PULSE-RATE. 433 



The curve of Can (figure 98) shows a fall at the fourth beat following 

 the initial rise as walking began, but the whole curve has more or less 

 a succession of waves, indicating a rhythm in the pulse-cycle duration. 

 An inspection of the intervals of these waves and of Can's respiration 

 rate shows no relation between these two factors. This rhythm is 

 likewise apparent in the transition curve of standing following walking. 

 In this curve the changes in the duration of the cycle appear, which 

 have been noted with other subjects, but the lengthening of the pulse 

 is not persistent as with most of the other standing curves, and by the 

 end of the record at 30.6 seconds the duration of the cycles is as short 

 as during the walking period. 



The curve of Kon for walking (figure 98) shows rather large fluctua- 

 tions in the length of the pulse cycle. The duration lengthens after 

 the sixth beat, and the following cycles show some indications of 

 periodicity. There is absent here the tendency to a permanent short- 

 ening of the duration of the pulse cycle. The final transition shows a 

 sharp change from the walking rate without the tendency to return 

 temporarily to the shorter cycle. By the end of the record, at the 

 twenty-sixth cycle, the duration is 1.23 seconds, or the same as the 

 preliminary standing pulse. 



In the curve of Gar (figure 98) only 35 seconds of the walking transi- 

 tion are shown, but the lengthening of the pulse cycle after the first 

 reaction to walking is seen between the fourteenth and the twentieth 

 cycles, when the duration changed from 0.83 to 1.02 seconds. Follow- 

 ing this there is indicated the usual tendency to a permanent shortened 

 duration of the pulse cycle. Gar's curve shows an especially marked 

 change at the initial transition, and the same is seen again at the final 

 transition, where it changed from 0.91 to 1.36 seconds in six cycles. 

 There is here seen also the rebound, reaching 1.13 seconds for the 

 twentieth cycle after the walking ceased. 



The curve shown for Mon (figure 99) is an exception to the others 

 in that no marked depressions appear, the pulse cycles tending to 

 shorten continuously during the first whole minute of walking. A 

 shght depression in the curve shows a lengthening of the cycle from 

 0.86 to 0.93 second between the fourth and eighth cycles, which prob- 

 ably corresponds to the more marked depressions at this point seen 

 in other curves. The final transition pulse is also more uniform, but 

 exhibits the usual change at the twentieth cycle from the lengthening 

 duration which immediately appeared with standing. 



The pulse of Pea (figure 100) was somewhat individual in that the 

 quickened pulse immediately following the change from standing to 

 walking held its level for 10 cycles and the main reaction did not set 

 in until the eighteenth beat. The duration then suddenly changed 

 from 0.87 to 1.19 seconds, which is slower than that of the preliminary 

 standing cycles. The cycle remained at about this duration for the 



