Survey On Relation Between Tissue Oxygenation Content And Incremental Exercises Before And After Four Weeks Of Hypoxic Training

Objective:Muscle oxygen saturation (M-rS02), cerebral oxygen saturation (C-rSO2), oxygen uptake (V02).heart rate (HR) were measured twice respectively before and after4weeks hypoxia exercise training under simulated hypoxic environment at an altitude of2500meters. By analyzing the relationship between these data mentioned above and exercise intensity, I hereby discussed about the feasibility of setting tissue oxygen saturation as a supporting indicator for exercise intensity in hypoxia exercise training.Methods:Search objects are8healthy male athletes from Sanda Team of Beijing Sport University. They undertook4weeks training under simulated hypoxic environment at an altitude of2500meters, three times a week and100hypoxia minutes for each training. Training content is a combination of cycle ergo-meter and running endurance sports. For each session, physical fitness exercises last60minutes, special technology practice30minutes and10minutes rest and during break time, they were also under hypoxia. Measurements were taken on the first day in acute hypoxia and at the end of the fourth week after they undertook the hypoxic training. When they were exhausted by cycling with increasing load power, indicators of M-rS02, C-rS02, gas exchange metabolism and HR were recorded in a continuous fashion.Results:(1) In the process of linear incremental load movement, the changing rhythm of M-rS02in acute hypoxia is the same as that after4weeks training. The changing rhythm of HbO2is on linearly decrease, HHb is on linearly increase along with more exercise intensity, THb is on increase progressively along with more exercise intensity. All indicators of M-rS02after4weeks training are higher than that in acute hypoxia with the same load.(2)In acute hypoxia, with exercise load increasing, two changing trends of HbO2, HHb and THb are basically the same. After exercises started, HbO2began to drop and after it dropped to the lowest value, when the exercises were continued, trends gradually became stable till the exercises stopped. At the beginning, HHb and THb showed growing trend. With the changes of maximum oxygen intake intensity, it gradually became steady till the exercise came to halt. After the exercises came to cease and when in recovery phase, all indicators of M-rS02changed. Namely, HbO2increased rapidly, HHb decreased rapidly; THb also was on obvious growth. When they were recovered to calm state, all indicators were higher than those in calm state before start of exercise.Conclusion:(1) Percentage of V02max and HR max enjoy substantial increase after4weeks hypoxic training. Indicators of muscle oxygen and cerebral oxygen underwent increase or decrease changes after4weeks hypoxic training and all indicators are better than these in acute hypoxia.(2) Ratio of△(HbO2)、△(HHb) and△(THb) in M-rS02and C-rS02to V02max shows sound relation in the process of4weeks hypoxic training.(3)Parameters derived from measuring C-rS02in linearly incremental loading exercise are able to effectively reflect tissue oxygen saturation status and individual’s ability of adapting to hypoxic. Hence, these indicators are pragmatically valuable to make optimum hypoxic training for effectively increasing exercise ability and can serve as evidence for assessing exercise intensity.