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Nitrogen balance adapts to changes in habitual protein intake within a few days in Japanese male athletes
Author(s) -
Yokota Yukari,
Tatsuta Wakako,
Kamei Akiko,
Kondo Emi,
Kawahara Takashi,
Okamura Koji
Publication year - 2011
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.25.1_supplement.983.9
Subject(s) - excretion , meal , nitrogen balance , urine , zoology , athletes , medicine , urine sample , chemistry , nitrogen , endocrinology , biology , physical therapy , organic chemistry
Eighteen healthy adult male Japanese athletes consumed meals containing 1.5 g/kg BW/day (P1.5) and 2.5 g/kg BW/day (P2.5) protein for 10 days, in a different order during a 20 day study to investigate the effect of a sudden change of habitual protein intake on nitrogen balance. Eleven subjects were consumed P1.5 from day 1 to 10 then switched to P2.5 from day 11 to 20 (P1.5/2.5), while 7 subjects were tested in the opposite order (P2.5/1.5). Urine samples were collected during the first and the last 3 consecutive days both before and after the meal switch; days 1–3 and days 8–10 of the 1st meal, days 11–13 and days 18–20 after the meal switch. Urinary nitrogen excretion significantly changed immediately in both groups after changing meals and did not change thereafter. The average of each urine sample period was 13.5, 13.4, 17.9 and 19.9 g/day for P1.5/2.5, and 17.5, 18.4, 14.1 and 13.5 g/day for P2.5/1.5. The nitrogen balance showed similar change as nitrogen excretion; 10.9, 11.2, 17.7 and 16.1 g/day for P1.5/2.5, and 16.1, 16.2, 9.2 and 11.1 g/day for P2.5/1.5. Therefore, both urinary nitrogen excretion and the nitrogen balance seems to adapt to both an increase and a decrease in the habitual protein intake within a few days in Japanese male athletes.