Repeated sprint ability in young basketball players: one vs. two changes of direction (Part 1)     

Johnny Padulo  Guillaume Laffaye  Monoem Haddad  Anis Chaouachi  Giuseppe Attene  Gian Mario Migliaccio 《Journal of sports sciences》2015,33(14):1480-1492

The present study aimed to compare the changes of direction on repeated sprint ability (RSA) vs. intensive repeated sprint ability (IRSA) protocols in basketball. Eighteen young male basketball players performed on RSA [10 × 30-m (15 + 15-m, one change of direction)] and IRSA [10 × 30-m (10 + 10 + 10-m, two changes of direction)]. A correlation matrix between RSA, IRSA, “squat jump (SJ)–countermovement jump (CMJ)”, footstep analysis and total distance in Yo-Yo intermittent recovery level 1 was performed. The best time, worst time, total time and the number of footsteps were significantly smaller in the RSA test compared to IRSA test (P < 0.001), even though they were significantly correlated with each other (r > 0.80, P < 0.05). Blood lactate level and fatigue index did not show any difference between tests. The sensibility of the two tests assessed by the Bland–Altman analysis revealed a small bias (<1.5%) for almost all variables. Moreover, almost all time variables of the two tests were significantly correlated with the SJ (r > 0.478, P < 0.05), CMJ (r > 0.515, P < 0.05) and Yo-Yo (r > 0.489, P < 0.05) performances. The IRSA provided a reliable method for assessing specific sprint ability (with 10-m legs for IRSA ~2.3 s vs. 15 m for RSA ~3 s) with a closer link to basketball game’s actions (~2 s). Besides, IRSA could be an appropriate choice for assessing both RSA and changes of direction capacities in basketball players.  相似文献   

Not Good Enough?     

Maria Nilsson 《Journalism Practice》2015,9(4):484-501

An increasing flow of amateur images of global crises presents challenges and opportunities for mainstream news media. Furthermore, many news organizations now solicit eyewitness reports for near-instant upload to Web editions. Yet, there is a lack of empirical research on amateur images in the regular news flow, in particular in newspapers. Thus, this case study examines the general frequency of amateur content, the gatekeeping process and the opinions of editors making decisions about images for publication in the online and print editions of four Swedish newspapers. Our findings, based on quantitative content analyses and interviews, indicate that a majority of the content falls in the hard-news category in contrast to findings in previous research about user-generated text content. Moreover, it appears regularly but in small numbers in a tabloid-content daily and a regional paper but hardly ever in broadsheet-content papers, and that opinions in the newsroom about amateur images vary from a lack of interest to a stated need for them in the regular news coverage. The low impact of amateur content may be due to the gatekeeping process and professional standards of photography, as well as a lack of audience interest and difficulties in implementing new structures in the newsrooms. In sum, the findings disprove predictions in the literature of a near-paradigmatic rise of amateur content in the mainstream news media.  相似文献