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Landing biomechanics

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
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...
September 16, 2016: American Journal of Sports Medicine
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
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
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
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
Timothy E Hewett, Kevin R Ford, Yingying Y Xu, Jane Khoury, Gregory D Myer
BACKGROUND: The widespread use of anterior cruciate ligament (ACL) injury prevention interventions has not been effective in reducing the injury incidence among female athletes who participate in high-risk sports. PURPOSE/HYPOTHESIS: The purpose of this study was to determine if biomechanical and neuromuscular factors that contribute to the knee abduction moment (KAM), a predictor of future ACL injuries, could be used to characterize athletes by a distinct factor...
July 29, 2016: American Journal of Sports Medicine
Daniel K Schneider, Alli Gokeler, Bert Otten, Kevin R Ford, Timothy E Hewett, Jon Divine, Angelo J Colosimo, Robert S Heidt, Gregory D Myer
A mass-spring-damper model may serve as an extension of biomechanical data from three-dimensional motion analysis and epidemiological data which help to delineate populations at-risk for anterior cruciate ligament (ACL) injuries. The purpose of this study was to evaluate such a model.\Thirty-six ACL reconstruction (ACLR) group subjects and 67 controls (CTRL) completed single-leg drop landing and single-leg broad jump tasks. Landing ground reaction force data were collected and analyzed with a mass-spring damper model...
July 19, 2016: Journal of Strength and Conditioning Research
J Dallinga, A Benjaminse, A Gokeler, N Cortes, E Otten, K Lemmink
Video feedback may be a powerful tool to change biomechanical landing patterns associated with anterior cruciate ligament (ACL) injury risk. This study investigated the effect of video feedback on drop vertical jump (DVJ) landing strategies in team sport athletes. 59 athletes were assigned to a video feedback (VI) or control (CTRL) group. A pretest, 2 training sessions and a posttest were conducted. In both training sessions, video feedback, consisting of a video of the athlete's contour superimposed onto an expert's contour performing the DVJ landing task, was provided to the VI group; the CTRL group did not receive feedback...
July 18, 2016: International Journal of Sports Medicine
Dello Iacono Antonio, Domenico Martone, Mirjana Milic, Padulo Johnny
This study aimed to assess the chronic effects of vertical and horizontal drop-jump-based protocols on neuromuscular explosive abilities such as jumping, sprinting, and change of direction (COD). Eighteen elite male handball players (age 23.4 ± 4.6 years; height 192.5 ± 3.7 cm; weight 87.8 ± 7.4 kg) were assigned to either vertical drop jump (VDJ) or horizontal drop jump (HDJ) group training twice a week for 10 weeks. Participants performed 5-8 sets × 6-10 repetitions of vertical-alternate (VDJ) or horizontal-alternate (HDJ) one-leg drop-jumps, landing from the top of a platform 25 cm in height...
July 7, 2016: Journal of Strength and Conditioning Research
Wilbert VAN DE Eijnde, Kenneth Meijer, Edwin Lamers, Malou Peppelman, Piet VAN Erp
BACKGROUND: Currently, there is a shortage of biomechanical data regarding acute skin injury mechanisms that are involved in player-surface contact in soccer on artificial turf. It is hypothesized that peak loads on the skin during the landing phase are an important factor in causing an acute skin injury. METHODS: Simultaneously, video analysis and load measurements using an in-ground force plate of the landing phase of a sliding tackle were recorded and correlated with observed clinical skin lesions...
July 6, 2016: Journal of Sports Medicine and Physical Fitness
Timothy A Sayer, Alessandro Timmi, Karine Fortin, Kade L Paterson, Rana S Hinman, Kim L Bennell, Peter Pivonka, Adam L Bryant
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Jae P Yom, Scott Arnett, Kathy Jean Simpson
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Donna M Scarborough, Eric M Berkson, Valerie A Cohen, Luke S Oh
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Joshua D Winters, John Abt, Takashi Nagai, Brad Lambert, Capt Necia Williams, Nicholas Heebner, Scott Royer, Scott Lephart
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Alex Marki, Edgar Gutierrez, Zbigniew Mikulski, Alex Groisman, Klaus Ley
Neutrophils rolling at high shear stress (above 6 dyn/cm(2)) form tethers in the rear and slings in the front. Here, we developed a novel photo-lithographically fabricated, silicone(PDMS)-based side-view flow chamber to dynamically visualize tether and sling formation. Fluorescently membrane-labeled mouse neutrophils rolled on P-selectin substrate at 10 dyn/cm(2). Most rolling cells formed 5 tethers that were 2-30 μm long. Breaking of a single tether caused a reproducible forward microjump of the cell, showing that the tether was load-bearing...
2016: Scientific Reports
Joanne L Parsons, Richard Sylvester, Michelle M Porter
OBJECTIVE: To investigate the effect of leg-focused strength training on the jump-landing mechanics of young female athletes. DESIGN: Single-blind, randomized controlled clinical trial. SETTING: University-based training program. PARTICIPANTS: Forty female athletes, 10 to 14 years old, were randomly allocated to intervention or active control. INTERVENTIONS: Twice weekly training was performed by the leg strengthening group [intervention group (IG); n = 19] and the active control group (CG; n = 17), for 12 weeks...
June 22, 2016: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
Andrew D Nordin, Janet S Dufek
Our purpose was to examine changes in single-leg landing biomechanics and movement control following alterations in mechanical task demands via external load and landing height. We examined lower-extremity kinematic, kinetic, and electromyographic (EMG) adjustments, as well as changes in movement control from neuromechanical synergies using separate principal component analyses (PCA). Nineteen healthy volunteers (15M, 4F, age: 24.3±4.9y, mass: 78.5±14.7kg, height: 1.73±0.08m) were analyzed among 9 single-leg drop landing trials in each of 6 experimental conditions (3 load and 2 landing height) computed as percentages of subject bodyweight (BW, BW+12...
October 2016: Human Movement Science
Anna Ruth Mason-Mackay, Chris Whatman, Duncan Reid, Anna Lorimer
OBJECTIVES: Investigate the impact of lace-up ankle braces on landing biomechanics. DESIGN: Within-subject repeated measures. Participants completed a drop jump, drop land, and netball-specific task in braced and unbraced conditions. SETTING: Biomechanical research laboratory. PARTICIPANTS: Twenty female high school netballers. MAIN OUTCOME MEASURES: Leg, knee, and ankle stiffness, knee/ankle stiffness ratio, knee and ankle sagittal excursion, peak vertical ground reaction force, time-to-peak vertical ground reaction force, and loading rate...
July 2016: Physical Therapy in Sport
Andrew A Tran, Corey Gatewood, Alex H S Harris, Julie A Thompson, Jason L Dragoo
BACKGROUND: Identification of biomechanical risk factors associated with anterior cruciate ligament (ACL) injury can facilitate injury prevention. The purpose of this study is to investigate the effects of three foot landing positions, "toe-in", "toe-out" and "neutral", on biomechanical risk factors for ACL injury in males and females. The authors hypothesize that 1) relative to neutral, the toe-in position increases the biomechanical risk factors for ACL injury, 2) the toe-out position decreases these biomechanical risk factors, and 3) compared to males, females demonstrate greater changes in lower extremity biomechanics with changes in foot landing position...
December 2016: Journal of Experimental Orthopaedics
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