276 



METABOLISM DURING WALKING. 



are those due to natural radiation and convection as affected by the 

 very light-weight clothing which the subject wore at the time. 



Although the temperatures obtained in this study do not show equal 

 increases for similar amounts of work on different days, yet a higher 

 temperature and a greater increase over the normal temperatures dur- 

 ing standing were usually observed when the work and the metabolism 

 were greatest. As was found with the pulse-rate, there is evidently 

 a general relation between the amount of work and body-temperature. 



BLOOD-PRESSURE DURING GRADE WALKING. 



The few readings of the blood-pressure of E. D. B. were made when 

 but small amounts of work were done. Consequently the effect of 

 work on the blood-pressure was not large. As previously stated, these 

 readings were of the systolic pressure only, and were made with the 

 subject standing after a preliminary walking period and again just 

 after the experimental period closed. The results of these measure- 

 ments, which comprise those for 7 days with grade walking, are given 

 in table 16a, page 88. 



TABLE 80. Blood-pressure of E. D. B. during grade walking in experiments without food. 



(Values per minute.) 



Excepting for the first period of April 6, the records show close agree- 

 ment for the periods of the same day, with a slight tendency to increase 

 during the forenoon. The blood-pressure increased over the standing 

 values in all instances, as may be seen from table 80, in which both 

 these values and the kilogrammeters of work done are given. The 

 range of increase was from 4 to 14 mm., with an average value of 10 

 mm. The blood-pressure for the walking period of March 23 is proba- 

 bly too low, as there was a lapse of 2 minutes after the walking ceased 

 before the pressure was read. 



There appears to be no indication in these figures of direct connection 

 between the amount of work performed and the blood-pressure, but 

 up to a certain point it appears that the increase in the blood -pres- 

 sure found during grade walking over the values obtained with the 

 subject standing is inversely proportional to the amount of work 



