The presence of coherence in sympathetic and phenic activities in a developing mammal
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To determine whether are devalopment changes in the baroreceptor and central respiratory modulation of sympathetic activity, we used ordinary and partial cohernce spectral analyses on cervical and splanchnic sympathetic activity in swine 1-36 days old. Removal of barareceptor influences from cervical sympathetic and splanchnic spectra using partialization shows that 3-6 Hz peaks are due to baroreceptors since coherence decreased in more then 19 days old while remaining unchanged in less then 2 weeks old piglets. The 8-12 Hz band (present in normal coherence after 21 days) was revealed in piglets less then 14 days old after removal of respiratory modulation by partialization; similarly increrased coherence was also observed in the 16-18 Hz band through 3 weeks. Thus, use of partial power and coherency is useful tool for unmasking the complex relationships found in developing SYMP outflows. These results suggest that there is a period of reorganization within the SYMP rhythm generating circuits, which may be essential for normal development.
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