Abstract: Objective: To compare the effect CWI (cold water immersion) and WBC (whole body cryotherapy) after high-volume training on muscle oxygen content, subjective and objective sensation of fatigue, as well as performance for youth female football player. Methods: The cross-over study was used. After high- volume training of football, 12 Youth female player went CWI, WBC and control trial every other week. To observe changes of muscle oxygen saturation(SmO₂), muscle soreness, Rating of Perceived Exertion ( RPE), Countermovment Jump (CMJ) , Maximal Voluntary Isometric Contraction ( MVIC), 30 m sprint at before exercise, after exercise, after treatment, and one day after treatment. Repeated measures ANOVA analysis was used. Results:(1) Time and treatment had significant interactive effect on SmO₂(P<0.05). SmO₂ in CWI group was significant lower than WBC group and CON group(P<0.05); (2) Time and treatment had significant interactive effect on RPE(P<0.05). After treatment, RPE was lower in CON and WBC group than CWI group than CWI group; time and treatment had no interactive effect on muscle soreness(P>0.05); time and treatment had significant interactive effect on muscle pain threshold(P<0.05); (3) Time and treatment had significant interactive effect on CMJ(P<0.05). After treatment , only CWI group decreased significantly(P<0.05); time and treatment had no interactive effect on MVIC(P>0.05). Time and treatment had significant interactive effect on 30 m sprint. After treatment, sprint time in CWI group was higher than that in the other two groups(P<0.05). One day after treatment, all three groups didn't reach baseline level(P>0.05). Conclusion: CWI makes SmO₂ and explosive ability (CMJ and 30 m sprint) decrease temporarily, but has positive effect on recovery of subjective fatigue. WBC leads to less change of lower leg function and sport performance.

Key words: CWI, WBC, SmO₂, RPE, sports performance