132 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



diastolic pressures were taken in rapid succession during the next two 

 minutes which usually resulted in readings being secured at 15 

 seconds, 1, 1|, and 2 minutes after walking ceased. The subject then 

 stepped off the treadmill, was weighed, and after sitting quietly in an 

 adjoining room the pressures were again read on the fifth and ninth 

 nainutes after walking. 



ROUTINE OF WALKING EXPERIMENT. 



The general routine of the treadmill experiments was as follows: 



On the completion of the measurements of the standing metabolism, 

 which were conducted in an adjoining room on the portable respiration 

 apparatus, the blood pressure of the subject was measured and the 

 body electrodes were applied. The subject then came to the treadmill 

 room, where these body electrodes were plugged into one branch of the 

 leads connecting with the string galvanometer. During the 5 to 10 

 minutes that the subject was sitting quietly a photographic record was 

 taken of his pulse by the string galvanometer. The subject then stood 

 and after 5 to 10 minutes his standing pulse was again recorded by the 

 string galvanometer. As soon thereafter as conditions permitted he 

 entered the chamber. On his entering, the respiration pneumograph, 

 which had been placed around his waist, was connected to the special 

 tambour, the body electrodes were plugged into the branch of the 

 galvanometer hne extending to the chamber and the step counter was 

 fastened to his ankle. 



The subject stood quietly on the treadmill with the cover of the 

 chamber lifted to its full height, which brought his head just inside the 

 base of the cover. During this time the three fans in the chamber were 

 running and the 15-cm. blower was delivering air over the side of the 

 skirt into the chamber at its full capacity of 12 cubic meters per 

 minute. 



The assistant at the observer's table recorded the readings of the 

 various counters and gave a warning of 15 seconds to the other assist- 

 an ts before the starting of the treadmill. In the experiments of January 

 6 the first walking pulse taken with the string galvanometer was at the 

 end of the first full minute. In the experiments of January 28 and 

 February 3 a photographic record was taken of the pulse at the time of 

 the transition from standing to walking, which gave the pulse for the last 

 15 seconds of standing and continuing through the first full minute of 

 walking. After 2 minutes of walking the large blower was stopped and 

 wheeled back from the edge of the chamber. At the end of 2| minutes^ 

 of walking the cover was lowered into its seal and the connecting pipe 

 in the circuit from the drier to the rear of the chamber (L in fig. 14) 

 was put in place; the chamber was now completely sealed. By this 



^ On January 6 the cover was lowered directly after the subject entered the chamber. 



