PHYSICAL AND PHYSIOLOGICAL MEASUREMENTS. 105 



between age and metabolism, but because in adults there is little rela- 

 tionship between age and stature. 



9. RECAPITULATION AND DISCUSSION. 



1. Our series of data show practically no relationship between basal 

 or minimum pulse-rate and body-weight in adults. In new-born infants 

 there may be a slight positive correlation, more rapid pulse being asso- 

 ciated with greater body-weight, but further investigation is necessary 

 before final conclusions can be drawn. 



2. As far as our data show, there is practically no relationship 

 between stature and pulse-rate in man. 4 



3. There is a low but significant positive correlation between 

 minimum pulse-rate and gaseous exchange in men, larger gaseous 

 exchange being associated with more rapid pulse-rate. The series of 

 women available show as yet inexplicable inconsistencies in these 

 relationships. The correlation between pulse-rate and oxygen con- 

 sumption is more intimate than that between pulse-rate and carbon- 

 dioxide excretion. Physiologists have long been familiar with the 

 correlation between pulse-rate and metabolism in the same individual, 

 that is with the intra-individual correlation between the rate of the 

 heart-beat and the amount of the katabolism. Here, however, we are 

 dealing with the problem of the relationship between the minimum 

 pulse-rates of a series of individuals and their basal metabolism con- 

 stants that is, with inter-individual correlation. 



4. The inter-individual correlations between pulse-rate and gross 

 heat-production are positive throughout, but low and variable in mag- 

 nitude. When correction for body-size is made by expressing heat 

 production in calories per kilogram of body-weight or in calories per 

 square meter of body-surface, the magnitude of the correlations is 

 materially raised. This indicates that the relationship is one of real 

 physiological significance. The most intimate correlations are obtained 

 when correction for body-size is made by expressing heat-production 

 in calories per square meter of body-surface. This result has an obvious 

 bearing on the so-called body-surface law, to be discussed in ChapterVI. 



5. There is a high positive correlation between body-weight and 

 gaseous exchange. The correlations are of the order r=0.75 for men 

 and r = 0.60 for women. Expressed in actual gaseous exchange, this 

 degree of correlation means that in men oxygen consumption increases 

 about 2.27 and carbon-dioxide excretion increases about 1.89 c.c. per 

 minute for an increase of 1 kilogram of body-weight. For women the 

 values are about 1.17 c.c. 2 and 1.02 c.c. C0 2 per kilogram of weight. 

 These are the values for the grand total series. Those for the several 

 sub-series differ considerably among themselves. 



4 Conclusions 1 and 2 must be understood to be limited to our own data for minimum or basal 

 pulse-rates. They may not be strictly valid for subjects under other conditions. This question 

 may be treated by one of us later. 



