European Journal of Applied Physiology

, Volume 110, Issue 5, pp 1037–1046

Changes in tendon stiffness and running economy in highly trained distance runners

  • Jared R. Fletcher
  • Shane P. Esau
  • Brian R. MacIntosh
Original Article

DOI: 10.1007/s00421-010-1582-8

Cite this article as:
Fletcher, J.R., Esau, S.P. & MacIntosh, B.R. Eur J Appl Physiol (2010) 110: 1037. doi:10.1007/s00421-010-1582-8

Abstract

The purpose of this study was to determine if changes in triceps-surae tendon stiffness (TST K) could affect running economy (RE) in highly trained distance runners. The intent was to induce increased TST K in a subgroup of runners by an added isometric training program. If TST K is a primary determinant of RE, then the energy cost of running (EC) should decrease in the trained subjects. EC was measured via open-circuit spirometry in 12 highly trained male distance runners, and TST K was measured using ultrasonography and dynamometry. Runners were randomly assigned to either a training or control group. The training group performed 4 × 20 s isometric contractions at 80% of maximum voluntary plantarflexion moment three times per week for 8 weeks. All subjects (mean \( \dot{V}{\text{O}}_{ 2} { \max } \) = 67.4 ± 4.6 ml kg−1 min−1) continued their usual training for running. TST K was measured every 2 weeks. EC was measured in both training and control groups before and after the 8 weeks at three submaximal velocities, corresponding to 75, 85 and 95% of the speed at lactate threshold (sLT). Isometric training did neither result in a mean increase in TST K (0.9 ± 25.8%) nor a mean improvement in RE (0.1 ± 3.6%); however, there was a significant relationship (r2 = 0.43, p = 0.02) between the change in TST K and change in EC, regardless of the assigned group. It was concluded that TST K and EC are somewhat labile and change together.

Keywords

Ultrasound imagingLactate thresholdTendon complianceOxygen uptake

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Jared R. Fletcher
    • 1
  • Shane P. Esau
    • 1
  • Brian R. MacIntosh
    • 1
  1. 1.Human Performance Laboratory, Faculty of KinesiologyUniversity of CalgaryCalgaryCanada