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Saulo Gil Irineu Loturco Valmor Tricoli Carlos Ugrinowitsch Ronaldo Kobal Cesar Cavinato Cal Abad 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):340-350
Tensiomyography has been suggested as an indirect marker of muscle stiffness, which is associated with strength/power performance. Therefore, it is reasonable to suggest that tensiomyography parameters could be associated with power-related motor tasks. The purpose of this study was to investigate the association between tensiomyography parameters (from rectus and biceps femoris) and jumping and sprinting abilities in elite soccer players. In addition, we used tensiomyography parameters to compare the lateral symmetry between dominant and non-dominant legs. Twenty elite soccer players (age: 23.3 ± 4.8 years; height: 183.5 ± 6.6 cm; weight: 77.8 ± 7.5 kg) volunteered to participate in the study. Significant moderate negative correlations between biceps femoris displacement and contact time (r = –0.5, p = 0.03), rectus femoris displacement and contact time (r = –0.51, p = 0.02), and a significant moderate correlation between biceps femoris displacement and reactive strength index (r = 0.5, p = 0.03) were found. There were no correlations between tensiomyography parameters and power-related motor tasks. In addition, no differences in tensiomyography parameters between dominant and non-dominant legs were found. Our data suggest that tensiomyography parameters are not associated with power-related motor tasks performance in elite soccer players. 相似文献
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Natalia Ribeiro Carlos Ugrinowitsch Valéria Leme Gonçalves Panissa Valmor Tricoli 《European Journal of Sport Science》2019,19(3):287-294
The aim of the present study was to investigate the acute effect of the aerobic exercise volume on maximum strength and strength-endurance performance; and possible causes of strength decrements (i.e. central and peripheral fatigue). Twenty-one moderately trained men were submitted to a maximal incremental test to determine anaerobic threshold (AnT) and maximum dynamic strength (1RM) and strength-endurance (i.e. total volume load [TV]) tests to determine their baseline strength performance. Following, subjects performed six experimental sessions: aerobic exercise sessions (continuous running at 90% AnT) with different volumes (3?km, 5?km or 7?km) followed by 1RM or strength-endurance test in the 45° leg press exercise. Maximum voluntary isometric contraction (MVIC), voluntary activation (VA) level, contractile properties, and electromyographic activity (root mean square [RMS]) of the knee extensor muscles were assessed before and after aerobic exercises and after strength tests. TV was lower after 5?km and 7?km runs than in the control condition (12% and 22%, respectively). Additionally, TV was lower after 7?km than 3?km (14%) and 5?km (12%) runs. MVIC, VA, RMS, and contractile properties were reduced after all aerobic exercise volumes (～8%, ～5%, ～11% and ～6–14%, respectively). Additionally, MVIC, VA, and contractile properties were lower after strength tests (～15%, ～6%, ～9–26%, respectively). In conclusion, strength-endurance performance is impaired when performed after aerobic exercise and the magnitude of this interference is dependent on the aerobic exercise volume; and peripheral and central fatigue indices could not explain the different TV observed. 相似文献
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Brazilian higher education institutions face a complex and challenging environment as the national market in education is becoming more competitive. International investment, a decrease in the population of potential students, and the proliferation of innumerable small institutions add to this complexity. Organizations are becoming flatter and the key managers within them are deans. Although deans are required to act as managerial experts, they are usually selected from the teaching body of the institution. In this paper, a group of deans from a large private institution gave their self‐assessment of their academic and managerial skills. The results revealed that they tend to have a high perception of their managerial skills, even though they have no previous managerial experience or formal training. This underlines that senior academic administrators cannot simply assume that deans, by the nature of their work environment, are proficient in managerial skills; neither that they can easily identify inadequacies nor have them self‐corrected. To accomplish the necessary institutional changes to face the complexities of the current globalized education market, a new assessment culture has to be implemented in the academic environment. 相似文献
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Saulo Gil Renato Barroso Everton Crivoi do Carmo Irineu Loturco Ronaldo Kobal Valmor Tricoli 《Journal of sports sciences》2018,36(17):1923-1929
Resisted sprint training consists of performing overloaded sprints, which may produce greater effects than traditional sprint training. We compared a resisted sprint training with overload control versus an unresisted sprint training program on performance in soccer players. Eighteen elite athletes were randomly assigned to resisted (RST) or unresisted sprint training protocol (UR). Before and after a 6-week training period, sprinting ability, change of direction speed (COD), vertical jumps (SJ and CMJ), mean power (MP) and mean propulsive power (MPP) at distinct loads were assessed. Both groups improved sprinting ability at all distances evaluated (5m: UR = 8%, RST = 7%; 10m: UR = 5%, RST = 5%; 15m: UR = 4%, RST = 4%; 20m: UR = 3%, RST = 3%; 25m: UR = 2%, RST = 3%;), COD (UR = 6%; RST = 6%), SJ (UR = 15%; RST = 13%) and CMJ (UR = 15%; RST = 15%). Additionally, both groups increased MP and MPP at all loads evaluated. The between-group magnitude-based inference analysis demonstrated comparable improvement (“trivial” effect) in all variables tested. Finally, our findings support the effectiveness of a short-term training program involving squat jump exercise plus sprinting exercises to improve the performance of soccer players. 相似文献
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Brazilian higher education institutions face a complex and challenging environment as the national market in education is becoming more competitive. International investment, a decrease in the population of potential students, and the proliferation of innumerable small institutions add to this complexity. Organizations are becoming flatter and the key managers within them are deans. Although deans are required to act as managerial experts, they are usually selected from the teaching body of the institution. In this paper, a group of deans from a large private institution gave their self-assessment of their academic and managerial skills. The results revealed that they tend to have a high perception of their managerial skills, even though they have no previous managerial experience or formal training. This underlines that senior academic administrators cannot simply assume that deans, by the nature of their work environment, are proficient in managerial skills; neither that they can easily identify inadequacies nor have them self-corrected. To accomplish the necessary institutional changes to face the complexities of the current globalized education market, a new assessment culture has to be implemented in the academic environment.
相似文献
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