BLOOD PRESSURE. 379 



With the diastolic pressure for Squad A the immediate effect of work 

 was usually to lower the pressure measurably, although Pec shows a 

 rise of 16 mm. Practically all the other men show either a very slight 

 rise or a pronounced fall. A lowering of 9 or more millimeters may be 

 noted in the case of Gar, Gul, Pea, and Tom, the fall with Pea being 

 19 mm. The average diastolic pressures before work and the first 

 quarter minute after work were 72 and 69 mm., respectively. The sub- 

 sequent course of the diastolic blood pressure usually tended towards a 

 slight rise, being in 9 cases higher at the end of 2 minutes than at the 

 end of the first quarter minute. With Gar it rose from 62 to 76 mm. 

 in 2.5 minutes and with Tom from 66 to 72 mm. With most subjects 

 there was a tendency for the diastolic blood pressure to fall when the 

 sitting position was assumed. At the end of 9 minutes after work, 

 with the subject in the sitting position, the diastolic pressure was 

 usually not far from that for the standing position prior to work, 

 although some rather striking exceptions to this may be noted in the 

 cases of Gul, Pea, and Pec. Especially worthy of note are the low 

 values of 58, 56, and 54 mm. noted with Pea. These values are abso- 

 lutely lower than any diastolic blood pressures heretofore noted with 

 this subject, the lowest diastolic value shown in table 76 with this 

 man being 60. 



The immediate effect of work on the pulse pressure was in all but 

 three instances a noticeable rise to an average pulse pressure of 35 

 mm. as compared with 29 mm. before work. The greatest rise was 

 found with Pea, the pulse pressure changing from 18 to 40 mm., i. e., an 

 increment of 22 mm. Kon, Pec, and Vea show falls of 6, 7, and 4 

 mm., respectively. The subsequent records indicate a definite ten- 

 dency for the pulse pressure to fall as time passed. No great differ- 

 ence is noted when the subject changed to the sitting position. At 

 the end of 9 minutes the pulse pressure is usually not far from that 

 prior to work, except in the values found for Kon, Gul, and Pea. 



MODERATE MUSCULAR WORK AND BLOOD PRESSURE. SQUAD B. 



Observations on systolic, diastolic, and pulse pressures were made 

 with Squad B before and immediately after walking on the morning 

 of January 28, 1918. The data secured are recorded in table 79. A com- 

 parison of the values for the systolic pressure before walking with those 

 obtained with the same subjects the evening before, (see table 77) 

 is of interest. For the most part there is no great difference be- 

 tween the two series although certain of the men, particularly Kim 

 and Sch, show very considerable increases over the evening record. 

 The average for the systolic pressure for the evening of January 27 

 was 94 mm. and for the morning of January 28, 101 mm. 



The effect of walking was determined, as before, by observing the 

 blood pressures in the first 15 seconds after the cessation of walking. 



