One variation of vertical jump (VJ) training is resisted or weighted jump training, where wearable resistance (WR) enables jumping to be overloaded in a movement specific manner. A two-way analysis of variance with Bonferroni post hoc contrasts was used to determine the acute changes in VJ performance with differing load magnitudes and load placements. Kinematic and kinetic data were quantified using a force plate and contact mat. Twenty sport active subjects (age: 27.8?±?3.8 years; body mass (BM): 70.2?±?12.2?kg; height: 1.74?±?0.78?m) volunteered to participate in the study. Subjects performed the counter movement jump (CMJ), drop jump (DJ) and pogo jump (PJ) wearing no resistance, 3% or 6% BM affixed to the upper or lower body. The main finding in terms of the landing phase was that the effect of WR was non-significant (P?>?.05) on peak ground reaction force. With regard to the propulsive phase the main findings were that for both the CMJ and DJ, WR resulted in a significant (P?<?.05) decrease in jump height (CMJ: ?12% to ?17%, DJ: ?10% to ?14%); relative peak power (CMJ: ?8% to ?17%, DJ: ?7% to ?10%); and peak velocity (CMJ: ?4% to ?7%, DJ: ?3% to ?8%); while PJ reactive strength index was significantly reduced (?15% to ?21%) with all WR conditions. Consideration should be given to the inclusion of WR in sports where VJ’s are important components as it may provide a novel movement specific training stimulus.Highlights
WR of 3 or 6 % BM provided a means to overload the subjects in this study resulting in decreased propulsive power and velocity that lead to a reduced jump height and landing force.
Specific strength exercises that closely mimic sporting performance are more likely to optimise transference, therefore WR with light loads of 3–6% body mass (BM)appear a suitable tool for movement specific overload training and maximising transference to sporting performance.
Practitioners can safely load their athletes with upper or lower body WR of 3–6% BM without fear of overloading the athletesover and above the landing forces they are typically accustomed too.
As a training stimulus it would seem the WR loading provides adequate overload and athletes should focus on velocity of movement to improve power output and jump height i.e. take-off velocity.
AbstractThis article reports on the “2019 Best Practices from World Libraries” Photo Gallery Project initiated by the International Connections Committee (ICC) of the International Relations Round Table (IRRT) at the American Library Association (ALA). The project was inspired by a 2018 ALA-IRRT Emerging Leader’s project, Toward Increasing Engagement of International New Professional Leaders in ALA Activities, which followed a survey study developed to explore IRRT’s ability to engage its international members. The article shares the project planning process and the key actions taken to build a virtual and physical gallery for the 2019 ALA Annual Conference in Washington, DC, as well as highlights example programs from the project which demonstrate how libraries around the world are building stronger communities. Finally, the authors consider how the project may be improved upon and further developed in the future. 相似文献
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The United States National Library of Medicine (NLM) has the largest collection of biomedical information products and services in the world. Little is known of the extent to which librarians in sub-Saharan Africa are aware of and use these resources. The study's aim was to assess knowledge and frequency of use of NLM's biomedical information products and services among African librarians. Forty-three of the 50 delegates at the 11th biannual Congress of the Association of Health Information and Libraries in Africa (AHILA) participated in the study. The findings showed that participants' knowledge of NLM information products and services was low and that there is a need for increased awareness and training in the use of NLM's information products and services in order for users on the African continent to effectively benefit from them. 相似文献
Using a daily diary method, this study assessed daily episodes of family and peer conflict among 578 adolescents in the 9th grade to examine potential bidirectional associations between the family and peer domains. Adolescents completed a daily diary checklist at the end of each day over a 14-day period to report events of conflict and their emotional states for a given day. Overall, the within-person models provided evidence for the bidirectional nature of family peer linkages across gender and ethnicity. Adolescents experienced more peer conflict on days in which they argued with parents or other family members, and vice versa. Effect of family conflict further spilled over into peer relationships the next day and 2 days later, whereas peer conflict predicted only the following day family conflict. Adolescents' emotional distress partially explained these short-term spillovers between family and peer conflict. 相似文献
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Palm Beach Community College realigned its curriculum to allow student to seamlessly process through career pathways. Students can start in clock-hour-based instruction and transfer that learning into credit-based associate in science degrees. Along this pathway, students can use exit points to employment with recognized certificates. 相似文献
This study examines math and English standardized test score progress of students who participated in the 21st century program across 2 years of involvement with a focus on the learning trajectories of limited English proficiency (LEP) students. We find that math and English scores are highly associated with the school and program type—even within a single school district. LEP participants are the furthest behind but have the highest gains compared to other participants. Results vary based on the type of outcome (math or reading), the type of activity (academic or enrichment), and the grade level (elementary or middle school). 相似文献