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Related Experiment Videos

Negative interstitial pressure in the peritendinous region during exercise.

H Langberg1, D Skovgaard, J Bülow

  • 1Sports Medicine Research Unit, Department of Rheumatology H, Bispebjerg Hospital, DK-2400 Copenhagen, Denmark. HL02@bbh.hops.dk

Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 14, 1999
PubMed
Summary

Human Achilles tendon exercise generates significant negative tissue pressure in the peritendinous space. This finding suggests a potential mechanism for exercise-induced fluid shifts and increased blood flow in the tendon region.

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Area of Science:

  • Physiology
  • Biomechanics
  • Sports Medicine

Background:

  • The Achilles tendon is crucial for locomotion.
  • Understanding peritendinous tissue pressure during exercise is vital for tendon health.
  • Previous studies noted increased blood flow during exercise, but the underlying mechanism was unclear.

Purpose of the Study:

  • To quantify tissue pressure in the peritendinous area of the human Achilles tendon during rest and exercise.
  • To investigate the effect of varying exercise intensity (torque) on this pressure.
  • To explore the role of negative tissue pressure in exercise-induced fluid dynamics.

Main Methods:

  • Tissue pressure measurements were taken in healthy individuals at rest and during isometric calf exercise at different torques.

Related Experiment Videos

  • Microdialysis with a colloid osmotic agent (Dextran 70) was employed to assess fluid shifts.
  • Measurements were performed at multiple locations proximal to the Achilles tendon insertion.
  • Main Results:

    • A significant, linear decrease in tissue pressure was observed with increasing exercise torque.
    • Negative tissue pressures were consistently generated during exercise, reaching substantial levels.
    • Dialysate volume was fully restored during exercise, indicating fluid shifts were counteracted.

    Conclusions:

    • Exercise generates marked negative tissue pressure in the Achilles tendon's peritendinous space.
    • This negative pressure may drive fluid shifts into the peritendinous tissue.
    • The findings support the hypothesis that negative tissue pressure contributes to exercise-induced hyperemia in the Achilles tendon.