State of knowledge and current practices regarding concussion prevention and management: a survey among >2000 Frenchspeaking stakeholders

peer reviewe

Document, create and translate knowledge: the mission of ReFORM, the Francophone IOC Research Centre for Prevention of Injury and Protection of Athlete Health

The International Olympic Committee (IOC) has supported athletes’ health protection by funding Research Centres dedicated to prevention and treatment of sports-related injuries and illnesses. After establishing four centres in 2009, the IOC Research Centres network expanded to 9 Institutions in 2014 and the 2019 round recognised 11 centres. Here we introduce ReFORM — an international French-speaking network of five institutions.Peer reviewe

Projet RouVéCom: Système de communications entre véhicules et véhicules infrastructures

National audienc

Projet RouVéCom : Etude et Réalisation d'une antenne à balayage électronique pour communications entre véhicules et entre véhicules et routes

National audienc

A 360 Beam Switching Monopole Antenna For Automative Radar

International audienc

Effectiveness of the hypoxic exercise test to predict altitude illness and performance at moderate altitude in high‐level swimmers

International audiencePurposeThe hypoxic exercise test is used to predict the susceptibility to severe High Altitude Illness (SHAI). In the present study, we aimed to use this test to predict the changes in performance and the physiological responses to moderate altitude in elite swimmers.MethodsEighteen elite swimmers performed a hypoxic exercise test at sea level before a moderate 12-day altitude training camp (1,850 m) to determine if they were susceptible or not to SHAI. A maximal swimming performance test was conducted before (at sea level), during (at 1,850 m), and after (at sea level) the intervention. Arterial oxygen saturation (pulse oximetry), Lake Louise score, and quality of sleep questionnaire were collected every morning. The participants were classified in two groups, those who had a moderate to high risk of SHAI (SHAIscore ≥ 3) and those who had a low risk of SHAI (SHAIscore ResultsSeven swimmers presented a high risk of SHAI including three of them with a SHAIscore > 5. Pearson correlations indicated that SHAIscore was strongly correlated with the decrease in swimming performance at altitude (r = .60, p .1).ConclusionIn a population of elite swimmers, the combination of clinical and physiological variables (SHAIscore, oxygen desaturation) estimated the performance decrease at moderate altitude. The hypoxic exercise test could allow coaches and scientists to better determine the individual response of their athletes and manage the altitude acclimatization

Automating Generation of Kinematic Keypoints for Disassembly Process toward Virtual Reality

International audienceThis paper describes a novel approach to generate and model assemblysemantic meaning enclosed in product assembly features in order to optimize thepreparation time of Virtual Reality simulations. The proposed approach is basedon a set of heuristic rules to generate semantic KeyPoints (characterisation of akinematic link or a mates) used to idealize an assembly model. This study iden-tifies through a disassembly process a number of semantic rules in order to extractand translate assembly semantic features from CAD models. The proposed ap-proach is based on two steps: features extraction and semantic recognition of theassembly features. In the first step, internal boundary representation (B-Rep) andmate extraction methods are used to retrieve the engineering meaning from as-sembly models using SolidWorks’ API functions. In the second step, a multi-level semantic rules model is used. The approach is demonstrated and validatedon a use-case with a disassembly process scenario and adapted to Virtual Reality

L’acclimatation active à la chaleur n’altère pas les propriétés de l'unité muscle-tendon

International audiencePurpose Heat acclimation (HA) is recommended before competing in hot and humid conditions. HA has also been recently suggested to increase muscle strength, but its effects on human’s muscle and tendon mechanical properties are not yet fully understood. This study investigated the effect of active HA on gastrocnemius medialis (GM) muscle–tendon properties. Methods Thirty recreationally active participants performed 13 low-intensity cycling sessions, distributed over a 17-d period in hot (HA = ~38°C, ~58% relative humidity; n = 15) or in temperate environment (CON = ~23°C, ~35% relative humidity; n = 15). Mechanical data and high-frame rate ultrasound images were collected during electrically evoked and voluntary contractions pre- and postintervention. Shear modulus was measured at rest in GM, and vertical jump performance was assessed. Results Core temperature decreased from the first to the last session in HA (−0.4°C ± 0.3°C; P = 0.015), while sweat rate increased (+0.4 ± 0.3 L·h −1 ; P = 0.010), suggesting effective HA, whereas no changes were observed in CON (both P ≥ 0.877). Heart rate was higher in HA versus CON and decreased throughout intervention in groups (both P ≤ 0.008), without an interaction effect ( P = 0.733). Muscle–tendon unit properties (i.e., maximal and explosive isometric torque production, contractile properties, voluntary activation, joint and fascicular force–velocity relationship, passive muscle, and active tendon stiffness) and vertical jump performance did not show training ( P ≥ 0.067) or group–training interaction ( P ≥ 0.232) effects. Conclusions Effective active HA does not alter muscle–tendon properties. Preparing hot and humid conditions with active HA can be envisaged in all sporting disciplines without the risk of impairing muscle performance