| Keywords |
Various concentrations of oxygen ; CIVD ; AVAs ; Nail-bed temperature |
| Abstract |
This study examined the effect of various concentrations of oxygen breathing on cold-induced vasodilation response in the human finger. Eight subjects (24.5±2.4 yrs, 175.2±4.5 cm, 73.5±8.8 kg, 10.3±4.1 kg body fat, 23.89 ±1.79 kg/m2) sat in a thermoneutral environment (27oC, 50% RH) with immersing their finger in warm-water (42oC) for 15 min followed by cold water (3oC) for 20 min while breathing one of four oxygen concentration condition (13, 17, 21, & 100%). Rectal temperature, heart rate, nail bed temperature of middle finger, and oxygen saturation were measured every 6 seconds during 20 minutes. The peak temperature of nail bed during the cold water immersion was significantly higher when oxygen concentration was high. No differences were found among other measured variables. It appears that the high concentration of oxygen breathing may be beneficial for and a possible modifiable factor in CIVD responses. |