The effects of limb dominance and a short term,high intensity exercise protocol on both landings of the vertical drop jump: implications for the vertical drop jump as a screening tool     

Enda F. Whyte  Patrick Kennelly  Oliver Milton  Chris Richter  Siobhán O’Connor  Kieran A. Moran 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(4):541-553

The effectiveness of vertical drop jumps (VDJs) to screen for non-contact ACL injuries is unclear. This may be contributed to by discrete point analysis, which does not evaluate patterns of movement. Also, limited research exists on the second landing of VDJs, potential lower limb performance asymmetries and the effect of fatigue. Statistical parametric mapping investigated the main effects of landing, limb dominance and a high intensity, intermittent exercise protocol (HIIP) on VDJ biomechanics. Twenty-two male athletes (21.9 ± 1.1 years, 180.5 ± 5.5 cm, 79.4 ± 7.8 kg) performed VDJs pre- and post-HIIP. Repeated measures ANOVA identified pattern differences during the eccentric phases of the first and second landings bilaterally. The first landing displayed greater (internal) knee flexor (η² = 0.165), external rotator (η² = 0.113) and valgus (η² = 0.126) moments and greater hip (η² = 0.062) and knee (η² = 0.080) flexion. The dominant limb generated greater knee flexor (η² = 0.062), external rotator (η² = 0.110) and valgus (η² = 0.065) moments. The HIIP only had one effect, increased thoracic flexion relative to the pelvis (η² = 0.088). Finally, the dominant limb demonstrated greater knee extensor moments during the second landing (η² = 0.100). ACL injury risk factors were present in both landings of VDJs with the dominant limb at potentially greater injury risk. Therefore, VDJ screenings should analyse both landings bilaterally.  相似文献   

Understanding teacher professional learning through cyber research     

Meg S. Bates  Lena Phalen  Cheryl Moran 《Educational technology research and development : ETR & D》2018,66(2):385-402

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Which drop jump technique is most effective at enhancing countermovement jump ability, “countermovement” drop jump or “bounce” drop jump?     

Brendan Michael Marshall  Kieran Andrew Moran 《Journal of sports sciences》2013,31(12):1368-1374

Abstract

The drop jump is a popular form of plyometric exercise often undertaken to enhance countermovement jump ability (jump height). Despite its popularity the effects of drop jump training on countermovement jump height are often inconsistent. Such inconsistencies may be as a result of differences in the drop jump technique being employed. Two recognised forms of drop jump are the “countermovement” drop jump and the “bounce” drop jump and the current study examined the effects of eight weeks of training with these drop jump techniques on countermovement jump height. Methods: A kinetic and kinematic analysis of each participant's countermovement jump, bounce- and countermovement drop jumps was undertaken prior to training. Participants were then randomly assigned to a bounce drop jump training group (n = 34), a countermovement drop jump training group (n = 35) or a control group (n = 34). Changes in jump height were examined following training. Results: The countermovement drop jump training group increased their countermovement jump height by 2.9 cm (6%), which was a significant change (P < 0.05) in comparison to that experienced by the bounce drop jump (-0.2 cm, -0.4%) and the control group (-0.1 cm, 0.2%). Conclusion: The countermovement drop jump may be more effective than the bounce drop jump at enhancing countermovement jump height.  相似文献   

Attachment representations of deaf adults     

McKinnon CC  Moran G  Pederson D 《Journal of deaf studies and deaf education》2004,9(4):366-386

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Axioms, Essences, and Mostly Clean Hands: Preparing to Teach Chemistry with Libavius and Aristotle     

Bruce T. Moran 《Science & Education》2006,15(2-4):173-187

Andreas Libavius’ (c. 1555–1616) three part collection of letters, the Rerum chymicarum epistolica forma ... liber (1595–1599) is a particularly important text in fashioning the subject of chemistry as a demonstrative science and as a didactic discipline. Where Libavius’ Alchemia, which some have claimed to be the first textbook of chemistry, had mostly a humanist agenda, the Rerum chymicarum ... liber more directly sought to wrest the subject of “chemistry” away from Paracelsian adepts, and established the methodological basis for a specific form of knowledge suitable to the university. Making use of Aristotle’s Posterior analytics Libavius created a “floor-plan” for chemistry that integrated practical experience with natural philosophy, and could thus, he claimed, penetrate more deeply into the structure of nature than other academic disciplines.  相似文献   

Deaf signers who know Japanese remember words and numbers more effectively than deaf signers who know English     

Flaherty M  Moran A 《American annals of the deaf》2004,149(1):39-45

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Introduction     

Carrie Moran 《Journal of Library & Information Services in Distance Learning》2014,8(1-2)

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8–12 middle schools: views of a local system     

Roger Barrett  Charles Cuff  Peter Moran 《Education 3-13》2013,41(1):10-14

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Low-Income Minority Seniors' Enrollment in a Cybercafé: Psychological Barriers to Crossing the Digital Divide     

Younbo Jung  Wei Peng  Meghan Moran  Seung-A Annie Jin  Margaret McLaughlin  Michael Cody 《Educational gerontology》2013,39(3):193-212

Investigated were why some low income, predominantly immigrant seniors (n = 91) choose to enroll in free training and start to use computers and the Internet while others choose not to enroll. The study was conducted in collaboration with a senior center in downtown Los Angeles that provides free Internet access and training to its seniors. The results suggest that psychological variables (e.g., computer anxiety, computer self-efficacy, and aging anxiety) are stronger predictors of older adults' enrollment than their age or actual experience in using computers. Discussed are ways to motivate seniors to participate in computer training by reducing potential barriers.  相似文献   

A meta-analysis of maturation-related variation in adolescent boy athletes’ adaptations to short-term resistance training     

Jason Moran  Gavin R. H. Sandercock  Rodrigo Ramírez-Campillo  César Meylan  Jay Collison  Dave A. Parry 《Journal of sports sciences》2017,35(11):1041-1051

This meta-analysis investigated the maturation-related pattern of adaptations to resistance training in boy athletes. We included studies examining the effects of 4–16-week resistance training programmes in healthy boy athletes aged 10–18 years. Pooled estimates of effect size for change in strength across all studies (n = 19) were calculated using the inverse–variance random effects model for meta-analyses. Estimates were also calculated for groups based on likely biological maturity status (“before”, “during” and “after” peak height velocity). Using the standardised mean difference, resistance training increased strength across all groups (effect size = 0.98, [CI: 0.70–1.27]). Strength gains were larger during (1.11 [0.67–1.54]) and after (1.01 [0.56–1.46]) peak height velocity than before (0.5 [?0.06–1.07]). Adaptations to resistance training are greater in adolescent boys during or after peak height velocity. These findings should help coaches to optimise the timing of training programmes that are designed to improve strength in boy athletes.  相似文献