Accelerometry of Self-Paced Children's Games During Guided Active Play
Accelerometry (ACC) estimates of oxygen cost from linear regression equations (treadmill calibrated) are limited when assessing children’s self-paced active play. The purpose of this study was to determine if the magnitude and direction of ACC estimates were implicated in the poor predictions of children’s self-paced active play. Children’s (n=15, 9.3±1.2 yrs; BMI 20.5±4.0) cardiorespiratory and metabolic responses to treadmill activity (4, 6 and 8 km/h [0% grade]) and active playing of 6 games were determined using FITMATE. Accelerometers (ActiGraph GT3X) collected PA counts (10sec epochs) for all activities. The linear regression equations (VM for time, VO2) generated for each activity, and relative contribution of each axes, were compared (ANOVA) and assessed at p=0.05. During treadmill activity the linear relationships for VM with speed (at 4, 6, and 8kmh) and oxygen consumption (VO2) were 0.90±0.03 and 0.82±0.05, respectively (p>0.05). The linear relationships (VM with time and measured VO2) averaged over 6 self-paced games were 0.061±0.035 and 0.006±0.002 (p<0.05). Linear regressions for each game resulted in a range of intercepts, for VM and time, from 520±198 cnts/10sec to 1189±196 cnts/10sec (p<0.05) compared to treadmill values of 193±95 cnts/10sec (p<0.05). The measured VO2 values for self-paced games were higher at lower counts (VM) for all games. The percent difference in axis contribution to VM between the dominant and lowest axis was 41±14% and 7±5% for treadmill activity and self-paced games, respectively (p<0.05). This study reveals that characteristics of children’s self-paced PA impacts the linear relationship identified by ACC for locomotion activities.
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