SUMMARY OF RESULTS. 691 



The pulse for 1 minute after work on the ergometer shows up to 

 December 8 very much the same trend as do the other pulse-rate 

 curves. On December 10 there is a large increase and inmiediately 

 following the return from the Christmas recess there is a pronounced 

 fall to the end of the restricted-diet period. The striking increase 

 after the restricted diet ends, noted with the pulse 1 minute before 

 work, is here even more accentuated. 



As an index of the reaction of the heart to a definite amount of 

 work, the percentage increase in the pulse-rate 1 minute after work 

 ceases is of interest, this representing in a sense the increment of the 

 pulse-rate expressed in percentages for accomplishing a definite amount 

 of work. This curve shows an extremely irregular contour, the highest 

 point being reached about November 15, the lowest point just before 

 the end of the observations. In comparing the number of minutes 

 required for the pulse-rate to return to the normal after a definite 

 amount of work, it appears that the curve for this factor and that for 

 the percentage increase 1 minute after the ergometer riding are more 

 or less parallel, and this is true until the return from the Christmas 

 recess. After this point the curves are in most instances opposed to 

 each other. It is worthy of note that with the percentage increase 1 

 minute after work there is a great decrease on the whole after the diet 

 restriction ceases and a high point in the time required for the pulse- 

 rate to return to normal after work, although the absolute maximum is 

 noted on November 14. 



Since the gaseous metabolism plays so important a role in our study 

 of the total metabolism, the factors entering into the gaseous meta- 

 bolism, as well as the heat calculations therefrom, are represented by 

 several curves in figure 124. 



The average total basal heat production for this group of men per 24 

 hours may first be considered. Although there are very wide fluctua- 

 tions from day to day, as indicated by the rise and fall in the curve, the 

 general trend is distinctly downward, save for the high points on 

 November 26 and December 10 following the uncontrolled Sundays and 

 likewise the initial high point following the Christmas recess in the 

 early part of January. Thereafter during January there is a steady 

 decline, with a minimum on January 24 and a tendency to a slight rise 

 thereafter. Since the body-weight was changing throughout the experi- 

 ment, it is quite obvious that not only the total heat per 24 hours should 

 be considered, but particularly the heat per unit of body-weight and 

 likewise in this homogeneous group of subjects the heat per square 

 meter of body-surface. The curves assigned to both of these factors 

 show remarkable uniformity and agree in the main with the total heat- 

 production curves — a pronounced drop during the first weeks of the 

 season, sharp rises on November 26, December 10, and after the Christ- 



