Search results for "orthopedic"

Impact loading history modulates hip fracture load and location : A finite element simulation study of the proximal femur in female athletes

2018

Sideways falls impose high stress on the thin superolateral cortical bone of the femoral neck, the region regarded as a fracture-prone region of the hip. Exercise training is a natural mode of mechanical loading to make bone more robust. Exercise-induced adaptation of cortical bone along the femoral neck has been previously demonstrated. However, it is unknown whether this adaption modulates hip fracture behavior. The purpose of this study was to investigate the influence of specific exercise loading history on fall-induced hip fracture behavior by estimating fracture load and location with proximal femur finite element (FE) models created from magnetic resonance images (MRI) of 111 women w…

The use of accelerometry to evaluate the BMX cycling starting hill. Effect of the Q-Ring™ on the acceleration profile

2020

Accelerometers are becoming popular in sport performance, as they are easy to wear, affordable, and usable in the field. Eccentric chainrings have been commercialised to improve pedalling performance, but little is known about their possible effects in the first pedal strokes (PS) of maximal sprint starts. To analyse the effects of the Q-Ring chainring (Q) on pedalling mechanics and performance in the BMX starting hill, 12 Spanish-National-Team BMX athletes performed 3 maximal sprints comparing Q vs No-Q. Time was measured in the first three meters. Acceleration output was registered with a triaxial 6 g accelerometer (200 Hz) in the first four PS. Discrete time, acceleration and statistical…

Dynamic Response of a Rigital Displacement Motor Operating with Various Displacement Strategies

2019

Digital displacement technology has the potential of revolutionizing the performance of hydraulic piston pumps and motors. Instead of connecting each cylinder chamber to high and low pressure in conjunction with the shaft position, two electrically-controlled on/off valves are connected to each chamber. This allows for individual cylinder chamber control. Variable displacement can be achieved by using different displacement strategies, like for example the full stroke, partial stroke, or sequential partial stroke displacement strategy. Each displacement strategy has its transient and steady-state characteristics. This paper provides a detailed simulation analysis of the transient and steady…

Algorithmic Approach for Slot Filling Factors Determination in Electrical Machines

2018

In several industrial sectors, such as electric and hybrid traction, the demand for increasingly efficient and high power density electrical machines has grown considerably over the last few years. The improvement of slot filling factor of the electrical machines is an useful provision to satisfy this request. In particular, this topic has been the subject of interest for the industrial sector in recent years, since the technology of winding processes have evolved and allow an economically sustainable realization of windings with an ordered structure rather than randomly. The winding phase must be supported by an accurate design process in which it is possible to evaluate the maximum slot f…

Debate of Ideas and Understanding With Regard to Tactical Learning in Team Sports

2021

Purpose: The researchers discuss the debate of ideas (DoI) and student understanding conducted on questioning and student answers or discussions in game-based approaches and on DoI as used in the tactical-decision learning model.Literature Review: Literature regarding types of questions and expected student answers and questioning for learning in game-based approaches is reviewed. In addition, a brief overview of the context in which DoI was originally developed is presented.Findings and Discussion: Studies that used DoI are discussed with regard to the management of game play and observation, DoI content and the dynamics of student discussions, and impact on game play statistics and on stu…

The inside out forehand as a tactical pattern in men’s professional tennis

2017

AbstractThe so-called inside out forehand has an active role in the baseline strategy because it offers the players new possibilities of hitting the incoming ball with their preferred shot by covering their weaker side and, at the same time, playing the ball with more open angles and directions which create more aggressive patterns of play. The purpose of this study is to analyse the use of this shot as well as its incidence on the men’s professional game both, right- and left-handed players. Eighteen matches corresponding to Grand Slam and ATP finals played between 2011 and 2014 were analysed. Eleven players (men) with ATP rankings between 1 and 14 were studied. Data show that the inside o…

Participation and performance trends in ultra-triathlons from 1985 to 2009

2010

We examined the changes in participation and performance trends in ultra-triathlons, from the Double Iron (7.6 km swimming, 360 km cycling, 84.4 km running) to the Deca Iron (38 km swimming, 1800 km cycling, 422 km running), between 1985 (first year of a Double Iron) and 2009 (25 years). The mean finish rate for all distances and races was 75.8%. Women accounted for ∼8-10% of the ultra-triathlons starters. For Double and Triple Iron, the number of finishers per year increased, from 17 to 98 and from 7 to 41, respectively. In the Deca Iron, the finishers per race have remained <20 since the first event was held, up to 2009. Concerning World best performances, the men were ∼19% faster than th…

A Self-Determined Exploration of Adolescents’ and Parents’ Experiences Derived From a Multidimensional School-Based Physical Activity Intervention

2022

Purpose: Adolescents’ and parents’ experiences within a multidimensional school-based physical activity intervention grounded on self-determination theory were explored. Method: Qualitative data from 29 adolescents (aged 15–17 years) and three parents on behalf of the total students’ families were collected via participant observation (research diary), semistructured interviews, and focus groups. Results: Adolescents perceived that the application of motivational strategies, based on self-determination theory, satisfied their basic psychological needs for autonomy, competence and relatedness, favored self-determined motivation, and gave rise to adaptive consequences (improved physical activ…

Response to letter to the editor by T. D. Noakes

2011

Le sommeil de l’adolescent obèse est-il différent de celui de l’adolescent sportif normo-pondéré ?

2018

Introduction L’obesite est associee a une alteration de la quantite et de la qualite du sommeil, en raison notamment d’un syndrome d’apnees obstructives du sommeil (SAOS) tandis que l’exercice physique (EP) ameliore ces parametres. Chez l’adolescent, une relation inverse entre sommeil paradoxal (SP) et exces de poids est aussi rapportee [1] . Les objectifs de cette etude sont de comparer le sommeil de l’adolescent obese (OB, IMC > 30 kg.m−2) a celui de l’adolescent sportif (SPO, EP ≥ 6 h/semaine) par polysomnographie, et d’evaluer l’impact du SAOS sur l’architecture du sommeil de l’OB. Materiel et methodes Trente-deux adolescents (22 OB : 14,9 ans, IMC = 40,2 kg.m−2 ; 12 SP : 15,7 ans, IMC …