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https://www.readbyqxmd.com/read/29708746/three-fold-intramolecular-ring-closing-alkene-metatheses-of-square-planar-complexes-with-cis-phosphorus-donor-ligands-p-x-ch-2-m-ch-ch-2-3-x-m-5-10-o-3-5-syntheses-structures-and-thermal-properties-of-macrocyclic-dibridgehead-diphosphorus-complexes
#1
Hemant Joshi, Sugam Kharel, Andreas Ehnbom, Katrin Skopek, Gisela D Hess, Tobias Fiedler, Frank Hampel, Nattamai Bhuvanesh, John A Gladysz
Reactions of cis-PtCl2 (P((CH2 ) m CH=CH2 )3 )2 and Grubbs' first generation catalyst and then hydrogenations afford cis-PtCl2 (P((CH2 ) n )3 P) ( cis-2; n = 2 m+2 = b/12, c/14, d/16, e/18, f/20, g/22; 6-40%), derived from three fold interligand metatheses. The phosphite complexes cis-PtCl2 (P(O(CH2 ) m* CH=CH2 )3 )2 are similarly converted to cis-PtCl2 (P(O(CH2 ) n* O)3 P) ( cis-5; n* = a/8, b/10, c/12, 10-20%). The substitution products cis-PtPh2 (P((CH2 ) n )3 P) ( cis-6c,d) and cis-PtI2 (P(O(CH2 )10 O)3 P) are prepared using Ph2 Zn and NaI, respectively...
April 30, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29660632/female-pfp-patients-present-alterations-in-eccentric-muscle-activity-but-not-the-temporal-order-of-activation-of-the-vastus-lateralis-muscle-during-the-single-leg-triple-hop-test
#2
Marcelo Martins Kalytczak, Paulo Roberto Garcia Lucareli, Amir Curcio Dos Reis, André Serra Bley, Daniela Aparecida Biasotto-Gonzalez, João Carlos Ferrari Correa, Fabiano Politti
This study aimed to compare the concentric and eccentric activity and the temporal order of peak activity of the hip and knee muscles between women with patellofemoral pain (PFP) and healthy women during the single leg triple hop test (SLTHT). Electromyographic (EMG) and Kinematic data were collected from 14 healthy women (CG) and 14 women diagnosed with PFP (PFG) during a single session of the single leg triple hop test. Integral surface electromyography (iEMG) data of the hip and knee muscles in eccentric and concentric phases and the length of time that each muscle needed to reach the maximal peak of muscle activity were calculated...
April 7, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29620577/methods-of-identifying-limb-dominance-in-adolescent-female-basketball-players-implications-for-clinical-and-biomechanical-research
#3
Colleen R Mulrey, Sandra J Shultz, Kevin R Ford, Anh-Dung Nguyen, Jeffrey B Taylor
OBJECTIVE: To identify relationships between self-reported limb preferences and performance measures for determining limb dominance in adolescent female basketball players. DESIGN: Cross-sectional cohort study. PARTICIPANTS: Forty adolescent female basketball players. INDEPENDENT VARIABLES AND MAIN OUTCOME MEASURES: Participants provided self-reported preferred kicking and jumping limbs, then completed 3 trials of a single-limb countermovement hop (HOPVER) and unilateral triple hop for distance (HOPHOR) on each limb...
March 29, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29574548/low-rates-of-patients-meeting-return-to-sport-criteria-9-months-after-anterior-cruciate-ligament-reconstruction-a-prospective-longitudinal-study
#4
Wouter Welling, Anne Benjaminse, Romain Seil, Koen Lemmink, Stefano Zaffagnini, Alli Gokeler
PURPOSE: The purpose of the current prospective study was to assess the changes over time in patients tested at 6 months and 9 months after anterior cruciate ligament reconstruction (ACLR) with a return to sport (RTS) test battery. It was hypothesized that more patients passed RTS criteria at 9 months compared to 6 months. METHODS: Sixty-two ACLR patients performed a test battery at an average of 6.5 ± 0.7 and 9.5 ± 0.9 months after ACLR. All patients underwent a standardized rehabilitation protocol...
March 24, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29489719/vertical-and-horizontal-asymmetries-are-related-to-slower-sprinting-and-jump-performance-in-elite-youth-female-soccer-players
#5
Chris Bishop, Paul Read, Jermaine McCubbine, Anthony Turner
Inter-limb asymmetries have been shown to be greater during vertical jumping compared to horizontal jumping. Notable inter-limb differences have also been established at an early age in male youth soccer players. Furthermore, given the multi-planar nature of soccer, establishing between-limb differences from multiple jump tests is warranted. At present, a paucity of data exists regarding asymmetries in youth female soccer players and their effects on physical performance. The aims of this study were to quantify inter-limb asymmetries from unilateral jump tests and examine their effects on speed and jump performance...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29243932/role-of-aromatic-cross-links-in-structure-and-dynamics-of-model-three-stranded-%C3%AE-sheet-peptides
#6
David Scheerer, Heng Chi, Dan McElheny, Ayesha Samer, Timothy A Keiderling, Karin Hauser
A series of closely related peptide sequences that form triple-strand structures was designed with a variation of cross-strand aromatic interactions and spectroscopically studied as models for β-sheet formation and stabilities. Structures of the three-strand models were determined with NMR methods and temperature-dependent equilibrium studies performed using circular dichroism and Fourier transform infrared spectroscopies. Our equilibrium data show that the presence of a direct cross-strand aromatic contact in an otherwise folded peptide does not automatically result in an increased thermal stability and can even distort the structure...
January 18, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29182436/vertical-and-horizontal-jump-capacity-in-international-cerebral-palsy-football-players
#7
Raul Reina, Aitor Iturricastillo, Rafael Sabido, Maria Campayo-Piernas, Javier Yanci
PURPOSE: the aims of the present study were to evaluate the reliability and validity of vertical and horizontal jump tests in football players with cerebral palsy (FPCP), and to analyze the jump performance differences between current IFCPF functional classes (i.e. FT5-FT8). METHODS: One hundred and thirty-two international para-footballers (25.8 ± 6.7 years; 70.0 ± 9.1 kg; 175.7 ± 7.3 cm; 22.8 ± 2.8 kg·m-2 ; 10.7 ± 7.5 years training experience) participated in the study...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29176387/effects-of-plyometric-and-directional-training-on-speed-and-jump-performance-in-elite-youth-soccer-players
#8
Marco Beato, Mattia Bianchi, Giuseppe Coratella, Michele Merlini, Barry Drust
Beato, M, Bianchi, M, Coratella, G, Merlini, M, and Drust, B. Effects of plyometric and directional training on speed and jump performance in elite youth soccer players. J Strength Cond Res 32(2): 289-296, 2018-Soccer players perform approximately 1,350 activities (every 4-6 seconds), such as accelerations/decelerations and changes of direction (CODs) during matches. It is well established that COD and plyometric training have a positive impact on fitness parameters in football players. This study analyzed the effect of a complex COD and plyometric protocol (CODJ-G) compared with an isolated COD protocol (COD-G) training on elite football players...
February 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29116831/clinician-friendly-physical-performance-tests-for-the-knee
#9
Jerrod J Harrison, Marissa K Yorgey, Alexander J Csiernik, Joseph H Vogler, Kenneth E Games
Reference:  Hegedus EJ, McDonough S, Bleakley C, Cook CE, Baxter GD. Clinician-friendly lower extremity physical performance measures in athletes: a systematic review of measurement properties and correlation with injury. Part 1: the tests for knee function including the hop tests. Br J Sports Med. 2015;49(10):642-648. CLINICAL QUESTION:   Do individual physical performance tests (PPTs) used as measures for lower extremity function have any relationship to injuries in athletes aged 12 years or older? DATA SOURCES:   Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were used to locate articles...
November 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/29072033/technical-strategy-of-triple-jump-differences-of-inverted-pendulum-model-between-hop-dominated-and-balance-techniques
#10
Nobuaki Fujibayashi, Mitsuo Otsuka, Shinsuke Yoshioka, Tadao Isaka
BACKGROUND: The present study aims to cross-sectionally clarify the characteristics of the motions of an inverted pendulum model, a stance leg, a swing leg and arms in different triple-jumping techniques to understand whether or not hop displacement is relatively longer rather than step and jump displacements. METHODS: Eighteen male athletes performed the triple jump with a full run-up. Based on the technique of the jumpers, they were classified as hop-dominated (n = 10) or balance (n = 8) jumpers...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29035596/the-elevated-track-in-pole-vault-an-advantage-during-run-up
#11
Johan Cassirame, Hervé Sanchez, Jean Benoit Morin
Approach speed is a major determinant of pole-vault performance. Athletic jump events such as long jump, triple jump and pole vault can utilise an elevated track for the runway. Feedback from athletes indicates a benefit of using an elevated track on their results. However, there is no evidence that elevated tracks do increase athletes' performance. PURPOSE: The aim of this study is to investigate the potential advantage of using an elevated track during elite pole-vault competitions on run-up speed parameters...
October 16, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28986596/palisade-endings-of-extraocular-muscles-develop-postnatally-following-different-time-courses
#12
COMPARATIVE STUDY
Roland Blumer, Johannes Streicher, María A Davis-López de Carrizosa, Rosa R de la Cruz, Angel M Pastor
Purpose: To analyze in a frontal-eyed mammal (cat) the postnatal development of palisade endings in extraocular muscles (EOMs) and to compare the spatiotemporal and quantitative patterns of palisade endings among individual rectus muscles. Methods: Cats of different ages ranging from birth to adult stage were studied. EOM whole-mount preparations were fluorescently labeled using six combinations of triple staining and analyzed in the confocal laser scanning microscope...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28734700/predicting-muscle-forces-during-the-propulsion-phase-of-single-leg-triple-hop-test
#13
Felipe Costa Alvim, Paulo Roberto Garcia Lucareli, Luciano Luporini Menegaldo
Functional biomechanical tests allow the assessment of musculoskeletal system impairments in a simple way. Muscle force synergies associated with movement can provide additional information for diagnosis. However, such forces cannot be directly measured noninvasively. This study aims to estimate muscle activations and forces exerted during the preparation phase of the single leg triple hop test. Two different approaches were tested: static optimization (SO) and computed muscle control (CMC). As an indirect validation, model-estimated muscle activations were compared with surface electromyography (EMG) of selected hip and thigh muscles...
January 2018: Gait & Posture
https://www.readbyqxmd.com/read/28728471/implementing-technical-refinement-in-high-level-athletics-exploring-the-knowledge-schemas-of-coaches
#14
Philip E Kearney, Howie J Carson, Dave Collins
This paper explores the approaches adopted by high-level field athletics coaches when attempting to refine an athlete's already well-established technique (long and triple jump and javelin throwing). Six coaches, who had all coached multiple athletes to multiple major championships, took part in semi-structured interviews focused upon a recent example of technique refinement. Data were analysed using a thematic content analysis. The coaching tools reported were generally consistent with those advised by the existing literature, focusing on attaining "buy-in", utilising part-practice, restoring movement automaticity and securing performance under pressure...
May 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28675771/kinematic-chain-related-risk-factors-in-the-development-of-lower-extremity-injuries-in-women-a-prospective-study
#15
R Verrelst, D Van Tiggelen, R De Ridder, E Witvrouw
The link between dynamic range of motion (dROM) parameters within the kinematic chain and the development of lower extremity (LE) injury has gained attention; however, very few longitudinal studies have been conducted. Therefore, we wanted to prospectively determine dROM-related risk factors for the development of LE injury. Within this study, 90 female physical education students aged 19.33±0.87 years were tested. Full-body kinematic and vertical ground reaction force (VGRF) parameters were measured during a triple hop jump (THJ)...
February 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28604654/postural-control-in-elite-decathlon-athletes-are-various-modes-of-dynamic-assessment-needed
#16
Sven Reuter, Philipp Forkel, Andreas B Imhoff, Knut Beitzel
BACKGROUND: Decathlon consists of various track and field running, jumping and throwing events. This results in high physical demands and poor postural control may predispose athletes at a higher risk for injury. The purpose of this study was to measure and to show a relationship of different dynamic postural control tests in healthy professional decathlon athletes. METHODS: The German top decathlon team (eight professional athletes, mean age±standard deviation (SD), 20...
July 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28515975/prospective-functional-performance-testing-and-relationship-to-lower-extremity-injury-incidence-in-adolescent-sports-participants
#17
Joseph Smith, Nick DePhillipo, Iris Kimura, Morgan Kocher, Ronald Hetzler
BACKGROUND: Due to the high number of adolescent athletes and subsequent lower extremity injuries, improvements of injury prevention strategies with emphasis on clinic-based and practical assessments are warranted. PURPOSE: The purpose of this study was to prospectively investigate if a battery of functional performance tests (FPT) could be used as a preseason-screening tool to identify adolescent athletes at risk for sports-related acute lower extremity injury via comparison of injured and uninjured subjects...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515972/determination-of-clinically-relevant-differences-in-frontal-plane-hop-tests-in-women-s-collegiate-basketball-and-soccer-players
#18
Kelly Hardesty, Eric J Hegedus, Kevin R Ford, Anh-Dung Nguyen, Jeffrey B Taylor
BACKGROUND: ACL injury prevention programs are less successful in female basketball players than in soccer players. Previous authors have identified anthropometric and biomechanical differences between the athletes and different sport-specific demands, including a higher frequency of frontal plane activities in basketball. Current injury risk screening and preventive training practices do not place a strong emphasis on frontal plane activities. The medial and lateral triple hop for distance tests may be beneficial for use in the basketball population...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28428033/a-critical-analysis-of-limb-symmetry-indices-of-hop-tests-in-athletes-after-anterior-cruciate-ligament-reconstruction-a-case-control-study
#19
A Gokeler, W Welling, A Benjaminse, K Lemmink, R Seil, S Zaffagnini
BACKGROUND: Hop tests are frequently used to determine return to sports (RTS) after anterior cruciate ligament reconstruction (ACLR). Given that bilateral deficits are present after ACLR, this may result in a falsely high limb symmetry index (LSI), since LSI is calculated as a ratio between the values of the limbs. HYPOTHESIS: Athletes after ACLR would achieve LSI>90% for the hop test. Secondly, athletes after ACLR demonstrate decreased jump distance on the single hop for distance (SLH) and triple leg hop for distance (TLH) and decreased number of hops for the side hop (SH) for both involved and uninvolved limbs compared to normative data of sex, age and type of sports matched healthy athletes...
April 17, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28386918/does-increased-heat-resistance-result-in-higher-susceptibility-to-predation-a-test-using-drosophila-melanogaster-selection-and-hardening
#20
S Hangartner, I Dworkin, M DeNieu, A A Hoffmann
Heat resistance of ectotherms can be increased both by plasticity and evolution, but these effects may have trade-offs resulting from biotic interactions. Here, we test for predation costs in Drosophila melanogaster populations with altered heat resistance produced by adult hardening and directional selection for increased heat resistance. In addition, we also tested for genetic trade-offs by testing heat resistance in lines that have evolved under increased predation risk. We show that while 35/37 °C hardening increases heat resistance as expected, it does not increase predation risk from jumping spiders or mantids; in fact, there was an indication that survival may have increased under predation following a triple 37 °C compared to a single 35 °C hardening treatment...
June 2017: Journal of Evolutionary Biology
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