The role of the triceps-surae muscle-tendon unit on the economy of locomotion in highly-trained distance runners

The purpose of this thesis was to determine the role of the triceps-surae muscle-tendon unit (MTU) in the economy of locomotion (E) in highly-trained distance runners. E was measured in 18 highly-trained male distance runners via spirometry and the stiffness (K) of the triceps surae tendon was measured using ultrasonography. From that, 13 distance runners were randomly assigned to either a training (T) or control (C) group. The T group performed 4x20s isometric contractions at 80% of maximum plantarflexion moment (MPM) 3 times per week for 8 weeks. K was measured every 2 weeks. E was measured in both T and C before and after training. Results indicate there was no relationship between K and E at any velocity. Following training, both T and C moment increased significantly but training had no effect on K. It was concluded that the E-K relationship is difficult to predict in highly-trained distance runners; however tendon stiffness appears to be an important factor in achieving high levels of aerobic power.