How to design and establish a national school-based physical fitness monitoring and surveillance system for children and adolescents: A 10-step approach recommended by the FitBack network.

BACKGROUND: Providing individual- and population-level data on children's physical fitness (PF) is a crucial public health and education priority. However, few national fitness monitoring or surveillance systems are currently in practice internationally. We aim to summarize the current European PF monitoring and surveillance systems for school-aged children and to provide experience-based guidelines on how to design such systems. METHODS: The FitBack network consists of experts from diverse backgrounds with the common interest to improve the accessibility of PF monitoring for young people globally. Through FitBack network, we identified and compared the national or regional PF monitoring and surveillance systems currently in operation across Europe. We formulated a 10-step approach for designing and establishing one's own system, based on analysis of experienced strengths, weaknesses, opportunities, and threats to monitoring childhood fitness. RESULTS: We identified a total of eight PF monitoring systems in Finland, France, Galicia of Spain, Hungary, Lithuania, Portugal, Serbia, and Slovenia. The FitBack network recommends the following steps for designing and establishing one's own system: (1) set up mission statements and aims, (2) involve stakeholders, (3) utilize scientific background, (4) governance structure, (5) ensure sufficient funding, (6) data management planning, (7) provide meaningful feedback, (8) conduct pilot testing, (9) plan implementation process, and (10) invest in communication with stakeholders. CONCLUSIONS: This study provides an updated overview of the best practices for school-aged children's fitness monitoring and surveillance in Europe. Additionally, it offers a 10-step approach to assist in the creation of similar systems in Europe or globally.

European fitness landscape for children and adolescents: updated reference values, fitness maps and country rankings based on nearly 8 million test results from 34 countries gathered by the FitBack network.

OBJECTIVES: (1) To develop reference values for health-related fitness in European children and adolescents aged 6-18 years that are the foundation for the web-based, open-access and multilanguage fitness platform (FitBack); (2) to provide comparisons across European countries. METHODS: This study builds on a previous large fitness reference study in European youth by (1) widening the age demographic, (2) identifying the most recent and representative country-level data and (3) including national data from existing fitness surveillance and monitoring systems. We used the Assessing Levels of PHysical Activity and fitness at population level (ALPHA) test battery as it comprises tests with the highest test-retest reliability, criterion/construct validity and health-related predictive validity: the 20 m shuttle run (cardiorespiratory fitness); handgrip strength and standing long jump (muscular strength); and body height, body mass, body mass index and waist circumference (anthropometry). Percentile values were obtained using the generalised additive models for location, scale and shape method. RESULTS: A total of 7 966 693 test results from 34 countries (106 datasets) were used to develop sex-specific and age-specific percentile values. In addition, country-level rankings based on mean percentiles are provided for each fitness test, as well as an overall fitness ranking. Finally, an interactive fitness platform, including individual and group reporting and European fitness maps, is provided and freely available online (www.fitbackeurope.eu). CONCLUSION: This study discusses the major implications of fitness assessment in youth from health, educational and sport perspectives, and how the FitBack reference values and interactive web-based platform contribute to it. Fitness testing can be conducted in school and/or sport settings, and the interpreted results be integrated in the healthcare systems across Europe.

Guidelines-Driven Educational Intervention Promotes Healthy Lifestyle Among Adolescents and Adults: A Serbian National Longitudinal Study.

Background and objectives: The effectiveness of short-term focused educational programs to change health behaviors across large populations seems to be poorly described so far. The main aim of the present study was to evaluate an age-specific 45-min educational program, designed in accordance with the current U.S. Department of Health and Human Services and U.S. Department of Agriculture dietary guidelines and physical activity (PA) guidelines, among adolescents and adults. Materials and Methods: We evaluated the health-promoting lifestyle habits by the Health-Promoting Lifestyle Profile (HPLP-II) at baseline and following 6⁻8 weeks post-education in a nationally representative sample of Serbian adolescents and adults (n = 3822). Results: The percentage of adolescents eating 3⁻5 servings of vegetables per day increased at follow-up (20.1% versus 23.1%, p = 0.001), with significantly more adolescents regularly reading food labels (from 12.2% at baseline to 14.2% at follow-up; p = 0.02). Taken together, mean HPLP-II scores in adolescents significantly improved for both diet (0.05 points; p < 0.0001) and PA (0.09 points; p < 0.0001), and for PA in adults (0.08 points; p < 0.0001). Hierarchical multiple regression analysis revealed that our model as a whole (including time of testing as a predictor variable, and age and gender as control variables) explained 3.0% of the variance in mean HPLP-II scores for diet (p = 0.942) and 3.0% for PA (p = 0.285) in adolescents, and 1.1% of the variance in HPLP-II scores for diet (p = 0.781) and 1.9% for PA (p = 0.075) in adults, respectively. Conclusions: It appears that a brief focused education can positively tackle unhealthy lifestyles in promoting good health in general population. Different modes of interactive communication used here appeared to strengthen participants' capacities for lifestyle changes.

Thinness in young schoolchildren in Serbia: another case of the double burden of malnutrition?

OBJECTIVE: Thinness is rarely highlighted or regularly monitored among children in developed countries although it may be rather frequent and pose a significant risk to children's health. We aimed to describe the prevalence of mild, moderate and severe thinness among young Serbian schoolchildren. DESIGN: Cross-sectional study of schoolchildren aged 6-9 years. Children were assessed for weight, height and BMI as part of the WHO European Childhood Obesity Surveillance Initiative in Serbia. Thinness grades were defined as gender- and age-specific cut-offs for BMI according to the International Obesity Task Force criteria. SETTING: Serbia, September to November 2015. SUBJECTS: Students (n 4861) in grades 2 and 3 (6-9 years, 2397 girls). RESULTS: Overall prevalence of thinness in Serbian schoolchildren was 9·6 %. Mild thinness was clearly the largest category with a prevalence of 7·6 %, moderate thinness was present in 1·7 % of children and severe thinness was found in 0·3 % of children. OR indicated a significant risk of being thin for girls (1·44 times higher compared with boys) and children attending schools with no health-focused educational programme (1·57 times more likely to be thin than peers enrolled in schools with such programmes). In addition, OR for thinness tended to be 1·23 times higher in children living in an economically disadvantaged region of Serbia (P=0·06). CONCLUSIONS: A rather high prevalence of thinness highlights this malnutrition disorder as an emerging health issue that should trigger public health policies to tackle thinness, especially in girls of young age and children living in economically disadvantaged areas.

Chronoamperometric study of elemental sulphur (S) nanoparticles (NPs) in NaCl water solution: new methodology for S NPs sizing and detection.

BACKGROUND: Elemental sulfur (S) persists in natural aquatic environment in a variety of forms with different size distributions from dissolved to particulate. Determination of S speciation mainly consists of the application of chromatographic and electrochemical techniques while its size determination is limited only to the application of microscopic and light scattering techniques. S biological and geochemical importance together with recent increases of S industrial applications requires the development of different analytical tools for S sizing and quantification. In recent years the use of electrochemical measurements as a direct, fast, and inexpensive technique for the different nanoparticles (NPs) characterization (Ag, Au, Pt) is increasing. In this work, electrochemical i.e. chronoamperometric measurements at the Hg electrode are performed for determination of the size distribution of the S NPs. RESULTS: S NPs were synthesized in aqueous medium by sodium polysulphide acidic hydrolysis. Chronoamperometric measurements reveal the polydisperse nature of the formed suspension of S NPs. The electrochemical results were compared with dynamic light scattering measurements parallel run in the same S NPs suspensions. The two methods show fairly good agreement, both suggesting a log-normal size distribution of the S NPs sizes characterized by similar parameters. CONCLUSIONS: The preliminary results highlight the amperometric measurements as a promising tool for the size determination of the S NPs in the water environment.

Psychometric Properties of the Attitudes toward Physical Activity Scale: A Rasch Analysis Based on Data From Five Locations.

This article describes the development and validation of the Attitudes toward Physical Activity Scale (APAS) to measure the attitudes, beliefs, and self-efficacy toward physical activity by children at the primary school level. The framework included: physical fitness, self-efficacy, personal best goal orientation in physical activity, interest in physical activity, importance of physical activity, benefits of physical activity, contributions of video exercise to learning in school subjects, contributions of video exercise to learning about health and environmental support. The sample comprised of 630 school students between grades 1 and 7 from five countries, namely Lithuania (29%), Poland (26%), Serbia (19%), Singapore (16%) and Zimbabwe (11%). Rasch analysis found empirical evidence in support of measurement validity of the APAS in terms of Rasch item reliabilities, unidimensionality, effectiveness of response categories, and absence of gender differential item functioning (DIF). The validation of the APAS according to the Rasch model meant that a dependable tool was established for gauging programme effectiveness of intervention programs on physical activity of primary school children in classroom settings at various geographical locations globally.

Physical self-concept of adolescents in Western Balkan countries: a pilot study.

The aim of this study was to explore physical self-concept of adolescents of the Western Balkans (Serbia, Slovenia, Croatia, and Bosnia and Herzegovina) according to sex and country. The participants were 2,606 students, ages 13 and 14 years (M = 13.5, SD = 0.9). The Physical Self-Description Questionnaire (PSDQ) was used to assess multidimensional physical self-concept. The results show the interaction of sex and country for three dimensions of physical self-concept (Appearance, Global Physical Self-Concept, and Self-Esteem). It was shown that female and male adolescents' perception of physical appearance, self-esteem, and global physical self-concept is more susceptible to influences of socio-cultural factors in the monitored countries. In all other dimensions of Physical self-concept, sex differences were consistently manifested in favour of male adolescents, except in Flexibility. Regardless of adolescents' sex, under the increasing influence of Western culture in the Western Balkan countries, adolescents more critically evaluate their body and motor abilities.

Speech-language pathologists' professional stress level and factors affecting it in the Republic of Serbia.

BACKGROUND: In the Republic of Serbia, to our knowledge, there has been no research dedicated to the professional stress faced by speech-language pathologists (SLPs). Since speech therapy belongs to the helping professions, SLPs might experience professional stress. OBJECTIVE: To examine the levels of professional stress in SLPs concerning sociodemographic characteristics and terms of the workplace. METHODS: The research was conducted online, using a questionnaire designed to determine professional stress in speech-language pathologists - Speech-Language Pathologist Stress Inventory. The voluntary sample consisted of 185 employed SLPs from the Republic of Serbia. The stress level was observed concerning marital status, years of working experience, age, educational degree, caseload size, job sector, job setting, type of patients' diagnosis, and type of service which SLPs provide. RESULTS: The results showed that SLPs experience mild to moderate levels of professional stress and that there is a statistically significant difference in the stress level concerning years of working experience, age, job sector, and job setting. Applying Generalized Linear Mixed Model revealed that two-way interaction (Years of working experience * Marital status) and three-way interaction (Age * Job Setting * Type of patients' diagnosis) dominated on the model. CONCLUSION: Since it is noted that SLPs are experiencing mild to moderate levels of professional stress, it is important to emphasize the need for adaptation of existing work terms as well as to provide additional support to speech therapists in order to improve their mental health.

Opto-magnetic imaging spectroscopy in analyzing rotary NiTi endodontic instruments.

Intra-canal fracture of rotary NiTi instruments occurs due to torsional stress, cyclic fatigue, or a combination of these two factors. Broken instruments are a serious obstacle to shaping, cleaning, and filling of the root canal and can adversely affect the outcome of endodontic therapy. The aim of this study was to examine the magnetic properties and ultrastructural changes of new, used, and fractured NiTi instruments using opto-magnetic imaging spectroscopy (OMIS). The study included three sets of different types of rotary instruments: MTwo (VDW, Munich, Germany), Pro Taper Universal (Dentsply Maillefer, Ballaigues, Switzerland), and BioRace (FKG DENTAIRE Swiss Dental Products, Le Crêt-du-Locle Switzerland). Root canal shaping was performed on root canals with different curvatures, and after intra-canal fracture, instruments of the same type (new, used, and fractured) were analyzed using OMIS at the Faculty of Mechanical Engineering, University of Belgrade. The obtained results showed a coincidence of peak localization for the used instruments that did not suffer a fracture, as well as for new, unused instruments of all examined groups. Additionally, there was a coincidence of peak intensities for new and fractured instruments in all groups. The specific treatment of electropolishing of the active surface of BioRace instruments caused a completely different electromagnetic response compared to conventional NiTi sets of tested instruments. New, unused BioRace instruments had the most pronounced positive (5.6078 n.a.u. x1000) and negative (-8.5218 n.a.u. x1000) intensity values. The analysis of NiTi instruments using opto-magnetic imaging spectroscopy indicated changes in the magnetic properties after their instrumentation.

Is the physical fitness of schoolchildren dependent on their physical activity levels and nutritional status? The experience from Serbia.

Introduction: Introduction: based on the presumed relationship between physical activity and physical fitness, it seems reasonable to expect that being active would result in sufficient fitness levels. However, the relationship between physical activity and fitness is not so plausible and needs deeper exploration. Objectives: we conducted a study aimed at exploring: a) the potential variation in physical activity level by gender and school grade; and b) the effect of physical activity level, gender, and nutritional status on physical fitness test results. Methods: a total of 2795 males and 2614 females participated in the study (11-14 years). Their physical fitness was assessed by measuring anthropometric status, muscular fitness, endurance, flexibility, agility, and cardiorespiratory fitness, while their physical activity was assessed using the Physical Activity Questionnaire (PAQ-A). Results: a higher percentage of boys were highly active, while a higher percentage of girls were scarcely active (χ2 [2, n = 5017] = 151.4, p < 0.01). Decline in physical activity with age was higher in girls than in boys (χ2 [6, n = 5409] = 90.4, p < 0.01). MANOVA revealed a significant effect of gender (V = 0.009, F [6, 3669] = 5.29, p < 0.01), nutritional status (V = 0.193, F [12, 7340] = 65.16, p < 0.01) and physical activity levels (V = 0.043, F [12, 7340] = 13.60, p < 0.01) on tests outcomes. Conclusions: our study has shown that activity level in Serbian schoolchildren declines with age and is affected by nutritional status. Nutritional status represents a significant factor confounding physical fitness scores, regardless of activity levels.

Introducción: Introducción: basado en la presumible relación entre la actividad física y la condición física, parece razonable esperar que ser activo físicamente resulte en niveles suficientes de condición física. Sin embargo, la relación entre la actividad física y la forma física no es tan plausible y necesita una exploración más profunda. Objetivos: realizamos un estudio con el objetivo de explorar: a) la variación potencial en el nivel de actividad física en función del género y el grado escolar; y b) el efecto del nivel de actividad física, el género y el estado nutricional en el resultado de las pruebas de condición física. Métodos: un total de 2795 hombres y 2614 mujeres participaron en el estudio (11-14 años). Su condición física se evaluó midiendo el estado antropométrico, la aptitud muscular, la resistencia, la flexibilidad, la agilidad y la aptitud cardiorrespiratoria, mientras que la actividad física se evaluó mediante el Cuestionario de Actividad Física (PAQ-A). Resultados: un mayor porcentaje de niños eran muy activos, mientras que un mayor porcentaje de niñas eran poco activas (χ2 [2, n = 5017] = 151,4, p < 0,01). La disminución de la actividad física con el incremento de la edad fue mayor en las niñas que en los niños (χ2 [6, n = 5409] = 90,4, p < 0,01). El MANOVA reveló un efecto significativo del género (V = 0.009, F [6, 3669] = 5.29, p < 0.01), el estado nutricional (V = 0.193, F [12, 7340] = 65.16, p < 0.01) y los niveles de actividad física (V = 0.043, F [12, 7340] = 13.60, p < 0.01) en los resultados de las pruebas. Conclusiones: nuestro estudio ha demostrado que el nivel de actividad física en los escolares serbios disminuye con la edad y se ve afectado por el estado nutricional. El estado nutricional representa un factor significativo que confunde las puntuaciones de condición física, independientemente de los niveles de actividad.

Immediate and Long-Term Porosity of Calcium Silicate-Based Sealers.

INTRODUCTION: Open pores between endodontic sealer and root canal walls present potential niches for bacterial growth and migration pathways. The aim was to assess the internal and external porosity of calcium silicate-based sealers and to ascertain the long-term effect of storage in simulated body fluid on sealer porosity. METHODS: Sixteen single-rooted teeth were filled with gutta-percha and 1 of 4 root canal sealers: BioRoot RCS, EndoSequence BC, MTA Fillapex, or AH Plus. Obturated roots, stored in Hank's balanced salt solution, were scanned after 7 days and after 6 months by using micro-computed tomography at an isotropic resolution of 9.9 µm. Total, open, and closed porosity were calculated in the coronal, middle, and apical thirds. Data were statistically analyzed by using general linear model and paired t test (α = 0.05). RESULTS: Significantly higher percentage of open than closed porosity was found in all groups. Initially, significantly greater open and total porosity were found for MTA Fillapex than for AH Plus. After 6 months, the percentage of open and total porosity increased in BioRoot RCS and MTA Fillapex and decreased in AH Plus and EndoSequence BC. Both initially and after storage, coronal region of all sealers had significantly greater total porosity than middle and apical regions, which were comparable. CONCLUSIONS: None of the root fillings were void-free, with predominant open porosity persisting after long-term storage.

Health-related physical fitness levels and prevalence of obesity in Serbian elementary schoolchildren.

INTRODUCTION: Objectives: the aims of the study were to provide gender- and age-specific physical fitness levels among Serbian schoolchildren and to identify prevalence of overweight and obesity. Methods: a sample of 6,188 boys and 6,023 girls aged nine to 14 years were assessed using the physical fitness battery established through the National Fitness Project of Serbia. Physical fitness levels were determined for body height, body weight and body mass index and for six physical fitness tests (sit and reach, 4 x 10 m shuttle run, standing long jump, 30 sec sit-ups, bent arm hang, 20-m shuttle run). Centile smoothed curves for the 5rd, 25th, 50th, 75th and 95th percentiles were calculated using Cole's LMS method. Prevalence of overweight and obesity was identified applying cut-off points for children (International Obesity Task Force). Results: the results revealed that anthropometric measures were higher in boys than in girls. In addition, boys had better physical fitness levels for all tests except for the sit and reach test, where girls performed slightly better. The overall prevalence of overweight and obesity amounts to 24.8% (19.8% overweight and 5% obese). With respect to gender, the prevalence of overweight and obesity was higher in boys (27%) compared to girls (22.4%). Conclusion: the presented data are the most up-to-date gender- and age-specific physical fitness levels for Serbian schoolchildren aged 9-14 years. The findings regarding prevalence in overweight and obesity indicated an alarming trend when compared to similar data from other similar studies (in European countries).

INTRODUCCIÓN: Objetivos: los objetivos del estudio fueron evaluar los niveles de condición física diferenciados por sexo y edad de estudiantes de escuela primaria de Serbia e identificar la prevalencia de sobrepeso y obesidad. Método: una muestra de 6.188 niños y 6.023 niñas de entre nueve y 14 años fueron evaluados mediante una batería de test físicos establecidos por el Proyecto Nacional de Condición Física de Serbia. Se evaluó la condición física mediante la altura,el peso, el índice de masa corporal y seis test físicos. Se calcularon curvas suavizadas para los percentiles 5, 25, 50, 75 y 95 usando el método de Cole. La prevalencia de sobrepeso y obesidad fue identificada aplicando los puntos de corte para niños (International Obesity Task Force). Resultados: los resultados revelaron medidas antropométricas mayores en niños que en niñas. Además, los niños tuvieron mejores niveles de condición física en todos los test, con la única excepción del sit and reach, que las niñas realizaron ligeramente mejor. La prevalencia de sobrepeso y obesidad fue del 24,8% (19,8% sobrepeso y 5% obesidad). Respecto al género, la prevalencia de sobrepeso y obesidad fue superior en los niños (27%) en comparación con las niñas (22,4%). Conclusión: los datos presentados son los más actualizados respecto a los niveles de condición física específicos para el género y la edad de niños estudiantes de Serbia de entre nueve y 14 años. Los hallazgos respecto a la prevalencia de sobrepeso y obesidad indican una tendencia alarmante frente a datos similares de otros estudios equivalentes (en países europeos).

Physical fitness for sedentary students: a common trend from six European countries.

BACKGROUND: Several studies have assessed the fitness level of students to evaluate physical condition, compare groups with differences in social disadvantage and to define indexes for post training programs. Often, these large surveys compared groups without normative value that could define the real, practical gaps. Thus, the aim of this study was the definition of baseline values describing the fitness level of sedentary European students. METHODS: Standing broad jump (SBJ), sit up (SUP) and sit and reach (SAR) physical fitness tests were assessed on 31,476 students (age=11-13) from 6 European countries were collected and analyzed. RESULTS: The effect size for multiple groups ANOVA was obtained to verify the biological consistence of differences. Then, weighted-means were calculated and stratified for age and gender. Overall, boys obtained SAR scores close to zero, while girls obtained results between 2 and 7 cm. The SUP test revealed similar results between boys and girls (about 20). SBJ performances were similar among countries (over 160 cm for boys and 150 for girls). CONCLUSIONS: Our results were aligned to other studies performed in other Continents or Countries and can contribute to the establishment of a large and objective reference to readily evaluate the physical fitness and health-related status of young students.

Mediterranean Diet and Its Correlates among Adolescents in Non-Mediterranean European Countries: A Population-Based Study.

Little is known about the factors which might influence the adherence to a Mediterranean diet in non-Mediterranean European countries. Thus, the main purpose of this study was to determine the associations between socioeconomic, psychological, and physical factors on a Mediterranean diet. In this cross-sectional study, participants were 14-18-year-old adolescents (N = 3071) from two non-Mediterranean countries: Lithuania (N = 1863) and Serbia (N = 1208). The dependent variable was Mediterranean diet, and was assessed with the Mediterranean Diet Quality Index for children and adolescents questionnaire. Independent variables were gender, body-mass index, self-rated health, socioeconomic status, psychological distress, physical activity, and sedentary behavior. The associations between dependent and independent variables were analyzed by using logistic regression. Results showed that higher adherence to a Mediterranean diet was associated with higher self-rated health, socioeconomic status, and physical activity, yet low adherence to a Mediterranean diet was associated with being female, having higher body-mass index, psychological distress, and sedentary behavior. Our findings suggest that future studies need to explore associations between lifestyle habits-especially in target populations, such as primary and secondary school students.

Factors associated with good self-rated health in European adolescents: a population-based cross-sectional study.

OBJECTIVES: The aim of the present study was to investigate self-reported health status and associated factors. METHODS: In this cross-sectional study, the participants were 6501 adolescents (52% females) aged 14-19 years from three European countries: Croatia, Lithuania and Serbia. Self-rated health was assessed by using one item question: "How would you perceive your health?" The answers were arranged along a 5-point Likert-type scale: (1) very poor, (2) poor, (3) fair, (4) good and (5) excellent. The outcome was binarized as "good" (fair, good and excellent) and "poor" health (very poor and poor). Potential factors associated with self-rated health included demographic (age, gender, socioeconomic status and body-mass index), social (social capital) and lifestyle (physical activity and psychological distress) variables. RESULTS: In both univariate and multivariate models, being older, being a boy, having higher level of family, neighbourhood and school social capital, participating in moderate-to-vigorous physical activity more frequently and having low psychological distress were associated with good self-rated health. CONCLUSIONS: Our findings suggest strong associations between social and lifestyle factors and self-rated health. Other explanatory variables will require future research.

WHO European Childhood Obesity Surveillance Initiative in Serbia: a prevalence of overweight and obesity among 6-9-year-old school children.

BACKGROUND: The World Health Organization (WHO) European Childhood Obesity Surveillance Initiative (COSI) is a public health program established in order to understand the progress of the obesity epidemic in young populations and gain inter-country comparisons within the European region, yet the data from a number of East European countries, including Serbia, were not available then. Therefore, the main aim of this cross-sectional study was to collect data about the prevalence of overweight and obesity among 6-9-year-old school children in Serbia according to the standardized protocol during the Fourth COSI Implementation Round. METHODS: From September 2015 to November 2015, 5102 first- and second-grade primary-school children (age 7.7±0.6 years) were assessed for weight, height, and body mass index (BMI) in 14 Serbian school districts. RESULTS: The prevalence rates of obesity, as calculated using the International Obesity Task Force (IOTF) cut-off points, vary across different age groups, with the lowest obesity rates reported in 7-year-old boys (6.2%), while the highest obesity prevalence rates were observed in 6-year-old boys (9.7%). In addition, being overweight was strongly associated with poor local community development and lower level of urbanization. The overall prevalence of overweight (23.1%, including obesity) and obesity (6.9%) in Serbian primary-school children seem to be comparable to rather high rates previously reported in other countries participating in the COSI program, indicating an obesity epidemic in Serbian children. CONCLUSIONS: This surveillance system should be regularly implemented throughout Europe, providing comparable data on rates of overweight/obesity in primary schools that might drive prudent actions to reverse the pandemic trend of childhood obesity.

Accuracy of three electronic apex locators in determining the apical foramen in multi-rooted teeth: Randomised clinical and laboratory study.

This study aimed to compare the accuracy of three electronic apex locators (EALs), Raypex 5, Apex NRG and ProPex II, in locating the apical foramen (AF) in vivo. Thirty multi-rooted teeth were included in the study. Distances from the file tip to the radiographic apex from the buccal (R1) and mesial (R2) aspect were measured after extraction. The distance from the file tip to the AF (L) was measured microscopically. Raypex 5, Apex NRG and ProPex II were accurate to within ± 0.5 mm in 84.6%, 78.6% and 66.7% of cases, respectively. R1, R2 and L measurements between the EALs were not statistically different (P > 0.05). R1 and L correlated positively (r(2) = 0.817; P < 0.001). There were no significant differences in all measurements between vital and non-vital root canals (P > 0.05). There was no statistically significant difference between the EALs. There was a positive correlation between electronic and radiographic measurements when locating the AF.

Sequential separation of Fe and Sr from liquid samples by using Sr resin and rapid determination of 55Fe and (89,9°)Sr.

The obtained results showed that the Sr resin can be used for the chromatographic separation of Fe (III) and Sr (II) ions by using a mixture of HCl and HNO3. It was shown that the binding strength of Fe (III) decreases with increasing concentration of HNO3 while the binding strength of Sr (II) increases. It was found that the optimal bonding strength is achieved in 6 mol/L HCl:3 mol/L HNO3 and varying concentrations of acid in the mixture allow their selective separation. On basis of these results, a method for the separation of (55)Fe and (89,90)Sr from liquid samples which consists of binding of Fe and Sr on Sr resin and separation from a number of elements by 6 mol/L HCl:3 mol/L HNO3 and their mutual separation by eluting of Sr with 4 mol/L HCl is established. The method enables efficient simultaneous separation (with high recovery) of (89,90)Sr and (55)Fe and in combination with Cerenkov counting rapid determination of (89,90)Sr.

Some indicators of fatness and motor fitness in Slovenian and Serbian children / Algunos indicadores de obesidad y aptitud motriz en niños eslovenos y serbios

The purpose of this study was to identify sex and age specific differences in fatness and motor fitness levels of children in two western Balkan countries in south-eastern Europe: Slovenia and Serbia. The sample consisted of 1,659 subjects of both sexes, aged from 9 to 15 years. Body height, body mass, triceps skinfold thickness, bent arm hang and standing long jump were used in the analysis. Ordinal regression was used to test differences in body mass index (BMI) categories among the countries. MANOVA was used to test the differences in motor fitness level. There were statistically significant (p<0.001) differences between the countries for the entire set of tested variables. Boys and girls from both countries had similar body height, body mass and BMI, yet Slovenians had smaller triceps skinfold thickness. Children from both countries were superior in standing long jump compared to their counterparts elsewhere in Europe. However, Slovenian boys and girls performed better than Serbian ones in both performed motor tests. Differences between countries in motor tests results were larger at age 9 than at age 14. Apparent trend was detected: with similar morphological characteristics, Slovenian children, especially girls, are physically fitter than Serbian ones. Sex is the only significant parameter (p<0.001) of classifying into a BMI category. Boys have an approximate odds ratio of 1.75 for passing into a higher BMI category as girls. Among girls, the differences between countries were greater since the prevalence of overweight and obese girls in Slovenia decreases with age, while the reverse trend is observed in Serbia.

El propósito de este estudio fue identificar las diferencias específicas de sexo y edad en la aptitud y niveles de condición física en niños de dos países de los Balcanes occidentales en el sudeste de Europa: Eslovenia y Serbia. La muestra consistió en 1.659 sujetos de ambos sexos, con edades entre los 9 y 15 años. Para el análisis se utilizaron la altura corporal, masa corporal, espesor del pliegue cutáneo del tríceps, brazo doblado al colgar y de pie en salto largo. Se utilizó la regresión ordinal para probar las diferencias en el índice de masa corporal (IMC) categorías entre los países. El análisis MANOVA fue utilizado para probar las diferencias en el nivel de condición motriz física. El conjunto de variables analizadas (p<0,001) entre los países no fueron estadísticamente significativas. Los niños y niñas de ambos países tenían similar altura y masa corporal e IMC, pero en los eslovenos los pliegues cutáneos del triceps más pequeños. Los niños de ambos países fueron superiores en salto largo en comparación con sus homólogos de otras partes de Europa. Sin embargo, los niños y las niñas eslovenos obtuvieron mejores resultados que los serbios en ambas pruebas de motricidad. Las diferencias en los resultados de las pruebas de motricidad entre los países fueron mayores a los 9 años de edad, a los 14 años se detectó una tendencia aparente: con características morfológicas similares, los niños eslovenos, particularmente las niñas, se encontraban en mejores condiciones físicas que los niños serbios. El sexo es el único parámetro significativo (p<0,001) de clasificar en una categoría de IMC. Los niños tienen una probabilidad promedio aproximada de 1,75 para pasar a una categoría superior IMC tal como las niñas. Entre las niñas, las diferencias entre los países eran mayores, ya que la prevalencia de las niñas con sobrepeso y obesidad en Eslovenia disminuyen con la edad, mientras que se observó una tendencia inversa en Serbia.