Lxxx. Day and Night Urine during Complete Rest, Laboratory Routine, Light Muscular Work and Oxygen Administration.- by James Argyll Campbell and Thomas Arthur

BY employing the same subject under varying daily routines it was thought that some information might be obtained regarding the problems of nitrogen metabolism and urinary excretion, if close attention were directed to the composition of the day and night urine. The present results were obtained during three 5-day periods: (i) complete rest in bed, (ii) 61 hours' ordinary laboratory routine, (iii) 14 hours' ordinary laboratory routine plus 5 hours' work-13,500 kgm. per hr.-on Schuster's [1921] modification of Martin's bicycle ergometer. For brevity these periods will be called "rest routine," "ordinary routine," and "ergometer routine" respectively. During the "ergometer routine" the subject may be considered to have carried out half-a-day's work of a labourer. The subject, 28 years of age, 161-2 cm. in height, and 52X4 kgm. in weight, was a skilled laboratory assistant, and accustomed to this type of research. During six months of observation his total nitrogen excretion averaged 9 g. His usual diet was taken, but was controlled mainly to exclude articles which are known to influence greatly the composition of the urine. The average daily diet for each of the 5-day periods was similar in substance. Breakfast was taken about 7.30 a.m., dinner at 1 p.m., light tea at 4 p.m., and supper at 7.30 p.m. Well-known standard methods were used for the analyses and the average results are given in the appended table.