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Gustavo Leporace Marcio Tannure Gabriel Zeitoune Leonardo Metsavaht Moacir Marocolo Alex Souto Maior 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):411-420
AbstractThe aim of this study was to test the correlation between knee-to-hip flexion ratio during a single leg landing task and hip and knee strength, and ankle range of motion. Twenty-four male participants from a professional soccer team performed a continuous single leg jump-landing test during 10s, while lower limb kinematics data were collected using a motion analysis system. After biomechanical testing, maximal isometric hip (abduction, extension, external rotation), knee extension and flexion strength were measured. Maximum ankle dorsiflexion range of motion was assessed statically using the weight bearing lunge test. Pearson correlation coefficients were calculated to determine the associations between the predictor variables (knee and hip strength, and ankle ROM) and the main outcome measure (knee-to-hip flexion ratio). Correlation between knee-to-hip flexion ratio and hip abductors strength was significant (r = ?0.47; p = 0.019). No other significant correlations were observed among the variables (p > 0.05). These results demonstrated that a lower hip abductors strength in male soccer players was correlated with a high knee-to-hip flexion ratio during landing from a single leg jump, potentially increasing knee overload by decreasing energy absorption at the hip. The results provide a novel proposal for the functioning of hip muscles to control knee overload. 相似文献
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Renata M. Collares Luiza V. S. Miklasevicius Mariana M. Bassaco Nina P. G. Salau Marcio A. Mazutti Dilson A. Bisognin Lisiane M. Terra 《Journal of Zhejiang University. Science. B》2012,13(7):579-586
This work evaluates the enzymatic hydrolysis of starch from cassava using pectinase, α-amylase, and amyloglucosidase. A central composite rotational design (CCRD) was carried out to evaluate the effects of amyloglucosidase, pectinase, reaction time, and solid to liquid ratio. All the experiments were carried out in a bioreactor with working volume of 2 L. Approximately 98% efficiency hydrolysis was obtained, resulting in a concentration of total reducing sugar released of 160 g/L. It was concluded that pectinase improved the hydrolysis of starch from cassava. Reaction time was found to be significant until 7 h of reaction. A solid to liquid ratio of 1.0 was considered suitable for hydrolysis of starch from cassava. Amyloglucosidase was a significant variable in the process: after its addition to the reaction media, a 30%–50% increase in the amount of total reducing sugar released was observed. At optimal conditions the maximum productivity obtained was 22.9 g/(L·h). 相似文献
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Robbie S Wilson Nicholas M A Smith Solange de Paula Ramos Fabio Giuliano Caetano Marcio Aparecido Rinaldo Paulo Roberto Pereira Santiago 《Journal of sports sciences》2019,37(9):1072-1079
This study assessed whether a new, closed-skill dribbling or sprinting task could predict attacking performance in soccer. Twenty-five male players were recruited from the Londrina Junior Team Football Academy in Brazil and asked to either dribble the ball or sprint through five custom circuits that varied in average curvature (0–1.37 radians.m?1). These measures were then validated using a realistic one vs. one competition in which each player acted as attacker or defender in turn (N = 1330 bouts). Sprinting (ICC = 0.96) and dribbling (ICC = 0.97) performances were highly repeatable for individual players. Average dribbling speed decreased non-linearly with increasing circuit curvature (F = 239.5; P < 0.001) from 5.19 ± 0.11 ms?1 on the straightest path to 2.13 ± 0.03 ms?1 on the curviest. Overall, dribbling but not sprinting performance predicted attacking success in the one vs. one competition, explaining more than 50% of the variation in attacking success alone (rp = 0.70; P < 0.001). In conclusion, our new closed-skill dribbling assessment is a valid and reliable protocol to predict a soccer player’s success in attacking performance in one vs. one situation, and can be used to identify talented players. 相似文献
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The theatrical play O Bem Amado is based on a tragic and comical Brazilian reality: the way politicians plot their interests, without regard for their voters’ well-being. Populist and eccentric, the protagonist Odorico Paraguaçu embodies gestures, spoken gags, unfilled promises, and other typical characteristics of Brazilian politicians. This article analyzes how the most recent cinematic version of the play staged a character who was born in the 1960s, became a television soap opera hit in the 1970s, starred a movie in the 2000s, and comes back to life in every election period. We intend to make clear that much of what was criticized in Brazilian politics then is still very much alive today. The characteristics that make Odorico laughable are described in the article and are the same ones that highlight aspects of Brazilian political culture, all played out in a lighthearted comedy of manners spiced with political satire. This article introduces the latest version of O Bem Amado with some important background information. Based on scenes extracted from the film, popular comedy is portrayed as an opportunity for the public to take revenge, through mockery, of those who take advantage of their public position in favor of private interest. The article also explores added dimensions of the most recent version, brought on by new technological aspects added when the story was adapted for the big screen. 相似文献
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