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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Regul+Integr+Comp+Physiol
2008 ; 295
(3
): R727-32
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Influence of sedentary versus physically active conditions on regulation of
plasma renin activity and vasopressin
#MMPMID18509102
Mueller PJ
Am J Physiol Regul Integr Comp Physiol
2008[Sep]; 295
(3
): R727-32
PMID18509102
show ga
Physical inactivity is an independent risk factor for cardiovascular disease.
Sedentary animals compared to physically active controls exhibit enhanced
sympathoexcitatory responses, including arterial baroreflex-mediated
sympathoexcitation. Hypotension-induced sympathoexcitation is also associated
with the release of vasoactive hormones. We hypothesized that sedentary
conditions may enhance release of the vasoactive hormones AVP and ANG II. To test
this hypothesis, the humoral response to hypotension was examined in conscious
rats after 9-12 wk of sedentary conditions or "normally active" conditions.
Normally active conditions were produced by allowing rats access to running
wheels in their home cages. Running distance peaked after 4 wk (4.5 +/- 0.7
km/day), and the total distance run after 9 wk was 174 +/- 23 km (n = 25).
Similar levels of hypotension were induced in conscious sedentary or physically
active animals with the arterial vasodilator, diazoxide (25 mg/kg iv). Control
experiments used a saline injection of equivalent volume. Plasma samples were
collected and assayed for plasma AVP concentration and plasma renin activity
(PRA). Sedentary conditions significantly enhanced resting and
hypotension-induced PRA relative to normal physical activity. In contrast,
resting and hypotension-induced AVP levels were not statistically different
between groups. These data suggest that baroreflex-mediated activation of the
renin-angiotensin system, but not AVP secretion, is enhanced by sedentary
conditions. We speculate that augmented activation of the renin-angiotensin
system may be related to enhanced sympathetic outflow observed in sedentary
animals and may contribute to increased risk of cardiovascular disease in the
sedentary population.