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This work evaluated the effects of grip force magnitude and forearm muscle activity on wrist kinematics in response to sudden wrist perturbations. A haptic wrist robot delivered perturbations that caused wrist flexion, extension, radial and ulnar deviation. Prior to each perturbation, participants p...
Skeletal muscles are typically assumed to behave as single fibres scaled to larger sizes without considering the mechanical effects of greater tissue mass. While previous work has shown that larger muscle size and mass decreases the work and power output of contracting muscle, the metabolic conseque...
This study investigated the displacement within the Achilles tendon during running with traditional shoes, minimalistic shoes and barefoot. Displacement was calculated using ultrasound speckle tracking for three different portions in the tendon: deep, mid and superficial. The deep layer displaced si...
The aim of this study was to investigate the effects of tDCS on CMJ performance. In the real-tDCS condition, CMJ height increased by 3.15% and 2.14% at 0min and 30 mins separately compared to pre-test. The hip joint moment in real-tDCS condition was significantly larger than that of sham-tDCS condit...
Biomechanical factors are poor predictors of Anterior Cruciate Ligament (ACL) injury risk making the screening of athletes questionable [1]. However, these predictions are often based on a single parameter observed in a single task. This study aimed to determine if parameters measured across multipl...
The purpose of this study was to examine the shock attenuation of the initial peak vertical force and the rate of loading between barefoot, traditional bowling shoes with minimalist midsole design and modified bowling shoes with E-TPU midsole design. The results indicated that the bowling footwear w...
Dryfta is the all-in-one Event Management Platform for universities to manage their entire event from one place. Sell tickets. Collect abstracts. Engage attendees. Measure in-depth ROI. Achieve Event Success. Dryfta is Swedish for the English word, Discuss, and is pronounced Dr-eef-ta.
Exercise prescribed to treat osteoarthritis significantly improve grip strength, but it is unclear how they affect thumb specific forces. In this study, six weeks of hand exercise improved thumb force application in osteoarthritic (OA) and older healthy participants but not for the younger healthy p...
The objective of this study was to assess the impact of a self-lacing footwear system with three conditions of increasing lace tension (compared to a control basketball shoe) on foot containment by measuring foot-shoe motion during cutting using high speed stereo radiography (HSSR). Two shoes were e...
The biological ankle joint can change its stiffness in response to various locomotor tasks (e.g., load carriage), but the direct effect of ankle stiffness on metabolic power during various tasks is not fully understood. We evaluated the effect of ankle stiffness during load carrying tasks on metabol...
Clinical and experimental locomotor learning is often done on treadmills, which are commonly equipped with handrails. However, the effects of holding handrails on locomotor learning are unknown. Here we study the effects of handrail holding on split-belt adaptation in four groups: 1) Holding side-mo...
The purpose of this study was to further understand the role of plantar-surface sensation in modulating muscle activity. The additional of texture to orthotics served as a mechanism to manipulate mechanoreceptors in the sole of foot. The study divided the plantar foot surface into 5 distinct areas. ...
It can be difficult for young children to remain focused and avoid fidgeting during postural sway tests of 30 s or longer. The purpose of this study was to evaluate the construct and concurrent validity of sway measures recorded for durations less than 30 s. We measured the CoP RMS error of standing...
The purpose of this study was to examine the effects of upper body posture on shoulder muscle activity and kinematics during shoulder exercises using TheraBand® elastic resistance. 12 healthy individuals performed 4 shoulder exercises using a TheraBand® CLX: 1) unilateral flexion to 90 degrees, 2)...
Efficiency plateaus during incline walking at slopes above 20%, and is equal to that of concentric muscle activity. We believe that a non-linear increase in leg swing naturally results in the necessary increase in knee angle at heel strike to lift the body as slope increases and minimizes leg swing ...
The purpose of this study was to examine the effectiveness of different aquatic activity instructional methods for autistic children for motor skills development. Autistic children were evaluated over a three-week period of swim lessons between an upper extremity instructional method vs a lower extr...
Tai Chi has demonstrated its effectiveness for improving the postural stability of older adults and high fall risk individuals. The effects of Tai Chi on the postural stability of healthy young adults, however, have yet to be investigated. The present pilot study aimed to fill this gap. The pre-/pos...
Joint overloading has been historically implicated in the comorbid association between osteoarthritis (OA) and obesity. However, findings in obese mice and humans strongly suggest that load-independent systemic and joint inflammation are lynchpin drivers of joint degeneration. New evidence suggests ...
The purpose of the present investigation was to examine the influence of footwear on walking stability. Twenty healthy women walked at 1.3 m/s on an instrumented treadmill. One hundred steps (50-right, 50-left) were analyzed from two walking conditions (shod, unshod). The variability of the centre o...
The effect of infant positioning on the neck, back and lower limb muscle activity (2-6 months) was explored. Surface EMG data while lying prone was compared to lying supine, held in arms, in a baby carrier, and in a car seat. Infants exhibited significantly lower muscle activity in the car seat, com...
The purpose of this study was to determine the detrimental effects of a high-fat/high-sucrose (HFS) diet on muscle integrity and the contractile properties of single myofibers, and whether prebiotic fibre supplementation (PFS) and moderate aerobic exercise can mitigate these detrimental effects. HFS...
MR images of the distal upper limb of four participants were obtained. Participants were braced in 3 different wrist postures (radial deviation, neutral, ulnar deviation), in combination with 3 forearm postures (pronation, mid, supination). The flexor digitorum superficialis (FDS2) and profundus (FD...
Residual torque depression (rTD) is the decrease in isometric torque following active shortening of skeletal muscle, compared to a purely isometric contraction performed at the same muscle length and level of activation. This study investigated performance fatigability in males and females during pu...
PURPOSE: To determine whether compression garments are more effective in facilitating recovery. METHODS: 15 male college student participated in this study. The subjects performed experimental trials with a compression garment (CG) or without a CG (CON) during the recovery period after the deep squa...
The human foot arch has been suggested to store and release elastic energy during locomotion. However, experimental evidence for this assumption during jumping is missing. Thus, the relationship between the maximum deformation of the arch and jump height during countermovement jumps was investigated...
The Rapid Office Strain Assessment has proven to successfully quantify and reduce the risk of musculoskeletal disorders in office workers. However, since its development, many changes to typical office workstations have occurred as technology has advanced. This study incorporated those changes into ...
Mild fatigue during activities of daily living may have a greater impact on muscle function in older versus younger adults. Multi-muscle pattern (MMP) analysis was performed combining a wavelet transform and principal component analysis (PCA) to discriminate contributions of principal patterns (PP) ...
We used a haptic device to measure the influence of prosthesis type and feedback type (visual, vibration, force) on performance during a grasp-width matching task in five upper limb (UL) prosthesis users. All forms of feedback improved performance over the no feedback condition for each limb type. H...
The helical axes of motion for the proximal carpal bones were calculated using three-dimensional carpal position data from 10 subjects with varying degrees of wrist laxity. During mid-range wrist ulnar deviation, the triquetrum ulnar-deviated as the scaphoid and lunate extended. We found that with d...
Surrogates for pronation, such as the longitudinal arch angle (LAA), the rear foot angle (γ), the Achilles tendon angle (β) and the Foot Posture Index (FPI-6), are often quantified. To date, it is unknown whether the FPI-6 is an appropriate proxy for the LAA, γ or β, and also, whether any of the...
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