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| Titel: |
Power spectra of blood pressure and heart rate fluctuations during mental load |
| Auteur: |
Honzikova, N. Penaz, J. Fiser, B. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 19 (1988) nr. 1 pagina's 75-79 |
| Jaar: |
1988-03 |
| Inhoud: |
The aim of the present paper was a search of a respiration-independent factor changing the power spectra of circulatory parameters during mental load. Blood pressure, heart rate and respiratory movements were recorded in 12 subjects (age 19-23) in 4 experimental periods, 5 minutes each: at rest - period 1 - and during a mental load (discrimination between 3 tones of different pitch) - period 2. Then the record of respiration from periods 1 and 2 was replayed on the oscilloscopic screen and the subject had to reproduce his own previous respiratory movements - period 3 and 4. The power spectra of all parameters recorded in periods 1 and 3, and 2 and 4 were compared; the reproduction of the respiration as a week mental load was taken into consideration. There is some tendency of mental load to damp the power spectral density of circulatory parameters in all frequency ranges (minutes waves, 10-second rhythm and respiratory oscillations), but in some subjects expressive opposite changes occurred. We did not find any respiration- independent change in circulatory spectra stable enough to make possible the use of spectral analysis to measure the mental load intensity. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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