The purpose of this study is to determine the effectiveness of eccentric exercise combined with vibration or cryotherapy in Achilles tendon pathology.

The investigators hypothesis is that the combined eccentric exercise is better than the results presented by the exclusive eccentric exercise.

This intervention differs from the classic studies in that we maintain the intensity throughout the treatment.

Inclusion Criteria:

• Sports people
• Positive initial ultrasound diagnosis
• Presence of degenerative changes at achilles mid portion
• Chronic Achilles tendon pain, (3/10 VAS)
• Pain when walking or running of Achilles tendon, (3/10 VAS)
• Pain in load in plantar flexion of Achilles tendon, 3/10 VAS)
• Pain in palpation of Achilles, (3/10 VAS)
• Morning Stiffness

Inclusion Criteria Healthy pople:

• Sports people
• Negative initial ultrasound diagnosis
• No syntomp of achilles tendinophaty

Exclusion Criteria:

• Receive physical, orthotic or physiotherapeutic treatment
• Asociated low back pain, ankle/knee/hip injury that may affect the study
• Previous injury or surgery of Achilles tendon.
• Pathologies that may limit the joint of ankle
• Pregnancy
• Obesity
• Patients with diabetes and/or other endocrine or metabolic pathologies or neurologic pathologies
• Patients diagnosed with cardiovascular disease
• Subjets diagnosed with familiar hypercholesterolemia and/or presence of xanthomas or with hyperuricemia
• Patients who have received renal transplantation
• Subjects who have suffered retinal detachment
• Subjects who have received oral contraceptives, statins, corticoids or hormone replacement therapy in the last six months
• Subjects who have received treatment wiht fluoroquinolones in the last two years
• Subjects who have received treatment with AINE's in the last four weeks