PULSE-RATE. 445 



after 1 minute and 10 minutes of standing, with as many intermediate 

 records as opportunity permitted. In each instance there was an 

 increase in pulse ranging from 3 beats or 8 per cent for Liv to 21 beats 

 or 41 per cent for Sne, with an average pulse-rate of 55 for the 9 

 subjects, an increase of 9 beats or 20 per cent. The average pulse-rate 

 with the subject standing in the chamber is slightly lower than the 

 pulse taken outside the chamber, but the changes are both positive 

 and negative. These pulse-rates were counted at different intervals 

 of standing and there is not the uniformity in this respect that there 

 was with the other pulse-rates taken for standing. The records as a 

 whole may be said to show that the subjects had adapted themselves 

 to the conditions and that there was nothing abnormal about any of 

 the pulse-rates. The records for those counted at the end of 1 minute 

 of walking all show an increase above the standing pulse inside the 

 chamber, varying from 8 beats or 13 per cent for Kim to 19 beats or 

 41 per cent for Wil. The average pulse-rate for the group had increased 

 17 beats to a rate of 69 or an increase of 33 per cent. The same fall 

 in pulse-rate between the end of 1 minute and the end of 6 minutes is 

 noted here as was observed on January 6, Wil being the only exception 

 to this general behavior. 



The fact that there was a drop in the pulse from the first minute is 

 evident in a study of the rates shown for the intervening minutes. It 

 is seen that the heart had begun to recover from its first stimulus of 

 walking at the end of 2 minutes, for there was a drop in every instance, 

 except for Kim, whose rate remained the same but fell off by the end 

 of 3 minutes of walking, and for Wil, whose pulse first showed a drop 

 at the fifth minute. Eight of the 10 sets available for comparison 

 show that the fall following 1 minute of walking reached its lowest 

 point by the end of the third or fourth minute. By the end of 6 min- 

 utes, in 5 out of 7 cases the rate had increased from this low point, 

 though it had not reached the rate of the first minute. By the end of 

 12 minutes Wil had a pulse faster than at the end of 1 minute, while 

 the others were about at the 1-minute rate or slightly below. Unfor- 

 tunately, there are only 6 records reported for the twenty-fourth 

 minute, but if the count for either the twenty-third or twenty-fifth 

 minute is used in place of that lacking for the twenty-fourth minute, 

 it is seen that Har, Sch, and Sne still had lower pulse-rates than after 

 1 minute of walking, while Liv had the same. The other subjects had 

 pulse-rates slightly in excess of that following 1 minute of walking. 

 This relationship was likewise found on January 6 (table 98), viz., 

 that 1 minute of walking was sufficient to bring the pulse to a rate 

 that 24 minutes of walking did not materially change. 



During the 2 minutes which immediately followed walking, the 

 subjects were standing on the treadmill while the blood pressures were 

 being measured. It is obviously impossible to compare the pulse-rates 



