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The relationship between countermovement jump (CMJ) performance and foot anthropometric measures were investigated. For women, a strong negative correlation existed¶ between foot length and CMJ performance as well as toe length and CMJ performance. This was not the case for men. These results highl...
Motor control complexity, calculated from muscle synergies, offers a convenient metric to evaluate impairment level in individuals with neuromuscular disorders; however, the role of such measures in rehabilitation remains unclear due, in part, to a limited understanding of the modulability of motor ...
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...
Stair navigation is a risky task for older adults and people with balance disorders. In this study, we evaluated the effect of stair nosing design and handrail use on centre-of-mass (COM) control during ascent and descent. COM anterior displacement was affected by stair nosing, while handrail use de...
Cervical spine loads associated with non-injurious physical activities that involve notably asymmetrical coronal motion of the head and neck have not to date been reported in the literature. In the current study, three-dimensional forces and moments are calculated at the upper cervical spine from th...
Quantifying shoulder motion using body-worn inertial measurement units (IMUs) is not straight forward and requires addressing numerous challenges. We describe these challenges and use a sample data set to illustrate effects of protocol and algorithm choices on calculated shoulder angles. Finally, we...
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...
A cadaver model was utilized to determine operating muscle lengths of the infraspinatus, teres minor, and subscapularis through the internal-external rotation range of motion before and after implantation of reverse shoulder arthroplasty (RSA) components with a lateralized glenosphere. All three mus...
The Hintegra® arthroplasty allows ankle movements at sagittal plane, and therefore contribute to restore gait. However, impairments still are observed after rehabilitation and could rely on neuromuscular activation. We determined the timing and amplitude of co-activation of the tibialis anterior an...
This study characterized macroscopic cortical bone material properties and porosity in severe osteogenesis imperfecta (OI). Specimens were from long bone diaphyses of three children with severe OI and five controls of typically developing pediatric bone. They were machined into miniature beams, imag...
Impact sound has been suggested to be an auditory feedback to modify footstrike pattern with an intention to reduce the vertical loading rates and injury risk in runners. However, the isolated effect of a change in footstrike pattern on the impact sound and vertical loading rates remains unclear. Th...
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...
Carpal tunnel syndrome is caused by compression of the median nerve in the carpal tunnel. Division of the transverse carpal ligament is a routine surgical procedure to treat the hand problem. We have developed alternative biomechanical approaches to carpal arch space augmentation by radioulnar wrist...
To observe differences in centre of pressure (COP) trajectories of 15 low back pain subjects during gait at three different walking speeds, a vector field statistical analysis was conducted. Medial-lateral COP showed medialisation (1) at fast walking speed, at transition between shock absorption pha...
Neck pain and discomfort are commonly reported among both civilian and military parachutists. Such pain and discomfort can limit an individual’s cervical spine range of motion (CROM). CROM is an important factor in performing typical daily tasks and when limited individuals may compensate by incre...
There is a paucity of literature investigating the influence of foot strike posture on Achilles Tendon (AT) forces; a common site for lower limb overuse injuries. Fifteen male distance runners ran on an instrumented treadmill executing both, natural and imposed rearfoot (RFS) and forefoot (FFS) stri...
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 ...
The purpose of the study was to investigate the effect of mechanical loading on serum biomarker concentrations of articular cartilage in relation to knee joint mechanics. Thirty minutes of moderate running exercise caused an increase in all analyzed serum biomarker concentrations. However, no direct...
Mechanisms for rapid stroke-induced bone loss are unknown. Using a mouse stroke model, we examined whether vascular changes in bone may contribute. Compared to sham, stroke mice had transiently lower perfusion yet higher blood vessel volume in hindlimb bones; these vessels were larger and located fa...
Self-administered interventions are an important clinical tool, but the ability to quantify the quality of these interventions is lacking from both the home and clinic. Here we use a wearable sensor and a custom analysis framework to evaluate the efficacy of video-guided and self-applied Epley maneu...
The present study investigated whether a squat training increase knee and hip flexion and extension strength. Twenty-four healthy young men were randomly assigned to a training group (n = 12) or a control group (n = 12). The training group performed a squat training program with 40% of 1-repetition ...
We investigated whether the effects of ankle foot orthoses (AFOs) and AFO-tuning using incremented heel height is comparable between overground and treadmill walking in healthy adults. Results of this study indicate that small but consistent differences between treadmill and overground walking exist...
Understanding the cartilage micro-environment has significant implications for evaluation of mechanobiological function of diarthrodial joints. The goal of this study was to measure the 2D strains through the cartilage thickness when dynamic mechanical loads of physiological relevance are applied. A...
Centre of Pressure (CoP) trajectories were derived from participants walking barefoot, minimally shod and in their conventional footwear. Results showed minimally shod walking to be intermediate between barefoot and conventionally shod walking.
Elliptical chainrings have been designed to manipulate the radius as a function of crank angle, consequently altering the crank angular velocity profile experienced through the pedal cycle. We tested chainrings with varying levels of eccentricity and crank orientations to drive a musculoskeletal mod...
Load carriage is an essential component of combat related roles in military populations. Warfighters are regularly required to walk at velocities more routinely associated with running, known as forced marching (FM). There is a paucity of research regarding the effects of FM on knee total joint mome...
The study was investigated the relationship between changes in the performance of vertical jumps and punch velocity in karate. Variations in relative force (RF) and vertical impulse (VI) are the associated the velocity peak of fist (VPF). Therefore, there is a high contribution the lower body muscle...
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...
A novel testing system was developed to evaluate the mechanical characteristics of shoes in the same laboratory where biomechanical data are to be collected. Compressed height, change in height with compression, and initial and late stiffness were compared between left and right shoes for 10 pairs o...
Abnormal coordination is associated with greater post-stroke impairment. However, it is unclear whether these coordination patterns emerge as a compensation to kinematic constraints such as increased muscle tone. In this work, we characterized the muscle coordination patterns in 14 healthy individua...
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