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Endogenous Nitrogen Excretion in Male Highlanders of Papua New Guinea¹

Yoshiaki Fujita², Toyoko Okuda^*, Toru Rikimaru, Mineko Ichikawa, Shuichi Miyatani, Naemi M. Kajiwara, Yoneko Yamaguchi, Yuriko Oi^*, Hideo Koishi^*, Michael P. Alpers^|| and Peter F. Heywood^||

Nutrition Research Laboratory, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan ^* Faculty of the Science of Living, Osaka City University, Osaka City, Japan Department of Home Economics, Yamaguchi Women's College, Yamaguchi City, Japan Department of Home Economics, Kobe Women's College, Kobe, Japan Kohno Food Research Institute, Osaka, Japan ^|| Papua New Guinea Institute of Medical Research, Goroka, Papua New Guinea

Endogenous nitrogen excretion was examined in highlanders of Papua New Guinea. Eight highlanders were fed a semisynthetic protein-free diet with about 49 kcal/kg of energy for 11 days. At the end of this period they excreted 29.2 ± 4.0 mg N/kg of urinary nitrogen and 13.9 ± 2.5 mg N/kg of fecal nitrogen per day. When the values were expressed per basal metabolic rate (BMR), they were 1.25 ± 0.19 mg N/kcal BMR for urine and 0.59 ± 0.08 mg N/kcal BMR for feces. The total amount was calculated as 43.1 ± 4.3 mg N/kg (1.84 ± 0.18 mg N/kcal BMR). Endogenous urinary nitrogen excretion in highlanders was the lowest so far reported; the effects of ethnic and nutritional backgrounds on obligatory urinary N loss were examined but no clear explanation was found for the highlanders' low value.

KEY WORDS: • endogenous nitrogen excretion • Papua New Guinea highlanders • protein-free diet • ethnic and nutritional backgrounds

¹ Supported by Grant 56043051 from the Ministry of Education, Science and Culture of Japan.

² Address reprint requests to: Y. Fujita, Ph.D., Nutrition Research Laboratory, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabashi-ku, Tokyo 173, Japan.

Manuscript received 17 April 1984.

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