Abstract According to the force-length-velocity relationships, muscle force potential during locomotion is determined by operating fibre length and velocity. We measured fascicle muscle-tendon unit velocity as well activity of human vastus lateralis (VL) walking running. Furthermore, we VL force-length relationship experimentally calculated force-velocity potentials (i.e. fraction maximum according curves) for both gaits. During active state stance phase, fascicles showed significantly (p...

Abstract The present study investigated the longitudinal growth of vastus lateralis (VL) muscle using four eccentric exercise protocols with different mechanical stimuli by modifying load magnitude, lengthening velocity and length at which is applied. Thirty-one participants voluntarily participated in this two experimental (EG) one control group (CG). first EG (n=10) exercised knee extensors leg 65% (low magnitude) maximum isometric voluntary contraction (MVC) second 100% MVC (high 90°/s...

Although symmetry of A chilles tendon ( AT ) properties between legs is commonly assumed in research and clinical settings, different loading profiles both daily life (i.e., foot dominance) may affect the a side‐depended manner. Therefore, were examined with regard to legs. Thirty‐six male healthy adults (28 ± 4 years), who physically active but not involved sports featuring dissimilar leg load participated. Mechanical morphological non‐dominant dominant measured by means ultrasound,...

Humans achieve greater jump height during a counter-movement (CMJ) than in squat (SJ). However, the crucial difference is mean mechanical power output propulsion phase, which could be determined by intrinsic neuro-muscular mechanisms for production. We measured M. vastus lateralis (VL) fascicle length changes and activation patterns assessed force–length, force–velocity power–velocity potentials jumps. Compared with SJ, VL fascicles operated on more favourable portion of force–length curve...

With the double stimulus of mechanical loading and maturation acting on muscle-tendon unit, adolescent athletes might be at increased risk developing imbalances muscle strength tendon properties. This longitudinal study aims to provide detailed information how athletic training affects time course adaptation during adolescence. In 12 elite (A) 8 similar-aged controls (C), knee extensor patellar properties were measured over 1 yr in 3-mo intervals. A linear mixed-effects model was used...

The aim of this study was the validation player and ball position measurements Kinexon’s local positioning system (LPS) in handball football. Eight athletes conducted a sport-specific course (SSC) small sided football games (SSG), simultaneously tracked by LPS an infrared camera-based motion capture as reference system. Furthermore, shots throws were performed to evaluate tracking. root mean square error (RMSE) for tracking 9 cm SSCs, instantaneous peak speed showed percentage deviation from...

Optimal control simulations of musculoskeletal models can be used to reconstruct motions measured with optical motion capture estimate joint and muscle kinematics kinetics. These are mutually dynamically consistent, in contrast traditional inverse methods. Commonly, optimal generated by tracking generalized coordinates combination ground reaction forces. The estimated from marker positions using, for example, kinematics. Hence, inaccuracies the tracked simulation. We developed an approach...

Aims The aim of this study was to examine the acute effects dynamic stretching (DS) exercise on passive ankle range motion (RoM), resting localized muscle stiffness, as measured by shear wave speed (SWS) medial gastrocnemius muscle, fascicle strain, and thickness. Methods/Results Twenty-three participants performed a DS protocol. Before after stretching, SWS in belly (MGM) using elastography. produced small improvements maximum dorsiflexion (+1.5° ±1.5; mean difference ±90% confidence...

Imbalances of muscle strength and tendon stiffness may increase the risk for patellar tendinopathy in growing athletes. The present study investigated if a functional high-load exercise intervention, designed to facilitate adaptation reduce muscle-tendon imbalances, prevent pain adolescent male handball players (12–14 years). Tendon prevalence (using VISA-P scores), knee extensor strength, vastus lateralis (VL) architecture mechanical properties were measured at four measurement time points...

It is believed that hormonal changes during pregnancy lead to an increased compliance in ligaments and tendons, increasing the risk suffer from connective tissue injuries particularly exercise. While laxity of pelvic may increase facilitate childbirth, our knowledge no study has ever investigated mechanical properties human tendons different stages pregnancy. Thus, purpose longitudinal was investigate patellar tendon postpartum. Nineteen pregnant women (30 ± 4 years) 11 non-pregnant controls...

Digital Contact Tracing (CT) protocols based on Bluetooth are best implemented at the system level to save resources and preserve security aspects. Combined with a government-monitored software platform, these CT-protocols can then be used support controlling pandemics such as COVID-19. However, it is unclear how have parameterized ensure most accurate reliable CT.This paper describes we derived optimal parameters for decentralized CT from extensive measurement campaigns that carried out...

While the incidence of falls has been described to increase with pregnancy, mechanism behind this is unclear. Pregnancy associated changes in lower extremity muscle strength could be a possible factor influencing injury risk. Thus, aim longitudinal study was investigate and architectural properties limbs different stages pregnancy postpartum. In nineteen pregnant women (30±4years) fifteen non-pregnant controls (28±4years) vastus lateralis were assessed combining dynamometry, ultrasound,...

This work proposes metric learning for fast similarity-based scene retrieval of unstructured ensembles trajectory data from large databases. We present a novel representation approach using Siamese Metric Learning that approximates distance preserving low-dimensional and learns to estimate reasonable solutions the assignment problem. To this end, we employ Temporal Convolutional Network architecture extend with gating mechanism enable sparse data, leading problem exhibiting varying degrees...

Eccentric loading is an effective stimulus for muscle hypertrophy and strength gains, however, the effect of lengthening velocity under debate. The purpose current study was to investigate influence during eccentric training on gains at a given overall volume. Forty-seven participants were randomly assigned control (n = 14, age: 26.9 ± 4.1 years) experimental group 33, 27.1 4.4 years). Each leg in one four protocols with different angular velocities (i.e., 45, 120, 210, 300°/s). Both...

Our purpose was to examine the Hoffmann reflex (H-reflex) during balance recovery after a simulated forward fall from 2 different inclination angles.The soleus H-reflex of 15 healthy adults measured in leaning positions (exerting horizontal force at 15% and 30% body weight, respectively), with no release (Int0) intervals (Int1, Int2) (∼45 ∼65 ms, respectively).During Int2, H-reflex, which evoked before onset electromyography, significantly higher than induced 20 ms earlier (Int1). No...