| Keywords |
High-concentration oxygen ; All-out ; Heart rate ; Lactate level ; Recovery |
| Abstract |
This study examined the effect of high concentration oxygen breathing after graded exercise intensity application on recovery heart rate and blood lactate levels. Five healthy men (19±0.0 yrs, 174.1±8.2 cm, 66.7±3.8 kg, 22.0±1.2 kg/m2) were tested four occasions while running on a treadmill using Bruce protocol either up to 75% maximal effort (75) or all-out (100) by breathing either normal air (NO2) or 99.5% O2 (HO2) during recovery period after the exercise bouts. Heart rate (HR) and blood lactate were measured five times during the testing such as resting state and 5, 10, 15, and 20 min of recovery period. At 5th min of recovery period, HR was significantly lower in 100-HO2 (102.6±12.7 bpm) than 100-NO2 (111.4±14.9 bpm) (p<.05). During 10th and 15th min of recovery, lactate was significantly lower in 100-HO2 (9.9±2.2 and 8.4±2.2 mmol/L) than 100-NO2 (12.7±2.7 and 9.6±3.3 mmol/L) (p<.05). No differences were found between 75-HO2 and 75-NO2 in either measured variables. Therefore, the high concentration oxygen breathing after graded intensity exercise may be beneficial in recovery metabolic process. However, this effect may vary depending on exercise intensity accompanying oxygen deficit. |