

National Natural Science Foundation of China
Government organisation / National government
Alternative name(s)
Chinese National Science Foundation, Natural Science Foundation of China, National Science Foundation of China, NNSF of China, NSF of China, 国家自然科学基金委员会, National Nature Science Foundation of China, Guójiā Zìrán Kēxué Jījīn Wěiyuánhuì, NSFC, NNSF, NNSFC
Location
China
Natural Science Foundation of Guangdong Province
Government organisation / Local government
Alternative name(s)
Guangdong Provincial Natural Science Foundation, Natural Science Foundation of Guangdong, Guangdong Natural Science Foundation, Natural Science Fund of Guangdong Province, 廣東省自然科學基金
Location
China
Foundation of Youth Talents in Higher Education of Guangdong Province of China

No information available

Pearl River Scholar Program in Guangdong Province of China

No information available

Results and Publications

Intention to publish date15/07/2017
Individual participant data (IPD) Intention to shareYes
IPD sharing plan summaryAvailable on request
Publication and dissemination planThe trialists plan to publish the results of this study to academic journals this year.
IPD sharing planThe datasets generated during and/or analysed during the current study are/will be available upon request from Prof. Min Hu (whoomin@hotmail.com).

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Dataset 14/08/2017 08/06/2023 No No
Other publications sub study 05/10/2017 08/06/2023 Yes No
Results article 14/08/2017 08/06/2023 Yes No

Editorial Notes

08/06/2023: Publication references and dataset added.