This study examined the effect of various concentrations of oxygen breathing on cold-induced vasodilation response in the human finger. Eight subjects (24.5¡¾2.4 yrs, 175.2¡¾4.5 §¯, 73.5¡¾8.8 §¸, 10.3¡¾4.1 §¸ body fat, 23.89¡¾1.79 §¸/§³) sat in a thermone