Robertson W G, Hodgkinson A, Marshall D H
Clin Chim Acta. 1977 Oct 15;80(2):347-53. doi: 10.1016/0009-8981(77)90043-2.
The volume, pH and composition of 24-h urine samples, collected by 13 healthy male adults, were followed over a period of one year. Significant and systematic variations in urine pH, calcium, phosphate, oxalate, uric acid, potassium and magnesium were observed. A significant but non-sinusoidal variation in sodium excretion was found but there were no significant changes in urinary volume, creatinine or hydroxyproline. Many of the observed changes could be attributed to variations in the pattern of food consumption throughout the year but calcium, phosphate and oxalate were exceptions in that seasonal variations in these parameters appeared to be due to the effects of sunlight (or vitamin D) rather than to the diet.
13名健康成年男性收集的24小时尿液样本的体积、pH值和成分，在一年的时间里进行了跟踪监测。观察到尿液pH值、钙、磷酸盐、草酸盐、尿酸、钾和镁存在显著且有规律的变化。发现钠排泄存在显著但非正弦曲线的变化，但尿量、肌酐或羟脯氨酸没有显著变化。许多观察到的变化可归因于全年食物消费模式的变化，但钙、磷酸盐和草酸盐是例外，因为这些参数的季节性变化似乎是由于阳光（或维生素D）的影响而非饮食。
