scholarly journals BODY AND PERFORMANCE IN RHYTHMIC GYMNASTICS: SCIENCE OR BELIEF?

2021 ◽  
Vol 13 (3) ◽  
pp. 311-321
Author(s):  
Laura de Oliveira ◽  
Vítor Ricci Costa ◽  
Kizzy Fernandes Antualpa ◽  
Myrian Nunomura
Keyword(s):  
Rhythmic Gymnastics ◽  
And Performance

scholarly journals Volitional regulation and performance of sports gifted young athletes

2019 ◽  
Vol 70 ◽  
pp. 08042
Author(s):  
Natalya Ulyanova ◽  
Oksana Chernykh
Keyword(s):  
Joint Effect ◽  
Sport Performance ◽  
Individual Characteristics ◽  
Self Control ◽  
Young Athletes ◽  
Rhythmic Gymnastics ◽  
Athletic Success ◽  
Significant Regression ◽  
And Performance ◽  
The Relationship

The empirical study of the involvement of personal volition in the athletic success of young athletes aged 9 to 18 yearsis presented. The purpose of this study was to examine the relationship between individual characteristics of volitional processes and the grade of sport performance, determined by the sports qualifications of the respondents.The specifics and requirements ofdifferent kinds of sport have been considered. At the sample of young athletes from 9 to 18 years old (N = 145, M = 13,2 years) for some sports (athletics, rock climbing, football)significant regression models were built. Particular characteristics of volitional processes or their combination were discovered as predictors, and the athlete’s performance was a dependent variable. For other sports disciplines (boxing, rowing, swimming, rhythmic gymnastics), such models could not be identified. Moreover, we established that emotional self-control and determination have a joint effect on the grade of sport performance of athletes who was younger than 13, while for athletesfrom 14 to 18 years oldcommon predictors of performance from among volitional qualities was not found.

Training-Load Management in Rhythmic Gymnastics: Practices and Perceptions of Coaches, Medical Staff, and Gymnasts

2021 ◽  
pp. 1-11
Author(s):  
Paula B. Debien ◽  
Thiago F. Timoteo ◽  
Tim J. Gabbett ◽  
Maurício G. Bara Filho
Keyword(s):  
Medical Staff ◽  
Perceived Exertion ◽  
Daily Basis ◽  
Training Load ◽  
Rating Of Perceived Exertion ◽  
Load Management ◽  
Specific Training ◽  
Rhythmic Gymnastics ◽  
Effective Training ◽  
And Performance

Purpose: This study described and analyzed practices and perceptions of rhythmic gymnastics coaches, medical staff, and athletes on training-load management. Methods: Online surveys were distributed among professionals and gymnasts involved in rhythmic gymnastics training across the world. One hundred (50 coaches, 12 medical staff, and 38 gymnasts) participants from 25 different countries completed the surveys. Results: Respondents stated using coaches’ perception on a daily basis as a method of monitoring external (57%) and internal (58%) load, recovery/fatigue (52%), and performance (64%). Variables and methods (eg, wearable devices, athlete self-reported measures, session rating of perceived exertion), and metrics (eg, acute and chronic load) commonly reported in the training-load literature and other sports were not frequently used in rhythmic gymnastics. The majority of coaches (60.3% [17%]) perceived that maladaptation rarely or never occurred. Medical staff involvement in sharing and discussing training-load information was limited, and they perceived that the measurement of athletes’ recovery/fatigue was poor. Gymnasts noted good quality in relation to the measurement of performance. Most participants (≥85%) believed that a specific training-load management model for rhythmic gymnastics could be very or extremely effective. Conclusions: In conclusion, rhythmic gymnastics coaches’ perception is the most commonly used strategy to monitor load, recovery/fatigue, and performance; although, this could be a limited method to guarantee effective training-load management in this sport.

scholarly journals Ansiedade pré-competitiva e desempenho em jovens atletas de ginástica rítmica: um estudo de caso

2020 ◽  
Vol 18 (3) ◽  
pp. 25-28
Author(s):  
Camila Mendes Marques ◽  
Shauane Emanuela Fornaciari Silva ◽  
Veronica Volski Mattes ◽  
Ana Carolina Paludo
Keyword(s):  
Descriptive Data ◽  
Cognitive Anxiety ◽  
Rhythmic Gymnastics ◽  
And Performance ◽  
Perception Of Performance

INTRODUÇÃO: A ginástica rítmica é caracterizada pela participação precoce das atletas em treinamento e competição. Essa participação pode causar altos níveis de ansiedade, podendo impactar negativamente no desempenho esportivo.OBJETIVO: Verificar as respostas de ansiedade pré-competitiva e de desempenho em atletas da ginástica rítmica. MÉTODOS: Foram avaliadas 2 atletas de ginástica rítmica, com idade de 11 e 12 anos, nos aparelhos individuais de maças e corda, durante uma competição simulada e uma competição oficial. A ansiedade pré-competitiva foi avaliada pelo questionário CSAI-2R e o desempenho foi avaliado pela percepção da atleta e o score da arbitragem para cada apresentação.RESULTADOS: Os dados descritivos sugerem que na competição oficial, as atletas apresentaram maiores valores de ansiedade somática e cognitiva; seguido de uma maior percepção de desempenho. Para a pontuação da arbitragem, as atletas apresentaram maiores valores para o aparelho maças e menores valores no aparelho corda na competição oficial quando comparado a competição simulada.CONCLUSÃO: Os resultados do presente estudo sugerem que, a ansiedade pré-competitiva tende a ser maior em situações mais estressantes (competição oficial vs. simulada), porém esse comportamento parece não influenciar negativamente o desempenho das ginastas nas apresentações individuais.ABSTRACT. Precompetitive anxiety and performance in young rhythmic gymnastics athletes: a case study.BACKGROUND: Rhythmic gymnastics is characterized by an athlete’s early participation in training and competition. This participation can cause high levels of anxiety and may impact negatively on sports performance.OBJECTIVE: To verify the precompetitive anxiety and performance responses in rhythmic gymnastics athletes.METHODS: Two rhythmic gymnastics athletes, aged 11 and 12 years old, were evaluated in individual clubs and rope apparatus, during a simulated and official competition. Precompetitive anxiety was assessed by CSAI-2R questionnaire, and performance was assessed by the athlete´s perception and jury score for each presentation. RESULTS: The descriptive data suggest that in the official competition, the athletes presented higher values of somatic and cognitive anxiety, followed by a greater perception of performance. For the jury score, the athletes presented higher values in clubs and lower values in the rope apparatus during the official competition than the simulated competition.CONCLUSION: The results of the present study suggest that precompetitive anxiety tends to be higher in more stressful conditions (official vs. simulated competition), but this behavior does not seem to influence the performance of gymnasts in individual presentations negatively.

LEVEL OF FATIGUE IN RHYTHMIC GYMNASTICS AND PERFORMANCE: ELITE VS. NON-ELITE

2013 ◽  
Vol 47 (17) ◽  
pp. e4.8-e4
Author(s):  
M Molina-Reina ◽  
M Hontoria-Galán ◽  
J González-Hernández ◽  
J González-Badillo ◽  
P Jiménez-Reyes
Keyword(s):  
Rhythmic Gymnastics ◽  
And Performance

Transmission Scanning Electron Microscopy and Energy Analysis with the Siemens ELMISKOP 101

1972 ◽  
Vol 30 ◽  
pp. 450-451
Author(s):  
H. M. Thieringer
Keyword(s):  
Objective Lens ◽  
Transmission Microscopy ◽  
Image Recording ◽  
Mode Of Operation ◽  
Scanning Transmission ◽  
Electron Microscopes ◽  
And Performance ◽  
Convergent Beam ◽  
Ray Path ◽  
Beam Diffraction

It has repeatedly been show that with conventional electron microscopes very fine electron probes can be produced, therefore allowing various micro-techniques such as micro recording, X-ray microanalysis and convergent beam diffraction. In this paper the function and performance of an SIEMENS ELMISKOP 101 used as a scanning transmission microscope (STEM) is described. This mode of operation has some advantages over the conventional transmission microscopy (CTEM) especially for the observation of thick specimen, in spite of somewhat longer image recording times.Fig.1 shows schematically the ray path and the additional electronics of an ELMISKOP 101 working as a STEM. With a point-cathode, and using condensor I and the objective lens as a demagnifying system, an electron probe with a half-width ob about 25 Å and a typical current of 5.10-11 amp at 100 kV can be obtained in the back focal plane of the objective lens.

Angular Resolved Electron Spectroscopy with Parallel Recording

1990 ◽  
Vol 48 (2) ◽  
pp. 370-371
Author(s):  
Huang Min ◽  
P.S. Flora ◽  
C.J. Harland ◽  
J.A. Venables
Keyword(s):  
Electron Spectroscopy ◽  
Low Voltage ◽  
Solid Angle ◽  
Detection System ◽  
Voltage Electron ◽  
Cylindrical Mirror ◽  
Inner Radius ◽  
Channel Plate ◽  
And Performance ◽  
Type Detector

A cylindrical mirror analyser (CMA) has been built with a parallel recording detection system. It is being used for angular resolved electron spectroscopy (ARES) within a SEM. The CMA has been optimised for imaging applications; the inner cylinder contains a magnetically focused and scanned, 30kV, SEM electron-optical column. The CMA has a large inner radius (50.8mm) and a large collection solid angle (Ω > 1sterad). An energy resolution (ΔE/E) of 1-2% has been achieved. The design and performance of the combination SEM/CMA instrument has been described previously and the CMA and detector system has been used for low voltage electron spectroscopy. Here we discuss the use of the CMA for ARES and present some preliminary results.The CMA has been designed for an axis-to-ring focus and uses an annular type detector. This detector consists of a channel-plate/YAG/mirror assembly which is optically coupled to either a photomultiplier for spectroscopy or a TV camera for parallel detection.

Novel epoxy/anhydride alternatives for biological electron microscopy: Physical and performance characteristis of embed 812 and LX 112 in combination with NSA/NMA/DMAE

1989 ◽  
Vol 47 ◽  
pp. 1000-1001
Author(s):  
Joe A. Mascorro ◽  
Gerald S. Kirby
Keyword(s):  
Electron Microscopy ◽  
Flow Rate ◽  
Succinic Anhydride ◽  
Volume Flow Rate ◽  
Mass Density ◽  
Uranyl Acetate ◽  
Volume Flow ◽  
Base Resin ◽  
And Performance ◽  
Acid Anhydrides

Embedding media based upon an epoxy resin of choice and the acid anhydrides dodecenyl succinic anhydride (DDSA), nadic methyl anhydride (NMA), and catalyzed by the tertiary amine 2,4,6-Tri(dimethylaminomethyl) phenol (DMP-30) are widely used in biological electron microscopy. These media possess a viscosity character that can impair tissue infiltration, particularly if original Epon 812 is utilized as the base resin. Other resins that are considerably less viscous than Epon 812 now are available as replacements. Likewise, nonenyl succinic anhydride (NSA) and dimethylaminoethanol (DMAE) are more fluid than their counterparts DDSA and DMP- 30 commonly used in earlier formulations. This work utilizes novel epoxy and anhydride combinations in order to produce embedding media with desirable flow rate and viscosity parameters that, in turn, would allow the medium to optimally infiltrate tissues. Specifically, embeding media based on EmBed 812 or LX 112 with NSA (in place of DDSA) and DMAE (replacing DMP-30), with NMA remaining constant, are formulated and offered as alternatives for routine biological work.Individual epoxy resins (Table I) or complete embedding media (Tables II-III) were tested for flow rate and viscosity. The novel media were further examined for their ability to infilftrate tissues, polymerize, sectioning and staining character, as well as strength and stability to the electron beam and column vacuum. For physical comparisons, a volume (9 ml) of either resin or media was aspirated into a capillary viscocimeter oriented vertically. The material was then allowed to flow out freely under the influence of gravity and the flow time necessary for the volume to exit was recored (Col B,C; Tables). In addition, the volume flow rate (ml flowing/second; Col D, Tables) was measured. Viscosity (n) could then be determined by using the Hagen-Poiseville relation for laminar flow, n = c.p/Q, where c = a geometric constant from an instrument calibration with water, p = mass density, and Q = volume flow rate. Mass weight and density of the materials were determined as well (Col F,G; Tables). Infiltration schedules utilized were short (1/2 hr 1:1, 3 hrs full resin), intermediate (1/2 hr 1:1, 6 hrs full resin) , or long (1/2 hr 1:1, 6 hrs full resin) in total time. Polymerization schedules ranging from 15 hrs (overnight) through 24, 36, or 48 hrs were tested. Sections demonstrating gold interference colors were collected on unsupported 200- 300 mesh grids and stained sequentially with uranyl acetate and lead citrate.

Trace nanoanalysis

1994 ◽  
Vol 52 ◽  
pp. 940-941
Author(s):  
D. E. Newbury ◽  
R. D. Leapman
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Detection Efficiency ◽  
Volume Element ◽  
And Performance ◽  
Trace Constituents ◽  
Secondary Ion ◽  
Concentration Levels ◽  
Structure Properties

Trace constituents, which can be very loosely defined as those present at concentration levels below 1 percent, often exert influence on structure, properties, and performance far greater than what might be estimated from their proportion alone. Defining the role of trace constituents in the microstructure, or indeed even determining their location, makes great demands on the available array of microanalytical tools. These demands become increasingly more challenging as the dimensions of the volume element to be probed become smaller. For example, a cubic volume element of silicon with an edge dimension of 1 micrometer contains approximately 5×1010 atoms. High performance secondary ion mass spectrometry (SIMS) can be used to measure trace constituents to levels of hundreds of parts per billion from such a volume element (e. g., detection of at least 100 atoms to give 10% reproducibility with an overall detection efficiency of 1%, considering ionization, transmission, and counting).

Relationship of stress and performance among first-year dental students

1986 ◽  
Vol 50 (5) ◽  
pp. 264-267 ◽  
Author(s):  
GH Westerman ◽  
TG Grandy ◽  
JV Lupo ◽  
RE Mitchell
Keyword(s):  
Dental Students ◽  
First Year ◽  
And Performance ◽  
Relationship Of
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