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The present study was aimed to investigate effects of kinematics of the knee and hip joints on energy cost during supporting phase in different slope running. Twelve male middle- and long-distance runners were asked to run for three minutes on a treadmill at the speed of 13.5 km/h under three differ...
Femoral neck strength was assessed in five cadaveric human femora (age ranging 27-80) using simulated lateral impacts with a test system aligned with a CSA test standard. Prior to testing, hip-specific DXA scans were obtained to extract femoral neck BMD. Simulated lateral impacts were performed with...
Plantar pressure during gait and plantar fascia shear modulus were assessed in participants with plantar fasciitis and active pain, and participants with a history of plantar fasciitis, but no current pain. There were moderate relationships between plantar pressure under the 1st MH and shear modulus...
The step length-step rate relationship in unilateral transfemoral amputee was investigated using linear regression analysis. The coefficient of determination of unaffected limb was significantly lower than able-bodied participant’s limb. Current results suggest that unilateral transfemoral amputee...
Total Knee Arthroplasty (TKA) procedures are prevalent throughout the United States [1]. Patients often experience dissatisfaction and asymmetric gait post-TKA. Seven TKA patients conducted walking trials on three different terrains as well as completed a satisfaction survey. Initial findings identi...
Within- and between-day reliability and minimal detectable differences for select knee joint angles measured during running were determined. Knee joint variables demonstrated good to excellent within- and between-day reliability.
We propose a damped harmonic oscillator model of the acceleration of the center of mass during a medial drop landing to measure dynamic stability in subjects with functional ankle instability. We found construct validity of the model to be good. The damping coefficient in the model significantly cor...
Flatfoot is a complex multi-plane deformity of the foot, but is often classified using planar foot prints. A novel foot sole scan system (FAST) enables fast measurement of the three-dimensional foot sole surface and thus relevant morphological parameters. The current study aimed to assess the intra-...
Residual force depression (rFD) and residual force enhancement (rFE) are intrinsic contractile properties of skeletal muscle. To date, there have been no investigations of rFD and rFE in human fibres. Thus, the purpose of this study was to determine whether rFD and rFE occur at the single muscle fib...
General methods to predict rate of recovery of Whiplash associated disorder (WAD) patients rely on subjective functional assessments. The Neck Functional Holistic Analysis Score (NFHAS) stages patients into 5 groups according to the severity of ROM loss. In a cohort of 904 patients, the NFHAS showed...
The rebound jump (RJ) is a mode of plyometric training that exploits a rapid cyclical muscle action known as the stretch-shortening cycle (SSC). Because landing from a rebound jump requires the athlete to modulate ground reaction forces of 3-14 times body weight, proper alignment and technique of th...
We previously reported that a longer knee extensor moment arm (MA) is associated with better sprint performance because of increase in knee extensor torque during sprinting. In contrast, a shorter MA is a useful in decreasing energy consumption in muscles, potentially by mitigating the length change...
This study investigated the relationship between ratio of vastus medialis (VM) to vastus lateralis (VL) muscle thickness and the knee valgus angle at initial contact during single-leg landing. Ultrasound images of VM and VL were obtained from thirteen healthy subjects. All subjects performed single-...
The purpose of this study was to determine the relationship between lean muscle volume of the thigh, calculated from MRI, and clinical mobility outcomes after accounting for thigh fatty tissue volume in women with knee osteoarthritis (OA). Secondarily, we aimed to quantify the relationship between l...
A transient period of accelerated relaxation occurs when mammalian muscle is repeatedly stimulated. We aimed to determine if a similar effect occurs during repetitive stimulation of frog plantaris muscle. The existence of this effect would provide insight into the mechanisms controlling the rate of ...
To study muscle adaptation mechanisms, e.g. during growth, ageing or disease, reliable measurements of muscle architecture are required. Diffusion tensor imaging (DTI), combined with DTI tractography, can provide three-dimensional reconstructions of the architecture of whole human muscles. Here, we ...
Panoramic ultrasound has been used to measure muscle morphology – an important biomechanical parameter. However, the validity of this measure has yet to be shown in the hamstrings. Our preliminary results suggest good to excellent reliability of ultrasound for multiple hamstring muscle-tendon morp...
Neck pain (NP) is one of the most common and disabling musculoskeletal conditions in the world and is more prevalent in females. As a part of clinical examination for individuals with NP, ultrasound (US)-based imaging biomarkers of the cervical muscles have been increasingly utilized: cross sectiona...
There are conflicting observations regarding residual force enhancement (RFE) in cardiac muscle. In this study, we intended to re-examine RFE in cardiac myofibrils. RFE was tested after active stretches from average sarcomere lengths of i) 1.8 to 2.0 µm (n = 8), and ii) 2.0 to 2.2 µm (n = 8). All ...
Motor units control muscle function and coordination. However, most experimental and modelling motor unit recruitment studies have investigated isometric contractions, which limits its applicability to human movement. We introduce a musculoskeletal simulation framework that reverse engineers the rec...
This study investigated the relationship between muscle composition and patient-reported pain in individuals with and without symptomatic or radiographic hip osteoarthritis (OA). Fatty infiltration of the hip abductor muscles was quantified and related to HOOS pain scores. Increased fatty infiltrati...
The purpose of this investigation was to examine a relationship between constraint of motion and motor output, in that use of an ipsilateral ankle foot orthosis-footwear combination maximizing constraint of ipsilateral ankle motion will minimize muscle activation. Our findings support a relationship...
Studying purpose was to assess the relation between trunk and foot COP at the cocking phase during pitching motion. Subjects were 22 healthy men. We measured using goniometer and electronic vernier caliper at the cocking posture the horizontal abduction angle of humeral articulation (HABD), scapula ...
Lower-limb amputees are at an increased risk for falls due to balance impairments and lack of sensory feedback. Dysvascular amputation is especially associated with a lack of sensory feedback from both limbs, although studies measuring balance impairments after amputation have primarily focused on t...
An accurate method to analyze shoulder kinematics in a clinical setting is needed in order to optimize treatment. The purpose of this study was to determine the reliability and accuracy of kinematics derived from 2D assessment of single plane fluoroscopy images compared to kinematics from 2D/3D shap...
Traditional methods to assess scapular position involve specific devices that may not be widely available to clinicians. In this way, the purpose of the study was to evaluate the reliability and validity of a smartphone clinometer application to assess scapular upward rotation, comparing the results...
Current assessments of pectus deformities use highly subjective, low precision calipers and may require exposure to ionizing radiation. This study demonstrates the high reliability of a low cost commercially available 3D scanning and custom measurement technique for non-invasive assessment of pectus...
The stride interval variability and complexity were analysed to gain insights into the development of running-related injuries. Yet, it remains unknown the reliability of the stride interval variability and complexity measured at different days and sides. The present study estimated the between-day ...
In this study, we tested for differences in torque, electromyographic activity (EMG), and the associated neuromuscular efficiency (NME) between isometric voluntary contractions of elbow flexors preceded and not preceded by a lengthening contraction. The dependence of such differences on (i) stretch ...
The aim of our literature review is to identify the gaps between research outputs, clinical practice, and daily behavior in the rising from a seated position movement of the elderly, and to outline future directions for research on this motion to address issues with an ageing population. A literatur...
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