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Mostafa Zarei Hamed Abbasi Abdolhamid Daneshjoo Tohid Seif Barghi Nikki Rommers Oliver Faude 《Journal of sports sciences》2018,36(21):2447-2454
This study examined the long-term effects of the 11+ on physical performance in adolescent male football (soccer) players. Eighty-two 14- to 16-year-old male football players (11+ = 42 players, control = 40 players) participated. Teams were randomised to control (CON) and intervention (INT) groups. INT applied the 11+ injury prevention programme for 30 weeks at least twice a week as a warm-up. CON performed their standard warm-up. Motor performance tests were conducted 1 week prior and 1 week after the competition season. We used magnitude-based inferences and linear mixed-effects models to analyse performance test results. INT showed superior results compared to CON in the vertical jump height 7.5% (95%-CI 4.4%, 10.7%), the Bosco 15-s-jump test 7.2% (95%-CI 2.2%, 12.4%), and the Illinois agility test ?2.6% (95%-CI ?4.1%, ?1.1%). Possibly beneficial effects in favour of INT were found in the 9.1 m sprint test ?3.1% (95%-CI ?6.1%, 0.1%). Possibly harmful effects (i.e. in favour of CON) were observed in the dribbling test 2.8% (95%-CI ?0.8%, 6.4%). The 11+ warm-up programme can improve different performance measures in football players. Coaches might implement additional dribbling drills next to the 11+ to achieve improvements observed in dribbling ability when using a regular warm-up programme. 相似文献
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Thouraya Mhenni Lars Bojsen Michalsik Mohamed Arbi Mejri Narimen Yousfi Anis Chaouachi Nizar Souissi 《Journal of sports sciences》2017,35(9):912-920
This study investigated the two different time-of-day effect on team-handball-related short-term maximal physical performances. At two different time-of-day, fifteen young female team handball players performed different physical tests: HandGrip (HG) test, Ball-Throwing Velocity (BTV) test, Modified Agility T-test (MAT) and Repeated Shuttle-Sprint and Jump Ability (RSSJA) test. Rating of perceived exertion (RPE) scale was determined following the termination of the last test. Measurements were performed at two separate testing sessions (i.e., in the morning (7:00–8:30 h) and in the early evening (17:00–18:30 h)) in a randomised and counter-balanced setting on non-consecutive days. The results showed that HG (P = 0.0013), BTV (P = 0.0027) and MAT (P < 0.001) performances were better in the evening compared with the morning. During RSSJA, both best and mean sprint times were shorter in the evening compared to the morning (P < 0.001). Moreover, during the latter test, mean jump performance was higher in the evening compared to the morning (P = 0.026). However, there was no morning–evening difference in the best jump performance during RSSJA. Likewise, jump performance decrement was not affected by the time-of-day of testing. On the other hand, RPE fluctuated, with morning nadirs and afternoon/early evening highest values. The findings suggest that in female team handball players, team-handball-related short-term maximal physical performances were better in the afternoon than in the morning. 相似文献
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数学教学的重要目的在于培养学生的数学思维能力,而思维能力反映在思维品质上,它是数学思维结构中的重要部分。本文提出在数学教学中,如何强化思维训练与发展思维能力及引导学生思维的深刻性、灵活性、敏捷性、批判性、独创性及广阔性,培养学生良好的思维品质。 相似文献
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Susana María Gil Jon Zabala-Lili Iraia Bidaurrazaga-Letona Badiola Aduna Jose Antonio Lekue Jordan Santos-Concejero 《Journal of sports sciences》2014,32(20):1931-1939
AbstractThe aim of this study was to analyse the talent identification process of a professional soccer club. A preselection of players (n = 64) aged 9–10 years and a final selection (n = 21) were performed by the technical staff through the observation during training sessions and matches. Also, 34 age-matched players of an open soccer camp (CampP) acted as controls. All participants underwent anthropometric, maturity and performance measurements.Preselected outfield players (OFs) were older and leaner than CampP (P < 0.05). Besides, they performed better in velocity, agility, endurance and jump tests (P < 0.05). A discriminant analysis showed that velocity and agility were the most important parameters. Finally, selected OFs were older and displayed better agility and endurance compared to the nonselected OFs (P < 0.05). Goalkeepers (GKs) were taller and heavier and had more body fat than OFs; also, they performed worse in the physical tests (P < 0.05). Finally, selected GKs were older and taller, had a higher predicted height and advanced maturity and performed better in the handgrip (dynamometry) and jump tests (P < 0.05).Thus, the technical staff selected OFs with a particular anthropometry and best performance, particularly agility and endurance, while GKs had a different profile. Moreover, chronological age had an important role in the whole selection process. 相似文献
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虞黎明 《宁波教育学院学报》2013,15(1):130-132,138
在"空间与图形"教学中,对例习题中的标准图形进行适当变式,采用一图多解,多图一解,一图多变或一图多用等方法,培养学生的空间观念,优化学生的思维品质,从而促进学生思维能力的发展。 相似文献
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Pei-Ying Huang Tao Hua Ouyang Shan L. Pan Tzu-Chuan Chou 《International Journal of Information Management》2012
Operational agility has increasingly become essential for survival and prosperity for contemporary organizations. Given its significant role in a turbulent business environment, this concept has garnered considerable research attention over the past ten years. However, due to the complex nature of operational agility, how to achieve this important organizaitonal capability is still not clearly understood. Thus the present study attempts to open this black box through examing a case study of Haier, the largest household appliances producer in China. The findings of this case highlight the significant role played by IT leveraging competence in achieving operational agility. It shows that IT leveraging competence helps enhance firm's ability to process information in a turbulent business environment, which results in information processing efficiency and information processing effectiveness. With the enhancement in the ability to process information, the focal firm is capable to sense and respond to market changes more readily. 相似文献
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Carlos Balsalobre-Fernández Chris Bishop José Vicente Beltrán-Garrido Pau Cecilia-Gallego Aleix Cuenca-Amigó Daniel Romero-Rodríguez 《Journal of sports sciences》2013,31(21):2420-2424
ABSTRACTThe aim of the present investigation was to analyze the validity and reliability of a novel iPhone app (CODTimer) for the measurement of total time and interlimb asymmetry in the 5 + 5 change of direction test (COD). To do so, twenty physically active adolescent athletes (age = 13.85 ± 1.34 years) performed six repetitions in the COD test while being measured with a pair of timing gates and CODTimer. A total of 120 COD times measured both with the timing gates and the app were then compared for validity and reliability purposes. There was an almost perfect correlation between the timing gates and the CODTimer app for the measurement of total time (r = 0.964; 95% Confidence interval (CI) = 0.95–1.00; Standard error of the estimate = 0.03 s.; p < 0.001). Moreover, non-significant, trivial differences were observed between devices for the measurement of total time and interlimb asymmetry (Effect size < 0.2, p > 0.05). Similar levels of reliability were observed between the timing gates and the app for the measurement of the 6 different trials of each participant (Timing gates: Intraclass correlation coefficient (ICC) = 0.651–0.747, Coefficient of variation (CV) = 2.6–3.5%; CODTimer: ICC = 0.671–0.840, CV = 2.2–3.2%). The results of the present study show that change of direction performance can be measured in a valid, reliable way using a novel iPhone app. 相似文献
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本文基于敏捷性视角，通过双案例对比研究方法，探讨资源约束情境下，中国跨国企业（CMNEs）如何通过组织敏捷性和资源组合实现朴素式创新。研究发现：资源约束情境下的CMNEs尤其适用朴素式创新，能够带来关注低成本、核心功能和“足够好”性能水平的产品或服务；组织敏捷性是实现朴素式创新的有效途径，自主品牌型企业通过从设计到制造的组织敏捷性实现朴素式创新，而贴牌型企业通过从制造到设计的组织敏捷性实现朴素式创新；CMNEs能够根据组织敏捷性，灵活调整资源组合支持并提升组织敏捷性。研究结论拓展了朴素式创新的相关研究，为CMNEs的成长提供理论借鉴与实践启示。 相似文献