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Normal subjects performed bilaterally symmetric rapid elbow flexions or extensions ("focal movements") while standing. Specific patterns of electromyographic activity in leg and trunk muscles ("associated postural adjustments") were seen for each type of movement. The biomechanical significance of these postural adjustments was analysed by means of the(More)
In standing humans, it is not certain whether anticipatory postural adjustments associated with rapid, voluntary elbow flexion movements (focal movements) originate as a selection from preset synergies or as the result of specific planning of motor commands. We studied these muscle recruitment patterns when the same focal movement was made under behavioral(More)
OBJECTIVE To assess gait in patients with autism. DESIGN Clinical and physiologic assessment. SETTING Research hospital. PATIENTS AND SUBJECTS Five adults with autism and five healthy, age-matched control subjects. MAIN OUTCOME MEASURE(S) Clinical and biomechanical assessment. RESULTS Clinical assessment showed mild clumsiness in four patients and(More)
OBJECTIVE It was our primary objective to provide evidence supporting the existence of neural detectors for postural instability that could trigger the compensatory adjustments to avoid falls. METHODS Twelve young healthy subjects performed self-initiated oscillatory and discrete postural movements in the anterior-posterior (AP) directions with maximal(More)
OBJECTIVE To investigate retest reliability and concurrent validity of the fundamental measurements made of a posturographic protocol that employs quiet standing to quantify the severity and the nature of patients' postural disturbances. STUDY DESIGN Retrospective complete block design. SETTING Geriatric rehabilitation department. PARTICIPANTS(More)
OBJECTIVE To evaluate how painful metatarsal arthritis affects foot and ankle mechanics and mobility. METHODS We studied 16 symptomatic forefeet in 10 patients with rheumatoid arthritis (RA) and compared them with 14 asymptomatic forefeet in 7 nonarthritic subjects. RA limbs with significant disease at other locations were excluded. We measured pain and(More)
BACKGROUND The ability to redirect the path of the foot during walking is critical for responding to perturbations and maintaining upright stability. The purpose of the current study was to compare mechanisms of reactive stepping adjustments in young versus older adults when responding to an unexpected perturbation during voluntary step initiation. (More)
We hypothesized that defining joint power (JP) merely on the basis of joint rotations ignores important translational power terms, and may not adequately represent the energy flow profile for a given muscle group. A novel six degree-of-freedom (6 DOF) model of the ankle complex was implemented, accounting for previously ignored joint translations as well as(More)
OBJECTIVES To investigate the relationships between the severity of flexed posture (FP), skeletal fragility, and functional status level in elderly women. DESIGN Cross-sectional study. SETTING Geriatric rehabilitation research hospital. PARTICIPANTS Sixty elderly women (aged 70-93) with FP referred to a geriatric rehabilitation department for chronic(More)
OBJECTIVE To test the suitability of using biomechanic measures associated with a minimum measured input model (MMIM) approach to assess mobility of people with chronic stroke during the execution of a sit-to-stand (STS) to upright posture motor task. DESIGN Single group, observational. SETTING Institutional settings in the United States and Italy. (More)