The objective of this study was to evaluate the efficacy of cryoultrasound therapy versus diathermy in combination with high-intensity laser therapy for pain relief in male professional soccer players with muscle injuries. The main questions it intends to answer are:

• Is this combination of treatments effective in these patients in terms of pain relief?

Participants will receive a rehabilitation treatment consisting of cryo-ultrasound therapy and high intensity laser. Researchers will compare the group of participants, called the treatment group, with a control group to see if:

• Is the combined treatment of cryoultrasound therapy and high intensity laser more effective in these patients than the combination of diathermy and high intensity laser?

Inclusion Criteria:

• age 18-21 years;
• professional footballer in a competitive club;
• presence of a grade III A muscle lesion, according to the Mueller-Wohlfart classification, confirmed by ultrasound examination and occurring during sports activity at least 5 days before inclusion in the present study;
• no previous muscle injuries in the last 6 months;
• signature of the written informed consent for participating in the study.

Exclusion Criteria:

• previous muscle injuries or bone fractures of the lower limbs in the last 6 months;
• knee instability due to previous rupture of knee ligaments;
• active neoplastic or infectious diseases;
• congenital anomalies of the lower limbs.