Pose estimation and motion analysis of ski jumpers based on ECA-HRNet.

Ski jumping is a high-speed sport, which makes it difficult to accurately analyze the technical motion in a subjective way. To solve this problem, we propose an image-based pose estimation method for analyzing the motion of ski jumpers. First, an image keypoint dataset of ski jumpers (KDSJ) was constructed.

Muscle Contributions to Take-Off Velocity in the Long Jump.

Purpose: A key determinant of long jump performance is the ability to increase the vertical velocity of the center of mass (COM) while minimizing the loss in forward velocity (running speed) during the take-off phase, but exactly how this occurs is not fully understood. We combined a three-dimensional musculoskeletal model of the body with dynamic optimization theory to simulate the biomechanics of the long jump take-off and determine the contributions of the individual leg muscles to jump performance.

Methods: The body was modeled as a 29-degree-of-freedom skeleton actuated by a combination of muscles and net joint torques.

Effectiveness of ultrasound guided dry needling in management of jumper's knee: a randomized controlled trial.

Jumper's knee is highly prevalent condition in athletes. Very limited evidence is available on clinical effects of tendon dry needling. Therefore, the objective of this study is to compare the effects of ultrasound-guided dry needling (UG-DN) combined with conventional physical therapy and conventional physical therapy alone in patients with jumper's knee.

Knee, Low Back, and Shoulder Problems Among University and Professional Volleyball Players: Playing With Pain.

Context: The knee, low back, and shoulder account for most overuse injuries in volleyball. Previous researchers have used methodology that did not examine the extent of injury burden and effect on performance.

Objective: To develop a more accurate and complete understanding regarding the weekly prevalence and burden of knee, low back, and shoulder problems within the highest levels of men's volleyball, including the role that preseason complaints, match participation, player position, team, and age have on complaints.

Key transition technology of ski jumping based on inertial motion unit, kinematics and dynamics.

Background: The development and innovation of biomechanical measurement methods provide a solution to the problems in ski jumping research. At present, research on ski jumping mostly focuses on the local technical characteristics of different phases, but studies on the technology transition process are less.

Objectives: This study aims to evaluate a measurement system (i.

Arabic Translation and Cross-Cultural Adaptation of the Victorian Institute of Sport Assessment Questionnaire for Patellar Tendinopathy.

Background: The Victorian Institute of Sport Assessment questionnaire for patellar tendinopathy (VISA-P) is currently not available in the Arabic language.

Purpose: To translate and culturally adapt the VISA-P questionnaire into Arabic and to evaluate its reliability and validity.

Study Design: Cohort study (diagnosis); Level of evidence, 3.

Treatment of Jumper's Knee with Extracorporeal Shockwave Therapy: A Systematic Review and Meta-Analysis.

The aim of this systematic review and meta-analysis was to determine the therapeutic efficacy of extracorporeal shockwave therapy (ESWT) for athletes with patellar tendinopathy. We searched PubMed, EBSCOHost and Ovid for randomized controlled trials (RCTs) which evaluated the therapeutic efficacy of ESWT in athletes with jumper's knee. The methodological quality of RCTs was rated with the Physiotherapy Evidence Database scale.

Efficacy of ultrasound guided dry needling as an adjunct to conventional physical therapy for patients with jumper's knee: A randomized controlled trial.

Background: Jumper's knee is a degenerative condition among athletes, and it has been treated with conventional physical therapy (CPT). Ultrasound guided dry needling (USG-DN) is a relatively new technique to explore clinical outcomes in patients with tendinopathy.

Methods: This parallel group, single-blinded randomized controlled trial was carried out involving 94 athletes with clinically diagnosed jumper's knee, divided into an intervention group (USG-DN + CPT, = 47) and a control group (CPT, = 47).

Are Current Prophylactic Programs Effective in Preventing Patellar Tendinopathy in Athletes and Recruits? A Meta-Analysis and Trial Sequential Analysis.

Context: Patellar tendinopathy (PT), or jumper's knee, is a chronic painful overuse patellar tendon injury. For PT, prevention is more important than treatment. However, there is still a lack of strong evidence to confirm the effectiveness of prevention.

Modulating the Nordic Hamstring Exercise From "Zero to Hero": A Stepwise Progression Explored in a High-Performance Athlete.

Background: The Nordic hamstring exercise (NHE) is commonly implemented to selectively improve eccentric knee-flexor strength. However, the standard version of the exercise (leveled shanks, extended hip joint) is too strenuous for most individuals, whose muscle activity rapidly decreases at extended knee angles. Hitherto, a gradual approach to the exercise has been missing.

ICON 2020-International Scientific Tendinopathy Symposium Consensus: A Scoping Review of Psychological and Psychosocial Constructs and Outcome Measures Reported in Tendinopathy Clinical Trials.

Objective: To identify and describe the psychological and psychosocial constructs and outcome measures used in tendinopathy research.

Design: Scoping review.

Literature Search: We searched the PubMed, EMBASE, Scopus, Web of Science, PEDro, CINAHL, and APA PsychNet databases on July 10, 2021, for all published studies of tendinopathy populations measuring psychological and psychosocial factors.

Biomechanical Research on Special Ability of Long Jump Take-Off Muscle Based on Multisource Information Fusion.

For athletes of different sports, their muscle activities in different sports will show different special characteristics according to different sports. The purpose of this paper is to study the technology of multi-information fusion and to study the athletes of the long jump competition. The relevant research on the muscle specific ability test methods of the athletes in the long jump competition is of great significance to the study of the long jump.

Knee dynamics during take-off and landing in spike jumps performed by volleyball players with patellar tendinopathy.

[Purpose] Patellar tendinopathy is a common sports injury. The risk factors for this injury can be categorized as intrinsic, extrinsic, and dynamic. We examined the dynamic factors in this study.

Relationships between tendon structure and clinical impairments in patients with patellar tendinopathy.

The clinical relevance of altered tendon structure in patellar tendinopathy is contested since structural change persists after symptom resolution. The purpose of this study was to explore the relationships between tendon structure and clinical impairments in patellar tendinopathy. In this retrospective, secondary analysis of individuals with patellar tendinopathy (n = 41), tendon structure (thickness, cross-sectional area [CSA], shear modulus, and viscosity), symptom severity, lower extremity function (counter-movement jump [CMJ] height), and quadriceps muscle performance (knee extension force and central activation ratio [CAR]) were recorded for the symptomatic limb.

Association of Ankle Dorsiflexion and Landing Forces in Jumping Athletes.

Background: Dorsiflexion range of motion restriction has been associated with patellar tendinopathy, but the mechanisms of how dorsiflexion restriction could contribute to knee overload remain unknown.

Hypothesis: Peak ankle dorsiflexion and ankle dorsiflexion excursion are negatively associated with peak vertical ground-reaction force (vGRF) and loading rate, and with peak patellar tendon force and loading rate, and positively associated with peak ankle plantar flexor moment.

Study Design: Cross-sectional study.

Variable Heights Influence Lower Extremity Biomechanics and Reactive Strength Index during Drop Jump: An Experimental Study of Male High Jumpers.

Introduction: This study finds the lower limbs' reactive strength index and biomechanical parameters on variable heights.

Objective: This research aims to reveal the effects of drop height on lower limbs' reactive strength index and biomechanical parameters.

Methods: Two AMTI force platforms and Vicon motion capture system were used to collect kinematic and dynamic signals of the lower limbs.

Injuries in elite women's ski jumping: a cohort study following three International Ski Federation (FIS) World Cup seasons from 2017-2018 to 2019-2020.

Objectives: To define incidence and injury patterns of International Ski Federation (FIS) World Cup (WC) women ski jumpers over three seasons.

Methods: Ski jump athletes competing in the Women's FIS WC were recruited for prospective injury surveillance from 2017-2018 to 2019-2020. Team representatives recruited the athletes annually and prospectively recorded all injuries requiring medical attention.

Preventive effect of tailored exercises on patellar tendinopathy in elite youth athletes: A cohort study.

Objective: To investigate the effects of an intervention with tailored exercises on the incidence of patellar tendinopathy (PT) in elite youth jumping athletes.

Design: Prospective crossover cohort.

Setting: One sport club facility.

The Burden and Risk Factors of Patellar and Achilles Tendinopathy in Youth Basketball: A Cohort Study.

This study aimed at evaluating the burden and risk factors of patellar and Achilles tendinopathy among youth basketball players. Patellar and Achilles tendinopathy were prospectively monitored in 515 eligible male and female youth basketball players (11-18 years) through a competitive season. Overall, the season prevalence of patellar tendinopathy was 19.