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Single leg landing

Xavier García-Massó, Jiri Skypala, Daniel Jandacka, Isaac Estevan
Although a number of different methods have been proposed to assess the time to stabilization (TTS), none is reliable in every axis and no tests of this type have been carried out on children. The purpose of this study was thus to develop a new computational method to obtain TTS using a time-scale (frequency) approach [i.e. continuous wavelet transformation (WAV)] in children. Thirty normally-developed children (mean age 10.16 years, SD = 1.52) participated in the study. Every participant performed 30 single-leg drop jump landings with the dominant lower limb (barefoot) on a force plate from three different heights (15cm, 20cm and 25cm)...
2019: PloS One
Neil Welch, Chris Richter, Kieran Moran, Andy Franklyn-Miller
Welch, N, Richter, C, Moran, K, and Franklyn-Miller, A. Principal component analysis of the associations between kinetic variables in cutting and jumping, and cutting performance outcome. J Strength Cond Res XX(X): 000-000, 2019-The primary aim of this study was to determine which features within the ground reaction force (GRF) trace during cutting are related to performance outcome in different angled cuts. The secondary aim was to understand the relationship between GRF features in a series of maximum strength, explosive strength, and reactive strength tests, and cutting performance outcome...
February 6, 2019: Journal of Strength and Conditioning Research
Jeffrey D Simpson, Ethan M Stewart, Alana J Turner, David M Macias, Samuel J Wilson, Harish Chander, Adam C Knight
While neuromuscular control deficits during inversion perturbations in chronic ankle instability (CAI) cohorts are well documented in the literature, anticipatory motor control strategies to inversion perturbations in CAI are largely unknown. The purpose of this study was to examine neuromuscular control and ankle kinematics in individuals with CAI (n = 15) and matched controls (n = 15) during unexpected and expected single leg drop-landings onto a tilted surface rotated 20° in the frontal plane. Muscle activity from 200 ms pre- to post-landing was recorded from the tibialis anterior (TA), medial gastrocnemius (MG), peroneus longus (PL) and peroneus brevis (PB)...
February 2, 2019: Human Movement Science
Conor Fryer, Matthew P Ithurburn, Michael P McNally, Staci Thomas, Mark V Paterno, Laura C Schmitt
BACKGROUND: Lower extremity landing asymmetries are common and associated with strength deficits after anterior cruciate ligament reconstruction. However, less is known regarding trunk control during landing. This study's hypotheses were that frontal plane trunk excursion during single-leg landing would be greater in young athletes after anterior cruciate ligament reconstruction compared to controls and would be associated with strength deficits. METHODS: Participants included 130 young athletes recently cleared for return-to-sport following anterior cruciate ligament reconstruction and 56 uninjured young athletes...
November 30, 2018: Clinical Biomechanics
Kazuma Uebayashi, Kiyokazu Akasaka, Akihiro Tamura, Takahiro Otsudo, Yutaka Sawada, Yu Okubo, Toby Hall
BACKGROUND: The anterior cruciate ligament (ACL) is often injured during sport. The Star Excursion Balance Test (SEBT) has been used to evaluate ankle and knee stability of the supporting leg while reaching in eight different directions with the non-stance leg. We hypothesized that the SEBT might be useful in categorising ACL injury risk. The purpose of this study was to clarify the relationship between knee valgus alignment during single leg drop landing (SDL) and alignment of the trunk and lower limb during the SEBT...
2019: PloS One
Anne Benjaminse, Kate E Webster, Alexander Kimp, Michelle Meijer, Alli Gokeler
BACKGROUND: Causes of anterior cruciate ligament (ACL) injuries are multifactorial. Anterior cruciate ligament injury prevention should thus be approached from a multifactorial perspective as well. Training to resist fatigue is an underestimated aspect of prevention programs given that the presence of fatigue may play a crucial role in sustaining an ACL injury. OBJECTIVES: The primary objective of this literature review was to summarize research findings relating to the kinematic and kinetic effects of fatigue on single-leg landing tasks through a systematic review and meta-analysis...
January 18, 2019: Sports Medicine
Chris Connaboy, Shawn R Eagle, Caleb Johnson, Shawn Flanagan, Qi Mi, Bradley C Nindl
INTRODUCTION: Musculoskeletal injury rates in military personnel remain unacceptably high. Application of machine learning algorithms could be useful in multivariate models to predict injury in this population. The purpose of this study was to investigate if interaction between individual predictors, using a decision tree model, could be used to develop a population-specific algorithm of lower extremity injury (LEI) risk. METHODS: 140 Air Force Special Forces Operators (27...
December 27, 2018: Medicine and Science in Sports and Exercise
Guilherme S Nunes, Christian John Barton, Fábio Viadanna Serrão
BACKGROUND: Females with patellofemoral pain (PFP) have been reported to land with altered biomechanics in some, but not all studies. Kinematic alterations previously reported may indicate, and relate to potential impairments in absorbing impact. RESEARCH QUESTION: To compare vertical ground reaction force (vGRF) and lower limb kinematics during single-legged drop vertical jumps in females with and without PFP; and establish the relationship between vGRF and kinematics during this task...
December 10, 2018: Gait & Posture
Adam B Rosen, Jupil Ko, Cathleen N Brown
BACKGROUND: Patellar tendinopathy is a common condition resulting in persistent pain, frequently reported during physical activity. The relationship between dynamic postural stability and pain in these individuals is unclear and how it may affect postural stability. RESEARCH QUESTION: Is there a relationship between acute pain and dynamic postural stability indices in individuals with patellar tendinopathy? METHODS: Twenty-two recreationally active individuals with patellar tendinopathy participated...
September 2018: Gait & Posture
Anis Rostami, Amir Letafatkar, Alli Gokeler, Mehdi Khaleghi
CONTEXT: Female volleyball players are more predisposed to anterior cruciate ligament (ACL) injury in comparison with their male counterparts. Recent researches on ACL injury prevention strategies have shown the positive results of adopting the external focus (EF) of attention in sports. OBJECTIVE: This study aimed to determine the effect of six-week EF instruction exercises on performance and kinetic factors associated with lower extremity injury in landing after the volleyball blocks of female athletes...
December 11, 2018: Journal of Sport Rehabilitation
Eun Wook Chang, Samuel Johnson, Christine Pollard, Mark Hoffman, Marc Norcross
BACKGROUND: A functional test battery (FTB) has been proposed to determine return to full activity following anterior cruciate ligament reconstruction (ACLR). However, there is little biomechanical evidence of FTB usefulness. The purpose of this study was to compare knee joint landing and cutting biomechanics between ACLR patients who passed (ACLR-Pass), failed (ACLR-Fail), and healthy females (Healthy) before and after exercise. METHODS: Thirty females were included: 10 ACLR-Pass, eight ACLR-Fail and 12 Healthy...
December 2018: Knee
George D Hoffman, Claire Lande, Sujaya Rao
Honey bees (Apis mellifera L. (Hymenoptera: Apidae)) are effective pollinators of many crops but are thought to be inefficient in pollinating blueberries (Vaccinium corymbosum L.) due to their inability to buzz pollinate. Nonetheless, commercial growers rent honey bee hives for pollination, resulting in the dominance of honey bee workers visiting flowers during bloom. The objective of this study was to examine where on the honey bee pollen is carried and how it is transferred from flower to bee to the stigma of other flowers...
November 19, 2018: Environmental Entomology
Marcus J C Lee, David G Lloyd, Brendan S Lay, Paul D Bourke, Jacqueline A Alderson
Increasing knee stability via appropriate muscle activation could reduce anterior cruciate ligament (ACL) injury risk during unplanned sidestepping. High-level athletes may activate their knee muscles differently from low-level athletes when responding to quasi-game realistic versus non game-realistic stimuli. Eleven high-level and 10 low-level soccer players responded to a non game-realistic arrow-planned condition (AP), a quasi game-realistic one-defender scenario (1DS) and two-defender scenario (2DS), and an arrow-unplanned condition (AUNP), that imposed increasing time constraints to sidestep...
November 19, 2018: Journal of Sports Sciences
Kristin D Morgan, Cyril J Donnelly, Jeffrey A Reinbolt
Anterior cruciate ligament (ACL) injuries are common sports injuries, costing the U.S. roughly $1 billion annually. To better understand the underlying injury mechanism, Nyquist and Bode stability criteria were applied to assess frontal plane dynamic knee stability among male Australian Football players during the weight-acceptance phase of single-leg jump landing. Out of 30 landings, 19 were classified as stable and 11 as unstable. Medial and lateral vasti, hamstring and gastrocnemii muscle activation waveforms were analyzed in parallel to determine if individuals with stable and unstable frontal plane joint biomechanics possessed different lower limb neuromuscular strategies...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Duncan P Fransz, Arnold Huurnink, Idsart Kingma, Vosse A de Boode, Ide C Heyligers, Jaap H van Dieën
BACKGROUND: Soccer has a high injury rate, with lateral ankle sprains being a common injury. Therefore, an approach to prevent or at least reduce the occurrence is warranted. Injury prevention can be improved by identifying specific risk factors and individuals at risk. PURPOSE: To assess drop-jump landing performance as a potential predictor of lateral ankle sprain within 3-year follow-up. STUDY DESIGN: Case-control study; Level of evidence, 3...
December 2018: American Journal of Sports Medicine
Jacopo Emanuele Rocchi, Luciana Labanca, Luca Laudani, Carlo Minganti, Pier Paolo Mariani, Andrea Macaluso
OBJECTIVES: It is well known that alterations in landing mechanics persist for years after anterior cruciate ligament reconstruction (ACL-R). Nevertheless, existing literature is controversial in reporting successful or unsuccessful recovery of prelanding muscle activation timing after ACL-R. The study aimed at comparing myoelectric and kinematic patterns during landing tasks between ACL-R and healthy subjects. DESIGN: Cross-sectional study. SETTING: Institutional research laboratory...
October 29, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
Anna V Lorimer, Justin W L Keogh, Patria A Hume
Background: A review of the literature has indicated that lower body stiffness, defined as the extent to which the lower extremity joints resists deformation upon contact with the ground, may be a useful measure for assessing Achilles injury risk in triathletes. The nature of overuse injuries suggests that a variety of different movement patterns could conceivably contribute to the final injury outcome, any number and combination of which might be observed in a single individual. Measurements which incorporate both kinetics and kinematics (such as stiffness) of a movement may be better able to shed light on individuals at risk of injury, with further analysis then providing the exact mechanism of injury for the individual...
2018: PeerJ
Ana M Azevedo, Raúl Oliveira, João R Vaz, Nelson Cortes
PURPOSE: To compare lower extremity biomechanics between professional dancers (PDs) and non-dancers (NDs) during multidirectional single-leg landings. METHODS: Fifteen PDs (27±7 years, 1.69±0.1m, 57.8±9.3kg), and 15 NDs (25±5 years, 1.69±0.1m, 66±10.2kg) performed single-leg jumps in three directions: 1) lateral, 2) diagonal, and 3) forward. Dominant LE biomechanical data were collected using a motion capture system. Data were processed in Visual3D. LE kinematic (hip, knee and ankle joint angles in sagittal and frontal planes, and range of motion (ROM)) and kinetics (hip and knee internal joint moments and vertical ground reaction force) variables were analyzed at initial contact (IC), peak vertical ground reaction force (PvGRF), and peak knee flexion (PKF)...
October 22, 2018: Medicine and Science in Sports and Exercise
Hunter J Bennett, Kristina Fleenor, Joshua T Weinhandl
Many methodologies exist to predict the hip joint center (HJC), of which regression based on anatomical landmarks appear most common. Despite the fact that predicted HJC locations vary depending upon chosen method, inter-study comparisons and inferences about populations are commonly made. The purpose of this study was to create a normative database of hip and knee biomechanics during walking, running, and single leg landings based on five commonly utilized HJC methods to serve as a reference for inter-study comparisons...
November 16, 2018: Journal of Biomechanics
Brenda Benson Deaver, Tyrel Nelson, Catherine Turner
CONTEXT: Popularity of using handheld devices in clinical settings has increased, especially the use of motion analysis applications (MAA). Video-based measurement tools have been found reliable in measuring knee valgus in subjects without anterior cruciate ligament (ACL) injury. However, there is a need for validation of using a MAA to measure knee valgus in an injured population given that they may exhibit higher degrees of knee valgus. OBJECTIVE: To examine the reliability and validity of using a MAA to measure knee valgus during functional activities used to assess return-to-sport after ACL reconstruction (ACLR)...
October 9, 2018: Journal of Sport Rehabilitation
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