passages.id: split_1_test_2171_passage
passages.type: progene_text
passages.text: The isotopic enrichments in urine and plasma sampled simultaneously 4 h post - DLW dose were compared in a subset of 281 subjects [ 139 women , 142 men , 75 +/- 3 ( SD ) yr ] of the 3,075 participants in the Health , Aging , and Body Composition study .