The ingestion of a caffeinated energy drink improves jump performance and activity patterns in elite badminton players     

Pablo Abian  Juan Del Coso  Juan José Salinero  Cesar Gallo-Salazar  Francisco Areces  Diana Ruiz-Vicente 《Journal of sports sciences》2015,33(10):1042-1050

The aim of this study was to investigate the effectiveness of a caffeine-containing energy drink to enhance physical and match performance in elite badminton players. Sixteen male and elite badminton players (25.4 ± 7.3 year; 71.8 ± 7.9 kg) participated in a double-blind, placebo-controlled and randomised experiment. On two different sessions, badminton players ingested 3 mg of caffeine per kg of body mass in the form of an energy drink or the same drink without caffeine (placebo). After 60 min, participants performed the following tests: handgrip maximal force production, smash jump without and with shuttlecock, squat jump, countermovement jump and the agility T-test. Later, a 45-min simulated badminton match was played. Players’ number of impacts and heart rate was measured during the match. The ingestion of the caffeinated energy drink increased squat jump height (34.5 ± 4.7 vs. 36.4 ± 4.3 cm; P < 0.05), squat jump peak power (P < 0.05), countermovement jump height (37.7 ± 4.5 vs. 39.5 ± 5.1 cm; P < 0.05) and countermovement jump peak power (P < 0.05). In addition, an increased number of total impacts was found during the badminton match (7395 ± 1594 vs. 7707 ± 2033 impacts; P < 0.05). In conclusion, the results show that the use of caffeine-containing energy drink may be an effective nutritional aid to increase jump performance and activity patterns during game in elite badminton players.  相似文献   

Addressing the big picture: Deaf children and reading assessments     

Ashley Greene-Woods  Natalie Delgado 《Psychology in the schools》2020,57(3):394-401

In the field of education, there is a great emphasis placed on literacy, from reading fluency to writing. There are various approaches that teachers can use in their classroom to design and identify needed areas of instruction, but these approaches do not always apply to Deaf Education. The act of using the same assessments throughout all student populations presents some potential issues, particularly the question of whether or not the students’ actual literacy abilities are being identified. The focus is to spotlight a frequently used approach for measuring reading fluency and present an alternative approach.  相似文献   

Cross‐time attitudes,concept formation,and achievement in college freshman physics     

Victor L. Willson  Cheryl Ackerman  Cesar Malave 《科学教学研究杂志》2000,37(10):1112-1120

The relationships among science and engineering attitude, physics conceptual understanding, and physics achievement were explored for a population of college freshman engineering students over two semesters. Gender and SAT‐Quantitative measures were included as exogenous variables in a longitudinal path analysis. Attitude was theorized to predict achievement contemporaneously and at the next time point, while conceptual understanding was theorized to predict physics achievement contemporaneously and at the next time point. Each at one time was theorized to predict scores at the next time. A sample of 200 freshman engineering students participating in an integrated curriculum were assessed in September, December, and April (with a loss of 64 students) with the Force Concepts Inventory (FCI), Mechanics Baseline Test (MBT), and a locally developed attitude measure. The observed model indicated that the FCI predicted attitude at time 1 with no other paths between them, that FCI at time 1 predicted MBT at time 1 and time 2, FCI at time 2 predicted MBT at time 3, and MBT at time 1 predicted FCI at time 2. Gender and SAT‐Quantitative scores were predictive only of FCI and MBT at time 1. Results supported an interactive model of conceptual understanding and achievement, with attitude largely irrelevant to the process for this population. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 1112–1120, 2000  相似文献