Relationship Among Changes in Sedentary Time, Physical Activity, and Body Mass Index in Young Schoolchildren: A 3-Year Longitudinal Study

Amanda Santos, Sandra Silva-Santos, Michael Duncan, Maria João Lagoa, Susana Vale, Jorge Mota

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Purposes: To examine the association between sedentary time (ST) and light physical activity (LPA), moderate- to vigorous-intensity physical activity (MVPA), and body mass index (BMI), and to track these behaviors over a 3-year follow-up in young schoolchildren. Methods: The final sample was 64 children (female: n = 36 or 56.3%), enrolled in schools in Porto, Portugal. Height and mass of children were measured by standard methods, and BMI was then calculated. ST, LPA, and MVPA were measured by accelerometer. Changes (Δ) and relative changes (Δ%) between 2009/2010 and 2012/2013 of ST, LPA, MVPA, and BMI were computed. Multiple linear regression analyses were fit to predict Δ%ST (outcome variable), by Δ%LPA, Δ%MVPA, and Δ%BMI (exposure variables). Results: ST increased and LPA decreased significantly for whole sample (both Ps < .05). No statistically significant difference was found for MVPA over time. There were no differences for ΔST, ΔLPA, ΔMVPA, and ΔBMI between boys and girls. The Δ%LPA and Δ%MVPA were negatively associated with Δ%ST, whereas Δ%BMI was positively associated. Tracking coefficients varied from moderate to strong. Conclusions: Time spent in ST increases due to displacement of time in LPA. This reinforces public health measures and suggests the need for interventions focusing on offsetting the decline ST and increasing MVPA during childhood.
Original languageEnglish
Pages (from-to)426-432
Number of pages7
JournalPediatric Exercise Science
Volume30
Issue number3
DOIs
Publication statusPublished - 31 Aug 2018

Fingerprint

Longitudinal Studies
Body Mass Index
Exercise
Light
Portugal
Linear Models
Public Health
Regression Analysis

Keywords

  • sedentary lifestyle
  • exercise
  • accelerometer
  • obesity

Cite this

Relationship Among Changes in Sedentary Time, Physical Activity, and Body Mass Index in Young Schoolchildren: A 3-Year Longitudinal Study. / Santos, Amanda; Silva-Santos, Sandra; Duncan, Michael; Lagoa, Maria João ; Vale, Susana; Mota, Jorge.

In: Pediatric Exercise Science, Vol. 30, No. 3, 31.08.2018, p. 426-432.

Research output: Contribution to journalArticle

Santos, Amanda ; Silva-Santos, Sandra ; Duncan, Michael ; Lagoa, Maria João ; Vale, Susana ; Mota, Jorge. / Relationship Among Changes in Sedentary Time, Physical Activity, and Body Mass Index in Young Schoolchildren: A 3-Year Longitudinal Study. In: Pediatric Exercise Science. 2018 ; Vol. 30, No. 3. pp. 426-432.
@article{6a6aa942adab4ce69c6e613d4131eea8,
title = "Relationship Among Changes in Sedentary Time, Physical Activity, and Body Mass Index in Young Schoolchildren: A 3-Year Longitudinal Study",
abstract = "Purposes: To examine the association between sedentary time (ST) and light physical activity (LPA), moderate- to vigorous-intensity physical activity (MVPA), and body mass index (BMI), and to track these behaviors over a 3-year follow-up in young schoolchildren. Methods: The final sample was 64 children (female: n = 36 or 56.3{\%}), enrolled in schools in Porto, Portugal. Height and mass of children were measured by standard methods, and BMI was then calculated. ST, LPA, and MVPA were measured by accelerometer. Changes (Δ) and relative changes (Δ{\%}) between 2009/2010 and 2012/2013 of ST, LPA, MVPA, and BMI were computed. Multiple linear regression analyses were fit to predict Δ{\%}ST (outcome variable), by Δ{\%}LPA, Δ{\%}MVPA, and Δ{\%}BMI (exposure variables). Results: ST increased and LPA decreased significantly for whole sample (both Ps < .05). No statistically significant difference was found for MVPA over time. There were no differences for ΔST, ΔLPA, ΔMVPA, and ΔBMI between boys and girls. The Δ{\%}LPA and Δ{\%}MVPA were negatively associated with Δ{\%}ST, whereas Δ{\%}BMI was positively associated. Tracking coefficients varied from moderate to strong. Conclusions: Time spent in ST increases due to displacement of time in LPA. This reinforces public health measures and suggests the need for interventions focusing on offsetting the decline ST and increasing MVPA during childhood.",
keywords = "sedentary lifestyle, exercise, accelerometer, obesity",
author = "Amanda Santos and Sandra Silva-Santos and Michael Duncan and Lagoa, {Maria Jo{\~a}o} and Susana Vale and Jorge Mota",
year = "2018",
month = "8",
day = "31",
doi = "10.1123/pes.2017-0163",
language = "English",
volume = "30",
pages = "426--432",
journal = "Pediatric Exercise Science",
issn = "0899-8493",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Relationship Among Changes in Sedentary Time, Physical Activity, and Body Mass Index in Young Schoolchildren: A 3-Year Longitudinal Study

AU - Santos, Amanda

AU - Silva-Santos, Sandra

AU - Duncan, Michael

AU - Lagoa, Maria João

AU - Vale, Susana

AU - Mota, Jorge

PY - 2018/8/31

Y1 - 2018/8/31

N2 - Purposes: To examine the association between sedentary time (ST) and light physical activity (LPA), moderate- to vigorous-intensity physical activity (MVPA), and body mass index (BMI), and to track these behaviors over a 3-year follow-up in young schoolchildren. Methods: The final sample was 64 children (female: n = 36 or 56.3%), enrolled in schools in Porto, Portugal. Height and mass of children were measured by standard methods, and BMI was then calculated. ST, LPA, and MVPA were measured by accelerometer. Changes (Δ) and relative changes (Δ%) between 2009/2010 and 2012/2013 of ST, LPA, MVPA, and BMI were computed. Multiple linear regression analyses were fit to predict Δ%ST (outcome variable), by Δ%LPA, Δ%MVPA, and Δ%BMI (exposure variables). Results: ST increased and LPA decreased significantly for whole sample (both Ps < .05). No statistically significant difference was found for MVPA over time. There were no differences for ΔST, ΔLPA, ΔMVPA, and ΔBMI between boys and girls. The Δ%LPA and Δ%MVPA were negatively associated with Δ%ST, whereas Δ%BMI was positively associated. Tracking coefficients varied from moderate to strong. Conclusions: Time spent in ST increases due to displacement of time in LPA. This reinforces public health measures and suggests the need for interventions focusing on offsetting the decline ST and increasing MVPA during childhood.

AB - Purposes: To examine the association between sedentary time (ST) and light physical activity (LPA), moderate- to vigorous-intensity physical activity (MVPA), and body mass index (BMI), and to track these behaviors over a 3-year follow-up in young schoolchildren. Methods: The final sample was 64 children (female: n = 36 or 56.3%), enrolled in schools in Porto, Portugal. Height and mass of children were measured by standard methods, and BMI was then calculated. ST, LPA, and MVPA were measured by accelerometer. Changes (Δ) and relative changes (Δ%) between 2009/2010 and 2012/2013 of ST, LPA, MVPA, and BMI were computed. Multiple linear regression analyses were fit to predict Δ%ST (outcome variable), by Δ%LPA, Δ%MVPA, and Δ%BMI (exposure variables). Results: ST increased and LPA decreased significantly for whole sample (both Ps < .05). No statistically significant difference was found for MVPA over time. There were no differences for ΔST, ΔLPA, ΔMVPA, and ΔBMI between boys and girls. The Δ%LPA and Δ%MVPA were negatively associated with Δ%ST, whereas Δ%BMI was positively associated. Tracking coefficients varied from moderate to strong. Conclusions: Time spent in ST increases due to displacement of time in LPA. This reinforces public health measures and suggests the need for interventions focusing on offsetting the decline ST and increasing MVPA during childhood.

KW - sedentary lifestyle

KW - exercise

KW - accelerometer

KW - obesity

U2 - 10.1123/pes.2017-0163

DO - 10.1123/pes.2017-0163

M3 - Article

VL - 30

SP - 426

EP - 432

JO - Pediatric Exercise Science

JF - Pediatric Exercise Science

SN - 0899-8493

IS - 3

ER -