Strength Training Effects on Plantar Flexor Function and Tendon Health After Achilles Tendon Rupture in Men Ages 18 to 64

What this Trial Is About

Achilles tendon rupture is a common injury that can lead to long-lasting functional, neuromuscular, and tendon issues, such as reduced muscle force capacity and changes in muscle and tendon structure. This trial aims to compare how different intensities of strength training affect recovery of plantar flexors function, neuromuscular activity, and tendon properties in men who suffered this injury between one and five years ago. Healthy men without the injury will serve as a control group. Participants who experienced an Achilles tendon rupture will undergo a 12-week progressive strength training program for their calf muscles, held twice weekly with 25 gym sessions in total. They will be randomly assigned to either a low-intensity group using 55% of their one-repetition maximum load or a moderate-intensity group using 70%. Exercises include standing and seated unilateral plantar flexion on specialized machines. The control group of healthy men will have no training. During the study, participants will be assessed before and after the 12-week training using various tests such as functional performance, ultrasound imaging, isokinetic dynamometry, electromyography, and electrical stimulation. Researchers will measure changes in Achilles tendon morphology, mechanics, and material properties, muscle architecture and quality, ankle function, muscle force production, voluntary activation, and neuromuscular recruitment. Data will be analyzed statistically to compare groups and time points, monitoring outcomes up to one week after the training ends.

Effects of Strength Training on the Plantar Flexors' Properties After Achilles Tendon Rupture