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Landing biomechanics

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https://www.readbyqxmd.com/read/29769819/structural-and-biomechanical-adaptations-to-free-fall-landing-in-hindlimb-cortical-bone-of-growing-female-rats
#1
Hsin-Shih Lin, Ho-Seng Wang, Hung-Ta Chiu, Kuang-You B Cheng, Ar-Tyan Hsu, Tsang-Hai Huang
The purpose of the study was to investigate the adaptation process of hindlimb cortical bone subjected to free-fall landing training. Female Wistar rats (7 weeks old) were randomly assigned to four landing (L) groups and four age-matched control (C) groups (n = 12 per group): L1, L2, L4 L8, C1, C2, C4 and C8. Animals in the L1, L2, L4 and L8 groups were respectively subjected to 1, 2, 4 and 8 weeks of free-fall-landing training (40 cm height, 30 times/day and 5 days/week) while the C1, C2, C4 and C8 groups served as age-matched control groups...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29721837/change-of-direction-biomechanics-is-what-s-best-for-anterior-cruciate-ligament-injury-prevention-also-best-for-performance
#2
REVIEW
Aaron S Fox
Change-of-direction maneuvers (e.g., side-step cutting) are an important aspect of performance in multi-directional sports, but these maneuvers are also associated with anterior cruciate ligament (ACL) injury. Despite this, the impact of biomechanics on ACL injury risk and performance is often examined in isolation. The purpose of this review was to examine the alignment between biomechanical recommendations for ACL injury prevention and performance with regard to change-of-direction maneuvers. Several studies linking change-of-direction biomechanics to both ACL injury risk and performance were examined...
May 2, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29721781/implicit-video-feedback-produces-positive-changes-in-landing-mechanics
#3
Tijana Popovic, Shane V Caswell, Anne Benjaminse, Tarique Siragy, Jatin Ambegaonkar, Nelson Cortes
BACKGROUND: Implicit (IF) and explicit (EF) feedback are two motor learning strategies demonstrated to alter movement patterns. There is conflicting evidence on which strategy produces better outcomes. The purpose of this study was to examine the effects of reduced IF and EF video feedback on lower extremity landing mechanics. METHODS: Thirty participants (24 ± 2 years, 1.7 ± 0.1 m, 70 ± 11 kg) were randomly assigned to three groups: IF (n = 10), EF (n = 10), and control (CG) (n = 10)...
May 2, 2018: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29700560/greater-fear-of-reinjury-is-related-to-stiffened-jump-landing-biomechanics-and-muscle-activation-in-women-after-acl-reconstruction
#4
Stephanie M Trigsted, Dane B Cook, Kristen A Pickett, Lisa Cadmus-Bertram, Warren R Dunn, David R Bell
PURPOSE: Fear of reinjury is an important factor in determining who returns to sport following anterior cruciate ligament reconstruction (ACLR). Evidence from other musculoskeletal injuries indicates fear of reinjury may be related to stiffened movement patterns observed in individuals following ACLR. The relationship between fear of reinjury and performance on dynamic tasks, however, has not been investigated. Therefore, the purpose of this study was to investigate the relationship between fear of reinjury and jump-landing biomechanics...
April 26, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29671383/sport-specific-biomechanical-responses-to-an-acl-injury-prevention-programme-a-randomised-controlled-trial
#5
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament (ACL) injury prevention programmes have not been as successful at reducing injury rates in women's basketball as in soccer. This randomised controlled trial (ClinicalTrials.gov #NCT02530333) compared biomechanical adaptations in basketball and soccer players during jump-landing activities after an ACL injury prevention programme. Eighty-seven athletes were cluster randomised into intervention (6-week programme) and control groups. Three-dimensional biomechanical analyses of drop vertical jump (DVJ), double- (SAG-DL) and single-leg (SAG-SL) sagittal, and double- (FRONT-DL) and single-leg (FRONT-SL) frontal plane jump landing tasks were tested before and after the intervention...
April 19, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29670666/passive-cushiony-biomechanics-of-head-protection-in-falling-geckos
#6
Hao Wang, Wenbo Wang, Yi Song, Lei Cai, Zhendong Dai
Gekko geckos are capable to crawl on the steep even on upside-down surfaces. Such movement, especially at great altitude, puts them at high risks of incidentally dropping down and inevitable body or head impactions, though they may trigger air-righting reaction (ARR) to attenuate the landing shocks. However, the air-righting ability (ARA) in Gekko geckos is not fully developed. The implementation of ARR in some geckos is quite slow; and for those without tails, the ARR is even unobservable. Since ARA is compromised in Gekko geckos , there must be some other mechanisms responsible for protecting them from head injuries during falls...
2018: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29667844/lower-extremity-biomechanics-during-a-drop-vertical-jump-in-participants-with-or-without-chronic-ankle-instability
#7
C Collin Herb, Kaitlyn Grossman, Mark A Feger, Luke Donovan, Jay Hertel
CONTEXT:   Chronic ankle instability (CAI) is a condition characterized by range-of-motion, neuromuscular, and postural-control deficits and subjective disability, reinjury, and posttraumatic osteoarthritis. Differences have been reported in kinematics, kinetics, surface electromyography (EMG), and ground reaction forces during functional tasks performed by those with CAI. These measures are often collected independently, and the research on collecting measures simultaneously during a movement task is limited...
April 18, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29662914/ligament-strain-response-between-lower-extremity-contralateral-pairs-during-in-vitro-landing-simulation
#8
April L McPherson, Nathanial A Bates, Nathan D Schilaty, Christopher V Nagelli, Aaron J Krych, Timothy E Hewett
Background: Limb asymmetries, as determined through in vivo biomechanical measures, are known risk factors for anterior cruciate ligament (ACL) injury. Previous cadaveric studies have shown a lack of significant differences in ligament strain between contralateral lower extremities when identical kinematics were simulated on specimens. Recent methodological developments have applied in vivo knee kinetics to exert landing forces on cadaveric lower extremities to mimic ACL injury events, but it is unknown whether contralateral limbs fail in a consistent manner during impact simulator testing...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29619806/the-influence-of-single-leg-landing-direction-on-lower-limbs-biomechanics
#9
Antonio Dello Iacono, Moshe Ayalon, Weijie Wang
BACKGROUND: The purpose of this study was to investigate whether different directions of single-leg landing tasks would influence lower limbs joints biomechanics. METHODS: Using a controlled and experimental design, thirty physically active male subjects (age: 26.4 ± 4.4 years; height: 180.5 ± 3.7 cm; weight: 79.8: ± 4.4 kg), by dropping down from the top of a wooden box of 31 cm height, performed three one-leg landing tasks featured by different landing directions: frontward (FL), lateral (LL), and rotational (RL)...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29613821/lower-extremity-kinematics-differed-between-a-controlled-drop-jump-and-volleyball-takeoffs
#10
Bradley S Beardt, Myranda R McCollum, Taylour J Hinshaw, Jacob S Layer, Margaret A Wilson, Qin Zhu, Boyi Dai
Previous studies utilizing jump-landing biomechanics to predict anterior cruciate ligament injuries have shown inconsistent findings. The purpose of this study was to quantify the differences and correlations in jump-landing kinematics between a drop-jump, a controlled volleyball-takeoff, and a simulated-game volleyball-takeoff. Seventeen female volleyball players performed these three tasks on a volleyball court while three-dimensional kinematic data were collected by three calibrated camcorders. Participants demonstrated significantly increased jump height, shorter stance time, increased time differences in initial contact between two feet, increased knee and hip flexion at initial contact and decreased peak knee and hip flexion for both left and right legs, and decreased knee-ankle distance ratio at the lowest height of mid-hip for the two volleyball-takeoffs compared with the drop-jump (p < 0...
April 3, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29602303/hop-distance-symmetry-does-not-indicate-normal-landing-biomechanics-in-adolescent-athletes-with-recent-anterior-cruciate-ligament-reconstruction
#11
Tishya A L Wren, Nicole M Mueske, Christopher H Brophy, J Lee Pace, Mia J Katzel, Bianca R Edison, Curtis D VandenBerg, Tracy L Zaslow
Study Design Retrospective cohort. Background Return to sport (RTS) protocols after anterior cruciate ligament reconstruction (ACLR) often include assessment of hop distance symmetry. However, it is unclear if movement deficits are present regardless of hop symmetry. Objectives To assess biomechanics and symmetry of adolescent athletes following ACLR during a single leg hop for distance. Methods Forty-six patients with ACLR (5-12 months post-surgery; 27 female; age 15.6, SD 1.7 years) were classified as asymmetric (operative limb hop distance <90% of non-operative limb; n=17) or symmetric (n=29)...
March 30, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29599866/impact-of-official-matches-on-soccer-referees-power-performance
#12
Daniel Castillo, Javier Yanci, Jesús Cámara
The evaluation of match officials' neuromuscular performance is now an important consideration and the vertical jump test is considered suitable for assessing lower limb power, partly because it is directly related to refereeing. The aim of this study, therefore, was to determine the effect of soccer matches on match officials' vertical jump performance by assessing various biomechanical variables. Eighteen field referees (FRs) and 36 assistant referees (ARs) who officiated in 18 official matches participated in this study...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29584523/brain-behavior-mechanisms-for-the-transfer-of-neuromuscular-training-adaptions-to-simulated-sport-initial-findings-from-the-train-the-brain-project
#13
Dustin R Grooms, Adam W Kiefer, Michael A Riley, Jonathan D Ellis, Staci Thomas, Katie Kitchen, Christopher DiCesare, Scott Bonnette, Brooke Gadd, Kim D Barber Foss, Weihong Yuan, Paula Silva, Ryan Galloway, Jed Diekfuss, James Leach, Kate Berz, Gregory D Myer
CONTEXT: A limiting factor for reducing anterior cruciate ligament (ACL) injury risk is ensuring that the movement adaptions made during the prevention program transfer to sport-specific activity. Virtual reality provides a mechanism to assess transferability and neuroimaging provides a means to assay the neural processes allowing for such skill transfer. OBJECTIVE: To determine the neural mechanisms for injury risk reducing biomechanics transfer to sport after ACL injury prevention training...
March 27, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29581289/energetic-tradeoffs-control-the-size-distribution-of-aquatic-mammals
#14
William Gearty, Craig R McClain, Jonathan L Payne
Four extant lineages of mammals have invaded and diversified in the water: Sirenia, Cetacea, Pinnipedia, and Lutrinae. Most of these aquatic clades are larger bodied, on average, than their closest land-dwelling relatives, but the extent to which potential ecological, biomechanical, and physiological controls contributed to this pattern remains untested quantitatively. Here, we use previously published data on the body masses of 3,859 living and 2,999 fossil mammal species to examine the evolutionary trajectories of body size in aquatic mammals through both comparative phylogenetic analysis and examination of the fossil record...
March 26, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29579620/ground-reaction-forces-during-a-drop-vertical-jump-impact-of-external-load-training
#15
Jeffrey D Simpson, Brandon L Miller, Eric K O'Neal, Harish Chander, Adam C Knight
External load training (ELT) is a supplemental training method used to potentially improve high intensity task performance. However, biomechanical parameters such as ground reaction forces (GRF), ground contact time, and time to peak GRF during a drop vertical jump (DVJ) following an ELT intervention have yet to be examined. Therefore, this study investigated the impact of ELT on certain biomechanical parameters of a DVJ task. Well-trained females stratified into two groups (ELT = 9, Control = 10) completed a DVJ from a 45...
March 23, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29577827/the-transfer-of-strength-and-power-into-the-stroke-biomechanics-of-young-swimmers-over-a-34-week-period
#16
Jorge E Morais, António J Silva, Nuno D Garrido, Daniel A Marinho, Tiago M Barbosa
The purpose of this study was to learn the interplay between dry-land strength and conditioning, and stroke biomechanics in young swimmers, during a 34-week training programme. Twenty-seven swimmers (overall: 13.33 ± 0.85 years old; 11 boys: 13.5 ± 0.75 years old; 16 girls: 13.2 ± 0.92 years old) competing at regional- and national-level competitions were evaluated. The swimmers were submitted to a specific in-water and dry-land strength training over 34 weeks (and evaluated at three time points: pre-, mid-, and post-test; M1, M2, and M3, respectively)...
March 24, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29568787/sex-based-differences-in-knee-kinetics-with-anterior-cruciate-ligament-strain-on-cadaveric-impact-simulations
#17
Nathan D Schilaty, Nathaniel A Bates, Christopher Nagelli, Aaron J Krych, Timothy E Hewett
Background: Females are at an increased risk of sustaining noncontact knee ligament injuries as compared with their male counterparts. The kinetics that load the anterior cruciate ligament (ACL) are still under dispute in the literature. Purpose/Hypothesis: The purpose of this study was to determine whether there are differences in knee kinetics between the sexes that lead to greater ACL strain in females when similar external loads are applied during a simulated drop vertical jump landing task...
March 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29562832/kinematic-and-kinetic-differences-between-left-and-right-handed-professional-baseball-pitchers
#18
Alek Z Diffendaffer, Glenn S Fleisig, Brett Ivey, Kyle T Aune
While 10% of the general population is left-handed, 27% of professional baseball pitchers are left-handed. Biomechanical differences between left- and right-handed college pitchers have been previously reported, but these differences have yet to be examined at the professional level. Therefore, the purpose of this study was to compare pitching biomechanics between left- and right-handed professional pitchers. It was hypothesised that there would be significant kinematic and kinetic differences between these two groups...
March 21, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29530624/the-skeletal-trauma-resulting-from-a-fatal-b-a-s-e-jump-a-case-study-showing-the-impact-of-landing-feet-first-under-extreme-vertical-deceleration
#19
Samantha K Rowbotham, Soren Blau, Jacqueline Hislop-Jambrich
The term 'B.A.S.E jump' refers to jumping from a building, antenna, span (i.e., bridge) or earth (i.e., cliff) structure, and parachuting to the ground. There are numerous hazards associated with B.A.S.E jumps which often result in injury and, occasionally, fatality. This case report details the skeletal trauma resulting from a fatal B.A.S.E jump in Australia. In this case, the jumper impacted the ground from a fall of 439m in a feet-first landing position, as a result of a partially deployed parachute, under extreme vertical deceleration...
May 2018: Forensic Science International
https://www.readbyqxmd.com/read/29528687/peak-lower-extremity-landing-kinematics-in-dancers-and-nondancers
#20
Bethany L Hansberger, Shellie Acocello, Lindsay V Slater, Joseph M Hart, Jatin P Ambegaonkar
CONTEXT:   Anterior cruciate ligament (ACL) injuries often occur during jump landings and can have detrimental short-term and long-term functional effects on quality of life. Despite frequently performing jump landings, dancers have lower incidence rates of ACL injury than other jump-landing athletes. Planned versus unplanned activities and footwear may explain differing ACL-injury rates among dancers and nondancers. Still, few researchers have compared landing biomechanics between dancers and nondancers...
April 2018: Journal of Athletic Training
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