[The distribution of cardiac output in waking rats with a decrease in body temperature to 2.3 degrees C through cooling or hypoxia]. 
Heart output distribution (HO) was characterised by incorporation of 15-micron 131-I [correction of 15- 131J]-albumin microspheres after cooling and altitude hypoxia in alert rats.  There was no significant change in the HO distribution in experimental rats except a 1.5-fold increase of the skin HO portion and a 1.5-fold decrease of the bone marrow HO portion in hypothermic rats.  The latter developed an increase in the blood flow in skeletal muscles and different skin parts as compared with the hypoxic rats.