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Fatigue kinematics

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https://www.readbyqxmd.com/read/27909885/kinematics-and-muscle-activation-patterns-during-a-maximal-voluntary-rate-activity-in-healthy-elderly-and-young-adults
#1
Eva Chadnova, Nancy St-Onge, Richard Courtemanche, Robert D Kilgour
BACKGROUND: Maximal voluntary rate (MVR) performance tasks can provide important age-related information to the limiting factors associated with movement and the development of fatigue. AIM: To determine whether kinematic and muscle activation patterns during an MVR task differ between young and older adults. METHODS: We continuously measured frequency, amplitude, peak velocity, index of co-contraction and median frequencies of the index finger flexors and extensors during a 20-s MVR task in 10 young and 10 older subjects...
December 1, 2016: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/27895569/influence-of-lumbar-muscle-fatigue-on-trunk-adaptations-during-sudden-external-perturbations
#2
Jacques Abboud, François Nougarou, Arnaud Lardon, Claude Dugas, Martin Descarreaux
Introduction: When the spine is subjected to perturbations, neuromuscular responses such as reflex muscle contractions contribute to the overall balance control and spinal stabilization mechanisms. These responses are influenced by muscle fatigue, which has been shown to trigger changes in muscle recruitment patterns. Neuromuscular adaptations, e.g., attenuation of reflex activation and/or postural oscillations following repeated unexpected external perturbations, have also been described. However, the characterization of these adaptations still remains unclear...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27877137/an-extreme-mountain-ultra-marathon-decreases-the-cost-of-uphill-walking-and-running
#3
Gianluca Vernillo, Aldo Savoldelli, Spyros Skafidas, Andrea Zignoli, Antonio La Torre, Barbara Pellegrini, Guido Giardini, Pietro Trabucchi, Grégoire P Millet, Federico Schena
Purpose: To examine the effects of the world's most challenging mountain ultramarathon (MUM, 330 km, cumulative elevation gain of +24,000 m) on the energy cost and kinematics of different uphill gaits. Methods: Before (PRE) and immediately after (POST) the competition, 19 male athletes performed three submaximal 5-min treadmill exercise trials in a randomized order: walking at 5 km·h(-1), +20%; running at 6 km·h(-1), +15%; and running at 8 km·h(-1), +10%. During the three trials, energy cost was assessed using an indirect calorimetry system and spatiotemporal gait parameters were acquired with a floor-level high-density photoelectric cells system...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27865130/effects-of-fatigue-on-lower-limb-pelvis-and-trunk-kinematics-and-muscle-activation-gender-differences
#4
Giovanna Camparis Lessi, Ana Flávia Dos Santos, Luis Fylipe Batista, Gabriela Clemente de Oliveira, Fábio Viadanna Serrão
BACKGROUND: Muscle fatigue is associated with biomechanical changes that may lead to anterior cruciate ligament (ACL) injuries. Alterations in trunk and pelvis kinematics may also be involved in ACL injury. Although some studies have compared the effects of muscle fatigue on lower limb kinematics between men and women, little is known about its effects on pelvis and trunk kinematics. The aim of the study was to compare the effects of fatigue on lower limb, pelvis and trunk kinematics and muscle activation between men and women during landing...
November 9, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27846435/muscle-activation-patterns-of-the-lumbo-pelvic-hip-complex-during-walking-gait-before-and-after-exercise
#5
Mihyang Chang, Lindsay V Slater, Revay O Corbett, Joseph M Hart, Jay Hertel
The lumbo-pelvic-hip core complex consists of musculoskeletal structures that stabilize the spine and pelvis, however fatigue may affect muscle recruitment, active muscle stiffness and trunk kinematics, compromising trunk stability. The purpose of this study was to compare trunk muscle activation patterns, and trunk and lower extremity kinematics during walking gait before and after exercise. Surface electrodes were placed over the rectus abdominis, external oblique, erector spinae, gluteus medius, vastus lateralis, and vastus medialis of twenty-five healthy inidviduals...
November 9, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27834558/comprehensive-gait-analysis-of-healthy-older-adults-who-have-undergone-long-distance-walking
#6
Mustafa M O Elhadi, Christina Z Ma, Duo W C Wong, Anson H P Wan, Winson C C Lee
Many older adults do not adhere to the recommended physical activity levels. This study examines the gait changes upon long-distance walking among healthy older adults. Gait tests of 24 adults aged 65 or more were conducted at the baseline, at the end of 30 and 60 minutes of treadmill walk. Spatial temporal, kinematic and kinetic gait data were computed. Perceived level of exertion was evaluated for each subject. Ten subjects (Group B) perceived higher exertion level than the remaining fourteen subjects (Group A)...
November 11, 2016: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/27821310/differences-in-motor-variability-among-individuals-performing-a-standardized-short-cycle-manual-task
#7
Jonas Sandlund, Divya Srinivasan, Marina Heiden, Svend Erik Mathiassen
Motor variability (MV) has been suggested to be a determinant of the risk for developing musculoskeletal disorders in repetitive work. In this study we examined whether individuals consistently differed in the extent of motor variability when performing a standardized short-cycle manual task. On three separate days, arm kinematics was recorded in 14 healthy subjects performing a pipetting task, transferring liquid from a pick-up tube to eight target tubes with a cycle time of 2.8s. Cycle-to-cycle standard deviations (SD) of a large selection of shoulder and elbow kinematic variables, were processed using principal component analysis (PCA)...
November 4, 2016: Human Movement Science
https://www.readbyqxmd.com/read/27733665/effects-of-a-three-set-tennis-match-on-knee-kinematics-and-leg-muscle-activation-during-the-tennis-serve
#8
Brad Fenter, Thomas S Marzilli, Yong T Wang, Xuanliang N Dong
The purpose of this study was to determine the effect of a three-set tennis match on knee kinematics and leg muscle activation during the tennis serve in a real-time environment. Motion capture data and wireless electromyography of hamstrings and quadriceps muscles were collected from the back leg during the serve. A reduction of maximum knee flexion angle and a decrease of electromyography amplitudes in leg muscles were observed during the match. However, the knee angular velocity and the electromyography frequency of leg muscles remain unchanged throughout the match...
October 12, 2016: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/27718393/the-effects-of-fatigue-on-lower-extremity-kinematics-kinetics-and-joint-coupling-in-symptomatic-female-runners-with-iliotibial-band-syndrome
#9
Allison M Brown, Rebecca A Zifchock, Howard J Hillstrom, Jinsup Song, Carole A Tucker
BACKGROUND: Altered hip and knee kinematics and joint coupling have been documented in runners with iliotibial band syndrome. Symptoms often present themselves after several minutes of running, yet the effect of fatigue warrants further exploration. The purpose of this study was to determine the effect of a run to fatigue in runners with iliotibial band syndrome, as compared to healthy controls. METHODS: Twenty uninjured and 12 female runners with iliotibial band syndrome performed a treadmill run to fatigue...
September 30, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27697468/muscle-fatigue-effects-can-be-anticipated-to-reproduce-a-movement-kinematics-learned-without-fatigue
#10
Florian Monjo, Nicolas Forestier
Muscle fatigue modifies the gain between motor command magnitude and the mechanical muscular response. In other words, post-fatigue, central drives to the muscles must increase to maintain a particular submaximum mechanical output. In this study, we tested the hypothesis that this modified gain can be predicted by the central nervous system (CNS) during discrete ballistic movements. In two separate experiments, subjects were required to perform shoulder flexions in standing and sitting positions at submaximum target peak accelerations...
December 17, 2016: Neuroscience
https://www.readbyqxmd.com/read/27692798/biomechanical-responses-to-changes-in-friction-on-a-clay-court-surface
#11
Chelsea Starbuck, Victoria Stiles, Daniel Urà, Matt Carré, Sharon Dixon
OBJECTIVES: To examine the influence of clay court frictional properties on tennis players' biomechanical response. DESIGN: Repeated measures. METHODS: Lower limb kinematic and force data were collected on sixteen university tennis players during 10×180° turns (running approach speed 3.9±0.20ms(-1)) on a synthetic clay surface of varying friction levels. To adjust friction levels the volume of sand infill above the force plate was altered (kg per m(2) surface area; 12, 16 and 20kgm(-2))...
September 1, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27686166/acute-effects-of-high-intensity-intermittent-training-on-kinematics-and-foot-strike-patterns-in-endurance-runners
#12
P Á Latorre-Román, F García Pinillos, P Bujalance-Moreno, V M Soto-Hermoso
The main purpose of this study was to evaluate running kinematic characteristics and foot strike patterns (FSP) during early and late stages of actual and common high-intensity intermittent training (HIIT): 5 × 2000 m with 120-s recovery between runs. Thirteen healthy, elite, highly trained male endurance runners participated in this study. They each had a personal record in the half-marathon of 70 ± 2.24 min, and each had a minimum experience of 4 years of training and competition. Heart rate (HR) and rate of perceived exertion (RPE) were monitored during HIIT...
August 11, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27676881/brace-kinematical-analysis-on-patients-with-camptocormia
#13
Ricardo Duarte, Michel Mesnard, Philippe Wentzy, Mathieu De Sèze
OBJECTIVE: Camptocormia is a postural disease characterized by the trunk's antero-flexion during the walking gait. A brace to correct the posture is usually proposed. The evaluation of its effect through static measures has proved to be insufficient. The brace effectiveness was never evaluated on the kinematics point of view. According to that, the purpose of this study was to evaluate cinematically the evolution of the cervical arrow during the walking gait in patients with camptocormia...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27633348/evaluating-the-relationship-between-muscle-activation-and-spine-kinematics-through-wavelet-coherence
#14
Dean C Hay, Mark P Wachowiak, Ryan B Graham
Advances in time-frequency analysis can provide new insights into the important, yet complex relationship between muscle activation (ie, electromyography [EMG]) and motion during dynamic tasks. We use wavelet coherence to compare a fundamental cyclical movement (lumbar spine flexion and extension) to the surface EMG linear envelope of 2 trunk muscles (lumbar erector spinae and internal oblique). Both muscles cohere to the spine kinematics at the main cyclic frequency, but lumbar erector spinae exhibits significantly greater coherence than internal oblique to kinematics at 0...
October 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27632838/effects-of-volitional-spine-stabilization-and-lower-extremity-fatigue-on-knee-and-ankle-during-landing-performance-in-a-recurrent-low-back-pain-population
#15
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
https://www.readbyqxmd.com/read/27584512/lower-extremity-kinematic-and-emg-activity-changes-with-fatigue-during-an-agility-test-3366-board-8-june-3-3-15-pm-5-15-pm
#16
Ernest Eusebio, Christopher Rago, Thomas Martin, Karen Myrick, David Wallace, Richard Feinn, Ryan Spencer, Juan C Garbalosa
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27584412/measuring-fatigue-induced-changes-in-3d-trunk-kinematics-measured-by-inertial-magnetic-measurement-units-2286-board-4-june-2-3-15-pm-5-15-pm
#17
Jasper Reenalda, Erik Maartens
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27584334/effects-of-gluteal-fatigue-on-shoulder-and-scapula-kinematics-among-ncaa-division-i-softball-athletes-1295-board-7-june-2-8-00-am-10-00-am
#18
Sarah S Gascon, Jessica K Washington, Jence A Rhoads, Keith R Lohse, Gretchen D Oliver
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27584330/measuring-fatigue-induced-changes-on-kinematic-and-electromyography-measurements-during-long-distance-road-cycling-1291-board-3-june-2-8-00-am-10-00-am
#19
Carmen van den Hoven, Rianne Huis In 't Veld, Erik Maartens, Anko Boelens, Jasper Reenalda
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27584328/the-effects-of-trunk-fatigue-on-proximal-joint-kinematics-and-coupling-during-running-1289-board-1-june-2-8-00-am-10-00-am
#20
Paul W Kline, Kristin D Morgan, Katie Grim, Katelyn Ackerman, Brian Noehren
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
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