Exploration of the effect of EEG Levels in experienced archers

This preliminary study aims to record the brainwaves of two experienced archers, whist undertaking the process of aiming and shooting arrows at a target. The brainwaves are then analysed for repeatability and dominant characteristics within individual EEG activity. Images of the archers are also recorded to establish reference points within the shot cycle for correlating the EEG data sets

Data collection by wireless technology ZigBee

Tato bakalářská práce se zabývá komunikačním standardem IEEE 802.15.4, bezdrátovou technologií ZigBee a zaměřuje se na její použití v oblasti hromadného sběru dat a telemetrie. Teoretickou část tvoří kapitoly popisující standard IEEE 802.15.4 a technologii ZigBee a kapitoly popisující návrh komunikační jednotky z pohledu obvodového řešení a implementaci firmwaru. Praktická část se týká samotné realizace komunikační jednotky pro sběr dat z měřícího přístroje. Je založená na popsaném řešení. Dále řeší návrh kostry systému v kterém by byla použita technologie ZigBee.This bachelor study deals with communication standard IEEE 802.15.4, wireless technology ZigBee and describes its using in collective data collection area and telemetry. Teoretical part is formed by some chapters which detailing standard IEEE 802.15.4 and ZigBee technology and some chapters which detailing communication unit design from look peripheral solving and implementation firmware. Practical part have to do with itself realization communication unit for data gathering from measuring devices. It is based on circumscribed solving. Further smoothing - out proposal frame system in which the would be used technology ZigBee.

Measuring unit of electric power quality

Tato diplomová práce popisuje parametry elektrické energie se zaměřením na nízkonapěťové charakteristiky a jejich měření s ohledem na parametry požadované normami. Dále se jedna kapitole zaobírá monitorováním kvality elektrické energie. Zmiňuje se zde organizace měření, výpočet kvality elektrické energie a sběr dát pro jej výpočet. Pro ilustraci je zmíněn a popsán jeden příklad distribuovaného systému monitorování z praxe. Druhá část práce se zabývá návrhem a realizací modulu pro měření kvality elektrické energie, konkrétně měřením napěťových charakteristik. Popisuje výběr zvoleného řešení, hardwarovou část a obslužný program MCU. Na zobrazení naměřených dát bol vytvořený programový nástroj v programovacím jazyku Java. Aplikace umožňuje vizualizaci měřeného průběhu napětí elektrické nízkonapěťové rozvodné sítě s jednofázovým napětím efektivní hodnotou 230V.This thesis describes the parameters of electrical energy with a focus on low voltage characteristics and their measurement with respect to the parameters required by standards. In addition, one chapter deals with monitoring of the quality electric energy. Measurement organizations, calculation of power quality and the data collection for its calculation is referred here. For the illustration, the example of a distributed monitoring system from practice is described. The second part deals with the design and implementation of a module for measuring power quality , namely by measuring the voltage characteristics. It describes the selection of the chosen solution, hardware part and firmware for the MCU. To display the measured data, application was created by the Java programming language. The application allows the visualization of the voltage measured Low voltage grid with single phase voltage RMS value 230.

Ag:TiN-Coated Polyurethane for Dry Biopotential Electrodes: From Polymer Plasma Interface Activation to the First EEG Measurements

Several plasma treatments using argon, oxygen, and nitrogen are studied in order to increase the interfacial adhesion of the polyurethane/Ag:TiN system to be used as biopotential electrodes. The optimized plasma treatments conditions (100 W, 15 min, regardless of the gas) promote a steep decrease of the water contact angle values. The observed chemical and topographic alterations translate into excellent polyurethane/Ag:TiN interfacial adhesion of the plasma treated samples. The in-service validation of the proposed Ag:TiN-coated PU multipin electrodes is performed by acquiring EEG signals in parallel with the standard wet Ag/AgCl electrodes. No considerable differences are found in terms of shape, amplitude, and spectral characteristics of the signals when comparing reference wet and dry electrodes.This research is partially sponsored by FEDER funds through the program COMPETE – Programa Operacional Factores de Competitividade and by national funds through FCT – Fundação para a Ciência e a Tecnologia, under the projects PEst-C/EME/UI0285/2011, PTDC/SAU-ENB/116850/2010, PTDC/CTM-NAN/112574/2009 and Programa Pessoa 2012/2013 Cooperação Portugal/França, Project no. 27306UA Porous architectures in GRAded CERamic thin films for biosensors - GRACER. The authors would also like to acknowledge CEMUP for SEM analysis and Yantai Wanhua Polyurethanes Co., Ltd for providing the thermoplastic polyurethane pellets. P. Pedrosa acknowledges FCT for the Ph.D. grant SFRH/BD/70035/2010. P. Fiedler acknowledges the German Federal Ministry of Education and Research project – 03IPT605A. P. Pedrosa and P. Fiedler both acknowledge FP7-People Marie Curie IAPP project 610950 (ANDREA) and German Academic Exchange Services for the Germany/Portugal bi-lateral project – D/57036536

COSMOS: the dialysis scenario of CKD-MBD in Europe

Background Chronic kidney disease-mineral and bone disorders (CKD-MBD) are important complications of CKD5D patients that are associated with mortality. Methods COSMOS is a multicentre, open cohort, prospective, observational 3-year study carried out in haemodialysis patients from 20 European countries during 2005-07. The present article describes the main characteristics of the European dialysis population, the current practice for the prevention, diagnosis and treatment of secondary hyperparathyroidism and the differences across different European regions. Results The haemodialysis population in Europe is an aged population (mean age 64.8 ± 14.2 years) with a high prevalence of diabetes (29.5%) and cardiovascular disease (76.0%), and 28.7% of patients have been on haemodialysis more than 5 years. Patients from the former Eastern countries are younger (59.3 ± 14.3 versus 66.0 ± 13.9), having a lower proportion of diabetics (24.1 versus 30.7%). There were relevant differences in the frequency of measurement of the main CKD-MBD biochemical parameters [Ca, P and parathyroid hormone (PTH)] and the Eastern countries showed a poorer control of these biochemical parameters (K/DOQI and K/DIGO targets). Overall, 48.0% of the haemodialysis patients received active vitamin D treatment. Calcitriol use doubled that of alfacalcidiol in the Mediterranean countries, whereas the opposite was found in the non-Mediterranean countries. The criteria followed to perform parathyroidectomy were different across Europe. In the Mediterranean countries, the level of serum PTH considered to perform parathyroidectomy was higher than in non-Mediterranean countries; as a result, in the latter, more parathyroidectomies were performed in the year previous to inclusion to COSMOS. Conclusions The COSMOS baseline results show important differences across Europe in the management of CKD-MB

An approach to emotion recognition in single-channel EEG signals: a mother child interaction

In this work, we perform a first approach to emotion recognition from EEG single channel signals extracted in four (4) mother-child dyads experiment in developmental psychology -- Single channel EEG signals are analyzed and processed using several window sizes by performing a statistical analysis over features in the time and frequency domains -- Finally, a neural network obtained an average accuracy rate of 99% of classification in two emotional states such as happiness and sadness20th Argentinean Bioengineering Society Congress, SABI 2015 (XX Congreso Argentino de Bioingeniería y IX Jornadas de Ingeniería Clínica)28–30 October 2015, San Nicolás de los Arroyos, Argentin

Measuring mental workload with EEG+fNIRS

We studied the capability of a Hybrid functional neuroimaging technique to quantify human mental workload (MWL). We have used electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) as imaging modalities with 17 healthy subjects performing the letter n-back task, a standard experimental paradigm related to working memory (WM). The level of MWL was parametrically changed by variation of n from 0 to 3. Nineteen EEG channels were covering the whole-head and 19 fNIRS channels were located on the forehead to cover the most dominant brain region involved in WM. Grand block averaging of recorded signals revealed specific behaviors of oxygenated-hemoglobin level during changes in the level of MWL. A machine learning approach has been utilized for detection of the level of MWL. We extracted different features from EEG, fNIRS, and EEG+fNIRS signals as the biomarkers of MWL and fed them to a linear support vector machine (SVM) as train and test sets. These features were selected based on their sensitivity to the changes in the level of MWL according to the literature. We introduced a new category of features within fNIRS and EEG+fNIRS systems. In addition, the performance level of each feature category was systematically assessed. We also assessed the effect of number of features and window size in classification performance. SVM classifier used in order to discriminate between different combinations of cognitive states from binary- and multi-class states. In addition to the cross-validated performance level of the classifier other metrics such as sensitivity, specificity, and predictive values were calculated for a comprehensive assessment of the classification system. The Hybrid (EEG+fNIRS) system had an accuracy that was significantly higher than that of either EEG or fNIRS. Our results suggest that EEG+fNIRS features combined with a classifier are capable of robustly discriminating among various levels of MWL. Results suggest that EEG+fNIRS should be preferred to only EEG or fNIRS, in developing passive BCIs and other applications which need to monitor users' MWL

Isokinetic Strength Profile Of Knee Flexors And Extensors In Young Soccer Players

Cieľom štúdie bolo stanoviť profil izokinetickej sily flexorov a extenzorov kolena u mladých futbalovýchhráčov pri koncentrickej svalovej kontrakcii. V prípade flexorov kolena bolo cieľom zistiť taktiež silu pri excentrickej kontrakcii a jej porovnanie s koncentrickou kontrakciou. Sledovanou skupinou boli hráči futbalu kategorie U17 (n = 19, vek = 16,4±0,3 rokov), ktorí hrajú najvyššiu domácu dorasteneckú ligovú súťaž. Parametre izokinetickej sily sme zisťovali pomocou izokinetického dynamomentru Cybex Humac Norm v uhlových rýchlostiach 30, 60 a 120 °/s pri excentrickej kontrakcii a v rýchlostiach 60, 180, 240 a 300 °/s pri koncentrickej kontrakcii. Výsledky nepreukázali signifikantné rozdiely svalovej sily flexorov kolena pri excentrickej kontrakcii v  troch sledovaných rýchlostiach (p>0,05). V  prípade koncentrickej svalovej činnosti boli zistené signifikantné rozdiely v produkcii svalovej sily v závislosti od uhlovej rýchlosti pohybu u flexorov i extenzorov kolena, keď so zvyšujúcou sa uhlovou rýchlosťou došlo k nižšej produkcii svalovej sily (p0,05). Regarding the concentric contraction we found significant differences for strength production depending on angular velocity for both knee extensors and flexors (p<0,01). Knee flexors generated more strength during eccentric contraction compared to concentric contraction. The strength profiles developed in the present study can assist in the establishment of baseline data in young soccer players or for comparison values with other researchers

Active Mass Quality And Segmental Distribution Of Body Fluids As A Precondition For Performance In Top-Performance Female Basketball Players

Príspevok prezentuje kvalitu aktívnej hmoty (netuková hmota, svalová hmota) a segmentálnu distribúciu tekutín v tele ako predpoklad výkonu u vrcholových basketbalistiek, strieborných medailistiek Majstrovstiev sveta 2010. Získané dáta preukázali úroveň netukovej hmoty (60,96±5,35 kg) a svalovej hmoty (57,07±5,0 kg) na úrovni elitných športovcov. Tuková hmota preukázala nižšie percentuálne zastúpenie ako je dostupnouliteratúrou prezentované (14,34±2,37 %). Na základe získaných dát nie je možné jednoznačne vyjadriť trend pri zastúpení u jednotlivých hráčskych postov. Segmentálne rozloženie tekutín preukázalo asymetriu v prospech dominantnej končatiny pri horných končatinách (p <0,01), čo indikuje nevyhnutnosť realizácie cvičení pre kompenzáciu zisteného bilaterálneho deficitu. V závere autori diskutujú o potrebe kontinuálneho sledovaniazmien kvality telesného zloženia v zmysle pozorovania jednotlivých zložiek vody resp. priamo a nepriamo merateľných parametrov pri bioimpedančnom meraní.The article presents active mass quality (fat free mass, muscle mass) and segmental distribution of body fluids as a prerequisite of performance in elite female basketball players who were silver medallists at 2010 World Championship. The collected data indicated the level of fat free mass (60.96±5.35 kg) and muscle mass (57.07±5.0 kg) of these elite athletes. Fat mass showed a lower percentage than is presented by available literature (14.34±2.37 %). Based on the collected data, it is not possible to definitely express a trend in proportion for individual playing positions. Segmental distribution of body fluids revealed a symmetry in favour of a dominant upper limb (p < 0.01), which indicate the need to perform exercises in order to compensate for detected bilateral deficit. In conclusion, the authors discuss the necessity of continually monitoring changes in body composition quality and in terms of monitoring the individual components of water both direct and indirect measurable parameters in bioimpedance measurement, respectively

Body Composition And Distribution Of Liquids In Female Elite Handball Players

Oblasť telesného zloženia v športe si vyžaduje veľkú pozornosť. Nadmerné množstvo tukovej hmoty predstavuje mŕtvu hmotnosť zvlášť v situáciách pre hádzanú typických – výskokoch, kde telesná hmota musí byť v priebehu lokomócie a výskokov opakovane prekonávaná proti gravitácii. Cieľom štúdie bolo zistiť telesné zloženie a distribúciu tekutín v jednotlivých segmentoch tela u reprezentačného tímu hádzanej (n = 16, vek 24,0±3,5 roku, telesná výška 176,0±6,5 cm, telesná hmotnosť 72,5±8,3 kg). Telesné zloženie bolo merané pomocou multifrekvenčnej bioimpedančnej metódy InBody (Biospace). Sledovanými parametrami bolo absolútne a relatívne množstvo netukovej hmoty (FFM a FFM/TH), percentuálne zastúpenie tukovej hmoty (FM), absolútne a relatívne množstvo vnútrobunečnej hmoty (BCM a BCM/TH), celková voda v tele (TBW) s rozlíšením extracelulárnej (ECW) a intracelulárnej tekutiny (ICW), segmentálne rozloženie tekutín v tele. V sledovanom súbore sme zaznamenali priemernú hodnotu TBW = 42,58 ± 3,99 l. Priemerná hodnota ICW bola 28,92 ± 2,53 l (67,92 %). Priemerná hodnota ECW bola 13,66 ± 1,57 l (32,08 %). FM činila priemerne 20,16 ± 4,08 %. FFM činila pre celý súbor 57,82 ± 5,27 kg, v relatívnom vyjadrení 0,80 ± 0,04. BCM mala v sledovanom súbore priemerné zastúpenie 40,47 ± 3,55 kg, v relatívnom vyjadrení 0,56 ± 0,03. Pri sledovaní rozloženia tekutín na končatinách sme zaznamenali významný rozdiel len pri horných končetinách (t15 = 5,95; p 0,05). Jednotlivé parametre telesného zloženia vypovedajú o hodnotách zodpovedajúcich športu elitnej úrovne. Pri interindividuálnom hodnotení boli zistené rozdiely z hľadiska hráčskej funkcie, u samotných parametrov telesného zloženia nie je však možné vyjadriť jednoznačne trend v závislosti od hráčskej funkcie. Nami prezentované výsledky môžu pomôcť ako istý vrcholový štandard pre porovnávanie kvality telesného zloženia hráčok nižšej výkonnostnej úrovne s cieľom optimalizovať a kompenzovať zistené rozdiely.The topic of body composition in sport requires a great deal of attention. Excessive adipose tissue acts as a dead weight, especially in situations characteristic of a handball jump, when body weight must be repeatedly lifted against gravity during locomotion and jumping. The purpose of the study was to determine body composition and distribution of liquids in individual body segments in a national team of female handball players (n = 16, age 24,0±3,5 years, body height 176,0±6,5 cm, body weight 72,5±8,3 kg). Body composition was measured by means of a multifrequency bioimpedance method InBody (Biospace). The examined parameters were the following: absolute and relative amount of fat free mass (FFM and FFM/BW), percentage of fat mass (FM), absolute and relative amount of body cell mass (BCM and BCM/TH), total body water (TBW) distinguishing extracellular water (ECW) and intracellular water (ICW) and distribution of body liquids in individual segments. In the monitored group, we recorded the mean value of TBW = 42,58±3,99. The mean value of ICW was 28,92±2,53 l (67.92 %). The mean value of ECW was 13.66±1,57 l (32,08 %). FM made 20,16 ± 4,08 %. FFM for the whole sample was 57,82±5,27 kg; in relative values it was 0,80±0,04. The mean proportion of BCM in the monitored group was 40,47±3,55 kg, in relative values 0,56 ± 0.03. Monitoring distribution of liquids in the extremities only showed a significant difference in the upper extremities (t15 = 5,95; p 0,01). In the lower extremities, we found out an equal proportion of liquids with an insignificant difference between the observed segments (t15 = 0,41; p > 0,05). Individual parameters of body composition indicate values corresponding to elite sport. Interindividual assessment revealed differences in terms of player’s function; however, when assessing parameters of body composition, it is not possible to express clearly the trend in the dependence on player’s function. Results of our study may help ascertain a standard for comparison of body composition in female players of a lower performance level with the aim of optimisation and compensation of differences