408 



PHYSIOLOGICAL EEGULATIONS 



measured during and after exercise in man. Each could enter a 

 series of interrelations of the sort indicated. To insure a basis 

 for comparisons it is desirable, of course, to secure all the measure- 

 ments during one bout of exercise, or during a series of repro- 

 ducible bouts. In the end, economy of representation of the data 

 could be secured by constructing alignment charts : one chart for 

 loads, one for rates of change, one for velocity quotients, or one 

 for all combined. The components considered would include water, 

 heat, total substance, potential energy, external work, glucose, 

 oxygen, carbon dioxide, lactate, chloride, nitrogen, and as many 



^24 

 *2.0 



o 

 O 

 I 



"§^1.2 

 o 



_J 



t-oe 



(U 



X 



^04 



X 



/-I2 

 /-I 3 hr 



S"tart exerci 



stop exercise 1.0 hr^ 



o.aJ 



Ob-\ 

 I 



-0.4 



04- 



01 hr-.^0.2 



I -0.2 

 vLJ-Olh 



■^20 +40 +60 ^80 +100 +120 

 Heai-t Frec[uency Load — percent 



Fig. 186. Heat load (Cal.Ag-) in relation to heart frequency load (% of initial 

 frequency) during and after exercise. Man, subject M.N., 72 kg., working on stationary 

 bicycle. E, 86,000 kg.m./hour external work for 1.50 hours; S, 58,000 kg.m./hour for 

 1.00 hour. Heart frequency and rectal temperature were originally read every minute. 

 Heat load is computed as increment of rectal temperature x 0.83. Data of Christensen 

 ('31, pp. 463 and 464). 



others as could be handled. The limitations to the investigation 

 would not be in securing the data but in grasping the interrela- 

 tions present, for the number of correlations even when taken only 

 two at a time, increases as [(n-l)^+ (n-l)]/2, or (n^-n)/2. 

 The reward of the investigation would be a picture of how the 

 organism coordinates a number of simultaneous processes in a 

 combination that would snarl up many a man-managed factory 

 indefinitely. 



