Medicine and Health Sciences Commons^™

Cortical Contribution To Linear, Non-Linear And Frequency Components Of Motor Variability Control During Standing, Niklas König Ignasiak

Physical Therapy Faculty Articles and Research

Motor variability is an inherent feature of all human movements and reflects the quality of functional task performance. Depending on the requirements of the motor task, the human sensory-motor system is thought to be able to flexibly govern the appropriate level of variability. However, it remains unclear which neurophysiological structures are responsible for the control of motor variability. In this study, we tested the contribution of cortical cognitive resources on the control of motor variability (in this case postural sway) using a dual-task paradigm and furthermore observed potential changes in control strategy by evaluating Ia-afferent integration (H-reflex). Twenty healthy subjects …

The Influence Of Divided Attention On Walking Turns: Effects On Gait Control In Young Adults With And Without A History Of Low Back Pain, Jo Armour Smith, James Gordon, Kornelia Kulig

Physical Therapy Faculty Articles and Research

The cognitive control of gait is altered in individuals with low back pain, but it is unclear if this alteration persists between painful episodes. Locomotor perturbations such as walking turns may provide a sensitive measure of gait adaptation during divided attention in young adults. The purpose of this study was to investigate changes in gait during turns performed with divided attention, and to compare healthy young adults with asymptomatic individuals who have a history of recurrent low back pain (rLBP). Twenty-eight participants performed 90° ipsilateral walking turns at a controlled speed of 1.5 m/s. During the divided attention condition they …

Evidence Of Energetic Optimization During Adaptation Differs For Metabolic, Mechanical, And Perceptual Estimates Of Energetic Cost, Natalia Sánchez, Sungwoo Park, James M. Finley

Physical Therapy Faculty Articles and Research

The theory that the sensorimotor system minimizes energetic cost during locomotion has long been supported by both computational models and empirical studies. However, it has yet to be determined if the behavior to which people converge when exposed to a novel perturbation during locomotion is also energetically optimal. We address this issue in the context of adaptation to walking on a split-belt treadmill, which can impose a left-right asymmetry in step lengths. In response to this asymmetry, participants gradually adjust their foot placement to adopt steps of equal length. Here, we characterized metabolic, mechanical, and perceptual estimates of energetic cost …

Lower Extremity Motor Impairments In Ambulatory Chronic Hemiparetic Stroke: Evidence For Lower Extremity Weakness And Abnormal Muscle And Joint Torque Coupling Patterns, Natalia Sánchez, Ana Maria Acosta, Roberto Lopez-Rosado, Arno H. A. Stienen, Julius P. A. Dewald

Physical Therapy Faculty Articles and Research

Although global movement abnormalities in the lower extremity poststroke have been studied, the expression of specific motor impairments such as weakness and abnormal muscle and joint torque coupling patterns have received less attention. We characterized changes in strength, muscle coactivation and associated joint torque couples in the paretic and nonparetic extremity of 15 participants with chronic poststroke hemiparesis (age 59.6 ± 15.2 years) compared with 8 age-matched controls. Participants performed isometric maximum torques in hip abduction, adduction, flexion and extension, knee flexion and extension, ankle dorsi- and plantarflexion and submaximal torques in hip extension and ankle plantarflexion. Surface electromyograms (EMGs) …

The Motor Cortical Representation Of A Muscle Is Not Homogeneous In Brain Connectivity, Jo Armour Smith, Alaa Albishi, Sarine Babikian, Skulpan Asavasopon, Beth E. Fisher, Jason Kutch

Physical Therapy Faculty Articles and Research

Functional connectivity patterns of the motor cortical representational area of single muscles have not been extensively mapped in humans, particularly for the axial musculature. Functional connectivity may provide a neural substrate for adaptation of muscle activity in axial muscles that have both voluntary and postural functions. The purpose of this study was to combine brain stimulation and neuroimaging to both map the cortical representation of the external oblique (EO) in primary motor cortex (M1) and supplementary motor area (SMA), and to establish the resting-state functional connectivity associated with this representation. Motor evoked potentials were elicited from the EO muscle in …

Role Of Corpus Callosum Integrity In Arm Function Differs Based On Motor Severity After Stroke, Jill Campbell Stewart, Pritha Dewanjee, George Tran, Erin Burke Quinlan, Lucy Dodakian, Alison Mckenzie, Jill See, Steven C. Cramer

Physical Therapy Faculty Articles and Research

While the corpus callosum (CC) is important to normal sensorimotor function, its role in motor function after stroke is less well understood. This study examined the relationship between structural integrity of the motor and sensory sections of the CC, as reflected by fractional anisotropy (FA), and motor function in individuals with a range of motor impairment level due to stroke. Fifty-five individuals with chronic stroke (Fugl-Meyer motor score range 14 to 61) and 18 healthy controls underwent diffusion tensor imaging and a set of motor behavior tests. Mean FA from the motor and sensory regions of the CC and from …

What Is The Contribution Of Ia-Afference For Regulating Motor Output Variability During Standing?, Niklas König Ignasiak

Physical Therapy Faculty Articles and Research

Motor variability is an inherent feature of all human movements, and describes the system‘s stability and rigidity during the performance of functional motor tasks such as balancing. In order to ensure successful task execution, the nervous system is thought to be able to flexibly select the appropriate level of variability. However, it remains unknown which neurophysiological pathways are utilized for the control of motor output variability. In responding to natural variability (in this example sway), it is plausible that the neuro-physiological response to muscular elongation contributes to restoring a balanced upright posture. In this study, the postural sway of 18 …

Dual-Task Does Not Increase Slip And Fall Risk In Healthy Young And Older Adults During Walking, Rahul Soangra, Thurmon Lockhart

Physical Therapy Faculty Articles and Research

Dual-task tests can identify gait characteristics peculiar to fallers and nonfallers. Understanding the relationship between gait performance and dual-task related cognitive-motor interference is important for fall prevention. Dual-task adapted changes in gait instability/variability can adversely affect fall risks. Although implicated, it is unclear if healthy participants’ fall risks aremodified by dual-task walking conditions. Seven healthy young and seven healthy older adults were randomly assigned to normal walking and dual-task walking sessions with a slip perturbation. In the dual-task session, the participants walked and simultaneously counted backwards from a randomly provided number. The results indicate that the gait changes in dual-task …

Physical Therapist Students’ Development Of Diagnostic Reasoning: A Longitudinal Study, Sarah Gilliland

Physical Therapy Faculty Articles and Research

Background and Purpose. Clinical reasoning is a complex problem-solving process that is necessary for effective clinical practice in physical therapy. Within the process of clinical reasoning, a physical therapist’s diagnostic reasoning should address the patient’s functional movement abilities and the impact of the patient’s condition on his or her ability to participate in life activities. This longitudinal study examined the development of entry-level physical therapist students’ diagnostic reasoning processes across time in their doctor of physical therapy education.

Methods. Qualitative methods were used to analyze participants’ diagnostic reasoning during a simulated patient case scenario. Six physical therapist students …

Occupational Therapy And Physiotherapy Education And Workforce In Anglophone Sub-Saharan Africa Countries, Augustine O. Agho, Emmanuel John

Physical Therapy Faculty Articles and Research

Background: Sub-Saharan Africa (SSA) countries are faced with the challenge of educating a critical mass of occupational therapists (OTs) and physiotherapists (PTs) to meet the growing demand for health and rehabilitation services. The World Federation of Occupational Therapy (WFOT) and World Confederation of Physical Therapy (WCPT) have argued for the need of graduate-level training for OTs and PTs for decades. However, very few studies have been conducted to determine the availability of OT and PT training programs and practitioners in SSA countries.

Methods: Initial data were collected and compiled from an extensive literature search conducted using MEDLINE and …