J. Fukushige et al., INFLUENCE OF UPRIGHT ACTIVITY ON PLASMA-RENIN ACTIVITY AND ALDOSTERONE CONCENTRATION IN CHILDREN, European journal of pediatrics, 153(4), 1994, pp. 284-286
Plasma renin activity (PRA) and plasma aldosterone concentration (PAC)
were measured in 156 healthy infants and children under basal conditi
ons of normal diet and recumbency. PRA and PAC were also evaluated dur
ing and after stimulation of the renin-angiotension-aldosterone system
by postural change. Basal values of PRA significantly declined with i
ncreasing age. Postural change by standing up resulted in an increase
of PRA and PAC in all age groups. The increment of PRA but not of PAC
was greater in older than in younger children. Neither the basal nor t
he stimulated levels of PRA and PAC were influenced by sex, body weigh
t, body surface area, serum sodium, serum potassium, creatinine, and 2
4-h urine secretion of sodium and potassium. Both PRA and PAC returned
to the basal levels within 60 min after resuming recumbent posture.