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J Neurophysiol 91: 2164-2171, 2004. First published December 24, 2003; doi:10.1152/jn.01147.2003
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Movement Reduces the Dynamic Response of Muscle Spindle Afferents and Motoneuron Synaptic Potentials in Rat

Valerie K. Haftel1, Edyta K. Bichler1,2, T. Richard Nichols1, Martin J. Pinter1 and Timothy C. Cope1

1Department of Physiology, Emory University, Atlanta, Georgia 30322; and 2Department of Neurobiology, University School of Physical Education, Poznan 60352, Poland

Submitted 1 December 2003; accepted in final form 23 December 2003

Among the mechanisms that may result in modulation of the stretch reflex by the recent history of muscle contraction is the history dependence observed under some conditions in the response properties of muscle spindles. The present study was designed to test one report that in successive trials of muscle stretch-release, spindle afferent firing during stretch, i.e., the dynamic response shows no history dependence beyond the initial burst of firing at stretch onset. Firing responses of spindle afferents were recorded during sets of three consecutive trials of triangular stretch-release applied to triceps surae muscles in barbiturate-anesthetized rats. All 69 spindle afferents fired more action potentials (spikes) during the dynamic response of the first trial, excluding the initial burst, than in the following two trials. The reduced dynamic response (RDR) was nearly complete after trial 1 and amounted to an average of ~12 fewer spikes (16 pps slower firing rate) in trial 3 than in trial 1. RDR was sensitive to the interval between stretch sets but independent of stretch velocity (4–32 mm/s). RDR was reflected in the synaptic potentials recorded intracellularly from 16 triceps surae {alpha}-motoneurons: depolarization during muscle stretch was appreciably reduced after trial 1. These findings demonstrate history dependence of spindle afferent responses that extends throughout the dynamic response in successive muscle stretches and that is synaptically transmitted to motoneurons with the probable effect, unless otherwise compensated, of modulating the stretch reflex.

Address for reprint requests and other correspondence: V. K. Haftel, Dept. of Biology, Morehouse College, Atlanta, Georgia 30314 (E-mail: vhaftel{at}morehouse.edu).




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