Examining the impact of a summer learning program on children's weight status and cardiorespiratory fitness: A natural experiment.

Unlabelled: This study examined the impact of an existing 7-week summer learning program on children's weight status and cardiorespiratory fitness (CRF).

Methods: Using an observational repeated measures within-subjects design, children's (N = 20 mean age = 6.35; 45% female; 80% African American) height, weight, and CRF (i.

Identifying and Quantifying the Unintended Variability in Common Systematic Observation Instruments to Measure Youth Physical Activity.

Background: Direct observation protocols may introduce variability in physical activity estimates.

Methods: Thirty-five physical education lessons were video recorded and coded using the System for Observing Fitness Instruction Time (SOFIT). A multistep process examined variability in moderate to vigorous physical activity (MVPA%; walking + vigorous/total scans).