The aim of the study was to identify the contribution of myelinated (A-fiber) and unmyelinated (C-fiber) baroreceptor central pathways to the baroreflex control of sympathetic nerve activity (SNA) and arterial pressure (AP), in anesthetized Wistar-Kyoto (WKY, n = 8) and spontaneously hypertensive rats (SHR, n = 8). The left aortic depressor nerve (ADN) was electrically stimulated with two types of binary white noise signals designed to preferentially activate A-fibers (A-BRx protocol) or C-fibers (C-BRx protocol). In WKY, the central arc transfer function from ADN stimulation to SNA estimated by A-BRx showed strong derivative characteristics with the slope of dynamic gain between 0.1 and 1 Hz (Gslope) of 14.63±0.89 dB/decade. In contrast, the central arc transfer function estimated by C-BRx exhibited non-derivative characteristics with Gslope of 0.64±1.13 dB/decade. This indicates that A-fibers are important for rapid baroreflex regulation, whereas, C-fibers are likely important for more sustained regulation of SNA and AP. In SHR, the central arc transfer function estimated by A-BRx showed higher Gslope (18.46±0.75 dB.decade, P < 0.01), and that estimated by C-BRx showed higher Gslope (8.62±0.64 dB/decade, P<0.001) with significantly lower dynamic gain at 0.01 Hz (6.29±0.48 vs. 2.80±0.36 %/Hz, p<0.001) compared with WKY. In conclusion, the dynamic characteristics of the A-fiber central pathway are enhanced in the high modulation frequency range (0.1-1 Hz) and those of the C-fiber central pathway are attenuated in the low modulation frequency range (0.01-0.1 Hz) in SHR.