An Initial Evaluation of Work Fatigue and Circadian Changes as Assessed by Multiplate Posturography

Kohen-Raz, Reuven; Himmelfarb, Mordechai; Tzur, S.; Kohen-Raz, A; Shub, Y.

doi:10.2466/pms.1996.82.2.547

Cited by 56 publications

(64 citation statements)

References 2 publications

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“…These studies have recorded balance during at least 19 h of sustained wakefulness, and suggest that sleepiness impairs balance [46,[64][65][66][67][68]. Studies that have recorded balance during 8 h work shifts support this finding, by reporting that work stress and fatigue impair balance [8,69]. These studies have suggested that clinical balance examinations should take into account the time of day.…”

Section: Sleepiness Circadian Rhythm Stress and Fatiguementioning

confidence: 98%

“…The reason is that static posturography can detect balance changes related to circadian variations [33,46,[64][65][66][67]69] and should therefore be able to detect homeostatic changes. Moreover, static posturography is a clinical and commercialized technique -i.e.…”

Section: Posturographymentioning

confidence: 99%

“…Static posturography identifies balance changes related to normal ageing [71,72] and circadian variations [33,46,[64][65][66][67][68][69]. Moreover, generally the daily [87], weekly [88], and monthly [88] test-retest reliability of static posturography is reported to be high, -but there are reports on low reliability [89].…”

Section: Validity and Repeatability Of Posturographymentioning

confidence: 99%

“…Fatigue-related balance deficits are well documented; postural sway increases due to declining balance during 5 to 8 h work shifts [8,69]. Studies that have monitored balance during sustained wakefulness -minimum 19 h-show that balance varies with the time of day [33,46,[64][65][66][67][68].…”

Section: Balance Testing During Sustained Wakefulnessmentioning

confidence: 99%

“…An approach could be to measure time awake, because sleepiness increases as time awake increases [23,25]. Moreover, balance declines as time awake increases [8,33,46,[64][65][66][67][68][69]. These two relations advocate developing a posturographic time awake tester that could provide an estimate of sleepiness.…”

Section: Need For Study and Contribution Of The Thesismentioning

confidence: 99%

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Quantifying time awake posturographically

Forsman

Wallin

Tietäväinen

et al. 2008

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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This thesis focuses on the issue of testing sleepiness quantitatively. The issue is relevant to policymakers concerned with traffic-and occupational safety; such testing provides a tool for safety legislation and -surveillance. The findings of this thesis provide guidelines for a posturographic sleepiness tester.Sleepiness ensuing from staying awake merely 17 h impairs our performance as much as the legally proscribed blood alcohol concentration 0.5‰ does. Hence, sleepiness is a major risk factor in transportation and occupational accidents. The lack of convenient, commercial sleepiness tests precludes testing impending sleepiness levels -contrary to simply breath testing for alcohol intoxication. Posturography is a potential sleepiness test, since clinical diurnal balance testing suggests the hypothesis that time awake could be posturographically estimable. Relying on this hypothesis this thesis examines posturographic sleepiness testing for instrumentation purposes.Empirical results from 63 subjects -for whom we tested balance with a force platform during wakefulness for maximum 36 h-show that sustained wakefulness impairs balance. The results show that time awake is posturographically estimable with 88% accuracy and 97% precision -which validates our hypothesis. Results also show that balance scores tested at 13:30 hours serve as a threshold to detect excessive sleepiness. Analytical results show that the test length has a marked effect on estimation accuracy: 18 s tests suffice to identify sleepiness related balance changes, but trades off some of the accuracy achieved with 30 s tests.The procedure to estimate time awake relies on equating the subject's test score to a reference table (comprising balance scores tested during sustained wakefulness, regressed against time awake). Empirical results showed that sustained wakefulness explains 60% of the diurnal balance variations, whereas the time of day explains 40% of the balance variations. The latter fact implies that time awake estimations also must rely on knowing the local times of both test and reference scores. Hypothesis ORIGINAL PUBLICATIONSI. E H ae g g s t r ö m , P Forsman, A Wallin, E Toppila and I Pyykkö. Evaluating S l e e p i n e s s u s i n g F o r c e P l a t f o r m P o s t u r o g r a p h y . I E E E T r a n s B VI. P Forsman, A Tietäväinen, A Wallin, E Toppila, and E Haeggström. Balance control impairment during sustained waking allows posturographic sleepiness testing. J Biomechanics. In press. AUTHOR'S CONTRIBUTIONThe thesis's author designed studies I, III, and IV, performed the measurements in I and III, supervised the measurements in IV, analyzed the results in I-VI, ideated and designed publications II-IV and VI, authored publications II-VI, and co-authored publication I. PUBLICATION SUMMARIESPaper I shows that human balance impairs monotonically with increasing time awake, concurrent with the diurnal balance variation. With 21 subjects we show that the rate of monotone impairment allows separating balance scores recorded at ...

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Section: Sleepiness Circadian Rhythm Stress and Fatiguementioning

confidence: 98%

Section: Posturographymentioning

confidence: 99%

Section: Validity and Repeatability Of Posturographymentioning

confidence: 99%

Section: Balance Testing During Sustained Wakefulnessmentioning

confidence: 99%

Section: Need For Study and Contribution Of The Thesismentioning

confidence: 99%

See 3 more Smart Citations

Quantifying time awake posturographically

Forsman

Wallin

Tietäväinen

et al. 2008

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Balance as a measurement of fatigue in postcall residents

et al. 2014

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Surgical treatment of otosclerosis leading to changes in postural control and quality of life

et al. 2019

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Objective Evaluating postural function in patients with otosclerosis by assessing otoneurological function and balance‐related quality of life before and 6 weeks after surgical treatment. Correlations between and clinical features were investigated. Methods Thirty‐three patients affected by otosclerosis underwent otoneurological examination, video Head Impulse Test (vHIT), and static posturography before and after stapedotomy. Quality of life and dizziness‐related handicap were screened by means of validated questionnaires. Correlation analysis was performed in order to discover possible relations with audiological pre‐ and postoperative parameters. Results A significant improvement in posturographic parameters was found. Correlation analysis yielded a negative correlation between preoperative bone conduction auditory threshold and both vHIT scores and postural performance improvement, evaluated by spectral analysis. Moreover, a positive correlation was also found between improvements in posturographic scores and quality‐of‐life questionnaires. Conclusion The study results demonstrated an improvement in postural function and self‐reported measures in a cohort of patients with otosclerosis 6 weeks after stapedotomy. The inverse correlation with preoperative auditory levels may reflect lesser chance for balance restoration in cases with worse sensorineural function. Possible implications for daily activities and overall quality of life were suggested by improved self‐report questionnaire results. Level of Evidence 4 Laryngoscope, 130:2448–2454, 2020

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An Initial Evaluation of Work Fatigue and Circadian Changes as Assessed by Multiplate Posturography

Cited by 56 publications

References 2 publications

Quantifying time awake posturographically

Quantifying time awake posturographically

Balance as a measurement of fatigue in postcall residents

Surgical treatment of otosclerosis leading to changes in postural control and quality of life

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