. Carnegie Institution of Washington publication. PHYSIOLOGICAL CHANGES IN TRANSITION. 267 to 7 minutes, but here again the records were not continued a sufficient length of time to determine whether the pulse-rate returned to the normal value or remained at a higher rate for some hours, as was observed by Benedict and Curve A in figure 31 shows a rise from an average rate of 64 to a rate of 146 when the subject began to walk on a 30 per cent grade. When he stopped walking at the end of the first period, there was an immediate drop of 53 beats. When the walking began again, the puls
. Carnegie Institution of Washington publication. PHYSIOLOGICAL CHANGES IN TRANSITION. 267 to 7 minutes, but here again the records were not continued a sufficient length of time to determine whether the pulse-rate returned to the normal value or remained at a higher rate for some hours, as was observed by Benedict and Curve A in figure 31 shows a rise from an average rate of 64 to a rate of 146 when the subject began to walk on a 30 per cent grade. When he stopped walking at the end of the first period, there was an immediate drop of 53 beats. When the walking began again, the pulse-rate rose to 170, with a greater fall at the end of the second period of walking and a still greater rise for the third period of walking. Curve B in figure 31 shows essentially the same characteristics as those of curve A in the same figure. 140 TZO 100 80 60 A (S ^ -^ Y , j / 1 351 45r ^^ I "'"* \. i 200 180 160 140 120 100 80 « 200 180 160 140 120 100 CO 8° 60 i 00 C ^ f5 E . *' »3, L 4 ' / I i 40 10^° ^ w iiuoaj *J ^ 200 180 160 140 120 100 80 60 V B J~ ?-• / S ^ L H Jmetora b ^ X >8°™. "° 4O ID ^ *° 1 '. 10 FIG. 32.—Typical pulse curves of E. D. B., with subject standing, and walking on an incline. (Values per minute.) 1, subject sitting; 2, standing; 3, walking on an incline. Black points, records during experimental periods; open circles, records between periods. Curve A, Feb. 15; B, Feb. 18; C, Feb. 17; D, Feb. 19; E, Feb. 22; F, Feb. 21, 1916. In figure 32 curves A and B represent pulse records obtained when the walking was continuous and illustrate the gradual rise in the pulse- rate due to the cumulative effect of the exercise. As no records of the pulse-rate were made in the intervals between the walking periods in the other experiments in figure 32, there is accordingly no picture of the fall which took place while the subject was standing in these intervals. (See C, D, E, and F.) The curves in other respects are similar to those pr
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