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Measuring landing kinetics during the single hop test provides valuable injury risk information and is clinically feasible. This study compares landing kinetics during a single hop between females with and without an anterior cruciate ligament reconstruction (ACLR). ACLR patients had shorter hop dis...
Subject-specific lateral trunk lean (LTL) gait modification (GM) decreased knee abduction moment (KAM) magnitude on average by 8.9%, although not statistically significant. There was a concurrent increase in trunk kinetics, which is indicative of increased spinal loading. Over prolonged periods, exp...
Muscle-based simulations have predicted the metabolic cost of locomotion with varying success. We investigated if independent recruitment of motor units within a muscle could reduce the predicted cost. We predicted metabolic cost using experimental data of walking and simulations that consisted of i...
This study investigated whether the individual differences in knee extensor fatigue induced by sustained middle-level contraction are explained by one or more indices of muscle fatigue. Twenty-four healthy young men performed a sustained fatiguing contraction to task failure at 40% of maximal volunt...
Osseointegrated prostheses for individuals with lower limb amputation are an alternative to socket-based prostheses that mitigate the residual limb pain and discomfort at the socket stump interface during walking. In transfemoral amputees, propulsion is primarily generated by the prosthesis, with co...
In accordance to Panjabi’s spinal stability model, if a deficit existed in one spinal stability system another system is thought to compensate to maintain spinal stability. This study examined whether those with delayed trunk reflexes did modify muscle activation patterns to complete a dynamic lif...
An induced power analysis was implemented on the throwing motion of the trunk, upper arm, and forearm during baseball pitching to decompose the energetic contributions to elbow valgus loading. Trunk flexion and rotation torques generated energy in arm-cocking and contributed more than half the energ...
Occupations with regular exposure to squatting have a greater risk of developing knee osteoarthritis. To determine the effects of squatting exposures on subsequent knee power generation and concurrent muscle oxygenation, participants completed cyclic and sustained squatting exposures, with countermo...
A musculoskeletal simulation study is necessary to identify the cause-effect relationship between hip abductor weakness and ACL loading during athletic events such as landing and jumping. The purpose of this study was to identify the effect of weakness of hip abductors on lower extremity kinematics ...
A descriptive kinematic analysis was performed to compare stance width, foot orientation, and sagittal angle of the ankle, knee, hip and trunk between self-selected and a spine motion- constrained lifting technique. When lumbar spine motion was constrained, hip flexion, knee flexion and ankle dorsif...
Patient-specific computational models of the knee joint have the potential to diagnose the early onset of osteoarthritis and help surgeons in identifying the appropriate intervention to mitigate or prevent disease progression. An in vitro subject-specific finite element model of a human knee joint w...
The purpose of this study is to examine the relationship between ankle plantarflexion angle at initial contact (IC) and knee valgus angle and moment during single-leg landing. Twenty-two adults performed single-leg landings from a 0.3-m height. The ankle angle at IC was negatively correlated with pe...
This study investigates how individual characteristics differ between high and low biomechanical exposure lifters. Additionally, it asks if differences are related to control law formation as a determinant of movement strategy. While low exposure lifters had greater body mass and strength, neither f...
One of the fundamental motor deficits after stroke is abnormal coordinative patterns. However, it is still unclear underlying mechanisms of the motor deficit characteristic of stroke. Here, we investigated how stroke affects individual joint contributions to the abnormal coordinative patterns during...
Perception of knee healthy is important in return to physical activity after knee injuries. The association between the subjective measurements and objective markers of knee stress is important. Here we found a positive relationship between perception of knee health and impact forces on participants...
An understanding of deep hip muscle function in femoroacetabular impingement syndrome (FAIS) is needed to inform targeted treatment programs. This exploratory study compared activation patterns of the deep and superficial hip muscles during a step ascent task in individuals with FAIS (subgrouped by ...
Deletion of titin kinase form healthy skeletal muscle impairs the ability of the muscle to adapt to passive tension. The lack of sarcomereogenesis to abrogate passive tension indicates titin kinase plays an essential role in myocyte adaptations to stress.
Recently, we suggested that cross-bridge kinetics and residual force enhancement (RFE) contribute to the stretch-shortening cycle (SSC) effect. Cross-bridge kinetics and RFE are affected by fiber type. Therefore, we examined the influence of fiber type on the SSC effect and RFE. Rabbit psoas and sol...
High knee flexion postures (>120º) result in intersegmental contact of the lower limb. The purpose of this study was to quantify the effect of including 3D intersegmental contact on proximal tibia contact force estimations. Sixteen participants performed six high knee flexion postures while kinemat...
Golfers can modify the mass and moment of inertia (MoI) of their driver. The influence of these changes on golfers’ unique centre of pressure and centre of gravity movement patterns were investigated. The patterns between the control and High Mass condition showed small differences to the High MoI...
We aim to develop a more reliable paradigm in which to measure cortical voluntary activation (cVA) in nonimpaired and patient populations. Modulation of joint angle and paired pulse transcranial magnetic stimulation (ppTMS) were examined as means of improving the measurement of cVA due to their abil...
Some evidence suggests that plantarflexor muscle fascicles in older adults operate at shorter lengths further down the ascending limb of the length-tension curve than in young adults. This may restrict how volitional increases in activation, for example in gait retraining, propagate to larger ankle ...
Accurate measurement of temporal gait parameters is critical to provide valid estimates of running dynamics. Commercial sensors provide gait measures, but the algorithms used to produce these measures require validation and may be effected by individual differences in running style. This study aims ...
Older adults (OA) have challenges regulating stability during gait. This work sought to understand how aging influences anterior-posterior stability (AP), by examining ground reaction force (GRF) eccentricity generated by each limb. 28 younger-adults (YA)(18-31 years) and 28 OA(>65 years) completed ...
The findings from recent investigations have alluded to a greater reliance on visual information and processing in individuals following anterior cruciate ligament reconstruction (ACLR) during motor tasks involving the knee. The objective of this study was to determine how manipulation of visual inf...
This study compared the accuracy, precision and consistency of unilateral transtibial amputees (UTAs) stepping in to a floor-based target against able-bodied participants. UTAs exhibited reduced precision and consistency during the task, meaning they may find required changes in foot placement inher...
The rate of oxygen uptake (V̇O2) has been used to infer changes in metabolic rate with changes in EMG; however, V̇O2 is simply a proxy for the energy cost (EC) of exercise since the former does not account for substrate use. We compared the EMG/V̇O2 to the EMG/EC across different power outputs an...
Knee osteoarthritis decreases the ability to perform many daily activities such as walking. Thus, individuals adapt their initial movement strategy to compensate this deficit. One such compensatory strategy is to increase the foot progression angle. In order to study its impact on the lower limb joi...
The impact of knee laxity following total knee arthroplasty (TKA) on post-operative knee dynamics is not fully understood, and knee kinematics and kinetics likely influence patient perceptions, clinical performance, and component wear. The purpose of this study was to characterize intra-operative kn...
Asymmetry indices provide insights into walking mechanics in populations with unilateral deficiencies. The number of strides used in specific studies varies, and often there are equivocal outcomes for symmetry reported in the literature. Thus, it is worth understanding the influence of the number of...
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