SUMMARY AND CONCLUSIONS

nerve cuff catheters were used to record the activity of individual muscle spindle afferents during treadmill walking as low doses of li-docaine were infused around the femoral nerve to progressively block gamma motoneuron activity. 2. Both primary and secondary endings from both the monarticular knee extensors and the biarticular hiplknee muscles of the anterior thigh showed large decreases in afTer-ent activity, usually well before changes in the electromyographic activity, force output, or length and velocity were seen in the parent muscles. 3. This decline in the proprioceptive signa