Increased tolerance to @entity3485 is generally associated with greater sympathoexcitation, high-frequency oscillatory patterns of mean arterial pressure (MAP), and @entity591 . On average, @entity1 are less tolerant to @entity3485 than @entity1 ; however, the autonomic mechanisms governing these comparisons are not fully understood. We tested the hypothesis that @entity1 with relatively @entity2101 ( @entity2101 ) to @entity3485 would display similar physiological reserve capacity for sympathoexcitation and oscillations in MAP at @entity1163 compared to @entity2101 @entity1 . About 10 @entity1 and five @entity1 were exposed to progressive lower body negative pressure (LBNP) until the presence of @entity1163 . Based on our previous classification system, all subjects were classified as @entity2101 because they completed at least -60  mmHg LBNP. Muscle sympathetic serve activity (MSNA) was measured directly from the peroneal nerve via microneurography and arterial pressure (AP) was measured at the finger by photoplethysmography. LBNP time to @entity1163 was less (P  <  0.01) in @entity1 (1727      70  sec) than in @entity1 (2022      201  sec). At @entity1163 , average MSNA in @entity1 (50      12 bursts/min) and @entity1 (51      7 bursts/min) was similar (P  =  0.87). Coincident with similar @entity64 volume (SV) at @entity1163 , @entity1 had similar MAP and heart rates. However, @entity1 had less physiological reserve capacity for SV, AP-MSNA coherence, and oscillations in the high-frequency (HF) components of arterial pressure compared to @entity1 . Contrary to our hypothesis, lower tolerance to @entity3485 in @entity1 was not associated with sympathoexcitation, but can be explained, in part by lower physiological reserve to elicit oscillatory patterns in AP, maintenance of AP-MSNA coherence and SV when compared to @entity1 .

Sex comparisons in muscle sympathetic nerve activity and arterial pressure oscillations during progressive XXXX .

@entity1 :: ('9606', 'Species') :: ['women', 'men'] @entity64 :: ('MESH:D020521', 'Disease') :: ['stroke'] @entity1163 :: ('MESH:D013575', 'Disease') :: ['presyncopal symptoms', 'presyncope'] @entity591 :: ('MESH:D013610', 'Disease') :: ['tachycardia'] @entity2101 :: ('MESH:C538394', 'Disease') :: ['HT', 'high tolerance'] @entity3485 :: ('MESH:D020896', 'Disease') :: ['central hypovolemia']
@entity3485 :: (MESH:D020896,Disease) :: ['central hypovolemia']
