INDIVIDUALS AND MEASUREMENTS CONSIDERED. 



67 



For original 

 Nutrition Laboratory series. 



For 89 men 60.92 0.47 



For 68 women . . . 69. 12 0.67 



For all men N==121 



For all women A T = 90 



+8.20 0.82 



For all 

 available data. 



61.260.41 

 68.67*0.59 



+7.41 0.72 



In both comparisons the women show from 7 to 8 beats per minute 

 more than the men, and these differences are about 10 times as large 

 as the probable errors of their determination. The sexual differentiation 

 thus indicated has been noted by other writers. Thus Leonard Hill, 78 

 in an article on "The mechanism of the circulation of the blood" says : 



"The pulse frequency is greater in women than in men, but this difference 

 almost disappears if men and women of equal stature are compared." 



Langendorff, in his article on the circulation of the blood, 79 states 

 that the pulse of adult men resting in bed is about 60, while standing 

 it is 70 to 75 per minute, and that in women it is somewhat higher. 

 Professor Robert Tigerstedt 80 states that in all ages, from 2 years on, 

 the pulse-rate of the woman is higher than that of the man. The 

 smaller size of the woman plays a role, but even if individuals of the 

 same stature are compared the difference is persistent though smaller. 



We now turn to the constants for total heat-production. 



TABLE 16. Statistical constants for total heat-production per 24 hours in adults. 



The means, standard deviations and coefficients of variation for 

 total heat-production in calories per 24 hours are given in table 16. 

 The entries in this table, representing as they do the constants for the 

 most extensive series of data available on basal metabolism in men 

 and women, have a great deal of interest. The first column shows 



78 Hill, Schafer's Text-Book of Physiology, London and New York, 1900, 2, p. 101. 



79 Langendorff, Zuntz and Loewy's Lehrbuch der Physiologic des Menschen, Leipzig, 1913, 



2, Aufl., p. 373. 



80 Tigerstedt, Lehrbuch der Physiologic des Menschen, Leipzig, 1913, 7, Aufl., 1, p. 282. 



