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Uneven terrain causes fluctuations in walking speed. Some fluctuations follow the physical height change of each step, but humans might also actively adjust their speed in anticipation of upcoming terrain [1]. Simultaneity makes these two effects difficult to separate, but speed fluctuations over a ...
Dynamic in vivo tracking of foot bone motion is challenging due to occlusions of the many small, close-packed bones. In this study, we investigated image resolution of dynamic biplanar videoradiography data and whether it affects the performance of bone tracking when using CT-derived models. Downsam...
Current strength training interventions post-stroke appear to provide limited benefits to improving gait function. One potential reason is the focus on muscle groups that provide small contributions to propulsion during gait. This study aimed to determine the impact of muscle strength and balance on...
The importance of working technique to prevent low back injuries remains unknown. Simulating a manual material handling task, we found that individual factors and working technique explain 64% and 48% of the variance in cumulative moments at L5/S1 joint.
The sarcomere force-length (FL) relationship can be derived theoretically using thick and thin filament lengths. Here, we determined the mean sarcomere FL curve using directly- measured sarcomere lengths (SL) and muscle forces in an intact muscle and compared it to the theoretical FL curve. Tibialis...
The force length relation (f-l-r) of the gastrocnemius medialis (GM) was assessed at extreme dorsiflexed positions using ultrasound, motion capture, electromyography (EMG) and dynamometry. Thereby, the beginning of the descending limb of the f-l-r was experimentally shown, allowing the determination...
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 ...
The aim of this study was to investigate the capacity of foot-worn inertial and magnetic sensors to detect hurdle crossings and provide a detailed spatiotemporal running analysis of a 400 meters hurdling race. The results showed that the flight phase duration combined with the foot orientation or wi...
The study successfully developed and validated an automated identification of autistic postural control patterns using a machine learning approach. In general, simpler machine learning algorithms displayed higher accuracy rates compared to more complicated ones. The use of machine learning may provi...
Sports-related concussion (SRC) and concurrent neck pain (NP) is one of the most common and serious injuries in the United States. Prevention strategies to target modifiable intrinsic risk/protective factors are lacking. From a joint stability perspective, it is of interest to examine whether neck m...
Spatiotemporal gait asymmetries are a common feature of walking post-stroke. Although reducing asymmetry is a common objective of rehabilitation, the functional benefits of improving symmetry are not well understood. Here, we determined how manipulation of step length asymmetry influenced dynamic ba...
In order to analyze the golf swing, it is necessary to judge the point of the backswing top and the impact, and to divide the swing section. In this study, we propose a method that estimates each point in golf swing using only single sensor at various parts of the body and compares it with the most ...
Hip fracture is a common health risk among elderly people worldwide. Sideways or lateral fall has been identified as the most critical situation for the elderly to develop a hip fracture, since the hip is normally covered with a thin layer of soft-tissue that is inadequate to attenuate the impact fo...
Aged or knee osteoarthritis gait is commonly assessed via optical motion capture (MoCap). However, tracking changes or identifying deficits in gait in the real-world setting is difficult to accomplish with MoCap. In this study, we tested the ability of inertial measurement units (IMUs) to capture ga...
The in vivo elongation patterns of the medial (MCL) and lateral (LCL) collateral ligaments following total knee arthroplasty (TKA) were investigated during level walking and squatting using moving video fluoroscopy and subject-specific modelling. Furthermore, a Monte Carlo analysis revealed the in v...
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...
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...
Using maximum height squat jumping as an example task, it was shown that optimization of neural inputs to a largish-scale musculoskeletal model in which the actuators are represented by Huxley-type muscles, results in macroscopic behaviour similar to that of an otherwise identical model with Hill-ty...
Subject-specific shoulder joint models can be used as clinical tools in pre-surgery planning as well as post-surgery rehabilitation domains. We performed a comparison of muscle mechanics between shoulder joint models that have generic and subject-specific muscle insertions. Ten healthy cadaveric sho...
The objective of our study was to study the impact of a gripping aid on the kinematics and the functional motor capacities of the hand, in healthy subjects. Our hypothesis was that this spherical device could stabilize the first commissure of the hand and induce kinematic changes. A sample of 19 hea...
Recent studies demonstrated that transverse loading (FG) of a muscle resulted in a considerable reduction of maximum isometric muscle force (ΔFim). Here we tested if a Hill-type muscle model assuming an identical gearing G between both ΔFim and FG as well as lifting height of the load (Δh) and lo...
In order to ascertain the significance of spine stability in holding the upright-standing posture after focal muscular disuse atrophy, two optimization-driven approaches were employed to develop kinematics-driven (KD), and stability-based kinematics-driven (SKD) musculoskeletal (MS) models of an adu...
Mini tightrope suspensionplasty is a surgery performed to reduce pain and improve function in individuals with arthritis of the thumb joint. The goal of this work was to determine and develop a 3D visualization that demonstrated changes due to this surgery. Post-surgery, thumb forces increased by 66...
The purpose was to compare muscle and hip contact forces (HCF) during gait in FAI patients pre- and post-surgery. Hip kinematics and kinetics were computed and muscle and HCF were estimated using musculoskeletal modelling. FAI patients showed significant improvement scores in reported outcomes, redu...
A real-time dynamic MR sequence (acquisition time=10.5sec) was used to evaluate the in vivo finger biomechanical parameters during motion on ten healthy volunteers. Joint angle and moment arm of flexor digitorum profundus tendon were measured on the acquired images during motion at metacarpo-phalang...
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...
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 ...
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