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 spatial map of the muscle activity for the right upper extremity during laterally directed submaximal force exertions. Electromyographic (EMG) activity was recorded from fourteen muscles surrounding the shoulder complex as the participants exerted 40N of force in two directions (leftward, rightward) at 70 defined locations. Hand position in both push directions strongly influenced total and certain individual muscle demands as identified by repeated measures analysis of variance (P < .001). During rightward exertions individual muscle activation varied from 1 to 21% MVE and during leftward exertions it varied from 1 to 27% MVE with hand location. Continuous prediction equations for muscular demands based on three-dimensional spatial parameters were created with explained variance ranging from 25 to 73%. The study provides novel information for evaluating existing and proactive workplace designs, and may help identify preferred geometric placements of lateral exertions in occupational settings to lower muscular demands, potentially mitigating fatigue and associated musculoskeletal risks.
journal_name
J Appl Biomechjournal_title
Journal of applied biomechanicsauthors
McDonald AC,Brenneman EC,Cudlip AC,Dickerson CRdoi
10.1123/jab.2012-0221subject
Has Abstractpub_date
2014-02-01 00:00:00pages
1-11issue
1eissn
1065-8483issn
1543-2688pii
2012-0221journal_volume
30pub_type
杂志文章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
doi:10.1123/jab.24.3.207
更新日期:2008-08-01 00:00:00
abstract::Parkinson's disease (PD) and aging lead to gait impairments. Some of the disturbances of gait are focused on step length, cadence, and temporal variability of gait cycle. Under experimental conditions gait can be overtly evaluated, but patients with PD are prone to expectancy effects; thus it seems relevant to determi...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2013-0319
更新日期:2015-06-01 00:00:00
abstract::In functional principal component analysis (fPCA) a threshold is chosen to define the number of retained principal components, which corresponds to the amount of preserved information. A variety of thresholds have been used in previous studies and the chosen threshold is often not evaluated. The aim of this study is t...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2013-0313
更新日期:2014-12-01 00:00:00
abstract::Although the lift force (F(L)) on a spinning baseball has been analyzed in previous studies, no study has analyzed such forces over a wide variety of spins. The purpose of this study was to describe the relationship between F(L) and spin for different types of pitches thrown by collegiate pitchers. Four high-speed vid...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2015-0068
更新日期:2016-04-01 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::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::Glide efficiency, the ability of a body to minimize deceleration over the glide, can change with variations in the body's size and shape. The purpose of this study was to investigate the relationships between glide efficiency and the size and shape characteristics of swimmers. Eight male and eight female swimmers perf...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.28.4.400
更新日期:2012-08-01 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::Anterior cruciate ligament (ACL) injury is one of the most common knee injuries among adolescent athletes. Majority of the ACL injuries occur due to pivoting, sudden deceleration, and direction change without contact with any player. Preventive interventions can reduce risks of the ACL injury, thus developing a clinic...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2018-0105
更新日期:2019-02-01 00:00:00
abstract::Virtual reality (VR) paradigms have proved to be a valid method to challenge and perturb balance. There is little consensus in the literature on the best protocol design to perturb balance and induce postural sway. Current VR interventions still lack a well-defined standardized metric to generate a virtual environment...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2019-0130
更新日期:2020-05-11 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 coupling between the residual limb and the lower-limb prosthesis is not rigid. As a result, external loading produces movement between the prosthesis and residual limb that can lead to undesirable soft-tissue shear stresses. As these stresses are difficult to measure, limb loading is commonly used as a surrogate. ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2019-0362
更新日期:2020-11-03 00:00:00
abstract::It has been suggested that noncontact anterior cruciate ligament injury commonly occurs during sports requiring acute deceleration or landing motion and that female athletes are more likely to sustain the injury than male athletes. The purpose of this study was to make task-to-task and male-female comparisons of knee ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.29.6.749
更新日期:2013-12-01 00:00:00
abstract::This study describes and contrasts the kinematics and kinetics of stair ambulation in people with chronic stroke and healthy control subjects. Three-dimensional motion data were collected from 10 persons with stroke (7 males) and 10 sex and age-matched older adults as they ascended and descended an instrumented stairc...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.29.4.443
更新日期:2013-08-01 00:00:00
abstract::The purpose of this study was to examine the interactions between aging, activity levels and maximal power production during cycling. Participants were divided into younger adults (YA), older active adults (OA,) and older sedentary adults (OS). Absolute maximum power was significantly greater in YA compared with OS an...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2013-0037
更新日期:2014-02-01 00:00:00
abstract::Our aim was to determine how skilled players regulate linear and angular impulse while maintaining balance during the golf swing. Eleven highly-skilled golf players performed swings with a 6-iron and driver. Components contributing to linear and angular impulse generated by the rear and target legs (resultant horizont...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2015-0131
更新日期:2016-08-01 00:00:00
abstract::Use of a shank shell has been shown to estimate tibial transverse rotations better than skin-mounted markers. However, the day-to-day reliability of the transverse tibial rotations using an individually molded shank shell has not been previously investigated. This study examined the between-tests and trials reliabilit...
journal_title:Journal of applied biomechanics
pub_type: 临床试验,杂志文章
doi:10.1123/jab.21.2.198
更新日期:2005-05-01 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::Altered scapular movement in subacromial pain syndrome has been demonstrated using discrete data reduction approach. However, this approach does not consider the data collinearity and variability, and scapular translations are poorly investigated in symptomatic individuals. The purpose of this study was to investigate...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2019-0247
更新日期:2020-02-25 00:00:00
abstract::This study aimed to examine the effects of knee position on the reliability and production of peak force (PF) and rate of force development (RFD) characteristics during an isometric squat. Fourteen resistance-trained females performed isometric squats at 90, 120, and 150° knee angles (corresponding to parallel, half, ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2017-0213
更新日期:2018-04-01 00:00:00
abstract::Examinations of bone density changes in selected knee bone ends were evaluated prospectively in a randomized group of 28 patients, aged from 41 to 65 (mean: 55.3 years), who had varus deformations of their mechanic limb axes, mean 8 degrees. The examinations were conducted during the preoperative period, 10 days, 3, 6...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章,随机对照试验
doi:10.1123/jab.28.4.359
更新日期:2012-08-01 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::This study aimed to develop insight into the lower extremity joint coupling motions used in the maximal velocity phase of sprint running. Two-dimensional coordinate data were used to derive sagittal plane joint angle profiles of sprint running trials. Intralimb joint coupling motions were examined using a continuous r...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.26.2.188
更新日期:2010-05-01 00:00:00
abstract::Given its apparent representation of cumulative (vs peak) loads, this feasibility study investigates vertical ground reaction impulse (vGRI) as a real-time biofeedback variable for gait training aimed at reducing lower limb loading. Fifteen uninjured participants (mean age = 27 y) completed 12 2-min trials, 1 at each ...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2017-0004
更新日期:2018-04-01 00:00:00
abstract::The purpose of this study was to indicate the effect of fatigue on the underwater right arm stroke motion during the 100-m front crawl. The arm stroke motions of eight male competitive swimmers were captured three-dimensionally at 60 Hz in the positions of 15 m and 65 m from the start. The hand velocity, the arm angul...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.24.4.316
更新日期:2008-11-01 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 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::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 v...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.23.1.79
更新日期:2007-02-01 00:00:00
abstract::The purpose of this study was to determine whether a lateral wedge insole reduces the external knee adduction moment during slope walking. Twenty young, healthy subjects participated in this study. Subjects walked up and down a slope using 2 different insoles: a control flat insole and a 7° lateral wedge insole. A thr...
journal_title:Journal of applied biomechanics
pub_type: 杂志文章
doi:10.1123/jab.2014-0247
更新日期:2015-12-01 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