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The use of platelet-rich plasma (PRP) injections in the treatment of acute Achilles tendon rupture (ATR) remains controversial. This double-blinded, randomized controlled trial aimed to compare the effectiveness of PRP versus placebo injections in non-operatively treated ATR patients. Estimates of t...
We aimed to clarify the speed and accuracy in center of mass (COM) control during anticipatory postural adjustment (APA) and step phases in a step task where different levels of accuracy were required. Twelve subjects stepped onto stayed on bars with 2, 4, 6, and 8 cm width. The ground reaction forc...
The purpose of this research was to identify baseline strength measures that may be predictive of resistance to fatigue during an extended load-bearing military march. Step-wise regression models accounted for 30 - 46% of the variability in how pace, step length, and stance time changed with fatigue...
Hip-related pain is a common cause of lower-limb musculoskeletal pain and a potentially debilitating diagnosis in football players. This study aimed to examine the relationship between hip strength and hip joint kinematics during walking, to assist in the development of targeted interventions.
Patellofemoral joint stress (PFJS) was used to quantitatively assess the biomechanic characteristics of the patellofemoral joint of older adults when descending the stairs. Compared with young adults, older adults had lower knee moment in the sagittal plane, quadriceps strength, and PFJS, which may ...
Purnima Padmanabhan and Dr. Ryan Roemmich research interests include the control of gait in persons with neurological disorders and the design of gait rehabilitation strategies. Here they will discuss their recent and exciting findings that leverage energy optimization to enhance gait retraining for...
Kinematic and electromyography data were collected from nine participants with transtibial amputation (TTA) while walking over ground using a powered and a non-powered prosthesis. Peak EMG amplitude of the major thigh muscles was compared across prostheses and sides. There was no significant effect ...
While body-powered prostheses are the preferred devices following transradial limb loss, the compensatory strategies they elicit are currently not well understood. This study aims to identify at which upper body joints compensation occurs. Based on the findings, body-powered prosthesis users compens...
With recent developments in the resolution with which spine skin-surface motion is tracked, the opportunity presented itself to calculate the effects of creep deformation on spine motion during manual lifting across smaller sub-regions of the lumbar spine. Study results demonstrated that lumbar spin...
A physical model simulating the right hip joint was placed in known combinations of 3D rotations. Euler/Cardan angles were used to calculate the 3D rotations from reflective marker data, and different rotation sequences were compared to the physical model. The ‘xyz’ (proximal segment as referenc...
We developed and validated a novel rheological model of anterior cruciate ligament (ACL) loading. The ACL force (FACL) responses to cadaveric knee loading were interpolated using novel basis functions and cross-terms to account for observed non-additivity of uni-planar loading mechanisms. Resulting ...
Inertial Measurement Units (IMUs) became extremely popular for human motion analysis in the free-living environment thanks to their small size, lightweight, and long battery life [1,2]. However, IMU measures the acceleration and angular velocity in its sensor-fixed frame (SF), not the anatomical fra...
We present methodology to integrate motion capture with a plantar/shear stress measurement device. The combined system can be used to characterize foot plantar tissue deformation and calculate multi-segment foot joint kinetics.
Drs. Jessica Selinger and Max Donelan, co-organizers of this symposium, will begin by providing an overview of energy optimization and its central role in shaping our behaviour, as well as its explanatory limits.
Tensile properties of native and acellular human dura mater are of increasing interest for transplant surgery. The biomechanical properties of 18 cadaver-matched pairs of acellular and native human dura mater samples were investigated here. An individually-established osmotic stress protocol and the...
Arm injuries in baseball pitchers are highly prevalent at all levels of the sport. By utilizing wearable inertial measurement units (IMUs), we aim to develop a day-to-day monitoring system that can quantify player-specific variations in pitching mechanics to enable more precise pitching workload pro...
This research examined the changes in gait throughout loaded military march. Data on pace, step length, stance time, and cadence were collected in the field during a dismounted military movement. The results showed that all gait metrics tended to decline with fatigue until approximately 65% completi...
Dr. Wong applies computational models and human experiments to questions across the realms of sensorimotor control, from reaching to energy optimization in locomotion. Here he will discuss his recent work towards understanding how the nervous system senses energy use by investigating the role of blo...
This work outlines the development and performance of a 3D scanning system incorporating multiple Intel RealSense Depth Cameras. The system can capture time-varying colored 3D scans at up to 60 frames-per-second. Software was developed to align and process images from multiple cameras into a pointcl...
Turning gait is important to everyday activity but has yet to be fully explored. In this study a clinical dual-task (DT) assessment using a 180˚ guided turn, instrumented with an inertial measurement unit (IMU), was applied to concussed subjects. Subjects had increased turn time at 72hrs and 1wk po...
Humans typically prefer metabolically economical gait patterns, as evidenced by increases in metabolic cost that accompany large deviations from the preferred step length and step width. Alterations of the mechanical context tend to evoke changes in the preferred gait mechanics that are consistent w...
We investigated the effect of a continuous upward force applied to the arm on shoulder neuromuscular activity and kinematics in healthy young adults. With assistance compared to without, muscle activity was lower in muscles contributing to shoulder elevation and unchanged in other muscles. The shoul...
Plantar fascia shear modulus was assessed in healthy participants, participants with plantar fasciitis and active pain, and participants with a history of plantar fasciitis, but no current pain. Plantar fascia stiffness was lower in the symptomatic group than either the healthy or asymptomatic group...
In-depth exploration of movement variability provides a window into neuromotor control. This study examined movement variability differences between the preferred kicking and stance limbs in healthy persons performing unipedal hopping under typical and challenging conditions. Participants maintained...
We used a robotic gait simulator to calibrate and validate the in situ relationship between squared shear wave speed and axial stress in cadaveric Achilles tendons. We first performed isometric plantarflexion simulations at multiple ankle angles to assess linearity and posture-dependence, and to est...
A bout of eccentric exercise confers protective effect against muscle damage after the same exercise performed several weeks later, which is known as the repeated bout effect (RBE). We investigated whether the RBE magnitude would be different between maximal voluntary contraction (MVC) torque and ra...
The aim of this study was to compare the minimum and maximum values of gait patterns at different speeds predicted by two different methods: PEAK (based solely on the peak values), and CYCLE (based on the full gait cycle). We used gait data recorded at different speeds from a public repository as th...
The purpose of this study was to determine whether a countermovement jump could reliably be used as a substitute or dynamometer strength testing. Eighty-six high school basketball athletes were tested, and results indicate that as countermovement jump peak force, power, and impulse increase, peak co...
Foot insoles are frequently prescribed in routine clinical practice to prevent or treat foot deformities or functional alterations. Currently adopted procedures for foot insoles manufacturing vary among clinical practitioners and manufacturers and decisions are mainly left to the experience of the o...
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