Robust evaluation of time since awakening using force platform posturography
INTRODUCTION: Sleepiness is responsible for a considerable proportion of traffic accidents. It is thus an important traffic safety issue to find a robust, objective and practical way to estimate the amount of time a person has been awake. To attempt to meet this goal, we investigated the relationship between sleepiness and posture control. METHODS: Subjects were kept awake for 36 hours and posturographic data during quiet standing were collected every two hours by means of a force platform. The standing surface (rigid surface or foam surface) and visual (eyes open or eyes closed) conditions were manipulated. RESULTS: In the more challenging conditions (with foam surface and/or eyes closed), the body sway variables derived from the center of the pressure measurement increased significantly when time since awakening became greater than 21 h in almost all subjects. CONCLUSION: Based on this result, we propose a practical protocol that could robustly assess whether time since awakening was greater than 21 h.
Main Authors: | , , , , , , , , , , |
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Format: | Digital revista |
Language: | English |
Published: |
SBEB - Sociedade Brasileira de Engenharia Biomédica
2014
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Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-31512014000400005 |
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