Grain Exercise Trial - Whole Grain Versus no Grain With or Without Physiotherapy-promoted Exercise for Waist Loss (GET)

Lund University

Status and phase: Completed; Phase 3; Phase 2

Conditions: Hypertension; Overweight; Abdominal Obesity; Cardiovascular Diseases; Diabetes Type 2

Treatments: Behavioral: Diet A; Behavioral: Diet B; Behavioral: Physiotherapy

Study type: Interventional

Funder types: Other

Identifiers

NCT01208558

LU2010/332

Details and patient eligibility

About

The main purpose of this 2-year lifestyle experiment for waist loss is twofold:

1. to compare whole grains and no grains as part of a healthy diet,
2. to determine if an 8-week exercise program, led by physiotherapists, is more efficient than brief counseling and follow-up.

People with abdominal overweight (≥84 cm in women and ≥98 cm in men) and at least one additional cardiovascular risk factor, (typically hypertension, diabetes type 2 or prior cardiovascular disease) are randomly assigned to receive Diet A or Diet B, with or without a structured exercise program at the department of physiotherapy, or to a control group receiving usual care. Diet A and B both include fruit, vegetables, fish, meat, and low-fat dairy products, and differ only in that Diet A recommends exchange of cereal grains for more potatoes, root vegetables, fruit and other carbohydrate-rich foods, while Diet B recommends exchange of regular cereal grains for whole grains. The primary outcome (most important follow-up variable) is change in waist circumference during 2 years. Secondary outcome measures include blood pressure, blood lipids, level of physical activity and, in subjects with diabetes, glycated hemoglobin and fasting blood sugar.

Full description

This is a randomized controlled trial with 5 parallel groups of approximately equal size. Two hundred subjects with increased waist circumference (≥84 cm in women and ≥98 cm in men) and at least one additional cardiovascular risk factor will be included.

Four of the 5 groups will receive dietary advice (A or B) and 2 of them will be allocated to physiotherapy. A fifth control group will only receive usual care in addition to follow-up. Randomization will be performed by use of an internet-based random number generator from the School of Computer Science and Statistics, Trinity College, Dublin (www.random.org). randomly assigned to receive Diet A or Diet B, with or without a structured exercise program at the department of physiotherapy, or to a control group receiving usual care.

In addition to primary (waist loss) and secondary outcome measures as given below, a health questionnaire will be performed at baseline and after 12 and 24 months with questions about general health, self-reported quality of life, medication use, living habits, physical activity, nutrition, tobacco, alcohol, personal motivation and perceived ability to change lifestyle. Furthermore, serum creatinine will be measured at baseline, and after 3, 6, 12 and 24 months.

There are few randomized controlled trials comparing the effect of different lifestyle interventions on physical activity level or weight loss in overweight people at high risk of cardiovascular disease. There is no such study of the possible effect of a structured exercise program with group training led by physiotherapists, with the exception of rehabilitation programs after myocardial infarction. In addition, the possible unique effect of cereal grains on satiety and energy intake has not been addressed in randomized controlled trials. In two earlier studies in glucose intolerance and diabetes type 2, we have applied a dietary model (Paleolithic diet) based on root vegetables, fruit, vegetables, meat and fish, partly at the expense of cereal grains (Lindeberg et al., 2007; Jönsson et al., 2009). The results showed a more beneficial effect on waist circumference than from traditional dietary advice. In one of the studies in 29 overweight men with coronary heart disease and impaired glucose tolerance, the decrease of waist circumference was 2.7 cm greater (p=0,03) in the intervention group (-5.6 cm; 95% confidence interval [CI] -7.2;-3.9) than in the control group (-2.9, CI -4.8;-1.1) during 3 months of follow-up (Lindeberg et al., 2007). In the second study, where the same dietary model was applied in cross-over design among 13 subjects with diabetes type 2, waist circumference decreased 4 cm more (p=0,02) during the intervention diet than during the control diet (Jönsson et al., 2009). There is some evidence to suggest that cereal grains may interfere with leptin receptor activity in a way that could hypothetically suppress satiety (Jönsson et al., 2005; Kamikubo et al., 2008).

Enrollment: 105 patients

Sex: All

Ages: 20 to 90 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• increased waist circumference (≥84 cm in women and ≥98 cm in men)
• AND at least one additional cardiovascular risk factor: hypertension, diabetes type 2, prior coronary heart disease, prior stroke/TIA, peripheral arterial disease, impaired glucose tolerance, prior gestational diabetes, heredity or smoking

Exclusion criteria

• dependence on walking aids
• difficulty to understand Swedish (written or spoken)
• BMI >40 kg/m2
• cognitive impairment
• pronounced hearing loss
• aphasia
• continuous treatment with warfarin or prednisolone

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Factorial Assignment

Masking: None (Open label)

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105 participants in 5 patient groups

Diet A and physiotherapy

Active Comparator group

Description:

Behavioral: Diet A Prudent diet without grains. Written advice and 17-20 group sessions. Subjects are advised to avoid cereal grains. Apart from that, the recommendation is to follow Nordic Nutrition Recommendations (NNR) for overweight people, i.e. to eat much fruit, vegetables, fish, and to choose low-fat meat, and low-fat dairy products, and to avoid junk food and juice. In order to match carbohydrate intake between the arms, a high intake of potatoes, root vegetables, fruit and other carbohydrate-rich foods is recommended. Behavioral: Physiotherapy Twelve physiotherapy-led, charged, 2-hour sessions of structured group training for increased cardiorespiratory fitness. A pedometer sold at the start. Physical activity on prescription (FaR) at the end.

Treatment:

Behavioral: Physiotherapy

Behavioral: Diet A

Diet B and physiotherapy

Active Comparator group

Description:

Behavioral: Diet B Prudent diet with whole grains. Written advice and 17-20 group sessions. An exchange of regular cereal grains for whole grains is recommended. A daily intake of 7-8 portions of whole grain products is recommended, and a list of recommended cereal products (brands, names) is provided. Apart from that, the recommendation is identical to Diet A. Other Name: Whole grains Behavioral: Physiotherapy Twelve physiotherapy-led, charged, 2-hour sessions of structured group training for increased cardiorespiratory fitness. A pedometer sold at the start. Physical activity on prescription (FaR) at the end. Other Name: Exercise

Treatment:

Behavioral: Physiotherapy

Behavioral: Diet B

Diet A only

Active Comparator group

Description:

Behavioral: Diet A Prudent diet without grains. Written advice and 17-20 group sessions. Subjects are advised to avoid cereal grains as much as possible. Apart from that, the recommendation is to follow Nordic Nutrition Recommendations (NNR) for overweight people (www.slv.se; in Swedish), i.e. to eat much fruit, vegetables, fish, and to choose low-fat meat, and low-fat dairy products, and to avoid candy, ice cream, snacks, cakes, pastries, chocolate, potato chips, beer, soft drinks and juice. In order to match carbohydrate intake between the intervention arms, a high intake of potatoes, root vegetables, fruit and other carbohydrate-rich foods is recommended. Other Name: No grains

Treatment:

Behavioral: Diet A

Diet B only

Active Comparator group

Description:

Behavioral: Diet B Prudent diet with whole grains. Written advice and 17-20 group sessions. An exchange of regular cereal grains for whole grains is recommended. A daily intake of 7-8 portions of whole grain products is recommended, and a list of recommended cereal products (brands, names) is provided. Apart from that, the recommendation is identical to Diet A. The goal is that carbohydrate intake, as a proportion of total energy intake, should not differ between the groups. Other Name: Whole grains

Treatment:

Behavioral: Diet B

Control

No Intervention group

Description:

Only follow-up. No intervention.