comparison of the effects of massage and cryotherapy on the knee extensor muscles fatigue and isokinetic parameters in soccer players

background: fatigue can cause a significant effect on the mechanics of complex motor skills and reduce physical and mental efficiency. one of the common ways to reduce fatigue is passive recovering or using massage and cryotherapy after exercise. the present study aimed to compare the effects of massage and cryotherapy on muscles fatigue and isokinetic parameters. methods: this study was conducted on54 healthy athletes aged 20-30 years who were randomly divided into three groups: cooling (ice therapy), massage, and control (resting). each of the volunteers was evaluated in two sessions. the first session was to familiarize the participants with isokinetic contraction. the second session started with a brief warm up subsequently, using biodex isokinetic system average peak torque (aptq), average power (ap), and total work (tw) were measured. then, the fatigue protocol was applied. afterwards, interventions were performed for 15 minutes. after the intervention, isokinetic parameters were evaluated again. also, perceived fatigue and fatigue index (fi) were recorded before and after the intervention. results: aptq, ap, and tw significantlyincreased in massage and cryotherapy groupsafter the intervention, while perceived fatigue and fi decreased significantly in both conditions (p<0.05). in the control group, however, no significant differences were observed in aptq, ap, and tw before and after the intervention (p>0.05), but perceived fatigue and fi decreased significantly (p<0.05). moreover, isokinetic variables (aptq, ap, and tw) were higher in the massage group compared to cryotherapy and control groups (p<0.05), but such a difference was not observed between the massage and cryotherapy groups (p>0.05). conclusion: massage and cryotherapy could increase isokinetic parameters and decrease fi and perceived fatigue. therefore, massage and cryotherapy have been more effective than rest as a strategy to return to normal state and no significant difference was observed between these two groups.