Classes of Physical Activity and Sedentary Behavior in 5th Grade Children.
OBJECTIVE
We identified classes of physical activity (PA) and sedentary behaviors (SB) in 5th grade children, associated factors, and trajectories of change into 7th grade.


METHODS
This study included N = 495 children (221 boys, 274 girls) who participated in the Transitions and Activity Changes in Kids (TRACK) Study. PA was assessed objectively as well as by self-report. Children, parents, and school administrators completed surveys to assess related factors. Latent class analysis, growth modeling, and adjusted multinomial logistic regression procedures were used to classify children based on self-reported PA and SB and examine associated factors.


RESULTS
Three classes of behavior were identified: Class 1: Low PA/Low SB; Class 2: Moderate PA/ High SB; and Class 3: High PA/High SB (boys) or Class 3: High PA (girls). Class 3 children had higher levels of self-efficacy (boys), and enjoyment, parental support, and physical activity equipment at home (girls). Class 2 boys and Class 3 girls did not experience decline in PA (accelerometer) over time.


CONCLUSIONS
Self-efficacy (boys) and home environment (girls) may play a role in shaping patterns of PA in children. Findings may help to inform future interventions to encourage children to meet national PA guidelines.
University of Pittsburgh, Pittsburgh, PA, USA. seross@pitt.edu.
Sharon E
SE
Taverno Ross
Biostatistician, University of South Carolina, Columbia, SC, USA.
Marsha
M
Dowda
University of Georgia, Athens, GA, USA.
Rodney K
RK
Dishman
University of South Carolina, Columbia, SC, USA.
Russell R
RR
Pate
D002648:Child; D002652:Child Behavior / Q000145:classification* / Q000523:psychology*; D015444:Exercise; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D057185:Sedentary Behavior; D020377:Self Efficacy