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Research Quarterly for Exercise and Sport

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https://www.readbyqxmd.com/read/28402178/top-10-research-questions-related-to-youth-aerobic-fitness
#1
Neil Armstrong
Peak oxygen uptake ([Formula: see text]2) is internationally recognized as the criterion measure of youth aerobic fitness, but despite pediatric data being available for almost 80 years, its measurement and interpretation in relation to growth, maturation, and health remain controversial. The trainability of youth aerobic fitness continues to be hotly debated, and causal mechanisms of training-induced changes and their modulation by chronological age, biological maturation, and sex are still to be resolved...
April 12, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28388362/sedentary-behavior-and-health-broadening-the-knowledge-base-and-strengthening-the-science
#2
Nyssa Hadgraft, Neville Owen
We provide an overview of a recently published, edited book in a rapidly emerging field of research, policy, and practice for physical activity: Sedentary Behavior and Health. In this commentary, we highlight the broad perspectives provided in the 27 chapters of Sedentary Behavior and Health and suggest a research strategy to move the field forward-not only with scientific rigor, but also with breadth of scholarship. The book's chapters provide an overview of the background to and contexts for sedentary behavior and health...
April 7, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28388333/blunted-myoglobin-and-quadriceps-soreness-after-electrical-stimulation-during-the-luteal-phase-or-oral-contraception
#3
Lindsey J Anderson, Lucinda L Baker, E Todd Schroeder
PURPOSE: Acute muscle damage after exercise triggers subsequent regeneration, leading to hypertrophy and increased strength after repeated exercise. It has been debated whether acute exercise-induced muscle damage is altered under various premenopausal estrogen conditions. Acute contraction-induced muscle damage was compared during exogenous (oral contraceptive, OC), endogenous (luteal phase, HI), or low (menses, LO) estrogen in healthy young women aged 21 to 30 years old. METHODS: Women (OC, n = 9; HI, n = 9; LO, n = 8; total N = 26) performed 1 neuromuscular electrical stimulation (NMES) bout...
April 7, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28388290/the-role-of-postural-support-in-young-adults-control-of-stationary-kicking
#4
Ben Sidaway, Matthew Bouchard, Julie Chasse, Jonathan Dunn, Andrea Govoni, Breanne McPherson, Katherine Roy, David I Anderson
PURPOSE: The requirement for postural stability during the performance of motor skills has been clearly demonstrated in infants, but the necessity for such a postural substrate is not well documented in adults. The present study investigated the role of postural stability during a ballistic ball-kicking task in adults by providing varying degrees of external postural support. METHOD: In the 1st experiment, 30 participants performed 20 maximal-velocity kicks under each of 3 conditions: grasping a rigid stable handle, light fingertip touch, and grasping a suspended elastic tube...
April 7, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28362223/examining-the-error-of-mis-specifying-nonlinear-confounding-effect-with-application-on-accelerometer-measured-physical-activity
#5
Paul H Lee
PURPOSE: Some confounders are nonlinearly associated with dependent variables, but they are often adjusted using a linear term. The purpose of this study was to examine the error of mis-specifying the nonlinear confounding effect. METHODS: We carried out a simulation study to investigate the effect of adjusting for a nonlinear confounder in the estimation of a causal relationship between the exposure and outcome in 3 ways: using a linear term, binning into 5 equal-size categories, or using a restricted cubic spline of the confounder...
March 31, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28362217/can-graduated-compressive-stockings-reduce-muscle-activity-during-running
#6
Ángel Gabriel Lucas-Cuevas, José Ignacio Priego Quesada, José Vicente Giménez, Inmaculada Aparicio, Juan Manuel Cortell-Tormo, Pedro Pérez-Soriano
PURPOSE: Graduated compressive stockings (GCS) have been suggested to influence performance by reducing muscle oscillations and improving muscle function and efficiency. However, no study to date has analyzed the influence of GCS on muscle activity during running. The objective of the study was to analyze the influence of GCS on the perception of comfort and muscle activation of the main muscles of the lower leg during running. METHOD: Thirty-six participants ran on a treadmill with (GCS) or without (control) GCS...
March 31, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28362163/ties-that-bond-youth-sport-as-a-vehicle-for-social-identity-and-positive-youth-development
#7
Mark W Bruner, Shea M Balish, Christopher Forrest, Sarah Brown, Kristine Webber, Emily Gray, Matthew McGuckin, Melanie R Keats, Laurene Rehman, Christopher A Shields
An emerging area of research has focused on understanding how the group dynamics of a sport team influence positive youth development (PYD). The identities that youth form through their membership in sport teams (i.e., social identities) have been found to influence teammate behavior and team performance. Yet, minimal work exists on social identity and PYD in youth sport. PURPOSE: The purpose of this study was to investigate the relationship between social identity and PYD in sport. METHOD: Youth engaged in recreational sport (N = 219; Mage = 11...
March 31, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28339350/the-effect-of-initial-knee-angle-on-concentric-only-squat-jump-performance
#8
Lachlan J Mitchell, Christos K Argus, Kristie-Lee Taylor, Jeremy M Sheppard, Dale W Chapman
PURPOSE: There is uncertainty as to which knee angle during a squat jump (SJ) produces maximal jump performance. Importantly, understanding this information will aid in determining appropriate ratios for assessment and monitoring of the explosive characteristics of athletes. METHOD: This study compared SJ performance across different knee angles-90º, 100º, 110º, 120º, 130º, and a self-selected depth-for jump height and other kinetic characteristics. For comparison between SJ and an unconstrained dynamic movement, participants also performed a countermovement jump from a self-selected depth...
March 24, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28332935/correction-to-computerized-agility-training-improves-change-of-direction-and-balance-performance-independently-of-footwear-in-young-adults
#9
Max R Paquette, Brian K Schilling, Joshua D Bravo, Shelby A Peel, Yuhua Li, Robert J Townsend
No abstract text is available yet for this article.
March 23, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28332919/the-attention-window-a-narrative-review-of-limitations-and-opportunities-influencing-the-focus-of-attention
#10
Stefanie Hüttermann, Daniel Memmert
PURPOSE: Visual attention is essential in many areas ranging from everyday life situations to the workplace. Different circumstances such as driving in traffic or participating in sports require immediate adaptation to constantly changing situations and frequently the conscious perception of 2 objects or scenes at the same time. METHOD: The attention window task, a measure of attentional breadth, in which people must attend to 2 equally attention-demanding stimuli simultaneously, was introduced...
March 23, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28328311/effect-of-active-lessons-on-physical-activity-academic-and-health-outcomes-a-systematic-review
#11
Rosemarie Martin, Elaine M Murtagh
PURPOSE: The purpose of this study was to conduct a systematic review of classroom-based physical activity interventions that integrate academic content and assess the effectiveness of the interventions on physical activity, learning, facilitators of learning, and health outcomes. METHOD: Six electronic databases (ERIC, PubMed, Google Scholar, Science Direct, Cochrane Library, and EMBASE) and reference lists were searched for English-language articles, published January 1990 through March 2015, reporting classroom-based interventions that deliberately taught academic content using physically active teaching methods for at least 1 week duration, with physical activity, health, learning, or facilitators-of-learning outcomes...
March 22, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28272998/assessing-fat-mass-of-adolescent-swimmers-using-anthropometric-equations-a-dxa-validation-study
#12
Gabriel Lozano-Berges, Alejandro Gómez-Bruton, Ángel Matute-Llorente, Cristina Julián-Almárcegui, Alba Gómez-Cabello, Alejandro González-Agüero, José A Casajús, Germán Vicente-Rodríguez
PURPOSE: The aim of the present study was to determine which of the published anthropometric equations is the most appropriate to estimate body-fat percentage (BF%) in adolescent swimmers. METHOD: Eighty-eight swimmers (45 boys, 43 girls) participated in this study. Following the recommendations of the International Society of the Advancement of Kinanthropometry, biceps, triceps, subscapular, iliac-crest, supraspinale, front-thigh, and medial calf skinfold thicknesses were measured...
March 8, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28151087/effects-of-isometric-hand-grip-muscle-contraction-on-young-adults-free-recall-and-recognition-memory
#13
Phillip D Tomporowski, Chelesa Albrecht, Daniel M Pendleton
PURPOSE: The purpose of this study was to determine if physical arousal produced by isometric hand-dynamometer contraction performed during word-list learning affects young adults' free recall or recognition memory. METHOD: Twenty-four young adults (12 female; Mage = 22 years) were presented with 4 20-item word lists. Moderate arousal was induced in 12 adults by an initial 30-s maximal hand-dynamometer squeeze with force productions of 50% maximum; low arousal was induced in 12 adults by an initial 1-s maximal dynamometer squeeze with force production of 10% maximum during learning...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28151062/a-content-analysis-of-physical-activity-in-tv-shows-popular-among-adolescents
#14
Megan S Gietzen, Sarah E Gollust, Jennifer A Linde, Dianne Neumark-Sztainer, Marla E Eisenberg
PURPOSE: Previous research has demonstrated that television has the potential to influence youth behaviors, but little evidence exists on how television depicts physical activity (PA), an important public health priority for youth. This mixed-methods study investigated depictions of television characters' participation in PA in the top 25 favorite shows ranked by a diverse sample of 2,793 adolescents. METHOD: Randomly selected episodes from each show were content-analyzed for PA incidents, reasons, and context and in relation to the gender and weight status of participating characters...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28129075/associations-between-self-control-practice-and-skill-level-in-sport-expertise-development
#15
Rafael A B Tedesqui, Bradley W Young
PURPOSE: The purpose of this study was to test the association between self-control (SC) variables and (a) sport-specific practice amounts, (b) engagement in various practice contexts, (c) threats to commitment to one's sport, and (d) skill development using the Brief Self-Control Scale (BSCS) in a diverse sport sample. METHOD: Two hundred forty-four athletes (47% female; Mage = 21.96 years, SD = 6.98 years; 68.8% individual sports and 31.2% team sports; 13...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28129070/can-policy-alone-stop-decline-of-children-and-youth-fitness
#16
Chunhua Zhang, Yang Yang
Various models and methods have been proposed to address the worldwide decline in children's and youth's physical fitness, and the social-ecological model has shown some promise. Yet, the impact of the policy intervention, 1 component of that model, has not been evaluated carefully. Using limited data from policy documents, the impact of policy related to children and youth fitness in China was examined, and it was found that the policy alone did not seem to work. Possible reasons are explored, and a call for more policy evaluation research is made...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28129048/physical-inactivity-obesity-and-type-2-diabetes-an-evolutionary-perspective
#17
S Boyd Eaton, Stanley B Eaton
Physical inactivity (and unhealthy nutrition) has distorted body composition and, in turn, reordered the proportions of myocyte and adipocyte insulin receptors. Insulin acting on adipocyte receptors produces less glucose uptake than does comparable interaction with myocyte receptors. Accordingly, in individuals with disproportionate muscle/fat composition, any given glucose load requires greater-than-normal pancreatic insulin secretion for adequate disposal. This hyperinsulinemia then becomes the leading cause of type 2 diabetes (T2DM) as insulin-sensitive tissues become desensitized...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28075713/an-activist-approach-to-sport-meets-youth-from-socially-vulnerable-backgrounds-possible-learning-aspirations
#18
Carla Luguetti, Kimberly L Oliver, Luiz Eduardo Pinto Basto Tourinho Dantas, David Kirk
PURPOSE: This study was a 2-phase activist research project aimed at co-creating a prototype pedagogical model for working with youth from socially vulnerable backgrounds in a sport context. This article addresses the learning aspirations (learning outcomes) that emerged when we created spaces for youth to develop strategies to manage the risks they face in their community. METHOD: This study took place in a socially and economically disadvantaged neighborhood in a Brazilian city where we worked with a group of 17 boys aged 13 to 15 years old, 4 coaches, a pedagogic coordinator, and a social worker...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28075709/the-influence-of-exercise-intensity-on-postexercise-baroreflex-sensitivity
#19
Linda J Reynolds, Mark B A De Ste Croix, David V B James
PURPOSE: The purpose of this study was to investigate the influence of exercise intensity on postexercise supine and tilt baroreflex sensitivity (BRS). METHOD: Nine healthy, active men performed 2 conditions of interval cycling of 40% maximal work rate (WRmax) and 75% WRmax of matched work done and a control condition of no exercise in a counterbalanced order. BRS outcome measures were determined at preexercise and postexercise up to +24 hr in supine and tilt positions...
March 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28075705/tracking-of-gross-motor-coordination-from-childhood-into-adolescence
#20
Rodrigo Antunes Lima, Anna Bugge, Karin Allor Pfeiffer, Lars Bo Andersen
PURPOSE: The purpose of this study was to analyze tracking and stability of motor coordination in children from age 6 years to ages 9 and 13 years. METHOD: Data were from the Copenhagen School Child Intervention Study. Motor coordination (MC) was measured using the körperkoordinationstest für Kinder (KTK) test. The crude performance score on every item was converted into a standardized "score" based on the original German reference study, which was used to generate a total standardized motor coordination (MQ) score...
March 2017: Research Quarterly for Exercise and Sport
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