Medicine and Health Sciences Commons^™

The Development And Testing Of A Direct Observation Protocol As A Criterion Measure For Children’S Simulated Free-Play Activity, Melanna Cox

Masters Theses

INTRODUCTION: Direct observation (DO) systems have been used for decades to assess free-living PA in children. These traditional DO systems identify the highest intensity observed during alternating observe-and-record periods. Using video-taped DO would allow researchers to code activities and contextual information each time the participant changes their behavior. PURPOSE: To develop and test a novel video-based DO system for children’s free-play activity. METHODS: Following iterative DO system development (The Observer XT, Noldus), 28 children (age=8.4 ± 1.5 years) participated in a 30-minute simulated free-play session that was recorded with a GoPro camera. Participants wore a portable indirect calorimetry (IC) device …

A Prospective Study Of Physical Activity And Fecundability, Lindsey M. Russo

Masters Theses

Background:

Physical activity (PA) may influence fecundability through alterations in endocrine function. The limited studies that have evaluated PA and fecundability in non-clinical populations have utilized internet-based recruitment, contain potential issues in measurement, and have yielded inconclusive results.

Methods:

We evaluated the association between PA and time-to-pregnancy in the Effects of Aspirin in Gestation and Reproduction trial, which included 1228 women attempting pregnancy ages 18–40 with prior pregnancy loss. PA was measured at baseline using the short form of the International Physical Activity Questionnaire to determine hours/week of activity (vigorous, moderate, and walking) and hours/day of sedentary (sitting) behavior. Pregnancy …