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  • Title: An investigation of the Jendrassik manoeuvre.
    Author: Gregory JE, Wood SA, Proske U.
    Journal: Acta Physiol Pharmacol Bulg; 2001; 26(3):171-5. PubMed ID: 11695532.
    Abstract:
    Several mechanisms were investigated by which the Jendrassik manoeuvre might potentiate tendon jerk and H-reflexes, recorded here as surface EMG from the triceps surae muscle group. If fusimotor activation is involved, then, after muscle conditioning designed to leave spindles in a slack state, interposing a Jendrassik manoeuvre before reflex testing should have increased reflex amplitude by restoring spindle sensitivity; but this was not the case. The Jendrassik manoeuvre failed to increase facilitation of the soleus H-reflex by a quadriceps volley, contrary to expectations if it operates by presynaptic disinhibition. There was no increase in the level of ongoing EMG during a Jendrassik manoeuvre, indicating that it does not operate by direct facilitation of motoneurones. The Jendrassik manoeuvre produced less reflex potentiation when spindles had a high rate of resting discharge. A remaining, untested mechanism is the modulation of oligosynaptic pathways that may contribute to the largely monosynaptic reflex response.
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