Internet-based Physical Activity Intervention

Study Overview
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Brief Summary
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The purpose of this study is to determine whether access to a website with personalized feedback on physical activity level and suggestions to increase physical activity results in improvements in self-reported physical activity, anthropometrics and physiological measurements

Detailed Description
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In a website-based intervention study, the investigators wish to examine if it is possible to increase physical activity among inactive persons. Main objective is to determine if access to a website with personalized feedback on PA level and suggestions to increase PA results in improvements in self reported PA, anthropometrics and applied physiological measurements. Physical inactive adults (n=12,287) participating in a nationwide health survey and examination (DANHES) were asked to randomly assigned to either intervention (n=6,055) or control group (n=6,232). The intervention group had access to a PA website with personalized advice and suggestions to increase PA. After 3 and 6 months, a follow-up questionnaire was administered by e-mail. The 7-day International Physical Activity Questionnaire was included in the questionnaires to assess four domains of PA in daily-life (work, transportation, domestic, and leisure-time) and sedentary time. Furthermore, at the 3 month follow-up a subgroup of participants (n=1,190) were invited complete anthropometrics and physiological measurements.

Official Title
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Internet-based Physical Activity Intervention

Conditions
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Physical Activity

Intervention / Treatment
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* Behavioral: website assess


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy adults Physically inactive in leisure time (assessed by self reported questionnaire) Exclusion Criteria: Presence of serious heart problems or not being able to perform everyday activities Highly physically active in leisure time (assessed by self reported questionnaire)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: Control group<br>The control group were not given access to the intervention website and received no additional information. | Behavioral: website assess<br>* The internet intervention group were given assess to the intervention website which included a personal page with tailored physical activity advice and a personal profile together with Recommendations and general training programs.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Self reported physical activity | Physical activity was assessed self reported with the International Physical Activity Questionnaire (IPAQ) | after 3 month | 
| Self reported physical activity | Physical activity was assessed self reported with the International Physical Activity Questionnaire (IPAQ) | After 6 month | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Body weight | Body weight was measured to the nearest 0.1 kg and percent point with a Segmeantal Body Composition Analyser (type BC-418 MA, Tanita Corp., Tokyo, Japan). | after 3 month | 
| Fat percentage | Fat percentage was measured to the nearest 0.1 kg and percent point with a Segmeantal Body Composition Analyser (type BC-418 MA, Tanita Corp., Tokyo, Japan). | after 3 month | 
| Hip and Waist circumference | Hip and waist circumference was measured with a body tape (Chasmors WM02 Body Tape, Chasmors Ltd.,London, United Kingdom) to the nearest 1.0 cm. Waist circumference was measured midway between the iliac crest and the costal margin following a quiet expiration, and lastly hip circumference was measured at the maximal circumference over the buttocks and below the iliac crest. | after 3 month | 
| blood pressure | Systolic and diastolic blood pressure were measured by fully automatic clinically validated blood pressure monitors (UA 779, UA-767 Plus 30 or UA 767 PC, A&D Company Ltd, Tokyo, Japan) | 3 month | 
| Aerobic fitness | Estimated during a max (watt-max) or a sub-maximal test on a ergometer bike depending on the physical condition of the participant (Ergomedic 828E, Monark Exercise AB, Vansbro, Sweden). One of the following conditions contraindicated participation in the watt-max test: Any heart-related disease, chest pain, hypertension (>160/100 mmHg), heart or lung (pulmonary) medication, pregnancy and muscle, joint or skeletal problems. The sub-max test was contradicted by hypertension (>180/110 mmHg), severe heart-related disease, certain types of heart medication, muscle, joint or skeletal problems. | after 3 month | 
| Arm muscle strength | Arm mucle strength was measured by bending of the arms with a Takei TKK 5402 digital back strength dynamometer (Takei Scientific Instruments Co. Ltd., Tokyo, Japan). The test was performed with maximal exertion. | after 3 month | 
| blood samples | Non-fasting venous blood samples were collected for future analyses of P-cholesterol, P-triglyceride, and haemoglobin A1c and for biobank storage. | After 3 months |