Abstract Archive

Children with Autism Spectrum Disorder (ASD) have been shown to exhibit gait abnormalities when compared to children with typical development (TD). Despite this phenomenon, few discernible gait patterns have been revealed among children with ASD. Therefore, no generalized gait characteristics have b...

High knee flexion postures, despite their association with increased joint loading, are frequently adopted in occupational childcare. This study sought to quantify the frequency and depth of high knee flexion postures adopted by childcare workers in order to evaluate their increased risk of knee ost...

The windlass mechanism of the human foot is a well known anatomical feature that causes the height of the medial longitudinal arch (MLA) to rise in response to toe dorsiflexion under constant load.¶ It is interpreted as a stiffening mechanism which is hypothesized to work by increasing the moment a...

This project tested a novel method to assess performance in a countermovement jump test (CMJ) using a smartphone held to the hip. The intended use is to assess a person’s force producing capabilities to track general progress in a health intervention. The results showed repeatable correspondence t...

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Injuries in aquatic sports are often associated with prolonged fatigue due to repetitive motions. These injuries are often more common in females due to an increased endurance. We calculated rate of change in muscle activation in expert aquatic athletes and controls throughout a fatiguing task. Slop...

Force-deflection behavior of trochanteric soft tissue during a fall has been measured using real-time ultrasonography. While there exists no gender difference, trochanteric soft stiffness is affected by pelvis impact configuration, being smallest during posteriolateral pelvis impact.

Recording electromograpy (EMG) signals of deeply located muscles (e.g. iliopsoas) is challenging. The conventional surface and intramuscular EMG recording techniques present potential defects and risks, especially for the patients with pathological tissue close to the measurement site. In this study...

Children and adults with cerebral palsy develop impairments termed contractures that dramatically reduce their function, making activity and participation in the society difficult. An improved understanding of the muscle specific causes for contracture development are needed to develop targeted ther...

Disease-induced impaired hand function leads reduced quality of life and is frequently assessed by physicians in routine care of scleroderma patients. Hand movements are complex and current clinical assessments are subjective or inaccurate. A mixed cohort of scleroderma patients and healthy controls...

Reverse total shoulder arthroplasty (RSA) surgery is an effective treatment strategy for patients with varying shoulder deficiencies. The purpose of this study was to quantify the distribution of bone density in the scapulae of patients undergoing reverse shoulder arthroplasty (RSA) to guide optimal...

Surface electromyograms (EMG) are susceptible to motion artifacts, especially during dynamic non-isometric contractions. A novel method is presented for detecting motion artifact contamination in EMG recordings. Specifically, root mean square (RMS) amplitudes of EMG recordings with two high-pass cor...

Recent work suggests that kinematics-based electrical stimulation can restore trunk stability following neuromuscular impairment. However, knowledge of the relation between body motion and muscle activity during unstable sitting may be beneficial. Our objective was to quantify the spatial and tempor...

Reductions in breast motion from wearing bras have been demonstrated, but relating reductions to subject perceptions of bra effectiveness or correlating reduction to breast size has met minimal success. These shortcomings suggest breast motion, and interaction is not adequately understood. This stud...

We analysed the rate of torque development (RTD) drop-off characteristics of forty anterior cruciate ligament (ACL) reconstructed (ACLR) subjects during maximal quadriceps voluntary isometric contractions (MVIC). We found that the RTD of ACLR limbs drops at a lower percentage of their maximum torque...

To develop assistive devices that can account for muscle dynamics, we developed a machine learning algorithm that measures muscle fascicle lengths in real-time from live ultrasound imaging. Our algorithm’s predictions yielded up to 95% correlation and R2 = 0.89 with respect to hand-tracked images,...

Ultrasonic measurements of rectus femoris echogenicity (ECHO) provide a measure reflecting infiltration of muscle by non-lean tissue (muscle quality). ECHO and subcutaneous fat thickness (SCFT) were related to mobility in older women with knee OA. Over and above obesity, muscle quality is associated...

Anterior cruciate ligament-deficient (ACL-D) individuals had a smaller total support moment (TSM) during stair descent compared to a control group. When examining joint components of the TSM, knee extensor and ankle plantarflexor moments were significantly reduced in the ACL-D group while the hip ex...

Kinetic data acquired from force plates embedded in moving platforms naturally contain artifacts called inertial components; however, their removal requires knowledge of the system’s inertial properties. Our objective was to: develop a method for estimating the inertial properties and force plate ...

The purpose of this study was to quantify the individuality of knee kinematics during running by examining the level of similarity between closely matched runners. Our results suggest that it becomes easier to identify similar runners as the size of a candidate pool increases; however, there is a li...

This study is in the first year of a four year case study that will quantitatively assess the risk of lower extremity injuries, especially those to the knee. Seven healthy female NCAA soccer players from Valparaiso University were evaluated on their preseason and postseason functional movements. In ...

Herein, a novel, scaffold-free fiber engineering platform was utilized to investigate the influence of quasi-static and dynamic uniaxial loading on tendon fiber development. Engineered fibers were subjected to 3 days of basic loading (i.e., intermittent cyclic uniaxial strain) or combined loading (i...

In this cadaveric study, radioulnar load-sharing behaviour at the elbow was investigated at various elbow positions by measuring the force transmitted to the radiocapitellar joint. Results show that pronation with flexed elbow tends to increase axial load transmitted via the radius, while supination...

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Real-time prediction of Achilles tendon strain can be used to inform rehabilitation and training interventions. In this study, we combined an electromyogram (EMG)-informed neuromusculoskeletal (NMS) model of the lower limbs with a surrogate finite element (FE) model of the Achilles tendon to estimat...

Joint mobility plays a part in the performance of competitive sports. It can be used as a training or as a warm-up exercise alone. Good joint mobility can produce better power transmission and exert better competitive level. On the contrary, it may change movement pattern that produce more force on ...

This study investigated the effect of polycarbonate-urethane (PU) interpositional knee spacers on load distribution in 3D printed knee models under the consideration of a potential treatment for knee osteoarthrosis (KOA).

Side-to-side differences in knee biomechanics are considered risk factors for anterior cruciate ligament (ACL) injuries in sports. We found that progressive sport specific sensorimotor training (PSSMT) reduced flexion moment side-to-side differrence during a Drop Jump task. In contrast, machine base...