Background Efforts to recruit and retain participants in clinical trials are challenging,
especially in studies that include minority or low-income children. To date, no studies have …

Abstract Background Randomised controlled trials (RCTs) are recommended as the 'gold
standard'in evaluating health care interventions. The conduct of RCTs is often impacted by …

This study's aim was to examine selected objectively-measured and child specific built
environment attributes in relation to proportion of out-of-school time spent in moderate-to …

Background There is accumulating evidence supporting the association between
neighborhood built environments and adults' physical activity (PA) and sedentary time (ST); …

Background Independent mobility describes the freedom of children to travel and play in
public spaces without adult supervision. The potential benefits for children are significant …

Background Physical activity has been associated with many benefits throughout the life
course. As levels of physical activity appear to be insufficient in large populations, the …

We identify five challenges notoriously faced by researchers conducting youth intervention
studies: access to the target population, successful recruitment, ensuring continued …

The family setting can be an opportunistic environment for parents and children to engage in
physical activity (PA) together; however, there is still much to learn from families about their …

Background Family-based interventions present a much-needed opportunity to increase
children's physical activity levels. However, little is known about how best to engage parents …

Longitudinal cohort studies present unique methodological challenges, especially when
they focus on vulnerable populations, such as pregnant women. The purpose of this review …