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Fatigue kinematics

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https://www.readbyqxmd.com/read/29153477/biomechanical-adaptations-during-running-differ-based-on-type-of-exercise-and-fitness-level
#1
Lindsay V Slater, Austin S Simpson, Silvia S Blemker, Jay Hertel, Susan A Saliba, Arthur L Weltman, Joseph M Hart
Lower extremity injuries are most common in more active and fit individuals, suggesting that adaptations from neuromuscular fatigue may differ depending on type of exercise and fitness level. The purpose of this study was to compare changes in gait in highly fit and recreationally active individuals before and after two exercise protocols. Lower extremity kinematics and kinetics were measured on the dominant leg during running before and after two exercise protocols (walking/sport) from 0 to 100% of gait in 24 healthy individuals divided into higher (n=13) and lower fitness (n=11) groups...
November 13, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29132791/in%C3%A2-vitro-kinematic-assessment-of-a-hinged-elbow-orthosis-following-lateral-collateral-ligament-injury
#2
Ranita H Manocha, Graham J W King, James A Johnson
PURPOSE: Elbow lateral collateral ligament injuries (LCLI) are often managed with protected mobilization using a hinged elbow orthosis (HEO). The objective of this investigation was to determine the effectiveness of an HEO in stabilizing the elbow following LCLI. METHODS: Seven fresh-frozen cadaveric upper extremity specimens were studied using a custom simulator that enabled elbow motion via computer-controlled actuators and servomotors attached to relevant tendons...
November 11, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29121490/inter-joint-coordination-changes-during-and-after-muscle-fatigue
#3
Jeffrey C Cowley, Deanna H Gates
People produce multi-joint movements by organizing many degrees of freedom into a few major covarying relationships, indicating a high level of inter-joint coordination. These relationships can be identified using data decomposition analyses (e.g. principal components analysis, non-negative matrix factorization). The purpose of this study was to determine how movement coordination changes during muscle fatigue by analyzing the covariance structure of multi-joint movements. Sixteen (16) healthy adults completed a continuous, timed ratcheting task with the right arm for three 1-min intervals before, during, and after an intermittent shoulder fatigue protocol...
November 6, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29116827/frontal-plane-variability-in-foot-orientation-during-fatiguing-running-exercise-in-individuals-with-chronic-ankle-instability
#4
Denise McGrath, Matthew Patterson, Ulrik McCarthy Persson, Brian Caulfield
CONTEXT:   Researchers have reported increased variability in frontal-plane movement at the ankle during jumping in individuals with chronic ankle instability (CAI), which may increase their risk of recurrent ankle sprain. It is not known if this behavior is present during running gait or how fatigue affects the amount of frontal-plane-movement variability in individuals with CAI. OBJECTIVE:   To investigate the amount of roll-angle variability at the foot during a fatiguing exercise protocol in participants with CAI...
November 8, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/29065622/effects-of-two-fatigue-protocols-on-impact-forces-and-lower-extremity-kinematics-during-drop-landings-implications-for-noncontact-anterior-cruciate-ligament-injury
#5
Rui Xia, Xini Zhang, Xi Wang, Xiaole Sun, Weijie Fu
The purpose of the study was to determine the effects of fatigue on the impact forces and sagittal plane kinematics of the lower extremities in a drop landing task. 15 male collegiate athletes were recruited. Five successful trials of a drop landing task were obtained during prefatigue and postfatigue in two fatigue protocols (constant speed running fatigue protocol [R-FP] and shuttle running + vertical jumping fatigue protocol [SV-FP]). Duration time, maximal heart rate, and RPE of each protocol were measured separately...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/28991732/feasibility-of-a-biomechanically-assistive-garment-to-reduce-low-back-loading-during-leaning-and-lifting
#6
Erik P Lamers, Aaron J Yang, Karl E Zelik
GOAL: The purpose of this study was: (i) to design and fabricate a biomechanically-assistive garment which was sufficiently lightweight and low-profile to be worn underneath, or as, clothing, and then (ii) to perform human subject testing to assess the ability of the garment to offload the low back muscles during leaning and lifting. METHODS: We designed a prototype garment which acts in parallel with the low back extensor muscles to reduce forces borne by the lumbar musculature...
October 9, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28975280/the-functional-roles-of-muscles-passive-prostheses-and-powered-prostheses-during-sloped-walking-in-people-with-a-transtibial-amputation
#7
Nathaniel T Pickle, Alena M Grabowski, Jana R Jeffers, Anne K Silverman
Sloped walking is challenging for individuals with transtibial amputation (TTA) due to the functional loss of the ankle plantarflexors. Prostheses that actively generate ankle power may help to restore this lost function. The purpose of this study was to use musculoskeletal modeling and simulation to quantify the mechanical power delivered to body segments by passive and powered prostheses and the remaining muscles in the amputated and intact legs during sloped walking. We generated walking simulations from experimental kinematic and kinetic data on slopes of 0, ±3 deg and ±6 deg in eight people with a TTA using powered and passive prostheses and eight nonamputees...
November 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28946538/effects-of-footrest-heights-on-muscle-fatigue-kinematics-and-kinetics-during-prolonged-standing-work
#8
Jae-Ik Son, Chung-Hwi Yi, Oh-Yun Kwon, Heon-Seock Cynn, One-Bin Lim, Yun-Jeong Baek, Ye-Ji Jung
BACKGROUND: Among the tools for relieving lower back pain, footrests are commonly recommended. Few studies have investigated the effects of footrest and the proper application of footrest height. OBJECTIVE: The purpose of this study was to compare the effects of the normalized footrest height on muscle fatigue, kinematics, kinetics, and pain intensity. METHODS: In total, 13 males who had a history of non-specific lower back pain during prolonged standing were recruited...
September 8, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28892460/fatigue-related-changes-in-technique-emerge-at-different-timescales-during-repetitive-training
#9
Daniel Aragonés, Alexander Eekhoff, Fabian Horst, Wolfgang Immanuel Schöllhorn
Training consisting of numerous repetitions performed as closely as possible to ideal techniques is common in sports and every-day tasks. Little is known about fatigue-related technique changes that emerge at different timescales when repeating complex actions such as a karate front kick. Accordingly, 15 karatekas performed 600 kicks (1 pre-block and 9 blocks). The pre-block comprised 6 kicks (3 with each leg) at maximum intensity (K-100%). Each block comprised 60 kicks (10 with each leg) at 80% of their self-perceived maximum intensity (K-80%) plus 6 K-100%...
September 11, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28837726/respiratory-and-laryngeal-changes-with-vocal-loading-in-younger-and-older-individuals
#10
Anusha Sundarrajan, Jessica E Huber, M Preeti Sivasankar
Purpose: The objective of the current study was to investigate the effects of age and vocal loading on the respiratory and laryngeal systems. Method: Fourteen younger (M = 20 years) and 13 older (M = 75 years) healthy individuals participated in a 40-min vocal loading challenge in the presence of 70-dB background noise. Respiratory kinematic and laryngeal measurements were obtained before and after the challenge. Results: Following the loading challenge, participants in both groups reported greater speaking effort...
September 18, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28820857/kinematic-and-neuromuscular-measures-of-intensity-during-plyometric-jumps
#11
David Cristóbal Andrade, Oscar Manzo, Ana Rosa Beltrán, Cristian Álvarez, Rodrigo Del Rio, Camilo Toledo, Jason Moran, Rodrigo Ramirez-Campillo
The aim of this study was to assess jumping performance and neuromuscular activity in lower limb muscles after drop jumps (DJ) from different drop heights (intensity) and during continuous jumping (fatigue), using markers such as reactive strength, jump height, mechanical power and surface electromyography (sEMG). The eccentric (EC) and concentric (CON) sEMG from the medial gastrocnemius (MG), biceps femoris (BF) and rectus (R) muscles were assessed during all tests. In a cross-sectional, randomized study, eleven volleyball players (age 24...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820647/acute-fatigue-negatively-affects-risk-factors-for-injury-in-trained-but-not-well-trained-habitually-shod-runners-when-running-barefoot
#12
Nicholas Tam, Devon R Coetzee, Safwaan Ahmed, Robert P Lamberts, Yumna Albertus-Kajee, Ross Tucker
INTRODUCTION: Many factors may contribute to running-related injury. These include fatigue and footwear, the combination of which has rarely been studied, in particular with reference to barefoot running, recently advocated as a method to reduce injury risk. METHODS: Twenty-two runners (12 well-trained and 10 trained) participated in a 10 km fatiguing trial. Knee and ankle joint kinematics and kinetics and electromyography were assessed during overground running in the barefoot and shod condition...
October 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28796125/electromyographic-and-kinematic-analysis-of-the-flexion-rotation-trunk-test
#13
María P García-Vaquero, Ignacio Ruiz-Pérez, David Barbado, Francisco J Vera-Garcia
While most trunk endurance field protocols are performed in the sagittal or frontal planes, the flexion-rotation trunk (FRT) test combines trunk flexion with rotation, which may be relevant to rotation-related sports. The aim of this study was to describe the trunk and hip muscle activation and fatigue and the range of hip flexion of this test. Twenty-seven physically active males and females performed the FRT test after a period of practice. Electromyographic (EMG) signals were bilaterally collected from the rectus abdominis (RA), internal oblique (IO), and rectus femoris (RF), and hip flexion amplitude was measured using a biaxial electrogoniometer...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28768338/combined-effects-of-fatigue-and-surface-instability-on-jump-biomechanics-in-elite-athletes
#14
Olaf Prieske, Marie Demps, Melanie Lesinski, Urs Granacher
The present study aimed to examine the effects of fatigue and surface instability on kinetic and kinematic jump performance measures. Ten female and 10 male elite volleyball players (18±2 years) performed repetitive vertical double-leg box jumps until failure. Pre and post fatigue, jump height/performance index, ground reaction force and knee flexion/valgus angles were assessed during drop and countermovement jumps on stable and unstable surfaces. Fatigue, surface condition, and sex resulted in significantly lower drop jump performance and ground reaction force (p≤0...
September 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28754606/prolonged-running-increases-knee-moments-in-sidestepping-and-cutting-manoeuvres-in-sport
#15
Robert J Savage, Brendan S Lay, Jodie A Wills, David G Lloyd, Tim L A Doyle
OBJECTIVES: To investigate how knee kinematics, kinetics and loading changes during sidestepping tasks following a prolonged running protocol performed in a laboratory setting. DESIGN: All participants performed sidestepping, and crossover cutting tasks in a randomised order before and after a 60min running protocol on a non-motorised treadmill that simulated an AF game. METHODS: Eight healthy male participants who partook in semi-professional and amateur Australian Football undertook a series of straight line runs, sidestepping (SS), and crossover cutting (XO) tasks before and after a simulated game of Australian football...
July 14, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28730917/novice-runners-show-greater-changes-in-kinematics-with-fatigue-compared-with-competitive-runners
#16
Ellen Maas, Jorien De Bie, Riet Vanfleteren, Wouter Hoogkamer, Benedicte Vanwanseele
Fatigue, developed over the course of a run, may cause changes in running kinematics. Training status may influence the effect of fatigue on running kinematics, since well trained, competitive runners are used to running until exhaustion, whereas novice runners are not. This study aimed to determine changes in running kinematics during an exhaustive run in both novice (NOVICE) and competitive (COMP) long-distance runners. About 15 NOVICE and 15 COMP runners performed a treadmill run, until voluntary exhaustion at 3,200 m time trial pace...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28702901/implications-of-impaired-endurance-performance-following-single-bouts-of-resistance-training-an-alternate-concurrent-training-perspective
#17
REVIEW
Kenji Doma, Glen B Deakin, David J Bentley
A single bout of resistance training induces residual fatigue, which may impair performance during subsequent endurance training if inadequate recovery is allowed. From a concurrent training standpoint, such carry-over effects of fatigue from a resistance training session may impair the quality of a subsequent endurance training session for several hours to days with inadequate recovery. The proposed mechanisms of this phenomenon include: (1) impaired neural recruitment patterns; (2) reduced movement efficiency due to alteration in kinematics during endurance exercise and increased energy expenditure; (3) increased muscle soreness; and (4) reduced muscle glycogen...
July 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28672127/local-dynamic-stability-of-the-spine-and-its-coordinated-lower-joints-during-repetitive-lifting-effects-of-fatigue-and-chronic-low-back-pain
#18
Naser Asgari, Mohammad Ali Sanjari, Ali Esteki
The nonlinear Lyapunov exponent (LyE) has been proven effective for evaluating the local stability of human movement and exploring the effects of load, speed and direction of individuals with and without nonspecific chronic low back pain (CLBP). The purpose of this study was to examine spinal and lower joint stability and response to fatigue of individuals with and without CLBP while performing lifting-lowering movements. Fourteen healthy individuals and 14 patients with nonspecific CLBP were recruited to perform lifting movement repeatedly while holding two equally-sized dumbbells in their hands...
August 2017: Human Movement Science
https://www.readbyqxmd.com/read/28650739/the-effect-of-high-intensity-exercise-and-anticipation-on-trunk-and-lower-limb-biomechanics-during-a-crossover-cutting-manoeuvre
#19
Enda F Whyte, Chris Richter, Siobhan O'connor, Kieran A Moran
We investigated the effects of high intensity, intermittent exercise (HIIP) and anticipation on trunk, pelvic and lower limb biomechanics during a crossover cutting manoeuvre. Twenty-eight male, varsity athletes performed crossover cutting manoeuvres in anticipated and unanticipated conditions pre- and post-HIIP. Kinematic and kinetic variables were captured using a motion analysis system. Statistical parametric mapping (repeated-measures ANOVA) was used to identify differences in biomechanical patterns. Results demonstrated that both unanticipation and fatigue (HIIP) altered the biomechanics of the crossover cutting manoeuvre, whereas no interactions effects were observed...
June 26, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28626309/does-the-weakening-of-intrinsic-foot-muscles-cause-the-decrease-of-medial-longitudinal-arch-height
#20
Kazunori Okamura, Shusaku Kanai, Sadaaki Oki, Satoshi Tanaka, Naohisa Hirata, Yoshiaki Sakamura, Norikatsu Idemoto, Hiroki Wada, Akira Otsuka
[Purpose] There are no reliable evidences that the weakening of intrinsic foot muscles causes the decrease of the medial longitudinal arch (MLA) height. The purpose of this study was to confirm whether the fatigue of intrinsic foot muscles decrease the MLA height during standing and gait using 3D motion analysis system. [Subjects and Methods] Twenty healthy male subjects participated in this study. Foot kinematics was measured using an Oxford Foot Model before and after fatigue-inducing exercises of the abductor hallucis and flexor hallucis brevis muscles...
June 2017: Journal of Physical Therapy Science
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