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Landing biomechanics

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https://www.readbyqxmd.com/read/28203593/effects-of-sex-and-fatigue-on-biomechanical-measures-during-the-drop-jump-task-in-children
#1
Kristín Briem, Kolbrún Vala Jónsdóttir, Árni Árnason, Þórarinn Sveinsson
BACKGROUND: Female athletes have a higher rate of anterior cruciate ligament (ACL) injury than males from adolescence and into maturity, which is suggested to result from sex-specific changes in dynamic movement patterns with maturation. Few studies have studied movement strategies and response to fatigue in children. PURPOSE: To evaluate the effect of fatigue on biomechanical variables associated with increased risk for ACL injury during a drop-jump (DJ) performance in children...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28173788/real-time-optimized-biofeedback-utilizing-sport-techniques-robust-a-study-protocol-for-a-randomized-controlled-trial
#2
Jeffrey B Taylor, Anh-Dung Nguyen, Mark V Paterno, Bin Huang, Kevin R Ford
BACKGROUND: Anterior cruciate ligament (ACL) injuries in female athletes lead to a variety of short- and long-term physical, financial, and psychosocial ramifications. While dedicated injury prevention training programs have shown promise, ACL injury rates remain high as implementation has not become widespread. Conventional prevention programs use a combination of resistance, plyometric, balance and agility training to improve high-risk biomechanics and reduce the risk of injury. While many of these programs focus on reducing knee abduction load and posture during dynamic activity, targeting hip extensor strength and utilization may be more efficacious, as it is theorized to be an underlying mechanism of injury in adolescent female athletes...
February 7, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28165760/comparison-of-acl-strain-in-the-mcl-deficient-and-mcl-reconstructed-knee-during-simulated-landing-in-a-cadaveric-model
#3
Eric J Mancini, Robert Kohen, Amanda O Esquivel, Allison M Cracchiolo, Stephen Edward Lemos
BACKGROUND: Noncontact anterior cruciate ligament (ACL) injury after valgus landing has been reported and studied biomechanically. However, the role of the medial collateral ligament (MCL) in dissipating these forces has not been fully elucidated. Purpose/Hypothesis: The purpose of this study was to investigate the role that the MCL plays in ACL strain during simulated landing. The hypothesis was that ACL strain would increase significantly in MCL-incompetent knees compared with the native knee and that reconstructing the MCL would return the values to those of the intact knee...
February 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28160657/patellar-tendon-straps-decrease-pre-landing-quadriceps-activation-in-males-with-patellar-tendinopathy
#4
Adam B Rosen, Jupil Ko, Kathy J Simpson, Cathleen N Brown
OBJECTIVE: To determine if patellar tendon straps altered quadriceps' muscle activity during a drop-jump landing in males with and without patellar tendinopathy. DESIGN: Case-control. SETTINGS: Biomechanics Research Laboratory. PARTICIPANTS: Twenty recreationally-active males participated: ten (age = 21.3 ± 2.4 years, height = 182.8 ± 5.3 cm, mass = 81.7 ± 8.6 kg) with patellar tendinopathy; ten (age = 22...
September 13, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28097064/phalangeal-joints-kinematics-during-ostrich-struthio-camelus-locomotion
#5
Rui Zhang, Qiaoli Ji, Gang Luo, Shuliang Xue, Songsong Ma, Jianqiao Li, Lei Ren
The ostrich is a highly cursorial bipedal land animal with a permanently elevated metatarsophalangeal joint supported by only two toes. Although locomotor kinematics in walking and running ostriches have been examined, these studies have been largely limited to above the metatarsophalangeal joint. In this study, kinematic data of all major toe joints were collected from gaits with double support (slow walking) to running during stance period in a semi-natural setup with two selected cooperative ostriches. Statistical analyses were conducted to investigate the effect of locomotor gait on toe joint kinematics...
2017: PeerJ
https://www.readbyqxmd.com/read/28013024/sex-differences-in-total-frontal-plane-knee-movement-and-velocity-during-a-functional-single-leg-landing
#6
Walter L Jenkins, D S Blaise Williams, Kelsey Williams, Josh Hefner, Hannah Welch
OBJECTIVES: Females land with more knee valgus than males. While most studies have evaluated lower extremity mechanics during double leg landing, most sports require single-leg landing from a double or single leg takeoff. Further, knee movement occurs toward both varus and valgus during functional landing. The purpose of this study was to determine if differences exist between females and males in total frontal plane movement and velocity of the knee during single-leg landing. DESIGN: Experimental cohort...
September 6, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/27992246/toe-in-landing-increases-the-ankle-inversion-angle-and-moment-during-single-leg-landing-implications-in-the-prevention-of-lateral-ankle-sprains
#7
Yuta Koshino, Tomoya Ishida, Masanori Yamanaka, Mina Samukawa, Takumi Kobayashi, Harukazu Tohyama
CONTEXT: Identifying the foot positions that are vulnerable to lateral ankle sprains is important for injury prevention. The effects of foot position in the transverse plane on ankle biomechanics during landing are unknown. OBJECTIVE: To examine the effects of toe-in or toe-out positioning on ankle inversion motion and moment during single-leg landing. DESIGN: Repeated measures. SETTING: Motion analysis laboratory. PARTICIPANTS: Eighteen healthy participants (nine men and nine women)...
December 19, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27942700/lower-extremity-biomechanical-demands-during-saut-de-chat-leaps
#8
Danielle N Jarvis, Kornelia Kulig
: In dance, high demands are placed on the lower extremity joints during jumping tasks. The purpose of this study was to compare biomechanical demands placed on the lower extremity joints during the takeoff and landing phases of saut de chat leaps. METHODS: Thirty healthy, experienced dancers with 20.8±4.9 yrs of dance training performed 5 saut de chat leaps. A three-dimensional motion analysis system and force plates were used to collect kinematic and kinetic data...
December 2016: Medical Problems of Performing Artists
https://www.readbyqxmd.com/read/27918689/vertical-jump-biomechanics-altered-with-virtual-overhead-goal
#9
Kevin R Ford, Anh-Dung Nguyen, Eric J Hegedus, Jeffrey B Taylor
Virtual environments with real-time feedback can simulate extrinsic goals that mimic real life conditions. The purpose was to compare jump performance and biomechanics with a physical overhead goal (POG) and with a virtual overhead goal (VOG). Fourteen female subjects participated (age: 18.8±1.1 years, height: 163.2±8.1 cm, weight 63.0±7.9 kg). Sagittal plane trunk, hip, and knee biomechanics were calculated during the landing and take-off phases of DVJ with different goal conditions. Repeated measures ANOVAs determined differences between goal conditions...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27874298/volitional-spine-stabilization-during-a-drop-vertical-jump-from-different-landing-heights-implications-for-anterior-cruciate-ligament-injury
#10
Ram Haddas, Troy Hooper, C Roger James, Phillip S Sizer
CONTEXT: Volitional preemptive abdominal contraction (VPAC) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE: To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN: Controlled laboratory study...
December 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27865130/effects-of-fatigue-on-lower-limb-pelvis-and-trunk-kinematics-and-muscle-activation-gender-differences
#11
Giovanna Camparis Lessi, Ana Flávia Dos Santos, Luis Fylipe Batista, Gabriela Clemente de Oliveira, Fábio Viadanna Serrão
BACKGROUND: Muscle fatigue is associated with biomechanical changes that may lead to anterior cruciate ligament (ACL) injuries. Alterations in trunk and pelvis kinematics may also be involved in ACL injury. Although some studies have compared the effects of muscle fatigue on lower limb kinematics between men and women, little is known about its effects on pelvis and trunk kinematics. The aim of the study was to compare the effects of fatigue on lower limb, pelvis and trunk kinematics and muscle activation between men and women during landing...
February 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27863284/landing-from-different-heights-biomechanical-and-neuromuscular-strategies-in-trained-gymnasts-and-untrained-prepubescent-girls
#12
Α Christoforidou, D A Patikas, E Bassa, I Paraschos, S Lazaridis, C Christoforidis, C Kotzamanidis
The purpose of this study was to examine the biomechanics of the lower limb, during landing in female prepubertal gymnasts and prepubertal untrained girls, aged 9-12years. Ten healthy participants were included in each group and performed five landings from 20, 40, and 60cm. Kinematics, ground reaction forces (GRF) and electromyogram (EMG) from the lateral gastrocnemius, tibialis anterior, and vastus lateralis are presented. Gymnasts had higher vertical GRF and shorter braking phase during landing. Compared to untrained girls, gymnasts exhibited for all examined drop heights more knee flexion before and at ground contact, but less knee flexion at maximum knee flexion position...
February 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27794536/adaptive-patterns-in-aquatic-amniote-bone-microanatomy-more-complex-than-previously-thought
#13
Alexandra Houssaye, P Martin Sander, Nicole Klein
Numerous amniote groups adapted to an aquatic life. This change of habitat naturally led to numerous convergences. The various adaptive traits vary depending on the degree of adaptation to an aquatic life, notably between shallow water taxa still able to occasionally locomote on land and open-marine forms totally independent from the terrestrial environment, but also between surface swimmers and deep divers. As a consequence, despite convergences, there is a high diversity within aquatic amniotes in e.g., shape, size, physiology, swimming mode...
December 2016: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/27777742/phylogenetic-comparisons-of-pedestrian-locomotion-costs-confirmations-and-new-insights
#14
Craig R White, Lesley A Alton, Taryn S Crispin, Lewis G Halsey
The energetic costs for animals to locomote on land influence many aspects of their ecology. Size accounts for much of the among-species variation in terrestrial transport costs, but species of similar body size can still exhibit severalfold differences in energy expenditure. We compiled measurements of the (mass-specific) minimum cost of pedestrian transport (COTmin, mL/kg/m) for 201 species - by far the largest sample to date - and used phylogenetically informed comparative analyses to investigate possible eco-evolutionary differences in COTmin between various groupings of those species...
September 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/27760491/influence-of-short-term-inertial-training-on-swimming-performance-in-young-swimmers
#15
Mariusz Naczk, Artur Lopacinski, Wioletta Brzenczek-Owczarzak, Jarosław Arlet, Alicja Naczk, Zdzisław Adach
The aim of this study was to evaluate the influence of dry-land inertial training (IT) on muscle force, muscle power, and swimming performance. Fourteen young, national-level, competitive swimmers were randomly divided into IT and control (C) groups. The experiment lasted four weeks, during which time both groups underwent their regular swimming training. In addition, the IT group underwent IT using the Inertial Training Measurement System (ITMS) three times per week. The muscle groups involved during the upsweep phase of the arm stroke in front crawl and butterfly stroke were trained...
October 19, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27637264/stiff-landings-are-associated-with-increased-acl-injury-risk-in-young-female-basketball-and-floorball-players
#16
Mari Leppänen, Kati Pasanen, Urho M Kujala, Tommi Vasankari, Pekka Kannus, Sami Äyrämö, Tron Krosshaug, Roald Bahr, Janne Avela, Jarmo Perttunen, Jari Parkkari
BACKGROUND: Few prospective studies have investigated the biomechanical risk factors of anterior cruciate ligament (ACL) injury. PURPOSE: To investigate the relationship between biomechanical characteristics of vertical drop jump (VDJ) performance and the risk of ACL injury in young female basketball and floorball players. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: At baseline, a total of 171 female basketball and floorball players (age range, 12-21 years) participated in a VDJ test using 3-dimensional motion analysis...
February 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27632861/landing-technique-improvements-after-an-aquatic-based-neuromuscular-training-program-in-physically-active-females
#17
Samantha E Scarneo, Hayley J Root, Jessica C Martinez, Craig Denegar, Douglas J Casa, Stephanie M Mazerolle, Catie L Dann, Giselle Aerni, Lindsay J DiStefano
CONTEXT: Neuromuscular training programs (NTPs) improve landing technique and decrease vertical ground reaction forces (VGRF) resulting in injury risk reduction. NTPs in an aquatic environment may elicit the same improvements as land-based programs with reduced joint stress. OBJECTIVE: To examine the effects of an aquatic NTP on landing technique, as measured by the Landing Error Scoring System (LESS) and VGRF, immediately and 4-months following the intervention...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27632838/effects-of-volitional-spine-stabilization-and-lower-extremity-fatigue-on-knee-and-ankle-during-landing-performance-in-a-recurrent-low-back-pain-population
#18
Ram Haddas, Steven F Sawyer, Phillip S Sizer, Toby Brooks, Ming-Chien Chyu, C Roger James
INTRODUCTION: Recurrent LBP (rLBP) and neuromuscular fatigue are independently thought to increase the risk of lower extremity (LE) injury. Volitional preemptive abdominal contraction (VPAC) is thought to improve lumbar spine and pelvis control in individuals with rLBP. The effects of VPAC on fatigued landing performance in individuals with rLBP are unknown. OBJECTIVES: To determine the effects of VPAC and LE fatigue on landing performance in a rLBP population. DESIGN: Cross-sectional pretest-posttest cohort control design...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27591317/amphibious-fish-jump-better-on-land-after-acclimation-to-a-terrestrial-environment
#19
E Brunt, A J Turko, G R Scott, P A Wright
Air and water differ dramatically in density and viscosity, posing different biomechanical challenges for animal locomotion. We asked how terrestrial acclimation influences locomotion in amphibious fish, specifically testing the hypothesis that terrestrial tail flip performance is improved by plastic changes in the skeletal muscle. Mangrove rivulus Kryptolebias marmoratus, which remain largely inactive out of water, were exposed to water or air for 14 days and a subgroup of air-exposed fish was also recovered in water...
September 2, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27508258/single-leg-landing-neuromechanical-data-following-load-and-land-height-manipulations
#20
Andrew D Nordin, Janet S Dufek
Lower extremity sagittal kinematic and kinetic data are summarized alongside electrical muscle activities during single-leg landing trials completed in contrasting external load and landing height conditions. Nineteen subjects were analyzed during 9 landing trials in each of 6 experimental conditions computed as percentages of subject anthropometrics (bodyweight: BW and subject height: H; BW, BW+12.5%, BW+25%, and H12.5%, H25%). Twelve lower extremity variables (sagittal hip, knee, ankle angles and moments, vertical ground reaction force (GRFz), gluteus maximus, biceps femoris, vastus medials, medial gastrocnemius, and tibialis anterior muscles) were assessed using separate principal component analyses (PCA)...
September 2016: Data in Brief
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