PHYSIOLOGICAL EFFECTS OF GRADE WALKING. 



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meters per minute (2.5 to 2 miles an hour) on a 30 to 40 per cent grade, 

 and performing approximately 1,200 to 1,600 kg. m. of work. With 

 a grade of 30 per cent and a speed of 68 meters per minute, the body- 

 temperature increased regularly during the 32 minutes of continuous 

 walking, reaching a maximum of 38.23 C., with a total rise of 1.63 C. 

 (See curve A.) The fall in temperature when the subject stopped 



Fia. 34. Typical body-temperature 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 experi- 

 mental periods; open circles, records between periods. Curve A, Feb. 2; B, Feb. 25; C, 

 Mar. 8, 1916. 



walking and stood, at 10 h 55 m a. m., was not so rapid as that shown by 

 the curve D when a higher body-temperature was reached, or when 

 the subject sat after walking, as shown by curve C in figure 34. A 

 more rapid fall began at ll h 40 m a. m., when the subject sat down, 

 which again was retarded during the standing period of 20 minutes 

 about 12 o'clock. At 1 p. m., after 2 hours and 5 minutes of inter- 

 mittent standing and sitting, the temperature had not reached the 

 initial level. 



