CONTROL OF PERIPHERAL CIRCULATION 
DR. RODDIE: Yes, but, as you know, some places when you apply 
it to the skin, you seem to get a greater sensitivity than in other 
places on the skin. And this does make it difficult to compare the 
absolute levels after a period of heating. 
DR. HENSEL: Did you measure the zero value? 
DR. RODDIE: No. You cannot really do that on the chest. 
DR. HENSEL; Yes, you can do that. A balloon works very well. 
You get a zero flow and then you can check it quantitatively. I think 
you should try that. 
DR. RODDIE: Well, I think so, this definitely needs a better 
method of measuring skin blood flow. 
DR. HENSEL: May I add a second question? I had some difficul- 
ties in understanding your conclusion concerning the inhibition of 
vasoconstrictor tone during raising the legs. You have drawn this 
conclusion by the failure of atropine. 
DR. RODDIE: Yes. We have. 
DR. HENSEL: And afterwards, you showed that there might be 
some evidence for a non-cholinergic dilator mechanism. So, I would 
think your first conclusion is not correct. 
DR. RODDIE: When the legs were raised, a vasodilation oc- 
curred in the muscle. 
DR. HENSEL: Yes. It did. 
DR. RODDIE: No matter how high the legs were raised, the 
blood flow on the normal side did not rise above that on the opposite 
nerve-blocked side. 
DR. HENSEL: And you did not get any higher level as found in 
nerve blocking? 
DR. RODDIE: No. We did not. 
137 
