46 research outputs found
[[alternative]]Performance of standing long jump and its correlates among
No full text[[abstract]]Performance of standing long jump and its correlates among
male children in later childhood
Master’s Thesis,2004 Chun-chich Wang
Advisor: Junling Jwo, Ph.D.
Abstract
Fundamental movement performance is the product of the interaction of many factors. According to the constraints model, the movement can be influenced by factors of individual constraints, environmental constraints, and task constraints, and there are probably close relationships between individual factors and performance of standing long jump (SLJ). The main purpose of this study was to investigate the performance of SLJ and its correlates among male children in later childhood. Seven selected individual factors, pattern of SLJ, leg strength, leg length, body mass index (BMI), and the flexibility of hip, knee, and ankle were examined its relationships with and predictors for SLJ’s performance. One hundred and twenty-one participants, whose mean age were 11.7 years (SD = 0.6 years), were measured for the seven individual factors, the SLJ performance, and SLJ pattern. Total body approach was used to analyze SLJ pattern. The inter-rater reliability was .85; the intra-rater reliability was .90. The Stepwise Regression analyses showed that: (1) SLJ’s performance was positively correlated with the level of SLJ (r = .79, p < .05), leg strength (r = .33, p < .05), the flexibility of hip (r = .34, p < .05), knee (r = .48, p < .05), and ankle(r = .22, p < .05), SLJ’s performance was negatively correlated with BMI (r = -.41, p < .05), and (2) SLJ’s pattern, the flexibility of hip, and knee accounted for 69% of the SLJ’s performance variance. Therefore, it was concluded that, among children in later childhood, (1) the factors of the level of SLJ, leg strength, BMI, the flexibility of hip, knee, and ankle were correlated with SLJ’s performance, and (2) SLJ’s pattern, the flexibility of hip and knee were the predictors of SLJ’s performance.
Key words: constraints model, later childhood, standing long
jump, movement patterns, individual factors.
Neonatal and childhood teeth in relation to in utero exposure to PCBs/PCDFs- The observations from Yucheng children in Taiwan.
No full text[[alternative]]Reliability Of Selected Lower Limb Joint Kinetic Parameter
No full text[[abstract]]In the past, many biomechanical studies were constrained by cost, time, and equipments. One of these factors can lead to poor research directly or indirectly. If researches are not sensitive to the statistical power, it may lead to support null hypothesis and claim the result is demonstrating by the treatments or conditions had the effect. The purpose of this study was to (1) find out every coefficient of variation (CV) of selected kinematic and kinetic parameters on lower limb joint of children during vertical jump (VJ) and standing long jump (SLJ). (2) determine the appropriate number of trials to establish a stable mean and reliability of selected kinetic parameters on lower limb joint of children during VJ and SLJ. Thirty primary school students were selected as subject( In VJ, N=14, age 12.1±0.8 years, height 153.1±6.9 cm ,weight 50.9±12.4 kg; In SLJ, N=16, age 11.4±0.5 years, height 143.7±11.9 cm ,weight 37.4±12.6 kg) to perform 25 trials of maximum VJ or SLJ. One Kistler force plate (600Hz) and one JVC digital camera (60Hz) were used to collect the data. The peak moment and power of lower limb joint were calculated by inverse dynamic method. Sequential estimation technique was used to determine the optimum number of trials. Based on the results of this study (1) In VJ, the most CV of kinetic parameters were bigger than kinematics’. ( not including the horizontal speed of center of gravity of takeoff ) And the kinetic parameter, power of hip joint, was the biggest. (2) In SLJ, the most CV of kinetic parameters were bigger than kinematics’. And the kinetic parameter, power of knee joint, was the biggest. (3) the best number of trials was suggested at least 13-trial for VJ and 14-trial for SLJ by Sequential estimation procedure. Therefore, in order to get a stable mean for kinetic variables, a multiple-trial protocol needed to be adopted.
Self-healing capability of novel eco-epoxy adhesives based on the modified tannic acid on Al adherends tested in a single lap joint
No full textThe aim of this paper is to study the self-healing capability of fractured Al joints bonded with novel eco-epoxide adhesives synthesized from a bio-renewable raw material (tannic acid – TA). Two synthesized eco-epoxy components based on TA, (A) glycidyl ether and (B) glycidyl phosphate ester of TA, were used as a replacement for the toxic epoxy component based on Bisphenol A. The effect of the eco-epoxy components on the self-healing capability was measured as a recovery of shear strength in a single lap joint (SLJ) test after complete failure, which was compared to the reference epoxy (R). The self-healing procedure was performed in an autoclave at 180 °C for 2 h and 2 bars. A combination of two monitoring techniques, Digital Image Correlation (DIC) and Acoustic Emission (AE), was used to monitor the strain distribution and damage propagation in the SLJ. The measured shear stress of A and B adhesives in the SLJ had values in the range of 2.3–5.1 MPa. A fracture analysis showed complete adhesive failure for all the tested adhesives, which was not affected by the self-healing process. Out of all adhesives, only the A adhesive demonstrated the capability to heal. The recovery of the shear strength for adhesive A was higher than 50% of the virgin case. In addition, the AE analysis managed to capture a clear distinction between the signals for the virgin and the self-healed tests for adhesive A. Results obtained in this study highlighted the promising potential of using bio-based epoxy adhesives in structural adhesive bonding with the possibility of using self-healing in the recovery of the strength of such bonded joints.Aerospace Structures & Computational MechanicsStructural Integrity & Composite
Mooting: An Undergraduate’s Perspective
Full text linkMooting is the tried and tested method of legal education of preparing law students for practice. It is to many law firms and chambers as essential to employability as the degree itself. It exists as a test of a future trainee or pupil\u27s advocacy, communication, and research skills. With the advent of legal advice clinics in universities, the status of moots as an effective form of practical legal education has been brought into question. Arguably, however, this claim is unfounded. The essential value of mooting is expanded upon through this article by the author\u27s own anecdotal experiences as a mooter both at the national and international level
RESEARCH ON THE STRENGTH OF METAL ADHESIVELY BONDED OF SINGLE LAP JOINTS BASED ON SINGULARITY THEORY
No full textIn order to study the influence of different metal materials on the strength of adhesively-bonded single lap joints（ SLJ）,The adhesive bonding of SLJs whose adherends were aluminum alloy,titanium alloy,copper alloy and cold rolled steel were separately tested under tension-shear loading in ANSYS software based on singularity theory. The results show that the singularity order and stress intensity factor of adhesive joints decreased with the elasticity modulus increasing,the strength of adhesive joints increased with the elasticity modulus increasing
50 Minute Zoom Critique On Ten Pages of Any Writing OR Career Advice from Hillary Homzie
No full textHollins Children’s Literature & Writing faculty member Hillary is the author of many books for children, including the Ellie May chapter books, a SLJ Webcast featured selection, and Queen of Likes, which was optioned by Priority Pictures and is a PJOur Way selection. Her latest project, the Kate the Chemist Middle Grade series, was recently featured on the Today Show. Using her experience as a sketch comedian in NYC, Hillary enjoys teaching students how to add levity and to find their own voice. The New York Times called her teaching “very attentive and appreciative and encouraging.” Hillary coordinates the internship programs for Arts & Humanities at Sonoma State University, where she is on the faculty. http://hillaryhomzie.com/. Bid on the chance to get excellent advice and feedback from a wonderful author and teacher!
Minimum Bid: $20https://digitalcommons.hollins.edu/fbc2020_auction/1022/thumbnail.jp
A study to examine the validity and reliability of a selected group of physical fitness tests within a primary school setting
Full text linkPurpose: This study represents an effort to provide an evidence-based approach to selecting field-based fitness measures for children and youth for inclusion in a test battery to be used within the school setting. The approach used by the author considers the following criteria to determine which youth fitness test items would be most appropriate for inclusion: (1) the strength of the fitness tests' association with health markers in youth, (2) the fitness tests integrity (validity and reliability), (3) the relative feasibility of the test administration in the field and (4) the measurement error of the fitness test. This study aims to identify valid and reliable physical fitness tests with low measurement errors for use in South African schools Method: A literature review was performed to determine the predictive and criterion validity of physical fitness tests in children. Tests with strong predictive evidence and good criterion validity were selected for further reliability testing. A group of 290 male and female children aged 6 to 13 years performed a physical fitness testing protocol three times within a 7-day period. The typical error of measurement (TE), coefficient of variation (CVTE) and smallest worthwhile change (SWC) were calculated for each sex and age group (grade). Changes in measurement were categorised as small, medium or large based on effect sizes. Results: The 20m shuttle run (SRT), hand grip strength (HGS), standing long jump (SLJ), body mass index (BMI), and waist circumference (WC) tests demonstrate strong predictive evidence and good criterion validity. Typical error for the 20mSRT was 0.9 stages. Small changes in 20mSRT (0.4 stages) are challenging for the test to detect. Medium (1.0 stages) and large (1.9 stages) changes in the 20mSRT are more interpretable as they exceed the “noise” (TE) of the measurement. Small (0.6 kg/m2), medium (1.6 kg/m2) and large (2.5 kg/m2) changes in BMI are all larger than the TE (0.2 kg/m2). The BMI test has a ‘good' ability to detect small, medium and large changes. TE for HGS was 1.3 kg. Small changes in HGS (1.3kg) are difficult for the HGS test to detect. Medium (3.3kg) and large (5.3kg) changes in HGS are more interpretable as they exceed the “noise” (TE) of the measurement. The WC test has a ‘good' ability to detect small (1.5 cm), medium (3.8 cm) and large (6.1 cm) changes as they are larger than the TE (1.5 cm). TE for SLJ was 8.8 cm. Small changes in SLJ (5.4 cm) are difficult for the SLJ test to detect. Medium (13.5 cm) and large (21.5 cm) changes in SLJ are more interpretable as they exceed the “noise” (TE) of the measurement. Conclusion: The field-based physical fitness tests that demonstrated strong predictive validity and good criterion validity from the literature and low measurement error from the reliability data are HGS, SLJ, BMI, WC and 20mSRT. These fitness tests could be included in a battery of tests for implementation within the school setting. Researchers and practitioners can use the SWC and TE as guidelines to set targets when determining the extent to which performance changes in these fitness tests are practically significant
La relación entre el índice de Masa Corporal con la fuerza explosiva de miembros inferiores en varones entre los 12-17 años en el municipio de Chía después de la pandemia Covid-19
No full textIntroducción: Diferentes argumentos científicos han demostrado la capacidad predictiva e indicadora de las pruebas de condición física y el índice de masa corporal (IMC). Así mismo, las relaciones que tienen dichas variables entre si. Objetivo: Determinar la correlación entre el IMC con la fuerza explosiva de los miembros inferiores mediante el test de salto horizontal (SLJ) en adolescentes varones entre los 12 y 17 años perteneciente a las escuelas de formación deportiva del municipio de Chía. Metodología: Estudio con un diseño cuantitativo, de alcance descriptivo de corte transversal, no experimental. Se evaluaron 101 varones entre los 12 a 17 años de edad inscritos en las escuelas de formación del municipio. Se utilizó el índice de correlación de Pearson para correlacionar los resultados del test salto horizontal (cm) y el índice de masa corporal (kg/m2). Resultados: IMC (kg/m2) para la edad 12 años: 21.05 (2.41), 13 años: 19.3 (1.91), 14 años: 20.93 (4.01), 15 años: 20.22 (3.05), 16 años: 22.19 (4.36) 17 años: 21.24 (3.18). SLJ (cm) para la edad. 12 años: 124.44 (16.85), 13 años: 141.9 (19.76), 14 años: 159.8 (21.62), 15 años: 162.86 (29.24), 16 años: 164.77 (36.23) 17 años: 187.14 (22.47). Índice de correlación de Pearson. 12 años: -0.226, 13 años: 0.104, 14 años: -0.536, 15 años: -0.335, 16 años: -0.277, 17 años: -0.138. Conclusiones: No existe una relación significativa entre los valores obtenidos en el test SLJ y el IMC en los varones evaluados. Los valores del SLJ incrementan de acuerdo a la edad mientras que el IMC no posee un comportamiento lineal. Palabras clave: Fuerza explosiva, IMC, Pearson, adolescentes, salud, condición física.Introduction: Different scientific arguments have demonstrated the predictive and indicative capacity of physical fitness tests and body mass index (BMI). Likewise, the relationships that these variables have with each other. Objective: To determine the correlation between the BMI and the explosive strength of the lower limbs by means of the horizontal jump test (SLJ) in male adolescents between 12 and 17 years old belonging to sports training schools in the municipality of Chía. Methodology: Study with a quantitative design, with a cross-sectional descriptive scope, not experimental. 101 males between 12 and 17 years of age enrolled in the training schools of the municipality were evaluated. Pearson's correlation index was used to correlate the results of the horizontal jump test (cm) and the body mass index (kg/m2). Results: BMI (kg/m2) for age 12 years: 21.05 (2.41), 13 years: 19.3 (1.91), 14 years: 20.93 (4.01), 15 years: 20.22 (3.05), 16 years: 22.19 (4.36) 17 years: 21.24 (3.18). SLJ (cm) for age. 12 years: 124.44 (16.85), 13 years: 141.9 (19.76), 14 years: 159.8 (21.62), 15 years: 162.86 (29.24), 16 years: 164.77 (36.23) 17 years: 187.14 (22.47). Pearson's correlation index. 12 years old: -0.226, 13 years old: 0.104, 14 years old: -0.536, 15 years old: -0.335, 16 years old: -0.277, 17 years old: -0.138. Conclusions: There is no significant relationship between the values obtained in the SLJ test and the BMI in the males evaluated. The SLJ values increase according to age while the BMI does not have a linear behaviorIncluye bibliografíaPregradoProfesional en Ciencias del DeporteCiencias del Deport
Fitness promotion in college: the relationships among students’ perceived physical literacy, knowledge, and physical fitness
Full text linkPurpose: The purpose of this study was to examine the relationships among perceived physical literacy (PPL), knowledge of physical activity and fitness (PAF knowledge), and physical fitness. Methods: Undergraduates (N = 968, female = 414; Mage = 18.64) from a public university in central China completed a simplified Chinese version of the PPL instrument, an online test for PAF knowledge, and seven health-related physical fitness tests. The PPL includes three dimensions: (a) confidence and physical competence, (b) motivation, and (c) interaction with the environment. The fitness tests measured lung capacity, body mass index (BMI), and performances in 800 (female)/1000 (male) meters run, 50 meters dash (50 M), sit-up (female) / pull-up (male), standing long jump (SLJ), and sit-and-reach. Results: PPL and its dimensions significantly predicted six fitness test performances both in male (β: −0.42 – 0.37; p \u3c 0.01–0.05; R2: 0.01–0.13) and female (β: −0.59 – 0.49; p \u3c 0.01–0.05; R2: 0.03–0.13) students. PAF knowledge (β: −0.17 – 0.18; p \u3c 0.01–0.05; R2: 0.01–0.05) significantly predicted BMI (males) and performances in 50 M (females) and SLJ (females) tests. Conclusion: To support college students’ fitness development and maintenance, tailored physical activity and fitness promotion programs are needed to strengthen students’ PPL and PAF knowledge
