[Cross-spectral analysis of the stroke blood volume oscillations and R-R interval duration among men during different loadings].
The correlation of the stroke blood volume oscillations and the R-R interval duration was investigated among 125 healthy young men at rest, with controlled breathing, at tilt test, with mental and physical loadings with the help of the cross-spectral analysis. Maximums and minimums of the cross-spectral power for these indexes were found to be groupped in three frequency ranges: 0-0.04 Hz, 0.07-0.13 Hz and 0.15-0.4 Hz. The positive tops of the cross-spectral power had the biggest amplitude in the 0-0.04 Hz, 0.07-0.13 Hz frequency ranges in the most conditions; negative tops stipulated with breathing--in the 0.15-0.4 Hz frequency ranges. The structure of the cross-periodgrams changed reliably with different loadings if compared with lying position at rest. The maximum top amplitude of the cross-periodgram was reproduced at the largest extent with repeated changes in 235 +/- 31 days in the ranges of 0.07-0.13 Hz, having median frequency of 0.09-0.01 Hz in all conditions.
Kovalenko
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D000293:Adolescent; D000328:Adult; D003627:Data Interpretation, Statistical; D004562:Electrocardiography; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D013318:Stroke Volume / Q000502:physiology*; D013850:Thinking / Q000502:physiology*