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Spectral analysis in cyclic changes of human sleep evaluation

100%
Pracka D., Pracki T.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 1
255-258
EN
In this study cyclic changes of human sleep structure were examined. For whole-night polysomnograms of 35 healthy volunteers of both sexes, manual hypnograms were created and divided into NREM-REM cycles. EEG signals from C3-A2 derivation were analysed by computer using Fast Fourier Transform (FFT). For consecutive NREM-REM cycles of individual sleep stages, EEG power density contents for delta, theta, alpha, sigma, and beta waves were analysed. For consecutive sleep cycles, a clear decrease in NREM sleep duration, especially slow wave sleep duration, was obtained. In addition, a decrease in power density of delta waves was observed. For consecutive sleep cycles, increases in REM sleep duration and in power density of theta and alpha waves were obtained. In consecutive sleep cycles, high amplitude delta slow waves are replaced by higher frequency and lower amplitude waves. Thus stages of NREM sleep are replaced by stages of REM.
2
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Effect of lateral hypothalmic lesion on sleep-waking pattern and EEG power spectra in the rat

81%
Jurkowlaniec E., Pracki T., Trojniar W., Tokarski J.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 1
249-253
EN
Bilateral, electrolytic lesion of the lateral hypothalamus (LH) in rats produces hyposomnia and qualitative EEG changes which are difficult to assess by convencional visual inspections of electroencephalograms. In the present study the spectral analysis of EEG was applied in LH-lesioned rats and confronted with standart visual scoring method. One-hour samples of hippocampal and cortical EEG were taken from the light part of the circadian cycle before and after electrolytic or sham LH damage. In half of the LH-lesioned rats a power spectral analysis was performed using a Fast Fourier Transform routine at 1 Hz bands from 0.5 to 25 Hz; in the other half, as well as in the sham-lesioned group, EEG records were visually scored for the amount of waking, slow wave sleep and paradoxical sleep. Significant hyposomnia effects were found in LH-lesioned rats. Power spectral analysis of hippocampal EEG revealed a significant increase in power density at 4-6 Hz and reduction at 7-10, 14-17, 19-22 and 23-24 Hz. In neocortical EEG there was a significant increase in power density at 5-6 Hz band and reduction at 7-8 Hz. The results are discussed in the context of the effects of selective desrtuction of the specific neurotransmitter systems occupying the LH area.
3
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The modified Color Density Spectral Array - an alternative method for sleep presentation

61%
Pracki T., Pracka D., Ziolkowska-Kochan M., Tafll-Klawe M., Szota A., Wilkosc M.
Acta Neurobiologiae Experimentalis
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2008
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vol. 68
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issue 4
516-518
EN
patterns is described in this article. CDSA was presented for the first time in 1987 by M. Salinsky and coauthors. This method was adapted to display frequency course and voltage of EEG signal during sleep. The overnight sleep records of 35 healthy volunteers of both sexes (23 women, 12 men; aged 1926) were analyzed in order to verify the modification of CDSA method. We propose to use combining the hypnogram and CDSA method significantly increases the informative value of data and results in enhanced quality of sleep analysis.
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