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In thirty-seven children free of neurological symptoms, we attempted the quantitative
analysis of EEG slowing during standarized hyperventilation activation, respiration
rate of 30/min, a three-fold elevation of VE and duration of 4 minutes. The degree
of build-up gradually became mild with increasing age and no build-up was observed
in the subjects older than 14 years old. Fast Fourier Transform analysis of the build-up
showed that a big build-up was due to both increasing delta and theta power, and markedly
decreasing alpha power with markedly increasing total power, and the mild build-up
was due predominantly to increasing theta power. These changes disappeared, the levels
before the activation being attained again, within one minute after the hyperventilation
in almost all subjects. As to age differences in EEG slowing during hyperventilation,
an incerase in both delta and theta activity was observed in the younger subjects
(6–9 years old), and a mild increase in theta activity was predominantly observed
in adolescents. On topographic analysis of EEG slowing, the delta power was found
to have expanded to the posterior area and the theta power to have expanded to become
diffuse. The standardization of hyperventilation in childhood is important for judgement
of the build up because of these age differences, and also may be useful for understanding
the development of the central nervous system.
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Article info
Publication history
Accepted:
August 25,
1986
Received:
February 17,
1986
Identification
Copyright
© 1987 Published by Elsevier Inc.
