Alexander Stamenkovic

Alexander Stamenkovic
Virginia Commonwealth University | VCU · Department of Physical Therapy

PhD

About

37
Publications
3,624
Reads
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72
Citations
Introduction
Currently investigating trunk mechanics with Prof. James Thomas in the newly developed VCU Motor Control Lab on NIH-funded Project VIGOR (Virtual Immersive Gaming to Optimize Recovery in low back pain). My PhD within the Neural Control of Movement Laboratory (UOW) investigated the interaction between neural processes and muscular coordination during voluntary changes to posture and balance. Particularly interested in probing the link between structure and function of the neuromuscular system through non-invasive methods (e.g. TMS), to determine the role of cortical and subcortical mechanisms underlying the coordination of posture and movement.
Additional affiliations
November 2018 - present
Virginia Commonwealth University
Position
  • PostDoc Position
June 2012 - December 2012
University of Wollongong
Position
  • Subject Co-ordinator
Description
  • Responsible for providing subject content in lecture format, liasing with students, assessment marking, administration and successful operation of a 2nd year Musculo-skeletal Anatomy subject (UOW Code - MEDI220)
March 2012 - June 2018
University of Wollongong
Position
  • PhD Student
Education
November 2018 - June 2022
Virginia Commonwealth University
Field of study
  • Rehabilitation Sciences
April 2012 - December 2018
University of Wollongong
Field of study
  • Neurophysiology
February 2011 - December 2011
University of Wollongong
Field of study
  • Exercise Science

Publications

Publications (37)
Article
Full-text available
Muscle activity preceding the onset of voluntary movement has been shown to reduce centre of mass (CoM) displacement and stabilise the body during self-induced 'perturbations'. However, based on recent findings in the lower limb, where preparatory muscle activity creates the dynamics necessary for the initiation of movement, this study sought to in...
Article
If a whole body reaching task is produced when standing or adopting challenging postures, it is unclear whether changes in attentional demands or the sensorimotor integration necessary for balance control influence the interaction between visuomotor and postural components of the movement. Is gaze control prioritized by the central nervous system (...
Article
Full-text available
Fear of falling influences postural strategies used for balance, and is key in the maintenance of independent living and quality of life as adults age. However, there is a distinct need for methodology that aims to specifically address and prime fear under dynamic conditions, and to better determine the role of fear in movement preparation. This pr...
Article
Postural and movement components must be coordinated without significant disturbance to balance when reaching from a standing position. Traditional theories propose that muscle activity prior to movement onset create the mechanics to counteract the internal torques generated by the future limb movement, reducing possible instability via centre of m...
Article
Full-text available
Chronic low back pain (cLBP) rates among younger individuals are rising. Although pain and disability are often less severe, underlying changes in trunk behavior may be responsible for recurrence. We examine the biomarker capacity of a simple Trunk Compliance Index (TCI) to distinguish individuals with and without cLBP. A random subset (n = 49) of...
Article
Full-text available
Mounting evidence suggests that motor evoked potentials (MEPs) recorded in upper limb muscles with postural support roles following transcranial magnetic stimulation receive contributions from both corticospinal and non-corticospinal descending pathways. We tested the hypothesis that neural structures responsible for regulating upright balance are...
Article
Full-text available
Trunk control and postural instability remain critical markers of functional status in Parkinson’s Disease (PD). As pharmacological and invasive neuro-stimulation interventions provide only limited benefits for trunk and postural control, exercise-based interventions may provide the only effective path to improving functional outcomes for balance i...
Article
Full-text available
The vestibular ocular reflex (VOR) provides gaze stability during head movements by driving eye movements in a direction opposing head motion. Although vestibular-based rehabilitation strategies are available, it is still unclear whether VOR can be modulated by training. By examining adaptations in gaze stabilization mechanisms in a population with...
Article
Background: Complex movement pathologies that are biopsychosocial in nature (eg, back pain) require a multidimensional approach for effective treatment. Virtual reality is a promising tool for rehabilitation, where therapeutic interventions can be gamified to promote and train specific movement behaviors while increasing enjoyment, engagement, and...
Article
Background Identifying altered motor control patterns during functional movements in patients with chronic non-specific low back pain (LBP) has important clinical implications for reducing the risk of recurrence. While prior research has shown that magnitudes of lumbar and hip motion are not altered in patients with chronic non-specific LBP, it is...
Article
Postural muscle activity precedes voluntary movements of the upper limbs. The traditional view of this activity is that it anticipates perturbations to balance caused by the movement of a limb. However, findings from reach-based paradigms have shown that postural adjustments can initiate center of mass displacement for mobility, rather than minimiz...
Article
This systematic review aimed to synthesize the existing evidence of extended reality (XR) on pain and motor function outcomes in patients with back pain. Following the Cochrane guidelines, relevant articles of any language were selected by two independent reviewers from CINAHL, Cochrane, Embase, Medline and Web of Knowledge databases. Of 2,050 uniq...
Data
Online corrections of arm movements to visual targets is dependent upon proprioceptive and visual feedback of the arm and body. We asked participants to perform online corrections of arm movements during stance in 2 conditions: 1) full vision of the arm and body, and 2) vision only of final target position. Data shows unperturbed reach movements (l...
Article
Background Visual representation of oneself is likely to affect movement patterns. Prior work in virtual dodgeball showed greater excursion of the ankles, knees, hips, spine, and shoulder occurs when presented in the first-person perspective compared to the third-person perspective. However, the mode of presentation differed between the two conditi...
Preprint
BACKGROUND Visual representation of oneself is likely to affect movement patterns. Prior work in virtual dodgeball showed greater excursion of the ankles, knees, hips, spine, and shoulder occurs when presented in the first-person perspective compared to the third-person perspective. However, the mode of presentation differed between the two conditi...
Poster
Full-text available
BACKGROUND AND AIM: Anxiety associated with a Fear of Falling (FoF) is common among older adults and is a predictor of future falls risk. The influence of a perceived threat to balance for adults exhibiting high FoF manifest as changes in both static postural and dynamic locomotor behaviour. However, these studies often focus on alterations between...
Conference Paper
Full-text available
Background & Aim: Reaching is a daily occurrence requiring precise control of the arm, body and limbs to be successfully achieved. Generally, the volitional arm movement is preceded by postural muscle activity in the lower limb and trunk which create movement of the body and center of mass (CoM) towards the target. We have previously shown that in...
Conference Paper
Full-text available
Eye-head movements are often tightly coupled to ensure correct visuomotor coordination. During reaching, evidence suggests that the integration of an arm movement may be enough to weaken this coordination (Pelz et al., 2001). Moreover, eye movements are known to change in latency during visuomotor tasks involving whole body movements, such as turni...
Article
Full-text available
When a single light cue is given in the visual field, our eyes orient towards it with an average latency of 200 ms. If a second cue is presented at or around the time of the response to the first, a secondary eye movement occurs that represents a re-orientation to the new target. While studies have shown that eye movement latencies to ‘single-step’...
Article
Full-text available
During the early period of running after cycling, EMG patterns of the leg are modified in only some highly trained triathletes. The majority of studies have analysed muscle EMG patterns at arbitrary, predetermined time points. The purpose of this study was to examine changes to EMG patterns of the lower limb at physiologically determined times duri...
Conference Paper
Full-text available
Background & Aim: As the largest segment of the body, the trunk has a great ability to influence stability and successful movement production in a reaching task. The central nervous system (CNS) has traditionally been thought to minimise shifts of the centre of mass position by countering reaction torques imposed by the arm movement, thus prioritis...
Conference Paper
Full-text available
Background & Aim: Smooth movements necessary throughout life can be attributed to the ability of the central nervous system to interpret sensory inputs and respond with complementary motor action commands. Goal-directed tasks such as reaching require a coordinated whole body strategy which needs to a) identify (direct gaze to) the goal and b) succe...
Conference Paper
Full-text available
Background and Aim: Studies have investigated the effects of prior cycling on the neuromuscular and physiological characteristics of running. They have revealed that during the early period of running after cycling (<3mins), EMG patterns of the lower limb are modified in some highly trained triathletes (e.g., 36% of those tested, Chapman, 2008). Th...
Conference Paper
Full-text available
Background and aim: When a sole light cue is presented in the visual field, gaze automatically orients to the target. The illumination of a second light target during this response induces another gaze shift, involving the correction of the initial reactive response. When seated, both types of saccadic eye-movements are delayed in the elderly, comp...
Conference Paper
Full-text available
Background and aim: We have shown that, when an ongoing voluntary movement executed towards a visual target is perturbed by a sudden change in target position, postural adjustments accompanying the change in arm trajectory precede the muscle activity involved in trajectory correction. This study investigated if such a predictive mode of postural co...
Poster
Full-text available
Background and aim: We have shown that, when an ongoing voluntary movement executed towards a visual target is perturbed by a sudden change in target position, postural adjustments accompanying the change in arm trajectory precede the muscle activity involved in trajectory correction. This study investigated if such a predictive mode of postural co...
Article
Full-text available
Background: Research training should facilitate effective researcher role development. While researcher roles require the performance of specialized knowledge and skill, they also require development of personal research identities within social contexts. Interaction with research peers can provide opportunities for reflective role development. Ad-...
Conference Paper
Full-text available
INTRODUCTION The ability to interact with our external environment, through volitional, dynamic acts such as reaching and grasping, requires the complex integration and computation of multiple, often ‘noisy’, afferent and efferent signals by the central nervous system (CNS). In a healthy cohort the successful initiation of a reaching movement of th...
Conference Paper
Full-text available
Comparisons of muscle activity between IR and C-R conditions are plotted in Figure 2 as the average (± SD) waveform for all recorded muscles presented for one individual participant. Individual recruitment patterns for all muscles were similar between the IR and three C-R sample periods. The variability of each average trace slightly increased thro...
Conference Paper
Full-text available
A smooth coordination between posture and voluntary movement is dependent upon postural adjustments in the lower limbs to create the dynamic conditions necessary for maintaining balance. Such adjustments occur in a feed-forward manner and have been considered to ensure stability or prepare the system for the upcoming volitional movement. Postural a...
Article
Introduction: Despite structural distinction between the transverse and oblique heads of the adductor pollicis, in vivo testing continues to consider the adductor pollicis as functionally simplistic. As a muscle's architecture is a strong indicator of function, in this study we aimed to determine whether the physiological cross-sectional areas (PC...
Conference Paper
Full-text available
Introduction: We have previously shown that online corrections of reaching movements performed in standing evoke postural adjustments that occur before corrections to the arm muscles (Leonard et al. 2011). When visual target shifts are presented during a reaching movement in the direction opposite to the on-going reach (ipsilateral target shift), p...
Article
Purpose: Despite the clear structural distinction between the transverse and oblique heads of the adductor pollicis, skeletal muscle testing continues to consider the adductor pollicis as functionally homogenous. As muscle architectural measures, especially physiological cross-sectional area (PCSA), are strong indicators of function, this study aim...

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