Gaming Technology to Encourage Healthy Weight and Activity in Youth

Height and weight will be collected at Screening, Week 0, and Week 24. Standing height will be measured in cm with a Harpenden stadiometer (Holtain Limited, Crymych, UK) with shoes removed while the participant holds breath and an assessor applies light traction to align the participant's head along the Frankfort Horizontal Plane. Weight will be measured in kg with a Michelli GSE 460 scale (G.T. Michelli Co., Baton Rouge, LA) while wearing a hospital gown and undergarments. Measures will be taken twice and recorded to the nearest 0.1 units, with a third if the initial 2 measures are greater than 0.5 units apart. BMIz will be calculated based on the child's age, sex, height, and weight using the 2000 Centers for Disease Control and Prevention (CDC) Growth Charts. The Z-score indicates the number of standard deviations away from the mean. A Z-score of 0 is equal to the mean. Negative numbers indicate values lower than the mean and positive numbers indicate values higher than the mean

A dual energy x-ray absorptiometry (DXA) scan will be completed at Week 0 and Week 24 with a GE iDXA whole-body scanner (GE Medical Systems, Milwaukee, WI) to measure adiposity, including total body fat mass and regional fat mass in the extremities and trunk.

Resting blood pressure will be assessed at Screening, Week 0, and Week 24 using standard clinical procedures on a standard mercury manometer. The participant's age-, sex-, and height-specific percentile will be calculated.

Resting blood pressure will be assessed at Screening, Week 0, and Week 24 using standard clinical procedures on a standard mercury manometer. The participant's age-, sex-, and height-specific percentile will be calculated.

A blood sample will be taken at Week 0 and Week 24 by a trained phlebotomist following standard clinic procedures after an 8-hour fast. Serum concentrations of total cholesterol will be assayed on a DXC600 from Trinity.

A blood sample will be taken at Week 0 and Week 24 by a trained phlebotomist following standard clinic procedures after an 8-hour fast. Serum concentrations of glucose will be obtained from a DXC600 by Beckman Coulter.

Physical activity will be assessed with an Actigraph GT3X+ accelerometer (ActiGraph, of Ft. Walton Beach, FL) to determine changes in habitual physical activity outside of the gaming intervention. Participants will wear the accelerometer for two bouts of 7-days following Week 0 baseline clinic visit and Week 24 clinic visit, but not during the gaming intervention.

Dietary information will be collected from the participant at Week 0 and Week 24. Healthy diet score will be determined by the NCI Self-administered 24-hour Dietary Recall (ASA24-Kids). This survey is administered on a computer through a web-based program.