174 METABOLISM DURING WALKING. 



The relationship between the body-temperature for standing and 

 walking is also shown in figure 14 by 6 typical curves for different speeds 

 of walking. Each temperature reading is indicated, those within the 

 experimental periods being represented by black points and those in 

 the intervals between the experimental periods by small circles. 

 The changes to standing, walking, or sitting are shown by arrows, with 

 accompanying index numbers, and the rate of walking is given in 

 each instance. Curve A, for comparison, records sitting and stand- 

 ing values only. 



Nearly every individual period in each curve shows an increase in the 

 temperature during the period with both standing and walking. There 

 is usually a disturbance in the temperature at the points indicated by 

 arrows when the subject changed his position, which is possibly due to a 

 change in position of the thermometer. The curve of April 4 (B) is in- 

 serted especially to show the marked variation in temperature which was 

 experienced when the subject stood (2) at 10 h 30 m a. m. before the third 

 period and again when he began walking (3) at ll h 6 m a. m. before the 

 fourth period. It is possible that the depression in temperature before 

 the fourth period may have been due to removal of the blanket, though 

 no note regarding it appears in the records. In both these instances 

 the temperature fell for at least 10 minutes, after which it became 

 settled and subsequently rose as usual. This displacement of the 

 temperature level results in an average walking temperature which is 

 less than the average standing temperature, but it is seen that the 

 increase during the walking-periods was of about the same order as on 

 the other days. 



The increase in temperature with the transition from standing to 

 walking does not manifest itself immediately for the moderate speeds 

 (see curves B, C, and D for April 4, April 1, and March 20), there 

 being apparently a lag of from 6 to 10 minutes before the rise appears. 

 This lag is, however, somewhat shortened in curves E and F (Apri 1 12 

 and 13), with speeds of 88 and 97 meters. These latter curves show a 

 much more rapid rise in temperature in each period, with a tendency 

 to reach a maximum, particularly in curve E. The fact that the 

 blanket was removed at the time that the walking began is undoubtedly 

 a factor here in preventing as quick a response as there would have been 

 had the subject stood and walked under exactly the same conditions of 

 clothing. The increase in temperature is almost always larger for the 

 first walking-periods than for the subsequent periods, showing that 

 the difference between the rate of heat-production and radiation was 

 becoming constantly less and that a more or less constant temperature 

 would have been attained had the period been sufficiently prolonged. 



The effect of speed of walking upon the temperature curves is not 

 marked, except at the higher rates. The general character of the 

 curves in figure 14 and others not presented indicate but little difference 



