Katherine J. Sullivan

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Motor-skill practice drives subsequent offline activity in functionally related resting human brain networks. We investigated the manner in which offline neural networks are modulated by practice structures that affect motor-skill retention. Interference to dorsolateral-prefrontal cortex (DLPFC), but not to primary motor cortex (M1), after variable practice(More)
BACKGROUND Locomotor training, including the use of body-weight support in treadmill stepping, is a physical therapy intervention used to improve recovery of the ability to walk after stroke. The effectiveness and appropriate timing of this intervention have not been established. METHODS We stratified 408 participants who had had a stroke 2 months earlier(More)
OBJECTIVE To investigate the effect of practice paradigms that varied treadmill speed during step training with body weight support in subjects with chronic hemiparesis after stroke. DESIGN Randomized, repeated-measures pilot study with 1- and 3-month follow-ups. SETTING Outpatient locomotor laboratory. PARTICIPANTS Twenty-four individuals with(More)
BACKGROUND AND PURPOSE A phase II, single-blinded, randomized clinical trial was conducted to determine the effects of combined task-specific and lower-extremity (LE) strength training to improve walking ability after stroke. SUBJECTS The participants were 80 adults who were ambulatory 4 months to 5 years after a unilateral stroke. METHOD The exercise(More)
BACKGROUND When people with stroke recover gait speed, they report improved function and reduced disability. However, the minimal amount of change in gait speed that is clinically meaningful and associated with an important difference in function for people poststroke has not been determined. OBJECTIVE The purpose of this study was to determine the(More)
BACKGROUND Locomotor training using body weight support and a treadmill as a therapeutic modality for rehabilitation of walking post-stroke is being rapidly adopted into clinical practice. There is an urgent need for a well-designed trial to determine the effectiveness of this intervention. The objective of the Locomotor Experience Applied Post-Stroke(More)
This pilot study obtained preliminary data on the effects of acupuncture treatment combined with a standard inpatient stroke rehabilitation program on poststroke motor recovery and physical function. Thirty-two patients with acute stroke were recruited and randomized to 1 of 2 treatment arms: standard rehabilitation (control group) or a combination of(More)
BACKGROUND Task-specific training programs after stroke improve walking function, but it is not clear which biomechanical parameters of gait are most associated with improved walking speed. OBJECTIVE The purpose of this study was to identify gait parameters associated with improved walking speed after a locomotor training program that included(More)
1Motor Behavior and Neurorehabilitation laboratory, Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 E. Alcazar Street, CHP 155, Los Angeles, California 90089, USA 2Neuroplasticity and Imaging Laboratory, Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 E. Alcazar Street, CHP(More)
BACKGROUND AND PURPOSE Outcome measurement fidelity within and between sites of multi-site, randomized, clinical trials is an essential element to meaningful trial outcomes. As important are the methods developed for randomized, clinical trials that can have practical utility for clinical practice. A standardized measurement method and rater training(More)