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1,980 results on '"Hewett, Timothy E."'

13. Altered Lower Extremity Intersegmental Coordination in Female Athletes With Dynamic Knee Valgus: A Case-control Study.

Author

Zamankhanpour, Mina, Sheikhhoseini, Rahman, Piri, Hashem, Asadi-Melerdi, Shakiba, Abdollahi, Sajjad, and Hewett, Timothy E.

Abstract

Purpose: Among female athletes, dynamic knee valgus (DKV) is one of the most common injuries, especially anterior cruciate ligament (ACL) injuries. This study aims to compare lower limb coordination in athletes with and without DKV during walking. Methods: In this case-control study, 32 recreational female athletes were recruited in two... [ABSTRACT FROM AUTHOR]

Published
2024
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18. Implementing Velocity-Based Training to Optimize Return to Sprint After Anterior Cruciate Ligament Reconstruction in Soccer Players: A Clinical Commentary

Author

FORELLI, Florian, primary, RIERA, Jérôme, additional, MARINE, Patrice, additional, GASPAR, Maxime, additional, MEMAIN, Geoffrey, additional, MIRAGLIA, Nicholas, additional, NIELSEN – LE ROUX, Mathias, additional, BOUZEKRAOUI ALAOUI, Ismail, additional, KAKAVAS, Georgios, additional, HEWETT, Timothy E, additional, KING, Enda, additional, and RAMBAUD, Alexandre JM, additional

Published
2024
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20. Epidemiology and Factors Influencing Davis Cup Retirements Over the Past Twenty Years.

Author

Casals, Martí, Cortés, Jordi, Llenderrozos, Daniel, Crespo, Miguel, Hewett, Timothy E., Martin, Lorena, and Baiget, Ernest

Subjects
SPORTS injuries risk factors, RISK assessment, STATISTICAL significance, RESEARCH funding, SPORTS injuries, RETIREMENT, TENNIS, FISHER exact test, PROFESSIONAL athletes, RETROSPECTIVE studies, CHI-squared test, DESCRIPTIVE statistics, LONGITUDINAL method, SPORTS events, MEDICAL records, ACQUISITION of data, STATISTICS, CONFIDENCE intervals, DATA analysis software, PSYCHOSOCIAL factors, REGRESSION analysis
Abstract

Background: The demands of professional tennis, including physical and psychological aspects, contribute to the frequency of retirements at elite levels of the sport. Purpose: The aim of this study was to explore the frequency of injuries and the factors that influence the retirements of professional tennis players competing in the Davis Cup over the last two decades. Study Design: Retrospective cohort study. Methods: The data set includes data from 6,060 men's singles matches that included 1,814,141 games from Davis Cup ties played between 2000 to 2019. Factors that might influence the retirements were studied by means of generalized linear models using Poisson distribution. Incidence rates by 1000 games and incidence rate ratios of retirements are provided as association measures. Results: The retirement incidence was 1.05 per 1000 games [95% CI: 0.90, 1.21]. The main risk factors associated with retirements were matches played on hard courts (IRR: 2.52 [95% CI: 1.32, 4.83]) and matches played in the final two matches of the tie and in a best-of-5-set format (IRR: 2.63 [95% CI: 1.69, 4.09] and IRR: 5.52 [95% CI: 3.50, 8.69], respectively). The most common injuries that led to retirements were those affecting the lower extremities, specifically involving muscular or tendinous tissues. Conclusion: This study provides valuable insights for coaches, players, support teams, and epidemiologists regarding retirements and their associated risk factors in Davis Cup tournaments. These findings may guide future research and inform strategies aimed at managing player health and performance in professional tennis. Level of evidence: Level 2b. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Gender-based comparative analysis of knee injury risk during cutting maneuvers in non-professional athletes: a kinetic and kinematic perspective

Author

Universidad de Sevilla. Departamento de Educación Física y Deporte, Universidad de Sevilla.CTS-972: Análisis biológico y funcional del ejercicio físico, Feria Madueño, Adrian, Hewett, Timothy E, Sañudo Corrales, Francisco de Borja, Universidad de Sevilla. Departamento de Educación Física y Deporte, Universidad de Sevilla.CTS-972: Análisis biológico y funcional del ejercicio físico, Feria Madueño, Adrian, Hewett, Timothy E, and Sañudo Corrales, Francisco de Borja

Abstract

This study aimed to compare the risk of knee injury between men and women by integrating kinetic and kinematic parameters in a non- professional athlete population. Two hundred non-professional athletes were re- cruited for the present study. Three change of direction tests were conducted, consisting of two open cuts at 30 (SC 30 ) and 45 degrees (SC 45 ) and one closed cut at 45 degrees (SC 45cl ). Kinetic variables, including three-dimensional force and accelerations in the three axes of movement and ground contact time, were assessed using force platform and accelerometers. The initial and maximum an- gles of the ankle, knee, hip, and trunk were analyzed by photogrammetry. The data was compared between males and females to examine gender differenc- es. Gender analysis demonstrated significant differences in force values, with women displaying higher medial-lateral (ML) force in SC 30 and men exhibiting higher vertical ground reaction force (VGRF) and anterior-posterior (AP) force in SC 45 . Gender-specific analysis indicated higher partial knee accelerations in women during SC30 and SC45 , with significant differences observed in accelera- tion in the vertical axe. Gender differences were observed in certain kinematic variables, with women displaying higher ankle flexion at initial contact in SC 30 and higher ankle flexion at maximum flexion and ankle dorsiflexion range in SC45 . Men showed lower knee flexion angles in both SC 45cl and SC 45 . These find- ings provide valuable insights into the kinetics and kinematics of change of direction movements and highlight gender-specific differences that may have implications for training and injury prevention strategies. Further research is needed to understand the underlying factors contributing to these differences and their impact on performance and injury risk, El objetivo de este estudio fue comparar el riesgo de lesión de rodilla entre hombres y mujeres mediante la integración de parámetros cinéticos y cinemáticos en una población de atletas no profesionales. Doscientos atletas no profesionales fueron reclutados para el presente estudio. Se realizaron tres prue- bas de cambio de dirección, consistentes en dos cortes abiertos a 30 (SC30 ) y 45 grados (SC45 ), y un corte cerrado a 45 grados (SC45cl ). Se evaluaron las variables cinéticas, incluida la fuerza tridimensional, así como las aceleraciones en los tres ejes de movimiento y el tiempo de contacto con el suelo mediante plataforma de fuerza y acelerometría. Se analizaron los ángulos iniciales y máximos del tobillo, la rodilla, la cadera y el tronco a través de fotogrametría. Se realizó una compa- ración de los datos entre hombres y mujeres para examinar las diferencias de género. El análisis de género demostró diferencias significativas en los valores de fuerza, mostrando las mujeres una mayor fuerza medial-lateral (ML) en SC30 , y los hombres una mayor fuerza de reacción vertical al suelo (VGRF) y fuerza an- teroposterior (AP) en SC45 . Los análisis específicos de género indicaron mayores aceleraciones parciales de rodilla en las mujeres durante SC30 y SC45 , observándo- se diferencias significativas en la aceleración en el eje vertical. Se observaron dife- rencias de género en determinadas variables cinemáticas, mostrando las mujeres mayor flexión del tobillo en el contacto inicial en SC30 y mayor flexión del tobillo en flexión máxima y rango de dorsiflexión del tobillo en SC45 . Los hombres mos- traron ángulos de flexión de rodilla más bajos tanto en SC45cl como en SC45 . Estos resultados proporcionan información valiosa sobre la cinética y la cinemática de los movimientos de cambio de dirección y ponen de relieve las diferencias especí- ficas de género que pueden tener implicaciones para las estrategias de entrena- miento y prevención de lesiones. Se necesita más

Published
2024

26. AOSSM Early Sport Specialization Consensus Statement

Author

LaPrade, Robert F, Agel, Julie, Baker, Joseph, Brenner, Joel S, Cordasco, Frank A, Côté, Jean, Engebretsen, Lars, Feeley, Brian T, Gould, Daniel, Hainline, Brian, Hewett, Timothy E, Jayanthi, Neeru, Kocher, Mininder S, Myer, Gregory D, Nissen, Carl W, Philippon, Marc J, and Provencher, Matthew T

Subjects
Biomedical and Clinical Sciences, Health Sciences, Clinical Sciences, Sports Science and Exercise, Pediatric, early sports specialization, consensus, youth sports, Human Movement and Sports Sciences, Clinical sciences, Sports science and exercise
Abstract

BackgroundEarly sport specialization is not a requirement for success at the highest levels of competition and is believed to be unhealthy physically and mentally for young athletes. It also discourages unstructured free play, which has many benefits.PurposeTo review the available evidence on early sports specialization and identify areas where scientific data are lacking.Study designThink tank, roundtable discussion.ResultsThe primary outcome of this think tank was that there is no evidence that young children will benefit from early sport specialization in the majority of sports. They are subject to overuse injury and burnout from concentrated activity. Early multisport participation will not deter young athletes from long-term competitive athletic success.ConclusionYouth advocates, parents, clinicians, and coaches need to work together with the sport governing bodies to ensure healthy environments for play and competition that do not create long-term health issues yet support athletic competition at the highest level desired.

Published
2016

34. Mechanosignaling in Bone Health, Trauma and Inflammation

Author

Knapik, Derrick M, Perera, Priyangi, Nam, Jin, Blazek, Alisa D, Rath, Björn, Leblebicioglu, Binnaz, Das, Hiranmoy, Wu, Lai Chu, Hewett, Timothy E, Agarwal, Suresh K, Robling, Alexander G, Flanigan, David C, Lee, Beth S, and Agarwal, Sudha

Subjects
Osteoporosis, Bioengineering, Underpinning research, 2.1 Biological and endogenous factors, Aetiology, 1.1 Normal biological development and functioning, Musculoskeletal, Animals, Bone and Bones, Humans, Inflammation, Mechanotransduction, Cellular, NF-kappa B, Wounds and Injuries, Biochemistry and Cell Biology, Medical Biochemistry and Metabolomics, Pharmacology and Pharmaceutical Sciences, Biochemistry & Molecular Biology
Abstract

SignificanceMechanosignaling is vital for maintaining the structural integrity of bone under physiologic conditions. These signals activate and suppress multiple signaling cascades regulating bone formation and resorption. Understanding these pathways is of prime importance to exploit their therapeutic potential in disorders associated with bone loss due to disuse, trauma, or disruption of homeostatic mechanisms.Recent advancesIn the case of cells of the bone, an impressive amount of data has been generated that provides evidence of a complex mechanism by which mechanical signals can maintain or disrupt cellular homeostasis by driving transcriptional regulation of growth factors, matrix proteins and inflammatory mediators in health and inflammation. Mechanical signals act on cells in a magnitude dependent manner to induce bone deposition or resorption. During health, physiological levels of these signals are essential for maintaining bone strength and architecture, whereas during inflammation, similar signals can curb inflammation by suppressing the nuclear factor kappa B (NF-κB) signaling cascade, while upregulating matrix synthesis via mothers against decapentaplegic homolog and/or Wnt signaling cascades. Contrarily, excessive mechanical forces can induce inflammation via activation of the NF-κB signaling cascade.Critical issuesGiven the osteogenic potential of mechanical signals, it is imperative to exploit their therapeutic efficacy for the treatment of bone disorders. Here we review select signaling pathways and mediators stimulated by mechanical signals to modulate the strength and integrity of the bone.Future directionsUnderstanding the mechanisms of mechanotransduction and its effects on bone lay the groundwork for development of nonpharmacologic mechanostimulatory approaches for osteodegenerative diseases and optimal bone health.

Published
2014

42. Change in Anterior Cruciate Ligament Graft Choice and Outcomes Over Time

Author

Parker, Richard D., Andrish, Jack T., Jones, Morgan H., Wright, Rick W., Matava, Matthew J., Brophy, Robert H., Marx, Robert G., McCarty, Eric C., Wolcott, Michelle L., Vidal, Armando F., Amendola, Annunziato, Wolf, Brian R., Dunn, Warren R., Kaeding, Christopher C., Pedroza, Angela D., Reinke, Emily K., Huston, Laura J., Hewett, Timothy E., Flanigan, David C., and Spindler, Kurt P.

Published
2017
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