journal
MENU ▼
Read by QxMD icon Read
search

Journal of Applied Biomechanics

journal
https://www.readbyqxmd.com/read/28530502/the-effect-of-stride-length-and-lateral-pelvic-tilt-on-elbow-torque-in-youth-baseball-pitchers
#1
Noah X Tocci, David R Howell, Dai Sugimoto, Corey Dawkins, Amy Whited, Donald Bae
High elbow torque during a pitch may contribute to injury risk. Our objective was to determine the pitch mechanics associated with elbow varus torque in youth baseball pitchers. Eighteen male youth pitchers (age = 15.5 ± 1.6 years) threw 3 fastballs and 3 change-ups from a windup position while undergoing 3-dimensional kinematic analysis. Independent variables included ball release point distance, stride length, lateral pelvic tilt, and ball velocity. Two multiple regression models, separated by pitch type (fastball, change-up) were used to determine the association of independent variables with peak varus torque at the elbow...
September 23, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28530461/increase-in-leg-stiffness-reduces-joint-work-during-backpack-carriage-running-at-slow-velocities
#2
Bernard Liew, Kevin Netto, Susan Morris
Optimal tuning of leg stiffness has been associated with better running economy. Running with a load is energetically expensive, which could have a significant impact on athletic performance where backpack carriage is involved. The purpose of this study was to investigate the impact of load magnitude and velocity on leg stiffness. We also explored the relationship between leg stiffness and running joint work. Thirty-one healthy participants ran overground at 3 velocities (3.0, 4.0, 5.0 m·s(-1)), whilst carrying 3 load magnitudes (0%, 10%, 20% weight)...
September 23, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28338381/a-novel-method-to-compute-breathing-volumes-via-motion-capture-systems-design-and-experimental-trials
#3
Carlo Massaroni, Eugenio Cassetta, Sergio Silvestri
Respiratory assessment can be carried out by using motion capture systems. A geometrical model is mandatory in order to compute the breathing volume as a function of time from the markers' trajectories. This study describes a novel model to compute volume changes and calculate respiratory parameters by using a motion capture system. The novel method, ie, prism-based method, computes the volume enclosed within the chest by defining 82 prisms from the 89 markers attached to the subject chest. Volumes computed with this method are compared to spirometry volumes and to volumes computed by a conventional method based on the tetrahedron's decomposition of the chest wall and integrated in a commercial motion capture system...
September 21, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28338379/head-neck-trunk-and-pelvis-tissue-mass-predictions-for-young-adults-using-anthropometric-measures-and-dual-energy-x-ray-absorptiometry
#4
Danielle L Gyemi, Charles Kahelin, Nicole C George, David M Andrews
Accurate prediction of wobbling mass (WM), fat mass (FM), lean mass (LM), and bone mineral content (BMC) of living people using regression equations developed from anthropometric measures (lengths, circumferences, breadths, skinfolds) has previously been reported, but only for the extremities. Multiple linear stepwise regression was used to generate comparable equations for the head, neck, trunk, and pelvis of young adults (38 males, 38 females). Equations were validated using actual tissue masses from an independent sample of 13 males and 13 females by manually segmenting full-body dual-energy x-ray absorptiometry scans...
September 18, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28253044/wearing-an-inflatable-vest-alters-muscle-activation-and-trunk-angle-while-paddling-a-surfboard
#5
Jeff A Nessler, Thomas Hastings, Kevin Greer, Sean C Newcomer
Low back pain is a commonly reported problem among recreational surfers. Some individuals report that wearing a vest with an inflatable bladder that alters trunk angle may help to alleviate pain. The purpose of this study was to determine whether such a vest has an effect on muscle activation and extension of the lower back. Twelve recreational surfers completed 12 paddling trials at 1.1 m/s in a swim flume on both a shortboard and a longboard on 2 separate days. Three conditions of no vest, vest uninflated, and vest inflated were presented to participants in random order...
September 7, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28084870/reliability-of-achilles-tendon-moment-arm-measured-in-vivo-using-freehand-three-dimensional-ultrasound
#6
Steven J Obst, Lee Barber, Ashton Miller, Rod S Barrett
This study investigated reliability of freehand three-dimensional ultrasound (3DUS) measurement of in vivo human Achilles tendon (AT) moment arm. Sixteen healthy adults were scanned on 2 separate occasions by a single investigator. 3DUS scans were performed over the free AT, medial malleolus, and lateral malleolus with the ankle passively positioned in maximal dorsiflexion, mid dorsiflexion, neutral, mid plantar flexion and maximal plantar flexion. 3D reconstructions of the AT, medial malleolus, and lateral malleolus were created from manual segmentation of the ultrasound images and used to geometrically determine the AT moment arm using both a straight (straight ATMA) and curved (curved ATMA) tendon line-of-action...
September 7, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28084863/load-accommodation-strategies-and-movement-variability-in-single-leg-landing
#7
Andrew D Nordin, Janet S Dufek
Our purpose was to examine changes in participant-specific single-leg landing strategies and intra-individual movement variability following alterations in mechanical task demands via external load and landing height. Nineteen healthy volunteers (15M, 4 F, age: 24.3 ± 4.9 y, mass: 78.5 ± 14.7 kg, height: 1.73 ± 0.08 m) 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 participant bodyweight (BW, BW + 12...
September 7, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28290751/comparison-of-thoracic-and-lumbar-erector-spinae-muscle-activation-before-and-after-a-golf-practice-session
#8
Graeme G Sorbie, Fergal M Grace, Yaodong Gu, Julien S Baker, Ukadike C Ugbolue
Lower back pain is commonly associated with golfers. The study aimed: to determine whether thoracic- and lumbar-erector-spinae muscle display signs of muscular fatigue after completing a golf practice session, and to examine the effect of the completed practice session on club head speed, ball speed and absolute carry distance performance variables. Fourteen right-handed male golfers participated in the laboratory-based-study. Surface electromyography (EMG) data was collected from the lead and trail sides of the thoracic- and lumbar-erector-spinae muscle...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28253068/in-vitro-quantification-of-medial-collateral-ligament-tension-in-the-elbow
#9
Louis M Ferreira, Graham J W King, James A Johnson
The anterior bundle of the medial collateral ligament (AMCL) of the elbow is commonly injured in patients with elbow dislocations and in throwing athletes. This in-vitro study quantified tension in the native AMCL throughout elbow flexion for different arm positions. We conducted passive and simulated active elbow flexion in seven fresh-frozen cadaveric upper extremities using an established motion simulator. Motions were performed in the valgus and vertical positions from 20-120° while measuring AMCL tension using a custom transducer...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28253053/kinematic-gait-patterns-in-competitive-and-recreational-runners
#10
Christian A Clermont, Sean T Osis, Angkoon Phinyomark, Reed Ferber
Certain homogeneous running subgroups demonstrate distinct kinematic patterns in running; however, the running mechanics of competitive and recreational runners are not well understood. Therefore, the purpose of this study was to determine whether we could separate and classify competitive and recreational runners according to gait kinematics using multivariate analyses and a machine learning approach. Participants were allocated to the 'competitive' (n = 20) or 'recreational' group (n = 15) based on age, sex, and recent race performance...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28181833/influence-of-a-full-body-compression-suit-on-trunk-positioning-and-knee-joint-mechanics-during-lateral-movements
#11
Guillaume Mornieux, Elmar Weltin, Monika Pauls, Franz Rott, Albert Gollhofer
Trunk positioning has been shown to be associated with knee joint loading during athletic tasks, especially changes of direction. The purpose of the present study was to test whether a full-body compression suit (FBCS) would improve trunk positioning and knee joint control during lateral movements. Twelve female athletes performed lateral reactive jumps (LRJ) and unanticipated cuttings with and without the customized FBCS, while 3D kinematics and kinetics were measured. FBCS did not influence trunk positioning during LRJ and led to increased trunk lateral lean during cuttings (P < ...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28121227/reliability-of-a-new-medicine-ball-throw-power-test
#12
Mark G L Sayers, Stephen Bishop
The purpose of this study was to examine the reliability of a new upper body medicine ball push-press (MBP-P) test. Twenty-three strength trained volunteers performed a series of supine MBP-P throws using loads representing 5% and10% of their 5RM bench press (5 repetitions at each load). Throws were performed on a force platform (2000 Hz), with medicine ball kinematic data collected using a high-speed motion capture (500 Hz). Testing was repeated after 7-10 days to quantify intertest reliability. Maximal force (Fmax), impulse at Fmax, time to Fmax, and maximum rate of force development (RFDmax) were all calculated from the force platform outputs, with maximum ball velocity (Velmax) and maximum ball acceleration (Accelmax) developed from the kinematic data...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28084875/reliability-and-validity-of-kinetic-and-kinematic-parameters-determined-with-force-plates-embedded-under-a-soil-filled-baseball-mound
#13
Toshimasa Yanai, Akifumi Matsuo, Akira Maeda, Hiroki Nakamoto, Mirai Mizutani, Hiroaki Kanehisa, Tetsuo Fukunaga
We developed a force measurement system in a soil-filled mound for measuring ground reaction forces (GRFs) acting on baseball pitchers and examined the reliability and validity of kinetic and kinematic parameters determined from the GRFs. Three soil-filled trays of dimensions that satisfied the official baseball rules were fixed onto 3 force platforms. Eight collegiate pitchers wearing baseball shoes with metal cleats were asked to throw 5 fastballs with maximum effort from the mound toward a catcher. The reliability of each parameter was determined for each subject as the coefficient of variation across the 5 pitches...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28084868/physiological-and-biomechanical-responses-to-prolonged-heavy-load-carriage-during-level-treadmill-walking-in-females
#14
Daniel E Lidstone, Justin A Stewart, Reed Gurchiek, Alan R Needle, Herman van Werkhoven, Jeffrey M McBride
Heavy load carriage has been identified as a main contributing factor to the high incidence of overuse injuries in soldiers. Peak vertical ground reaction force (VGRFMAX) and maximal vertical loading rates (VLRMAX) may increase during heavy prolonged load carriage with the development of muscular fatigue and reduced shock attenuation capabilities. The objectives of the current study were (1) to examine physiological and biomechanical changes that occur during a prolonged heavy load carriage task, and (2) to examine if this task induces neuromuscular fatigue and changes in muscle architecture...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28084864/inverse-dynamics-modeling-of-paralympic-wheelchair-curling
#15
Brock Laschowski, Naser Mehrabi, John McPhee
Paralympic wheelchair curling is an adapted version of Olympic curling played by individuals with spinal cord injuries, cerebral palsy, multiple sclerosis, and lower extremity amputations. To the best of the authors' knowledge, there has been no experimental or computational research published regarding the biomechanics of wheelchair curling. Accordingly, the objective of the present research was to quantify the angular joint kinematics and dynamics of a Paralympic wheelchair curler throughout the delivery...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28084861/split-belt-treadmill-walking-alters-lower-extremity-frontal-plane-mechanics
#16
Jaimie A Roper, Ryan T Roemmich, Mark D Tillman, Matthew J Terza, Chris J Hass
Interventions that manipulate gait speed may also affect the control of frontal plane mechanics. Expanding the current knowledge of frontal plane adaptations during split-belt treadmill walking could advance our understanding of the influence of asymmetries in gait speed on frontal plane mechanics and provide insight into the breadth of adaptations required by split-belt walking (SBW). Thirteen young, healthy participants, free from lower extremity injury walked on a split-belt treadmill with belts moving simultaneously at different speeds...
September 5, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28836890/hip-abductor-fatigability-and-recovery-are-related-to-the-development-of-low-back-pain-during-prolonged-standing
#17
Daniel Viggiani, Jack P Callaghan
A prolonged standing exposure can identify asymptomatic adults who have a higher risk of developing clinical low back pain later in life. Hip abductor cocontraction differences can predict low back pain development during standing exposures. This study's purpose was to determine if hip abductor strength, fatigability, and recovery during prolonged standing were related to standing-induced low back pain. Forty young, asymptomatic adults (50% female) performed two 2-hour standing sessions, a fatiguing hip abductor exercise was performed prior to one of the two standing sessions...
August 24, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28836882/erratum-lin-and-karduna-2017
#18
Casey Gentis
Come from the Glenohumeral Joint, "in J Appl Biomech. 33(1):32-38, https://doi.org/10.1123/jab.2016-0034 , Figure 3c was a duplicate of Figure 3b and was therefore incorrect. The online version of this article has been corrected; we apologize for this error.
August 24, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28836881/segmented-forefoot-plate-in-basketball-footwear-does-it-influence-performance-and-foot-joint-kinematics-and-kinetics
#19
Wing-Kai Lam, Winson Chiu-Chun Lee, Wei Min Lee, Christina Zong-Hao Ma, Pui Wah Kong
This study examined the effects of shoes' segmented forefoot stiffness on athletic performance and ankle and metatarsophalangeal joint kinematics and kinetics in basketball movements. Seventeen university basketball players performed running vertical jumps and 5-meter sprints at maximum effort with three basketball shoes of various forefoot plate conditions (medial plate, medial+lateral plates, and no-plate control). One-way repeated measures ANOVAs were used to examine the differences in athletic performance, joint kinematics, and joint kinetics among the three footwear conditions (ɑ = ...
August 24, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28787248/validation-of-an-inertial-sensor-system-for-physical-therapists-to-quantify-movement-coordination-during-functional-tasks
#20
Lindsey Tulipani, Mark G Boocock, Karen V Lomond, Mahmoud El-Gohary, Duncan A Reid, Sharon M Henry
Physical therapists evaluate patients' movement patterns during functional tasks; yet, their ability to interpret these observations consistently and accurately is unclear. Physical therapists would benefit from a clinic friendly method for accurately quantifying movement patterns during functional tasks. Inertial sensors, which are inexpensive, portable sensors capable of monitoring multiple body segments simultaneously, are a relatively new rehabilitation technology. We sought to validate an inertial sensor system by comparing lower limb and lumbar spine kinematic data collected simultaneously with a commercial inertial sensor system and a motion camera system while ten subjects performed functional tasks...
August 8, 2017: Journal of Applied Biomechanics
journal
journal
31473
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"