Changes in equilibrium point are frequently short-lived
equilibrium point equilibrium point

In this example, decreasing the flexors' composite stiffness also decreases their length-tension curve's slope, and shifts Ep to the right.

However, the shift also produces a decrease in the equilibrium moment. Exposed to these relatively low levels of force in the extensors, the viscoelastic tissue in the flexors will exhibit hysteresis.

The flexors may return to their original length unless:

  1. we can maintain the flexors at a constant length until we observe stress relaxation
    OR
  2. sustained force in the extensors produces creep in the flexors

Accordingly, interventions must address force development in the extensors as well as the flexors.

Last updated 7-30-97
Dave Thompson PT