Abstract Archive

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...

I was exposed to biomechanics research first in 1974 when taking an undergraduate class in biomechanics at the Federal Technical Institute in Zurich. I was lucky as the class was taught by the founder and driver of international biomechanics, Dr. Juerg Wartenweiler, whose legacy is immortalized in t...

Falls are significant events for those at greater risk. How peo-ple regulate stepping movements to maintain lateral balance is critical. Here, we quantified how persons with lower limb amputation regulate lateral stepping movements both with and without lateral perturbations.

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...

This study tracked concussions and head impacts with helmet-mounted accelerometers over one high school football season and found that the weeks in which concussions occurred resulted in increased time spent on scrimmaging (a type of practice which simulates games) compared to other drills. These we...

This study aimed to evaluate the activation of the three regions within the infraspinatus muscle during isometric external rotation (ER) exertions while the arm was positioned in different elevation postures. Superior and middle region of the infraspinatus showed similar activations irrespective of ...

Task goals for walking like “stay on your path”, “keep moving forward”, and “maintain step width” are highly intuitive. However, these different individual goals cannot be enacted simultaneously. Instead, humans choose multi-objective options that balance multiple goals across multiple c...

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...

This study examined the role of cutaneous sensory feedback on the soles of the feet for a maximal motor output task. Participants performed maximum vertical squat jumps (MVSJ) under baseline, cooled, and recovered conditions. MVSJ height, jump preparation average force and impulse were lower in the ...

Regular papers should present novel perspectives within the general scope of the conference. Short papers (Work-in-Progress) are an opportunity to present preliminary or interim results. Posters are intended for ongoing research projects, concrete realizations, or industrial applications/projects pr...

Walk is an economic activity, as more efficient mechanical contribution, less is necessary from metabolic input. Patients with chronic heart failure (CHF) and hear transplanted (HT) present peripheral musculoskeletal disorders, dyspnea and fatigue in their activities. Objective: to verify the associ...