548 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



that these results show that the men of both Squads A and B — Squad 

 A at a maintenance period and Squad B while undergoing a rigid diet 

 reduction — walked with a saving in total energy expended and with 

 a somewhat greater efficiency per unit of work than did Squad B on a 

 normal diet. 



NUMBER AND LENGTH OF STEPS IN WALKING EXPERIMENTS. 



In connection with the walking experiments the uniformity in the 

 number of steps and in length of step while walking a given distance 

 was studied by means of photographic records. (See p. 129). These 

 data are in table 144. From the distance walked, length of period, 

 and the number of steps as computed from the photographic records, 

 the average number of steps taken per minute, length of step, and 

 total number of steps per 100 meters are found. It is evident that if 

 the mill is maintained at a definite speed, these last three values are 

 functions of each other, and if the man shortens his step he must take 

 more of them to cover a given distance. 



By comparing the results of Squad B on January 6 and 28, it is seen 

 that Fis took longer strides and fewer steps per 100 meters on January 

 28 than on January 6, and that Sne had the same length of stride and 

 number of steps per 100 meters on the two days. The record for How 

 for January 28 is not available for comparison. 



With these exceptions, the other members of the squad all shortened 

 their stride and increased the number of steps per 100 meters on 

 January 28. That this change in the length of stride is characteristic 

 throughout the whole period, and that there is no marked alteration 

 as the walking progressed, is shown by the figures given in the same 

 table giving the length per step at the sixth, twelfth, and twenty- 

 fourth minutes, as calculated from the photographic records and 

 the distance traveled during that portion of the experiment when the 

 record was made. 



On January 6 Har showed an apparent change in stride following 

 the sixth minute and on January 28 Sch apparently shortened his 

 stride. Aside from these variations, there appear no marked changes 

 except that the one-minute observations of January 6 indicate more 

 irregularities than the other periods; this is probably due to the 

 regulating of the mill, which, as previously stated, generally took a 

 minute before adjustment to the desired speed of 70 meters per minute 

 was secured. For this reason the figures in this column have not 

 been included in the averages for this day. 



As normal data for Squad A were not obtained, the data for this 

 squad observed with low diet can only be compared as an average of 

 11 men with the average of the 11 men of Squad B. Such a com- 

 parison is of less significance than the comparison of the individual 

 changes for each man, for one or two men with long legs might alter 



