TY  - JOUR
PY  - 2012//
TI  - A cluster analysis of physical activity and sedentary behavior patterns in middle school girls
JO  - Journal of Adolescent Health
A1  - Trilk, Jennifer L.
A1  - Pate, Russell R.
A1  - Pfeiffer, Karin A.
A1  - Dowda, Marsha
A1  - Addy, Cheryl L.
A1  - Ribisl, Kurt M.
A1  - Neumark-Sztainer, Dianne
A1  - Lytle, Leslie A.
SP  - 292
EP  - 298
VL  - 51
IS  - 3
N2  - PURPOSE: To identify similar patterns of physical activity (PA) and sedentary behavior in sixth-grade girls using cluster analysis; to determine which clusters of girls were associated with greater daily minutes of objectively measured PA; and to examine whether girls in these clusters experienced change in PA from sixth to eighth grade. METHODS: An adventitious cohort of girls (n = 957) from the Trial of Activity for Adolescent Girls were measured at sixth and eighth grade. Activities were identified using the 3-day physical activity recall and a self-report survey and used to create clusters of sixth-grade girls who had similar PA/sedentary behaviors. Accelerometry was used to assess PA in sixth and eighth grade. Data analysis consisted of FASTCLUS procedure and mixed model repeated measures analyses in SAS statistical software. RESULTS: Cluster analysis yielded six clusters (C1: educational sedentary; C2: sports and play; C3: organized sports teams/classes/lessons in past year; C4: active transport and chores; C5: electronic media; C6: sleep). Sixth-grade girls in C2 and C3 had greater average daily minutes of moderate-to-vigorous physical activity (MVPA), metabolic equivalent of a physical activity-weighted MVPA, and vigorous physical activity compared with other clusters (p < .05). In eighth grade, sedentary time increased and PA declined among girls in all clusters (p < .05). Girls in C2 had the greatest decline in PA, whereas girls' PA in C3 declined less. CONCLUSIONS: Encouraging participation in organized sports teams/class/lessons in middle school girls may promote greater MVPA and vigorous physical activity than other activities and may help to better sustain PA levels over time.<p />  <p>Language: en</p>
LA  - en
SN  - 1054-139X
UR  - http://dx.doi.org/10.1016/j.jadohealth.2011.12.021
ID  - ref1
ER  -