Occupations funéraires et domestiques du haut Moyen Âge à nos jours en périphérie d’une ancienne église paroissiale sur le site de « La Chapelle Sainte-Cécile » à Flée (Sarthe)

Le site de « La chapelle Sainte-Cécile » se situe sur le territoire de la commune de Flée, au sud-est du département de la Sarthe (fig. 1). Fig. 1 ­– Localisation et environnement du site de « La Chapelle Sainte-Cécile », données de la carte archéologique du SRA Pays de la Loire (DAO A. Guicheteau). C’est dans le cadre de la prolongation d’un travail de master, effectué en 2007-2008 sur le peuplement aux marges de la forêt de Bercé au Moyen Âge, que le site a été choisi pour faire l’objet de..

Accuracy and kinematics consistency of marker-based scaling approaches on a lower limb model: a comparative study with imagery data

Medical images are not typically included in protocol of motion laboratories. Thus, accurate scaling of musculoskeletal models from optoelectronic data are important for any biomechanical analysis. The aim of the current study was to identify a scaling method based on optoelectronic data, inspired from literature, which could offer the best trade-off between accurate geometrical parameters (segment lengths, orientation of joint axes, marker coordinates) and consistent inverse kinematics outputs (kinematic error, joint angles). The methods were applied on 26 subjects and assessed with medical imagery building EOS-based models, considered as a reference. The main contribution of this paper is to show that the marker-based scaling followed by an optimisation of orientation joint axes and markers local coordinates, gives the most consistent scaling and joint angles with EOS-based models. Thus, when a non-invasive mean with an optoelectronic system is considered, a marker-based scaling is preliminary needed to get accurate segment lengths and to optimise joint axes and marker local coordinates to reduce kinematic errors.AbbrevationsAJCAnkle joint centreCKEcumulative kinematic errorDoFdegree of freedomEBEOS-basedHBheight-basedHJChip joint centreKJCknee joint centreMBmarker-basedMSMmusculoskeletal modelsSPMstatistical parametric mappingSTAsoft tissue artifactEBa.m∗EOS-based with optimised joint axes, and all model markers coordinatesMBa.m∗marker-based with optimised joint axes, and all model markers coordinatesMBl.a.mmarker-based with optimised segment lengths, joint axes, and selected model markers coordinatesASISanterior superior illiac spine PSIS posterior superior illiac spine

Shoulder rotators electro-mechanical properties change with intensive volleyball practice : a pilot study

International audienceThis pilot study was designed to assess the incidence of high-level volleyball practice on muscle strength production and muscle activation during internal and external shoulder rotations. Seven professional and seven French amateur league volleyball players performed maximal isometric at three forearm angles, concentric and eccentric isokinetic internal and external shoulder rotations. The torque production and muscle activation levels of PECTORALIS MAJOR and INFRASPINATUS were determined. Few significant differences were found for muscle activation and co-activation between amateur and professional volleyball players during both internal and external rotations. No significant difference in torque production was observed for shoulder internal rotation between professional and amateur volleyball players. Torque production was significantly higher during shoulder external rotation for amateur (46.58+/-2.62 N . m) compared to professional (35.35+/-1.17 N . m) volleyball players relative to isometric contractions, but it was not different during isokinetic efforts. The torque ratios for external/internal rotations were always significantly lower for professional (0.42+/-0.03 pooling isometric and concentric conditions) compared to amateur volleyball players (0.56+/-0.03 pooling isometric and concentric conditions). Those results emphasize that a high level of volleyball practice induces a strong external rotators deficit compared to sports such as swimming, baseball or tennis

In situ evaluation of the cushioning characteristics of different sport shoe midsoles

International audienceThe capacity of sport shoe midsoles to attenuate impact during ground contact has been largely studied for activities such as walking and running. However, shoe midsoles have also a key impact in more jumping and landing sports like volleyball or basketball for example. Only few data are available concerning shock transmission and reduction throughout this kind of activities. The aim of this study is to compare three sport shoe midsole capacities during different dynamical tasks (Squat Jump, Drop Jump and Landing Test). We analyzed the cushionning capacities of midsoles in three different footwear conditions by comparing dynamical data from a Pedar System (foot/midsole forces) and from a force plate (midsole/ground forces). The results showed that sport shoe midsoles have different dynamical absorption capacities at the backfoot during leaving the ground and landing phases (

Automatic Swimming Activity Recognition and Lap Time Assessment Based on a Single IMU: A Deep Learning Approach

International audienceThis study presents a deep learning model devoted to the analysis of swimming using a single Inertial Measurement Unit (IMU) attached to the sacrum. Gyroscope and accelerometer data were collected from 35 swimmers with various expertise levels during a protocol including the four swimming techniques. The proposed methodology took high inter- and intra-swimmer variability into account and was set up for the purpose of predicting eight swimming classes (the four swimming techniques, rest, wallpush, underwater, and turns) at four swimming velocities ranging from low to maximal. The overall F1-score of classification reached 0.96 with a temporal precision of 0.02 s. Lap times were directly computed from the classifier thanks to a high temporal precision and validated against a video gold standard. The mean absolute percentage error (MAPE) for this model against the video was 1.15%, 1%, and 4.07%, respectively, for starting lap times, middle lap times, and ending lap times. This model is a first step toward a powerful training assistant able to analyze swimmers with various levels of expertise in the context of in situ training monitoring

Occupations funéraires et domestiques du haut Moyen Âge à nos jours en périphérie d’une ancienne église paroissiale sur le site de « La Chapelle Sainte-Cécile » à Flée (Sarthe)

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Review on bioorganometallic chemistry and new outcomes in the synthesis and substitution of tetracarbonyl(pyrrolylimine) complexes of rhenium with organophosphorus ligands

International audienceAfter a short review dealing with bioorganometallic chemistry, the synthesis of tetracarbonyl( pyrrolylimine) complexes of rhenium bearing chirality on the pyrrolyl ligands was reported. The reactivity of these compounds towards the substitution of one carbonyl ligand with triphenyl phosphine, tricyclohexyl phosphine and trimethyl phosphite was studied. The rhenium becoming a stereogenic center in that transformation, the resulting tricarbonyl species were obtained as mixtures of diastereomers, with diastereomeric excesses varying from 8 to 84%, according to the reaction conditions and the relative steric hindrances of the pyrrolylimine and the organophosphorus ligands. These bioorganometallics are potential CO releasing molecules that could be used in the field of medicinal chemistry

Ground Reaction Forces and Moments Prediction of Challenging Motions: Fencing Lunges

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