J
J.R. Dufresne
Researcher at University of Minnesota
Publications - 6
Citations - 216
J.R. Dufresne is an academic researcher from University of Minnesota. The author has contributed to research in topics: Torque & Reflex. The author has an hindex of 5, co-authored 6 publications receiving 213 citations.
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Journal ArticleDOI
Modulation of the myotatic reflex gain in man during intentional movements.
TL;DR: The results suggest that an internal plan (or model) of the learned task is present, whereby reflex gains can be regulated independently from the motion and alpha-motoneuron activity, and effectively uncouples the reflex motor output from the intentionally controlled motion and maintains spindle sensitivity to external disturbances independent of large changes in muscle length.
Journal ArticleDOI
Reflex motor output to torque pulses in man: identification of short- and long-latency loops with individual feedback parameters.
TL;DR: The best least-squares fit to the model relating average electromyographic activity to forearm angular position, velocity and acceleration was obtained by assuming separate time delays for each kinematic variable.
Journal ArticleDOI
Electromyographic response to pseudo-random torque disturbances of human forearm position
TL;DR: P Pseudo-random torque disturbances applied to the human forearm permitted the identification of linear relationships between motion and biceps/triceps electromyographic activity and support the concept of a continuous feedback control mechanism with adaptive properties.
Journal ArticleDOI
Response to transient disturbances during intentional forearm flexion in man.
TL;DR: The data obtained demonstrate unequivocally that the applied perturbation affects the motor output, irrespective of the speed of the movement.
Book ChapterDOI
Adaptive properties of the myotatic feedback.
TL;DR: This chapter reviews the premises upon which the approach is predicated and defines the terminology introduced, finding that the myotatic feedback could be adequately characterized by a simple linear relation between angular position and its derivatives, the importance of the parameters depending on the operating point.