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Hysteresis in the sympathetic baroreflex: role of baseline nerve activity.

Artikel i vetenskaplig tidskrift
Författare Emma C Hart
Gunnar B Wallin
Timothy B Curry
Michael J Joyner
Tomas Karlsson
Nisha Charkoudian
Publicerad i The Journal of physiology
Volym 589
Nummer/häfte Pt 13
Sidor 3395-404
ISSN 1469-7793
Publiceringsår 2011
Publicerad vid Institutionen för neurovetenskap och fysiologi, sektionen för klinisk neurovetenskap och rehabilitering
Sidor 3395-404
Språk en
Länkar dx.doi.org/10.1113/jphysiol.2011.20...
Ämneskategorier Klinisk neurofysiologi

Sammanfattning

Sympathetic baroreflex sensitivity (BRS) is greater during decreasing compared to increasing diastolic blood pressure (DBP) in young men and women. In older men and women there is no difference in sympathetic BRS to increasing and decreasing DBP. We investigated whether the sensitivity of the central nervous system to increasing and decreasing DBP is dependent upon baseline muscle sympathetic nerve activity (MSNA). We hypothesised that the difference in sympathetic BRS between falling and rising segments of DBP would be positively related to baseline MSNA in 30 young men, 21 young women, 14 older men and 14 postmenopausal women. MSNA was measured using peroneal microneurography and BRS was measured using the spontaneous baroreflex threshold technique. On average, sympathetic BRS was greater during decreasing compared to increasing DBP in young men (P <0.05) and women (P <0.05). In older men and women, mean sympathetic BRS was similar in response to increasing and decreasing DBP. The difference (delta) between the falling and rising BRS correlated with baseline MSNA in young (r =0.58, P <0.05) and older men (r =0.66, P <0.05) and postmenopausal women (r =0.74, P <0.05). Thus, all men, and older women, with higher BRS to falling DBP had lower baseline MSNA. This relationship was not observed in young women (r =0.14, P >0.05). In summary, baseline MSNA plays a role in determining sympathetic BRS to falling and rising DBP in young and older men and postmenopausal women, but not in young women. This relationship is consistent with a decreased potential for sympathoexcitation in people with higher resting MSNA. Furthermore, the lack of relationship in young women suggests important contributions of sex hormones to differential responses of MSNA to falling and rising pressures.

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