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El objetivo principal de esta investigación ha sido estudiar la alineación del cuerpo del bailaor(a), mientras realiza el zapateado durante el baile, para proporcionar una descripción detallada al servicio de los profesionales del flamenco: profesores, instructores y estudiantes de diferentes niveles. Se analizó la técnica de zapateado de una bailaora profesional. El análisis biomecánico se basó en treinta ciclos de seis secuencias de repeticiones consecutivas de zapateado. Se realizaron mediciones cinemáticas utilizando el sistema Vicon, mientras que la medición de las fuerzas de reacción del suelo (GRF), se realizaron con una plataforma de fuerza Kistler. Se analizaron los siguientes parámetros: el tiempo de cada zapateado; el valor máximo del componente vertical de GRF, en relación al peso corporal (BW), para la secuencia de zapateados; el impulso de GRF; la cinemática de la pelvis y las articulaciones de las extremidades inferiores; y la forma de onda del sonido de los golpes de los zapateados. Los valores medios de la componente vertical de GRF oscilaron entre 0.6 y 2.7 BW. La inclinación pélvica anterior máxima fue de 29º, con un rango de movimiento (RoM). Esta movilidad estuvo acompañada por un RoM de cadera de 20° y un RoM de rodilla de ~40° durante la flexión. Las conclusiones proporcionan información práctica para que docentes y estudiantes de baile flamenco puedan tenerla en consideración.

OBJECTIVE: The study aimed to identify the effects of ground reaction forces (GRF) recorded during landing in typical elements of three dance styles, including classical, modern, and folk dance, on injuries` topography. METHODS: The research involved a survey and measurements of GRF generated during landing after the jump. The survey involved a group of 90 professional dancers. In the questionnaire, the dancers marked areas of the human body that were affected at least once by injuries. Biomechanical tests of the GRF recording were conducted on a group of 15 professional dancers. The analysis focused on the following parameters: a maximum value of the vertical variable of the GRF relative to body weight (maxGRF_z), the time between the moment from first foot contact with the ground to the moment of reaching the maxGRF_z (_tmaxGRFz), and the loading rate of the GRF relative to body weight (LR_GRFz). RESULTS: Regardless of dance style and sex, the lower spine, knee joints, ankle joints and feet were the areas most affected by injuries among professional dancers. The level of maxGRF_z, t_maxGRFz and LR_GRFz during typical jumps in classical, modern, and folk dance was statistically significantly different (P

Two series of rare earth coordination compounds have been synthesized (Na[RE(L4)] (labeled as 1RE) and PPh4[RE(L4)] (labeled as 2RE), where RE = Y3+, Eu3+, Tb3+, L = 2,2,2-trichloro-N-(diphenylphosphoryl)acetamide) to determine the possibility of modifying their photophysical and magnetical properties by changing the counterion. The crystal structure of 1RE was determined based on the single-crystal X-ray diffraction and the crystal structure of 2RE was determined based on quantum chemistry computational procedures. Characterization of the physicochemical properties of the compounds was carried out using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), 1H and 31P NMR spectroscopy as well as FT-IR, absorption and luminescence spectroscopy in the temperature range of 300 - 77 K. The rate constants of radiative (Arad) and non-radiative (Anrad) transitions, intrinsic (QLnLn) and overall (QLnL) emission quantum yields, sensitization efficiency (ηsens), the experimental and theoretical intensity parameters (Ωλ), the forward (WS, WT) and backward (WbS, WbT) intramolecular energy transfer (IET) rates were determined. Magnetic properties of Tb3+ compounds were studied in a constant field of 0.5 T in the temperature range of 1.8–300 K. Dynamic AC magnetic susceptibility measurements were carried out as a function of temperature and frequency for 1Tb and 2Tb. Only in the case of 2Tb, in the presence of an external DC field, a slight temperature dependence of in-phase χ′ and out-of-phase χ'' susceptibility was recorded. Based on experimental and theoretical results, the significant effect of counterion on the photophysical and magnetic properties of RE chelates has been demonstrated and clarified, providing valuable guidance for the design of bifunctional electromagnetic radiation converters.

Studies investigating the relationship between balance ability and body size, build and proportions tend to concentrate on body mass and height rather than breadth parameters or size of individual body segments. The purpose of this study was to determine a relationship between the ability to keep balance and the size, build and proportions, based on breadth and length dimensions of the body in healthy adult men and women during a position of free standing. This study also aimed to investigate how the lack of visual control affects the analyzed relationship. The study group consisted of 102 adults of both sexes. The investigations encompassed anthropometric measurements of the body and the ability to keep balance. The analysis covered a of series anthropometric parameters, 9 indices of body proportions, mean velocity of the COP movement (MV) and ellipse area (EA). A statistical analysis of the results was carried out taking into consideration the division into groups due to sexes. The results of the Pearson correlation have revealed that there is a statistically significant correlation (weak or moderate degree) between anthropometric parameters of the body and stabilographic values. Results differ between sexes and depend on whether Romberg’s test was performed with open or closed eyes. The obtained results showed that the surface area of ellipse significantly depends on the dimensions of these body elements which relate to the position of the centre of mass. The obtained results, which differ depending on sex, show that the values of the body sways in a position of free standing depend on breadth and length dimensions of the body, visual control and the analyzed parameter of balance.

The increasing prevalence of adult obesity is a major global health problem. Causes include sedentary lifestyles and physical inactivity, as well as the place and style of work. This work aimed to assess the impact of an increase in BMI, resulting from a sedentary lifestyle, on the functioning of the human musculoskeletal system during daily activities. Standing and sitting down were analyzed using numerical simulations in the AnyBody Modeling System. The results showed that by 2050, an increase in body weight will lead to an 11% increase in lumbar spine loads and up to 14% increase in knee and hip joint loads compared to 2015. Increased body weight will also increase muscle fatigue, requiring the body to exert more force to perform the same activities. The BMI change prediction model shows that the average man will be overweight or obese in the coming years, which will likely increase musculoskeletal loads.

The increasing prevalence of adult obesity is a major global health problem. Causes include sedentary lifestyles and physical inactivity, as well as the place and style of work. This work aimed to assess the impact of an increase in BMI, resulting from a sedentary lifestyle, on the functioning of the human musculoskeletal system during daily activities. Standing and sitting down were analyzed using numerical simulations in the AnyBody Modeling System. The results showed that by 2050, an increase in body weight will lead to an 11% increase in lumbar spine loads and up to 14% increase in knee and hip joint loads compared to 2015. Increased body weight will also increase muscle fatigue, requiring the body to exert more force to perform the same activities. The BMI change prediction model shows that the average man will be overweight or obese in the coming years, which will likely increase musculoskeletal loads. [ABSTRACT FROM AUTHOR]