Nineteen‐hour variation of postural sway, alertness and rectal temperature during sleep deprivation

Nakano, Takeo; Araki, Kyosuke; Michimori, Akihiro; Inbe, Hiroyuki; Hagiwara, Hiroshi; Emi, Kazuyuki

doi:10.1046/j.1440-1819.2001.00858.x

Cited by 69 publications

(97 citation statements)

References 2 publications

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“…The AAT method is excellent, because it differs from the conventional MSLT which is needed various experiment conditions and the point that objective wakefulness level can be presumed in a short time and by easy technique. Moreover it is suggested that AAT is based on the physiological phenomenon in which if sleepiness increases alpha wave decrease in closed eyes condition and increases in opened eyes condition, and also AAT have high sensitivity to the degree of awakening [18][19][20][21] . Therefore, AAT method would be suitable as an index which measures an wakefulness level by whole-body vibration exposure in a short-period, because it can measure in a short time and there is little pain to a subjections.…”

Section: Discussionmentioning

confidence: 99%

“…EEG was measured using an electroencephalograph (Nihon Kohden; Neuropack Four, Japan), and after FFT treatment (1 section 4-s, 100 Hz of sampling frequencies) using the [18][19][20][21][22][23] . When the power spectrum of alpha-wave becoming large during closed eyes, if a wakefulness level is high, blocking becomes remarkable during opened eyes and the power spectrum of alpha-wave decreases sharply.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Short-Term Exposure to Whole-Body Vibration on Wakefulness Level

et al. 2007

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To investigate the relationships between whole-body vibration and changes in wakefulness,We measured the change of a subjective wakefulness level and electroencephalogram (EEG). Subjects are ten healthy male university students. The subjects were exposed to whole-body vibration with frequency (10 Hz) and acceleration level (0.6 ms -2 r.m.s.) for 12 min in the seated position. Subjective wakefulness level was evaluated using the questionnaire of VASS (Visual Analog Sleepiness Scale) and KSS (The Kwansei Gakuin Sleepiness Scale). For the electroencephalogram (EEG) measurement, AAT (Alpha Attenuation Test) which repeats three times each opened and closed eye for 1 min was conducted. Wakefulness levels were defined as the ratio of mean alpha-wave power during eyes closed versus eyes opened. VASS and KSS increased and subjective level of wakefulness decreased from pre-to post exposure in all subjects, regardless of vibration exposure. The objective wakefulness levels of AAT were reduced at the post-exposure test in all subjects. In the case with exposure to whole-body vibration was a significant difference from the case without exposure to whole-body vibration. It is suggested that a short-term exposure to whole-body vibration may cause a reduction of wakefulness level.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of Short-Term Exposure to Whole-Body Vibration on Wakefulness Level

et al. 2007

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“…The frequency analysis of tremor intensity was conducted with the fast Fourier transform method. These functions did not seem to be affected by a diurnal variation because no special conditions such as sleep deprivation or night work existed [14][15][16] . Also, postural sway in children tends to be larger in boys than in girls, but tremor does not differ according to sex 17) .…”

Section: Methodsmentioning

confidence: 99%

Effects of Mixed Organic Solvents on Neuromotor Functions among Workers in Buddhist Altar Manufacturing Factories

Iwata

Mori²,

Dakeishi

et al. 2005

Journal of Occupational Health

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Effects of Mixed Organic Solvents on Neuromotor Functions among Workers in BuddhistAltar Manufacturing Factories: Toyoto IWATA, et al. Department of Environmental Health Sciences, Akita University School of Medicine-To clarify the neuromotor effects of long-term exposure to mixed organic solvents, postural sway and tremor were measured in 62 solvent workers of four Buddhist altar manufacturing factories who had worked for 1-46 (mean 12) yr. By using the passive gas sampler, 8-h time-weighted average concentrations in the workers were estimated to be 0.02-8.7 ppm for toluene, 0.02-7.7 ppm for xylene, 0.02-5.5 ppm for styrene and 0.02-40.5 ppm for n-hexane. Sagittal sway and sway area of the posturography with eyes closed were significantly larger in the solvent workers than in 35 age-matched controls (p<0.05), and there was a significant difference in Romberg quotient of sagittal sway between the two groups (p<0.05). Also, tremor intensities at 1.0-5.9 Hz, 6.0-9.9 Hz and 10.0-13.9 Hz with the right hand, and at 6.0-9.9 Hz with the left hand were significantly stronger in the solvent workers than in the controls. Among the solvent workers, transversal and sagittal sways with eyes open and tremor intensity at 10.0-13.9 Hz were significantly related to toluene exposure (p<0.05), which may have been due to the acute effects of such solvents. These findings suggest that longterm exposure to mixed organic solvents may impair neuromotor functions as measured by postural sway and tremor. (J Occup Health 2005; 47: 143-148)

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“…3,4 Mental fatigue can be subjectively assessed. It has, however, been shown that such an evaluation does not fully reflect the objective, physiological status of a tired person, mainly because subjective reports are biased by motivation, personal factors, experience and training.…”

Section: J Ma Y-j Yao R-m Ma Et Almentioning

confidence: 99%

“…In this context, the objective, computerized assessment of postural control, known to be intimately linked with neurophysiological processes affected by fatigue, appears to be a promising method of fatigue assessment. 3,4,11 It has been shown that postural stability and motor control are affected by > 19, 24 or 48 h of sleep deprivation, 4,9,12 -14 although the mechanism by which sleep deprivation exerts these effects has yet to be determined. The effect of sleep deprivation on postural sway is correlated with reduced levels of alertness, 9 peaking when the body temperature reaches its minimum.…”

Section: J Ma Y-j Yao R-m Ma Et Almentioning

confidence: 99%

Effects of Sleep Deprivation on Human Postural Control, Subjective Fatigue Assessment and Psychomotor Performance

et al. 2009

J Int Med Res

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This study aimed to investigate the effects of sleep deprivation on postural control, subjective fatigue assessment and psychomotor performance, and to assess the efficiency of an objective post urographic test as an indicator of mental fatigue. Postural sway using static posturography (Romberg's test), subjective fatigue assessment (Stanford Sleepiness Scale) and psychomotor performance (Sternberg dual-task test) were assessed in 12 subjects before and after 24 h of sustained wakefulness. After sustained wakefulness, the Romberg test parameters of circumference area and rectangle area with the eyes-closed, and standard deviation in the anterior-posterior direction with the eyes-open were significantly higher compared with baseline values (before sustained wakefulness). Subjective fatigue assessment scores were also significantly increased, while psychomotor performance was unchanged. Sleep deprivation can arouse a feeling of fatigue and can affect postural stability, hence an objective posturographic test score may be useful as an indicator of mental fatigue.

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Nineteen‐hour variation of postural sway, alertness and rectal temperature during sleep deprivation

Cited by 69 publications

References 2 publications

Effects of Short-Term Exposure to Whole-Body Vibration on Wakefulness Level

Effects of Short-Term Exposure to Whole-Body Vibration on Wakefulness Level

Effects of Mixed Organic Solvents on Neuromotor Functions among Workers in Buddhist Altar Manufacturing Factories

Effects of Sleep Deprivation on Human Postural Control, Subjective Fatigue Assessment and Psychomotor Performance

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