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Trunk reaction time and three-dimensional trunk-hip motions were compared between subjects with and without chronic low back pain (LBP). The control group demonstrated greater trunk flexion; however, the LBP group reduced trunk flexion to protect against further injuries following the novelty of the...
This study demonstrates a biofeedback method for training adaptable gait. The method involved a customised program and 3D motion capture system. 22 young adults were selected to test the effect of gait adaptability training of two target-oriented stepping tests while walking: (1) vertical foot heigh...
This research describes a new method to quantify external mechanical load during professional rugby league match play. Positional differences during match play are also explored. Outside backs and hit-up forwards spend the majority of match play in low intensity activity, however, outside backs tend...
This study examined whether an introduced forefoot sliding element would influence running biomechanics and performance. Rearfoot strikers performed 10 consecutive running trials on instrumented treadmill, wearing two running shoes with versus without forefoot sliding element. The present results re...
In this study, we aimed to clarify futsal shoe outsoles mechanical properties and demonstrate its effect on resultant performances of a v-cut manoeuvre functional test. One participant performed multiple trials of a pylon course using three shoes, each with different outsole’s dynamic coefficient ...
Many surveyed freefall jumpers report musculoskeletal neck pain. This study measured a jumper’s head and body accelerations during parachute opening shock and reported the mean, standard deviation, and range of the accelerations. Data were collected from 18 members of the U.S. Army Parachute Team,...
Following active muscle lengthening there is less activation (i.e., Electromyography; EMG) required to match a given torque target as compared with a purely isometric contraction. This activation reduction (AR) is typically investigated during torque matching tasks. It is less clear whether followin...
Nonlinear weighting adjustments were implemented to study low back injury potential associated with variable compression exposures. This in vitro study exposed porcine spinal units to cyclic compression paradigms that had consistent and variable peak amplitudes until failure was detected. When weigh...
This study aimed to examine whether fixing the ankle in dorsiflexion vs in plantarflexion affects knee flexion torque and hamstrings activity during ramp isometric contractions. Ten pairs of fine wires were inserted into the four heads of the hamstrings and 15-channel high-density electromyography (...
The Upper Quarter Y Balance Test (YBT-UQ) is a closed-chain upper extremity (UE) test that allows clinicians to assess unilateral UE function in the reaching and the stabilizing limb. There are several aspects of the YBT-UQ that have been studied (reliability, validity, correlations to other functio...
The pathogenesis of osteoarthritis (OA) involves both metabolic and biomechanical factors. However, the mechanistic implications of contributing factors – obesity, adiposity, and metabolic syndrome – have been difficult to determine due to the complexities of their interactions. To gain further ...
Healthcare lacks effective tools to identify patients in danger of post-traumatic osteoarthritis progression. Knee joint inflammation and excessive shear strains due to mechanical loading post-injury have been suggested to promote the disease progression. We developed a mechanobiological algorithm t...
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...
The neural oscillator proposed by Matsuoka can generate complicated and periodic signals by some of the variable parameters and feedback signals. In this study, the relationship among the output signals, the variable parameters and feedback signals was analyzed numerically. In the analysis, a feedba...
Decline in postural control and balance is an established risk factor contributing to falls in older population. An accuracy and affordable assessment device would be beneficial for investigating postural and balance performance which then refer to falls risk management. We examined a) the correlati...
This study compared hip muscle geometry (volumes, length), mechanical potential (moment arms), and strength in patients with developmental dysplasia of the hip (DDH) and healthy controls. Results suggest that abnormal bone structure in DDH creates a mechanical disadvantage for muscles surrounding th...
This study examined the changes in the smoothness of joint torques during therapeutic interventions to sit-to-stand (STS) movement performed by the subjects after stroke. The results showed two expert physiotherapists consistently handled the motions to adjust the smoothness. The effect was observed...
Understanding differences in locomotor biomechanics between walking and running provides fundamental information about human ambulation. Recently, studies of ankle mechanical impedance during locomotion have provided new insight into disturbance response, stability, and energy transfer. Despite stud...
Finite element modeling can be used to evaluate the effects of altered loading conditions on the knee joint stresses, and thus to predict possible failure locations. The aim was to generate finite element models of ACL reconstructed patients (n = 5) with relatively simple soft tissue materials to id...
A procedure is presented by which a non-stationary signal can be partitioned into sections to apply different Butterworth filter cut-off frequencies to respective sections when necessary. The Teager-Kaiser Energy Operator (TKEO) is used to divide the signal into sections based on their energy. The p...
This study investigated a method to use inertial measurement units (IMUs) in certain types of baseball biomechanics research. The method calculates the timing of maximum knee height (MKH) and ball release (BR) using gyroscopic data and defines them as the starting and ending points of the pitching m...
A novel method for accurately measuring carpal kinematics in a cadaveric model was developed via discreet sensors rigidly fixed to carpal bones using single attachment mounts.
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...
The angle of th joint is important information to grasp the exact state of the joint in the human body. In this study, we measured the angular displacement using the optical signal change according to the joint angle change, unlike the conventional joint measurement method.
A 6000% increase in the number of finite element papers published between 1980 and 2009 has been reported [1]. However, finite element convergence and error analysis have not been adequately addressed in the literature. In this study, fundamental relations of finite element convergence analysis were...
The dynamic behaviour of the foot’s medial longitudinal arch (MLA) during running is an important feature capable of storing and returning energy to the system. The possibility of enhancing this feature through training may lead to changes in performance and injury prevention. We conducted a rando...
The strength characteristics of the knee and ankle muscles of high-level athletes have positive significance for better design of exercise training programs and prevention of sports injuries. Taking the Chinese men's volleyball players as the research object, it is found that the balance of the maxi...
The purpose of this study was to determine the effect of varied pelvis perturbations on walking balance and over-ground walking speed in people with incomplete spinal cord injury (iSCI). Eleven subjects with iSCI were recruited. Spatial and temporal gait parameters and muscle activities were assesse...
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