80 A BIOMETRIC STUDY OF BASAL METABOLISM IN MAN. 



4. PULSE-RATE AND TOTAL HEAT-PRODUCTION. 



Table 21 gives the coefficients for pulse-rate and total heat-produc- 

 tion and for pulse-rate and total heat-production per kilogram of 

 body- weight. 



The correlations for pulse-rate and total heat are all positive in 

 sign but numerically low and extremely variable in magnitude. In the 

 latter regard they are in full agreement with the constants for pulse- 

 rate and gaseous exchange, as is to be expected from the method of 

 computing the heat-production from gaseous exchange. 



TABLE 21. Comparison of correlations between pulse-rate and gross heat-production and 

 between pulse-rate and heat-production per kilogram of body-weight. 



Before deciding that physiologically there is a very slight correla- 

 tion between pulse-rate and gaseous exchange or pulse-rate and total 

 heat-production one must remember that the measures of gas volume 

 are to a considerable degree dependent upon the absolute size of the 

 individuals upon which they are based. To determine more exactly 

 the true physiological interdependence between pulse-rate and total 

 heat-production, some correction for the absolute size of the organism 

 must, therefore, be made. This may be done in either of two ways : 



First, one may correct for size directly in the case of each individual 

 by reducing gross heat-production to calories per kilogram or calories 

 per square meter of body-surface. 



Second, one may work with final constants merely by determining 

 the partial correlation between pulse-rate and total heat-production 

 for constant stature, constant body-weight, or constant stature and 

 body-weight. 



With the exception of the small series of athletes and the group 

 other than the Gephart and Du Bois selection among the men and the 

 supplementary series of women, all of the values are raised when the 

 influence of extreme variation in body-size is to some extent elimin- 



