Modeling balance control during sustained waking allows posturographic sleepiness testing

Journal of Biomechanics
P ForsmanE Haeggström

Abstract

We develop a method to quantify sleepiness. Sleepiness is a major risk factor in traffic and occupational accidents, but lack of convenient tests precludes monitoring impending sleepiness. Posturographic balance testing could address this need because sleepiness increases postural sway. It is, however, unclear how sleepiness influences balance control. Our results, for 12 subjects, show that balance control is more susceptible to increasing time awake (TA) compared to neuromuscular processes. This conclusion is reached since during sustained waking the control process slows down by 3.4% per hour of increased TA. This slowdown accounts for 65% of the variance in diurnal balance. We quantified balance control by modeling the body as an inverted pendulum and by expressing the control as the critical time interval for open-loop control (Deltat(c)) of the center-of-mass movements of this pendulum. To estimate the subjects' TA, we regressed the Deltat(c) scores recorded during sustained waking against increasing TA, and equated separate Deltat(c) test scores with the diurnal Deltat(c) scores. We estimated TA with 68% positive predictive value. The results encourage implementing balance modeling into a device that performs clinical or...Continue Reading

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Citations

Dec 29, 2010·Experimental Brain Research·Clement BougardDamien Davenne
Jul 24, 2012·Experimental Brain Research·Simon S SmithGraham K Kerr
Feb 12, 2014·International Archives of Occupational and Environmental Health·Tobias PetersBarbara Wilhelm
Jan 18, 2012·Accident; Analysis and Prevention·Charli SargentGregory D Roach
Apr 27, 2016·PloS One·Fernanda Veruska NarcisoMarco Túlio de Mello
Sep 2, 2011·Current Opinion in Pulmonary Medicine·Fernando M S CoelhoBrian J Murray
May 1, 2021·International Journal of Environmental Research and Public Health·Marta Ołpińska-LischkaJanusz Maciaszek
Sep 11, 2021·Aerospace Medicine and Human Performance·Shan ChengWendong Hu

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