Infant Leg Activity Intensity Before and After Naps

in Journal for the Measurement of Physical Behaviour
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  • 1 University of Southern California
  • 2 University of Innsbruck
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Wearable sensors are being used to measure intensity of infant physical activity across full days. The variability of infant activity intensity within and across days is important to study given the potential impact of physical activity on developmental trajectories. Using retrospective data, we analyzed the intensity of leg movements in 10 typically developing infants pre- and post-naptimes. Leg movement data were captured from 20 minutes before and after multiple events of naps across seven days for each infant. We hypothesized that leg movement intensity would be lower before a nap than after a nap potentially due to lower arousal and increased fatigue prior to attaining sleep. However, our results showed that leg movement intensity was not significantly different when comparing the 20-minute period pre- and post-naps (F(1,7) = 3.91, p = .089, ηp2=0.358). Our results are a first step in describing patterns of infant activity across days and highlights the need for further research regarding infant energy expenditure and physical activity.

Trujillo-Priego, Zhou, Deng, and Smith are with the Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, USA. Werner is with the Department of Sports Sciences, University of Innsbruck, Innsbruck, Austria.

Trujillo-Priego (ivantrujillopriego@gmail.com) is corresponding author.
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