is 
o 
RODDIE, I. C. 
O2 
SAT. % 
■ SUPERFICIAL 
• DEEP y^*^^ 
/y*^ 
100 
JjT 
80 
60 
Y %/ 
=^?-Hy^*^-^^ 
40 
- 
O 20 40 60 
MINUTES 
Figure 1. The effect of body heating on the oxygen saturation 
of deep and superficial venous blood and forearm blood flow. TTie 
black rectangle represents the period of body heating. Left forearm 
blood flow, o ; oxygen saturation of superficial venous blood (right 
forearm) • ; oxygen saturation of deep venous blood (rig^t forearm) 
ai . (After Roddie, Shepherd, and Whelan, J. Physiol. (Lond.). 134: 
444, 1956). 
SSI''"" 
J \ 
I 
t=^ 
«4 J 
Figure 2. Changes in forearm blood flow with change in boc^y 
posture. The open rectangles representthe periods duringwhich the 
subjects' legs were raised from the horizontal to the vertical 
position. 
116 
