Intensity of physical activity, cardiorespiratory fitness, and body mass index in youth

The purpose of this study was to analyze the relation between body mass index (BMI), Cardiorespiratory Fitness (CRF), and levels of physical activity (PA) from sedentary to very vigorous intensities, measured by accelerometry, in students from a middle and high school. This cross-sectional study inc...

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Bibliographic Details
Published in:Journal of physical activity & health 2010-01, Vol.7 (1), p.54-59
Main Authors: Aires, Luisa, Silva, Pedro, Silva, Gustavo, Santos, Maria Paula, Ribeiro, José Carlos, Mota, Jorge
Format: Article
Language:English
Subjects:
Acceleration
Adolescent
Body Composition
Body Mass Index
Cardiovascular Physiological Phenomena
Child
Confidence Intervals
Cross-Sectional Studies
Exercise
Female
Health Status
Health Status Indicators
Humans
Logistic Models
Male
Motor Activity
Multivariate Analysis
Obesity - epidemiology
Odds Ratio
Overweight - epidemiology
Physical Fitness
Portugal - epidemiology
Respiratory Physiological Phenomena
Risk Factors
Sedentary Lifestyle
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Summary:The purpose of this study was to analyze the relation between body mass index (BMI), Cardiorespiratory Fitness (CRF), and levels of physical activity (PA) from sedentary to very vigorous intensities, measured by accelerometry, in students from a middle and high school. This cross-sectional study included 111 children and adolescents, age 11 to 18 years. PA was assessed with an accelerometer for 7 consecutive days (1 minute epoch) using specific cut-points. PA components were derived using special written software (MAHUffe). CRF was assessed by maximal multistage 20m shuttle run. T-test was used to test differences between BMI groups, Pearson's correlation, to analyze correlations between all variables and multinomial logistic regression, and to predict the value of BMI categories. This paper provides evidence that BMI was inversely and significantly correlated with CRF. Only CRF was correlated with Vigorous and Very Vigorous PA levels and total amount of PA. Children with Overweight/Obesity were less likely to perform more laps than normal weight counterparts. The total amount or intensity level of PA did not show any influence on BMI level. Low CRF is strongly associated with obesity, which highlights the importance of increasing CRF for a protective effect even in youth. No associations were found for PA and BMI.
ISSN:1543-3080
1543-5474
DOI:10.1123/jpah.7.1.54