Hypertension, Vol 4, 805-808, Copyright © 1982 by American Heart Association
FC Luft, NS Fineberg and RS Sloan
Previous investigations examining techniques to estimate sodium intake in
free-living persons failed to consider a varying intake or were not
conducted under circumstances in which the intake was actually known. To
examine the utility of 24-hour and nocturnal urine collections as
estimation of sodium intake under such conditions, we studied 43 white and
black men and women ingesting a known sodium intake for 10 days that was
randomly varied daily, with a mean intake of 150 mEq/day + 2 SD (range, 50
to 250 mEq/day). The mean 24-hour sodium excretion (UNaV) per day was and
24-hour UNaV estimated that day's sodium intake accurately for the entire
10 days, the average of several 24-hour collections was required. Nine
collections were optimal (r = 0.75). Nocturnal specimens were not helpful;
the average of all 10 collections correlated weakly (r = 0.30) with sodium
intake. These data suggest that to estimate mean sodium intake accurately
in free-living persons, only 24-hour collections are useful, although
nocturnal collections are helpful in evaluating compliance with low sodium
intake.
ARTICLES
Estimating dietary sodium intake in individuals receiving a randomly fluctuating intake
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