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Heart rate increased during LBNP. High frequency oscillations in both SAP and DAP increased, but only at high levels of LBNP (��60 mmHg). Coherence between MSNA and both SAP and DAP was maintained at or above baseline levels throughout LBNP. Figure 1 depicts blood pressure and MSNA responses in a representative subject during progressive central hypovolaemia induced by LBNP. Reductions in stroke volume during LBNP (Table 1) were associated with increases in MSNA that were evident early in the course of LBNP (i.e. at ?30 mmHg). By ?60 mmHg, both MSNA and blood pressure demonstrated an increase in oscillatory patterns that became more pronounced at ?80 mmHg (Fig. 1). Group averages for MSNA burst frequency, total MSNA, low frequency oscillations in SAP (SAPLF) and MSNA (MSNALF) during LBNP are presented in Fig. 2. MSNA http://www.selleckchem.com/products/AZD0530.html increased progressively during LBNP, http://en.wikipedia.org/wiki/Diglyceride with a return to baseline levels upon cessation of LBNP. For the entire group of subjects, SAPLF and MSNALF increased from baseline only at high levels of LBNP (��60 mmHg). Relationships between mean values of SAPLF and MSNA parameters are shown in Fig. 3. Despite increases in sympathetic activation during even early levels of LBNP, SAPLF did not increase initially. Because of this, the association between SAPLF and direct measurements of MSNA (either MSNA frequency or total MSNA) were curvilinear rather than linear. Coefficients of determination (r2) assuming linear relationships were 0.73 and 0.84 for MSNA frequency and total MSNA, but rose to 0.89 and 0.98 when quadratic functions were used. In contrast, the relationship between SAPLF and MSNALF was highly linear (r2= 0.97). While group mean data demonstrated a strong curvilinear relationship between SAPLF and MSNA, plotting of the association between these variables during LBNP for each individual subject revealed a great deal of inter-individual variability (Fig. 4). Furthermore, coefficients of determination (r2) describing relationships between SAPLF http://www.selleckchem.com/products/GDC-0941.html and MSNA within each subject varied widely between subjects, whether calculated using linear or quadratic equations (Table 2). Indeed, 7 of 20 subjects (35%) demonstrated r2