Running a Marathon-Its Influence on Achilles Tendon Structure

Area of Science:

• Sports Medicine
• Biomechanics
• Musculoskeletal Imaging

Background:

• The impact of high cumulative load from repetitive activities like marathon running on Achilles tendon structure remains unclear.
• Understanding these effects is vital for clinicians, coaches, and athletes to manage training and recovery.

Purpose of the Study:

• To investigate the short-term structural changes in the Achilles tendon following marathon completion.

Main Methods:

• A prospective case series involving ten male non-elite marathon runners.
• Ultrasound tissue characterization (UTC) was used to assess Achilles tendon organization (echo types I-IV) before and 7 days after the marathon.
• Changes in echo type distribution were analyzed to quantify structural alterations.

Main Results:

• Significant changes in Achilles tendon structure were observed at both the insertion and midportion 7 days post-marathon.
• An increase in echo type II and decreases in echo types III and IV were noted at both tendon sites.
• A decrease in the most stable echo type I was observed at the Achilles tendon insertion.

Conclusions:

• Marathon running induces short-term structural changes in the Achilles tendon, detectable up to 7 days after the event.
• These alterations may result from the combined stress of the marathon and subsequent activity, highlighting the need for sufficient recovery.
• Adequate rest periods are essential post-marathon to mitigate the risk of Achilles tendon overuse injuries.