Heart rate recovery after aerobic and anaerobic tests: is there an influence of anaerobic speed reserve?     

Sebastián Del Rosso  Fabio Y. Nakamura 《Journal of sports sciences》2017,35(9):820-827

The present study assessed if differences in the metabolic profile, inferred from the anaerobic speed reserve (ASR), would influence the dynamics of heart rate recovery (HRR) after two modes of exercise. Thirty-nine physical education students (14 females and 25 males) volunteered for this study. Participants carried out three separate testing sessions to assess maximal sprinting speed (MSS, 1st session), repeated sprint ability (RSA, 2nd session) and maximal aerobic speed (MAS) using the Université of Montreal Track Test (UMTT, 3rd session). ASR was defined as the difference between MSS and MAS. Heart rate was continuously registered throughout the tests and during the 5-min post-test recovery. To evaluate the influence of ASR on post-exercise, HRR comparisons between ASR-based groups [high ASR vs. low ASR] and sex groups (males vs. females) were performed. Significant differences (P < 0.05) were found between high ASR and low ASR groups of the same sex for indices of relative HRR after the RSA and UMTT. In addition, after the RSA test, males from the high ASR group had a significantly slower HRR kinetics compared with the males of the low ASR (P < 0.05) and the females of high ASR (P < 0.05); whereas females of the high ASR groups had a faster HRR kinetics compared with the females of low ASR group (P < 0.05). Our results showed that in males, post-exercise HRR could be related to the ASR, whereas in females, the influence of ASR is less clear.  相似文献   

A model for assessing the coherence of companies’ knowledge strategy     

Alberto F?De Toni  Fabio?NoninoEmail author  Matteo?Pivetta 《知识管理研究与实践》2011,9(4):327-341

This paper proposes a strategic model for assessing the coherence between companies’ knowledge strategies and their business strategies as well as in their competitive and organisational contexts. In analysing knowledge management literature, we locate three principal strategies: (1) knowledge development (internal or external), (2) knowledge sharing (codification or personalisation) and (3) knowledge exploitation (internal or external). We then position the three strategies and six related policies in the context-content-process dimensions of Pettigrew's model to create a useful framework for strategic analysis and a model to assess the coherence of companies’ knowledge strategy. The model can be used to evaluate how an existing knowledge strategy aligns with a company's characteristics and to formulate and implement a coherent knowledge strategy based on the current competitive environment, organisational context and business strategy.  相似文献   

Mineralogical-chemical Alteration and Origin of Ignimbritic Stones Used in the Old Cathedral of Nostra Signora di Castro (Sardinia,Italy)     

Stefano Columbu  Anna Gioncada  Marco Lezzerini  Fabio Sitzia 《文物保护研究》2013,58(7):397-422

ABSTRACT

The pyroclastic rocks belonging to the Late Eocene-Miocene volcanic activity that occurred in Sardinia between 38 and 15 Ma ago were widely used as construction materials in several Romanesque churches of the easternmost Logudoro area, as well as in large parts of the Sardinia territory. In this work, the ancient Cathedral of Nostra Signora di Castro (twelfth century) was taken as a representative case study. There is no historical or archaeological evidence of ancient quarries. Based on the geochemical, petrographic, and volcanological data on several samples from an extensive field area (approximately 150?km²), a geographical zoning of the volcanics has been recognised. In the Oschiri sector, there are three different sub-zones, which can be identified with different volcanic rocks: less fractionated rocks (Differentation Index ～70–78); intermediately fractionated rocks (D.I. ～76–79); and more fractionated rocks (D.I. ～77–82). To identify the origin of the ignimbrite rocks of the Church of Nostra Signora di Castro, two statistical methods were used: stepwise linear discriminant and canonical analysis. Moreover, to define the geochemical transformation processes induced by the alteration, a comparative study of concentrations of major and trace elements measured by XRF and SEM-EDX analyses on the surface portion and the innermost areas of the stone was made.  相似文献   

An electromyographic comparison of a modified version of the plank with a long lever and posterior tilt versus the traditional plank exercise     

Brad J. Schoenfeld  Bret Contreras  Gul Tiryaki-Sonmez  Jeffrey M. Willardson  Fabio Fontana 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):296-306

The purpose of the study was to compare core muscle activation of the tradition prone plank with a modified version performed with a long-lever and posterior-tilt using surface electromyography. To further determine if a specific component of this modified plank was more effective than the other in enhancing muscle activity, the plank with a long lever and the plank with a posterior pelvic tilt were studied individually. Nineteen participants performed all four variations of the plank for 30 seconds in a randomized order with 5-minute rest between exercise bouts. Compared to the traditional prone plank, the long-lever posterior-tilt plank displayed a significantly increased activation of the upper rectus abdominis (p < 0.001), lower abdominal stabilizers (p < 0.001), and external oblique (p < 0.001). The long-lever plank showed significantly greater activity compared to the traditional plank in the upper rectus abdominis (p = 0.015) and lower abdominal stabilizers (p < 0.001), while the posterior tilt plank elicited greater activity in the external oblique (p = 0.028). In conclusion, the long-lever posterior-tilt plank significantly increases muscle activation compared to the traditional prone plank. The long-lever component tends to contribute more to these differences than the posterior-tilt component.  相似文献   

Analysis of the distance covered by Brazilian professional futsal players during official matches     

Murilo José De Oliveira Bueno  Fabio Giuliano Caetano  Tiago Julio Costa Pereira  Nicolau Melo De Souza  Gustavo Damasceno Moreira  FáBIO Yuzo Nakamura 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):230-240

The purpose of this study was to measure and characterise the distances covered by Brazilian professional futsal players. The trajectories of 93 players during five matches were obtained using an automatic tracking method. The distances covered were analysed for different game conditions: over the entire game and during the times when the ball was out of play and in play separately. When the entire game was considered, the results showed that there was a reduction in the total distance covered per minute from the first [median ± IQR (interquartile range): 97.9 ± 16.2 m/min] to the second half (median = 90.3 m/min; IQR = 12.0), and when only the in-play time was considered (first half: 136.6 ± 17.2 m/min; second half: 129.2 ± 16.7 m/min). The percentage of distance covered in the standing and walking velocity range was higher in the second half than in the first when considering the entire game (30.8% and 28.0%, respectively) and during the in-play time (19.3% and 16.2%, respectively). In conclusion, this study verified that futsal players reduced the physical performance during the second half.  相似文献   

R&D offshoring and the productivity growth of European regions     

Davide Castellani  Fabio Pieri 《Research Policy》2013

The recent increase in R&D offshoring has raised fears that knowledge and competitiveness in advanced countries may be at risk of ‘hollowing out’. At the same time, economic research has stressed that this process is also likely to allow some reverse technology transfer and foster growth at home. This paper addresses this issue by investigating the extent to which R&D offshoring is associated with productivity dynamics of European regions.  相似文献   

Natural-Born Arguers: Teaching How to Make the Best of Our Reasoning Abilities     

Hugo Mercier  Maarten Boudry  Fabio Paglieri  Emmanuel Trouche 《教育心理学家》2017,52(1):1-16

We summarize the argumentative theory of reasoning, which claims that the main function of reasoning is to argue. In this theory, argumentation is seen as being essentially cooperative (people have to listen to others' arguments and be ready to change their mind) but with an adversarial dimension (their goal as argument producers is to convince). Consistent with this theory, the experimental literature shows that solitary reasoning is biased and lazy, whereas reasoning in group discussion produces good results, provided some conditions are met. We formulate recommendations for improving reasoning performance, mainly, to make people argue more and better by creating felicitous conditions for group discussion. We also make some suggestions for improving solitary reasoning, in particular to maximize students' exposure to arguments challenging their positions. Teaching people about the value of argumentation is likely to improve not only immediate reasoning performance but also long-term solitary reasoning skills.  相似文献   

Analysis of the intraseasonal stability of field test performances in young academy soccer players     

Fabio Massimo Francioni  António José Figueiredo  Marco Terribili  Antonio Tessitore 《Journal of sports sciences》2016,34(10):966-972

This study aimed to observe the intraseasonal stability of anthropometric, technical and functional test results in academy soccer players of different age categories. In total, 103 participants (age range: 7.7–13.4 years) by 5 age categories of the same academy were recruited for this study. Players were submitted to a field-test battery comprising 3 anthropometric measurements (body mass, stature and body mass index), 6 soccer technical tests (to assess the ability of ball control, ball control with the head, pass accuracy, shooting accuracy, dribbling and dribbling with pass) and 3 functional tests (countermovement jump with the hands on the hip, countermovement jump with free hands and 15-m linear sprint) that was administered in 4 test sessions during the same season. Though anthropometric results showed a clear increment in each age category across the season, the fluctuation of technical test results depended on age category and test session. Moreover, a significant increase in the results of functional tests was observed in most of the age categories, in particular, for the assessment of lower power limb. In conclusion, collecting repeated intraseason measurements permits the identification of players’ fluctuations of performance across the season and allows coaches to make frequent adjustments of their programmes.  相似文献   

Twitter Use During TV: A Full-Season Analysis of #serviziopubblico Hashtag     

Luca Rossi  Fabio Giglietto 《广播与电子媒介杂志》2016,60(2):331-346

Several recent reports pointed out how the practice of using a “second screen” while following a television program is becoming an increasingly widespread phenomenon. When the secondary device is used to read or to comment about a watched program, most of the discussion takes place on popular social media such as Facebook and Twitter. Previous research has shown that the analysis of these contents could lead to a better understanding of the behavior of networked publics and of the structure of the show itself. Nevertheless most of the existing research is focused on the content only and focused on a single episode analysis or on big media events. Leveraging this background, this article presents instead a study focused on the relationships between content and users across an entire airing season of a TV program. Through a quantitative network analysis of the tweets produced during 25 episodes of the Italian political talks show Servizio Pubblico, we identified a small loyal group of viewers. Despite the differences in quantity of content produced, the loyal viewers do not show any sign of forming a community-like structure. We also performed a qualitative analysis of the tweets produced during one specific episode and discussed the elements of the TV show that generated the higher level of engagement on Twitter.  相似文献   

Effects of beliefs about meaning construction and task instructions on interpretation of narrative text     

Lucia Mason  Fabio Scirica  Laura Salvi 《Contemporary educational psychology》2006,31(4):411-437

Two dimensions of students’ beliefs about meaning construction in reading processes, transmission and transaction beliefs, were studied. According to transmission beliefs, the reader’s task is to understand the author’s intended meaning, while transaction beliefs assign to the reader the role of active meaning constructor. Students’ beliefs were ascertained by means of a questionnaire (Schraw, 2000), and the effects of these beliefs on narrative text comprehension and interpretation were examined. The first study, involving 52 students in grade 11, showed that transaction beliefs positively affected text interpretation in the form of personal and thematic responses. Study 2, involving 202 students in grades 7 and 11, revealed the influence of transaction beliefs on text comprehension, thematic, and personal interpretative responses, and overall meaning construction. It also showed the positive effects of giving specific rather than generic instructions for the interpretative task. Moreover, grade level significantly affected text comprehension and interpretation. Finally, differences in student performances were also related to the type of high school they were enrolled in.  相似文献