Seasonal variation in human amino acid excretion

Abstract

Amino acid excretion was studied in young, healthy men during summer, fall and winter months in a southwestern U. S. location. Both untimed and timed urine samples were employed. The amino acids determined were alanine, arginine, cysteine, glutamic acid, glutamine, glycine, histidine, lysine, methyl histidine, serine, threonine and valine. Supplemental determinations included urine volume, creatinine, uric acid, urea, sodium and potassium. Using untimed urine samples and expressing values as ratios with creatinine, significant seasonal variation was found for alanine, arginine, cysteine, glutamic acid, glycine, lysine and serine. Submitted on April 11, 1959

Mechanisms, Instrumentation, Recording Techniques, and Quantification of Responses

“…Turning, finally, to the problem of climatic change as a variable in protracted studies, Wieland and Mefferd (1970) consider some aspects of this, citing Wenger (1943), Wenger and Cullen (1962), Mefferd (1959), and Hale, Ellis, and Van Fossan (1960). Wenger and Cullen (1962) noted that they were unable to replicate, in summer months, psychophysiological findings obtained in temperate periods; Christie and Venables (1971b) reported a similar inability to replicate, in summer months, findings on BSPL and ECG T-wave relationships.…”

Catecholamine Excretion in Heat-Acclimatized Men

“…Thi s'same . summer-autumn variation in the urea creatiOthers "iave studied the effects of acute nine ratio was found in an earlier study (12), heat expo.ýure on the human. Berman et al in which daytime urine, rather than nighttime (15) found no evidence of high c atecholamine urine, was analyzed.…”