Benefits of achieving vigorous as well as moderate physical activity recommendations: Evidence from heart rate complexity and cardiac vagal modulation     

Luisa Soares-Miranda  Gavin Sandercock  Susana Vale  Pedro Silva  Carla Moreira  Rute Santos 《Journal of sports sciences》2013,31(10):1011-1018

Abstract

The aim of this study was to examine differences in traditional heart rate variability measurements and heart rate complexity (sample entropy) in young adults grouped by objectively measured achievement of either moderate or both moderate and vigorous physical activity recommendations. Of 168 young adults tested (86 females, 82 males; age 20.5 ± 1.2 years), 119 achieved only recommendations for moderate physical activity (moderate group) and 49 achieved recommendations for both moderate and vigorous physical activity (vigorous group). Analysis of covariance controlling for sex, weekly minutes of moderate physical activity, and percentage of body fat was used to assess between-group differences in heart rate variability and heart rate complexity. Logistic regression analysis was used to determine the group characteristics that best predicted high heart rate complexity and vagal indices of heart rate variability. The majority of the autonomic measures were higher (P < 0.05) in the vigorous group, and regression analysis showed that vigorous physical activity was the only multivariate predictor of higher heart rate complexity and higher heart rate variability. Young adults engaged in regular vigorous physical activity were more than twice as likely to have high heart rate complexity than those involved in predominantly moderate exercise. These findings suggest that vigorous physical activity is more closely associated with high heart rate complexity than moderate physical activity in young adults.  相似文献   

Kinematic differences between front crawl sprint and distance swimmers at a distance pace     

Carla B. McCabe  Ross H. Sanders 《Journal of sports sciences》2013,31(6):601-608

Abstract

The purpose of the study was to determine whether there are differences in kinematics between sprint and distance front crawl specialists when swimming at a distance pace using a six beat kick. Seven sprint and eight distance male specialists performed one maximum 400 m swim through a 6.75 m³ calibrated space recorded by six gen-locked cameras. The following variables were calculated: average swim velocity, stroke length, stroke frequency, upper limb and foot displacement, elbow angle, the shoulder and hip roll angle, duration of the stroke phases and time corresponding to particular events within the stroke cycle relative to hand entry. Differences between the groups were assessed by an independent t-test and effect size (d) calculations for each variable. The groups only differed significantly with respect to the average swim velocity, with the distance swimmers maintaining a greater velocity throughout the 400 m. However, effect sizes were moderate for elbow angle range during the pull phase (d = 0.78) and the total hip roll magnitude (d = 0.76). There was little evidence to suggest that sprint and distance swimmers using a six beat kick pattern differ in technique when swimming at a distance pace and therefore coaches should not encourage the development of different techniques between these groups.  相似文献   

On the Relationship between Objective Measures and Performance in Basketball: Selecting Teams of Seventh Grade Girls     

Calvin P. Garbin  Elba G. Stafford  Carla D. Lowry 《Research quarterly for exercise and sport》2013,84(1):14-20

Abstract

The present study examines the utility of several objective measures to predict which girls were selected for one of six junior high school basketball teams. One purpose of this research was to examine the extent to which differences between coaches' selection strategies might have contributed to the apparently contradictory results among previous attempts to identify correlates of coaches' ratings or team selections. Linear discriminant models of six coaches' team selections were constructed from measures of basketball and athletic skills, strength, physical measures, and competition anxiety obtained during the first week of practice. These models provided greater-than-chance agreement with coaches' player selection for each team (87%–93% correct classification). A cross-modeling procedure revealed that the six coaches' selections could be modeled in terms of one of three approaches to selection: a) Select the aspirants who possess the best basketball skills (three teams), b) select the aspirants with greatest size and strength and least competition anxiety (two teams), and c) select only the aspirants with both types of attributes (one team). The results indicate that it may be difficult to identify a single set of measures to select skillful or potentially skillful basketball players, because of differences in how coaches might choose to define these terms  相似文献   

Evaluierung von Studienpl?nen     

Gerhard Reichmann 《Zeitschrift für Hochschulrecht, Hochschulmanagement und Hochschulpolitik: zfhr》2007,6(2):37-45

Gegenstand des vorliegenden Beitrages ist die Vorstellung eines Projektes zur Evaluierung eines Studienplanes in Form der Ermittlung von Verbesserungsm?glichkeiten hinsichtlich der Studienbedingungen. Evaluiert wird der aktuelle Studienplan für die Studienrichtung Betriebswirtschaft an der Karl-Franzens-Universit?t Graz. Zun?chst werden anhand einer kombinierten offenen und strukturierten Befragung Verbesserungswünsche von Studierenden, die nach diesem Studienplan studieren, gewonnen. Im Anschluss werden jene Verbesserungswünsche identifiziert, die realisierbar erscheinen. Zielsetzung der gegenst?ndlichen Evaluierung ist eine Verbesserung der Studienqualit?t.  相似文献   

Race and Color: Revisiting Perspectives in Black Education     

Carla R. Monroe 《理论付诸实践》2016,55(1):46-53

Racial inequities, such as systematic disparities in school discipline and achievement outcomes, are a perennial characteristic of public education in the United States. Although attention to interracial chasms such as the Black–White achievement gap is common, limited efforts are devoted to understanding how and why colorism motivates imbalances within communities of color. In this article, I outline how the color complex relates to racial battles and social perspectives within the nation's educational system. Recommendations for altering problematic norms are presented.  相似文献   

The interplay between subjective abilities and subjective demands and its relationship with academic success. An application of the person–environment fit theory     

Carla Bohndick  Tom Rosman  Susanne Kohlmeyer  Heike M. Buhl 《Higher Education》2018,75(5):839-854

In this study, we draw on person–environment fit theory to analyze whether academic success is best explained by individual abilities subjectively exceeding situational demands or by abilities matching the demands. Moreover, we disentangled effects of perceived abilities and subjective person–environment (P-E) fit on academic success. All in all, 693 teacher education students participated in an online questionnaire. Students were asked to rate general requirements of their academic programs (e.g., self-discipline) on a 5-point scale in terms of (1) their own abilities and (2) the perceived relevance for their studies. P-E fit was determined by difference scores between abilities and relevance ratings. Academic success was assessed by grades, perceived performance, and study satisfaction. Data were analyzed through structural equation modeling and suggest that academic success is best explained by a match between abilities and demands. Moreover, all three criteria for academic success were more strongly related to subjective fit than to subjective abilities.  相似文献   

Effect of visual-spatial ability on medical students' performance in a gross anatomy course     

Lufler RS  Zumwalt AC  Romney CA  Hoagland TM 《Anatomical sciences education》2012,5(1):3-9

The ability to mentally manipulate objects in three dimensions is essential to the practice of many clinical medical specialties. The relationship between this type of visual-spatial ability and performance in preclinical courses such as medical gross anatomy is poorly understood. This study determined if visual-spatial ability is associated with performance on practical examinations, and if students' visual-spatial ability improves during medical gross anatomy. Three hundred and fifty-two first-year medical students completed the Mental Rotations Test (MRT) before the gross anatomy course and 255 at its completion in 2008 and 2009. Hypotheses were tested using logistic regression analysis and Student's t-test. Compared with students in the lowest quartile of the MRT, students who scored in the highest quartile of the MRT were 2.2 [95% confidence interval (CI) 1.2 and 3.8] and 2.1 (95% CI 1.2 and 3.5) times more likely to score greater than 90% on practical examinations and on both practical and written examinations, respectively. MRT scores for males and females increased significantly (P < 0.0001). Measurement of students' pre-existing visual-spatial ability is predictive of performance in medical gross anatomy, and early intervention may be useful for students with low visual-spatial ability on entry to medical school. Participation in medical gross anatomy increases students' visual-spatial ability, although the mechanism for this phenomenon is unknown.  相似文献   

Infusing two models of evaluation into a military environment: A case study     

Wayne Aaberg  Carla J. Thompson 《Performance Improvement》2012,51(1):17-25

Determining the worth and effectiveness of training used within a military environment is the same accountability responsibility that educational organizations, businesses, and social agencies are charged with for improving programs and services to society. The need for accountability implies the process of evaluation, particularly in governmental training programs. This article provides a case study, blueprint, and action plan for the infusion of two evaluation models as the foundation for determining the effectiveness of training within a military application.  相似文献   

A bug's life: change and transformation in early modern China     

Nappi C 《Endeavour》2007,31(4):124-128

Chanting wasps and shape-shifting worms were all in a day's work for sixteenth-century Chinese naturalists such as Li Shizhen (1518-1593). In an effort to understand the metamorphoses of both nature and the human body, he and other early modern Chinese scholars looked towards tiny creatures like roundworms, lice and demon bugs. For them, such animals could reveal the most intimate secrets of the universe.  相似文献   

Identification and Characterization of a Novel Plasmid-Encoded Laccase-Like Multicopper Oxidase from Ochrobactrum sp. BF15 Isolated from an On-Farm Bio-Purification System     

María Carla Martini  Francesca Berini  Luka Ausec  Carmine Casciello  Carolina Vacca  Mariano Pistorio  Antonio Lagares  Ines Mandic-Mulec  Flavia Marinelli  María Florencia Del Papa 《Food Technology and Biotechnology》2021,59(4):519

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