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Free-oscillation technique: The effect of the magnitude of the impulse applied on muscle and tendon stiffness around the ankle

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  • Aurélio Faria
  • Ronaldo Gabriel
  • Rui Brás
  • Helena Moreira
  • Márcio Soares
  • Massimiliano Ditroilo

Abstract

The importance of the muscle-tendon complex in sport and for activities of everyday living is well recognised. The free oscillation technique is frequently used to determine the musculo-articular “apparent” stiffness (obtained from vertical ground reaction force) and other parameters. However, an in-depth understanding of the muscle-tendon complex can be gained by separating the muscle (soleus) and the tendon (Achilles tendon) components and studying the “true” stiffness for each of these components (by considering the ankle joint moment arms), which can be valuable in improving our understanding of training, injury prevention, and recovery programs. Hence, this study aimed to investigate if muscle and tendon stiffness (i.e., “true” stiffness) are similarly affected by different impulse magnitudes when using the free-oscillation technique. Three impulse magnitudes (impulse 1, 2 and 3), corresponding to peak forces of 100, 150 and 200 N, were used to estimate the stiffness of the ankle joint in 27 males, using multiple loads (10, 15, 20, 25, 30, 35, and 40 kg). A significant decrease (p

Suggested Citation

  • Aurélio Faria & Ronaldo Gabriel & Rui Brás & Helena Moreira & Márcio Soares & Massimiliano Ditroilo, 2023. "Free-oscillation technique: The effect of the magnitude of the impulse applied on muscle and tendon stiffness around the ankle," PLOS ONE, Public Library of Science, vol. 18(6), pages 1-13, June.
    • Handle: RePEc:plo:pone00:0286847
    DOI: 10.1371/journal.pone.0286847
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