Factors Associated With Physical Inactivity Among Adolescents

Study Overview
=================
Brief Summary
-----------------
Despite the acknowledgment that physical activity is important for health, there are still few population-based or school-based studies that uses the current physical activity guidelines for adolescents. Physical inactivity was defined a less than 300 min/w of moderate to vigorous-intensity physical activity practice. Previous research has shown very high prevalence rates of physically inactive adolescents and a strong association with demographic, socioeconomic and biological factors. Based on this information, the investigators are elaborating a systematic review of literature to obtain and provide more accurate information in this context.

Detailed Description
-----------------
The objectives of this study were to (i) review extant literature on the prevalence of physical inactivity (PI) in adolescents of both sex (10-18 years old); (ii) compare its prevalence between developed and developing countries. The search was carried out using online databases (Biomed Central, CINAHL, EMBASE, ERIC, MEDLINE, PsycInfo, Scopus, SPORTDiscus), references cited by retrieved articles and by contact with the authors, considering articles published from the establishment of the databanks until April 29th, 2010.

Official Title
-----------------
Factors Associated With Physical Inactivity Among Adolescents: a Systematic Review and Meta-analysis

Conditions
-----------------
Physical Inactivity, Obesity, Overweight

Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Cross-sectional studies. Original studies showed that physical inactivity is evaluated through a questionnaire. Studies which ranked 300> inactivity min/wk. Exclusion Criteria: Studies did not assess physical inactivity through a questionnaire. Studies in which the participants were only overweight/obese, diabetics or suffering from another disease.

Ages Eligible for Study
-----------------
Minimum Age: 10 Years
Maximum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Description<br>2137 studies retrieved in 8 databases (Biomed Central, CINAHL, EMBASE, ERIC, PsycInfo, PUBMED, SCOPUS, SPORTDiscus and uploaded in EndNote Web®. 332 studies were excluded as duplicates by EndNote Web®. 1805 titles and abstracts were assessed independently by two researchers (PG/AM): 1541 studies excluded. 264 studies referred for full-text assessment by two independent investigators (PG/AM) 225 studies were excluded according to the eligibility criteria (in case of discrepancies in the assessment of the researchers, studies were reviewed in duplicate) 39 Studies assessed for quality using STROBE 13 Studies were included in the descriptive synthesis | |

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Obtain the prevalence of physical inactivity in adolescents (age 10-18 y) using a questionnaire. | For the purpose of our systematic review, physical inactivity was defined as less than 300 minutes per week of moderate to vigorous physical activity. | up than 1 week | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Physical activity, Epidemiology, Questionnaire, Cross-sectional study