Abstract:
:Data piloting is important to ensure accurate marker coordinate data and to minimize camera dropout. Camera dropout results when a camera fails to image a marker, which often occurs when markers merge or become occluded. In this article, we present the conceptual framework for a numerical method of determining where video cameras, if placed, would have an occluded or a merged view of the tracking markers. Experimental data are presented to demonstrate the efficacy of the method as a tool to complement existing data piloting procedures.
journal_name
J Appl Biomechjournal_title
Journal of applied biomechanicsauthors
Manal K,Gardinier Jdoi
10.1123/jab.23.1.79subject
Has Abstractpub_date
2007-02-01 00:00:00pages
79-84issue
1eissn
1065-8483issn
1543-2688journal_volume
23pub_type
杂志文章abstract::In sweep-oar rowers, asymmetrical force production of the legs is a known phenomenon. The purpose of this study was to investigate the muscular activity of the legs that may cause this asymmetry even when oarsmen perform a symmetrical endurance task. Seven male young elite oarsmen performed an all-out 2000-m test on a...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.25.2.156
更新日期:2009-05-01 00:00:00
abstract::This study examined concurrent validity of countermovement vertical jump reactive strength index modified and force-time characteristics recorded using a 1-dimensional portable and laboratory force plate system. Twenty-eight men performed bilateral countermovement vertical jumps on 2 portable force plates placed on to...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2017-0371
更新日期:2018-10-01 00:00:00
abstract::Researchers conduct gait analyses utilizing both overground and treadmill modes of running. Previous studies comparing these modes analyzed discrete variables. Recently, techniques involving quantitative pattern analysis have assessed kinematic curve similarity in gait. Therefore, the purpose of this study was to comp...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.26.4.407
更新日期:2010-11-01 00:00:00
abstract::The objective of this study was to investigate the validity of power measurement techniques utilizing various kinematic and kinetic devices during the jump squat (JS), squat (S) and power clean (PC). Ten Division I male athletes were assessed for power output across various intensities: 0, 12, 27, 42, 56, 71, and 85% ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.23.2.103
更新日期:2007-05-01 00:00:00
abstract::We propose that learning proper hitting kinematics should be encouraged at a young age during youth baseball because this may help reinforce proper hitting kinematics as a player progresses to higher levels of baseball in their adult years. To enhance our understanding between youth and adult baseball hitting, kinemat...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.25.3.210
更新日期:2009-08-01 00:00:00
abstract::It is not known if a physically active lifestyle, without systematic training, is sufficient to combat age-related muscle and strength loss. Therefore, the purpose of this study was to evaluate if the maintenance of a physically active lifestyle prevents muscle impairments due to aging. To address this issue, we evalu...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.29.5.535
更新日期:2013-10-01 00:00:00
abstract::Our purpose was to characterize shoulder muscle volume and isometric moment, as well as their relationship, for healthy middle- aged adults. Muscle volume and maximum isometric joint moment were assessed for 6 functional muscle groups of the shoulder, elbow, and wrist in 10 middle-aged adults (46–60 y, 5M, 5F). ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2014-0177
更新日期:2015-12-01 00:00:00
abstract::Between-limb deficits in vertical ground reaction force (vGRF) production continue to remain years after anterior cruciate ligament rehabilitation, resulting in altered dynamic stability. However, the challenge is in identifying ways to assess this between-limb stability. This study implemented second-order autoregres...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2018-0414
更新日期:2019-10-18 00:00:00
abstract::In this paper, a literature review is presented regarding the hydrodynamic effects of different hand and arm movements during swimming with the aim to identify lacunae in current methods and knowledge, and to distil practical guidelines for coaches and swimmers seeking to increase swimming speed. Experimental and nume...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章,评审
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更新日期:2017-02-01 00:00:00
abstract::One potential ACL injury situation is due to contact with another person or object during the flight phase, thereby causing the person to land improperly. Conversely, athletes often have flight-phase collisions but do land safely. Therefore, to better understand ACL injury causation and methods by which people typical...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2013-0331
更新日期:2014-10-01 00:00:00
abstract::Isometric tasks have been a standard for electromyography (EMG) normalization stemming from anatomic and physiologic stability observed during contraction. Ballistic dynamic tasks have the benefit of eliciting maximum EMG signals for normalization, despite having the potential for greater signal variability. It is the...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2016-0146
更新日期:2017-07-01 00:00:00
abstract::As the modern workplace is dominated by submaximal repetitive tasks, knowledge of the effect of task location is important to ensure workers are unexposed to potentially injurious demands imposed by repetitive work in awkward or sustained postures. The purpose of this investigation was to develop a three-dimensional s...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2012-0221
更新日期:2014-02-01 00:00:00
abstract::The aim was to compare torque and rate of torque development of lower limb muscles between older women with functional and slow gait speeds to determine which muscle group is the best predictor of functional gait speed, and to establish strength thresholds needed for functional walking speed. Torque and rate of torque...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2016-0354
更新日期:2018-08-01 00:00:00
abstract::Elbow varus torque is a primary factor in the risk of elbow injury during pitching. To examine the effects of shoulder abduction and lateral trunk tilt angles on elbow varus torque, we conducted simulation and regression analyses on 33 college baseball pitchers. Motion data were used for computer simulations in which ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.22.2.93
更新日期:2006-05-01 00:00:00
abstract::The purpose of this study was to evaluate whether agonist muscle fatigue changed the coactivation time and the co-contraction magnitude of the agonist and antagonist muscle, and if the agonist muscle fatigue produced bias (constant error: CE) and inconsistency (variable error: VE) of the force. Subjects are 10 healthy...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.25.4.293
更新日期:2009-11-01 00:00:00
abstract::This study examined sex differences in head kinematics and neck muscle activity during sudden head perturbations. Sixteen competitive ice hockey players participated. Three muscles were monitored bilaterally using surface electromyography: sternocleidomastoid, scalene, and splenius capitis. Head and thorax kinematics ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2017-0268
更新日期:2018-11-21 00:00:00
abstract::The purpose of this study was to examine how wave-induced platform motion effects postural stability when handling loads. Twelve participants (9 male, 3 female) performed a sagittal lifting/lowering task with a 10 kg load in different sea conditions off the coast of Halifax, Nova Scotia, Canada. Trunk kinematics and f...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.28.2.111
更新日期:2012-05-01 00:00:00
abstract::The purpose of this study was to identify alterations in preparatory muscle activation patterns across different drop heights in female athletes. Sixteen female high school volleyball players performed the drop vertical jump from three different drop heights. Surface electromyography of the quadriceps and hamstrings w...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.27.3.215
更新日期:2011-08-01 00:00:00
abstract::Two optimization techniques, static optimization (SO) and computed muscle control (CMC), are often used in OpenSim to estimate the muscle activations and forces responsible for movement. Although differences between SO and CMC muscle function have been reported, the accuracy of each technique and the combined effect o...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2018-0332
更新日期:2020-07-14 00:00:00
abstract::For a physiologically realistic range of joint motion and therefore range of muscle fiber lengths, only part of the force-length curve can be used in vivo; i.e., the section of the force-length curve that is expressed can vary. The purpose of this study was to determine the expressed section of the force-length relati...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
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更新日期:2008-08-01 00:00:00
abstract::Less than 50% of athletes pass criteria to return to sports (RTS) 6 months after ACL reconstruction (ACLR). Using data on 38 noncopers, we hypothesized that preoperative age, quadriceps strength index (QI), and knee flexion moments (KFM) during gait would predict the ability to pass/fail RTS criteria and that preopera...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章,随机对照试验
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更新日期:2012-08-01 00:00:00
abstract::Inertial measurement units (IMU) provide a convenient tool for gait stability assessment. However, it is unclear how various gait characteristics relate to each other and whether gait characteristics can be obtained from resultant acceleration. Therefore, step duration variability was measured in treadmill walking fro...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
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更新日期:2016-08-01 00:00:00
abstract::Investigations of joint loading in knee osteoarthritis (OA) typically normalize the knee adduction moment to global measures of body size (eg, body mass, height) to allow comparison between individuals. However, such measurements may not reflect knee size. This study used a morphometric measurement of the cartilage su...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2014-0249
更新日期:2015-12-01 00:00:00
abstract::This study aimed to determine whether subject-specific individual muscle models for the ankle plantar flexors could be obtained from single joint isometric and isovelocity maximum torque measurements in combination with a model of plantar flexion. Maximum plantar flexion torque measurements were taken on one subject a...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.28.6.751
更新日期:2012-12-01 00:00:00
abstract::This study aimed to investigate the effects of varying midsole hardness on center of pressure (COP) and perceived stability during basketball-specific tasks, as well as the correlation between COP and perception measurements. A total of 20 male basketball players performed 45° cutting and layup while wearing basketbal...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2017-0120
更新日期:2018-08-01 00:00:00
abstract::This study examined lower extremity joint moments during walk and turn with different turn angles and pivot feet. Seven young adults (age 21+/-1.3 yrs) were asked to walk at a self-selected speed (1.35+/-0.15 m/s) and to turn to the right using right (spin turn) and left (step turn) pivot feet at turn angles of 0 degr...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.22.1.74
更新日期:2006-02-01 00:00:00
abstract::The aim of this systematic review was to evaluate the impact of bilaterally symmetrical backpack systems borne on the posterior trunk on walking biomechanics, as backpacks represent the most prevalent method of load carriage in the military and civilian population. A search of electronic databases was performed for st...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章,meta分析,评审
doi:10.1123/jab.2015-0339
更新日期:2016-12-01 00:00:00
abstract::We have developed a 2-D analytical biomechanical model for monoarticular open kinetic-chain exercises with lever selectorized equipment, and different relative placement between the joint center of rotation (J) and the center of rotation (C) of the resistance input lever ("off-center" exercises). All the relevant geom...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.26.1.73
更新日期:2010-02-01 00:00:00
abstract::Proper scapular motion is crucial for normal shoulder mechanics. Scapular motion affects glenohumeral joint function during throwing, yet little is known about this dynamic activity. Asymptomatic subjects (10 male and 10 female), ages 21 to 45, were analyzed. Electromagnetic surface sensors on the sternum, acromion, a...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.24.1.24
更新日期:2008-02-01 00:00:00
abstract::The segment principal moments of inertia of a sample of 7 elderly males and 12 elderly females were estimated using a model based on stacked elliptical cylinders at 2-cm intervals. Apart from the thigh, all male parameters were larger than female parameters. The largest differences were for the lower trunk and hand an...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.9.4.287
更新日期:1993-11-01 00:00:00