keyword
MENU ▼
Read by QxMD icon Read
search

Fatigue kinematics

keyword
https://www.readbyqxmd.com/read/29337832/comparison-of-step-by-step-kinematics-in-repeated-30m-sprints-in-female-soccer-players
#1
Roland van den Tillaar
The aim of this study was to compare kinematics in repeated 30m sprints in female soccer players. Seventeen subjects performed seven 30m sprints every 30s in one session. Kinematics were measured with an infrared contact mat and laser gun, and running times with an electronic timing device. The main findings were that sprint times increased in the repeated sprint ability test. The main changes in kinematics during the repeated sprint ability test were increased contact time and decreased step frequency, while no change in step length was observed...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29334274/an-overview-of-robotic-mechanical-devices-for-post-stroke-thumb-rehabilitation
#2
Marian Suarez-Escobar, Elizabeth Rendon-Velez
PURPOSE: This article aims to clarify the current state-of-the-art of robotic/mechanical devices for post-stroke thumb rehabilitation as well as the anatomical characteristics and motions of the thumb that are crucial for the development of any device that aims to support its motion. METHODS: A systematic literature search was conducted to identify robotic/mechanical devices for post-stroke thumb rehabilitation. Specific electronic databases and well-defined search terms and inclusion/exclusion criteria were used for such purpose...
January 15, 2018: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/29249454/biomechanical-consequences-of-running-with-deep-core-muscle-weakness
#3
Margaret E Raabe, Ajit M W Chaudhari
The deep core muscles are often neglected or improperly trained in athletes. Improper function of this musculature may lead to abnormal spinal loading, muscle strain, or injury to spinal structures, all of which have been associated with increased low back pain (LBP) risk. The purpose of this study was to identify potential strategies used to compensate for weakness of the deep core musculature during running and to identify accompanying changes in compressive and shear spinal loads. Kinematically-driven simulations of overground running were created for eight healthy young adults in OpenSim at increasing levels of deep core muscle weakness...
December 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29238254/assessment-of-three-dimensional-trunk-kinematics-and-muscle-activation-during-cycling-with-independent-cranks
#4
Eric Bourdon, Matthew Mavor, Dean C Hay
Independent cranks (IC) are recently introduced bicycle cranks that are decoupled; therefore allowing each leg to pedal independent of the other. Despite this introduction, limited research has been conducted assessing biomechanical changes when cycling with IC. Therefore, the purpose of this study was to evaluate and compare trunk kinematics and surface electromyography (sEMG) during IC and normal crank (NC) cycling during a graded exercise test to volitional fatigue. Ten healthy, physically active men performed two tests (IC and NC) on a cycling ergometer on separate days...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29233238/neck-kinematics-and-electromyography-while-wearing-head-supported-mass-during-running
#5
Matthew M Hanks, JoEllen M Sefton, Gretchen D Oliver
BACKGROUND: Advanced combat helmets (ACH) coupled with night-vision goggles (NVG) are required for tactical athletes during training and service. Head and neck injuries due to head supported mass (HSM) are a common occurrence in military personnel. The current study aimed to investigate the effects of HSM on neck muscle fatigue that may lead to chronic stress and injury of the head and neck. METHODS: Subjects wore an ACH and were affixed with electromagnetic sensors to obtain kinematic data, as well as EMG electrodes to obtain muscle activations of bilateral sternocleidomastoid, upper trapezius, and paraspinal muscles while running on a treadmill...
January 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29218309/kinematic-changes-during-prolonged-fast-walking-in-old-and-young-adults
#6
Camila Fonseca Oliveira, Edgar Ramos Vieira, Filipa Manuel Machado Sousa, João Paulo Vilas-Boas
Walking biomechanics is known to be influenced by speed. However, most of the research examining the effects of walking speed and gait characteristics has been conducted after a fast-walking task, neglecting the changes that may occur during the task. The aim of the present study was to determine the impact of fast-walking over time on kinematics in young and old adults. Twenty-seven young adults (26.6 ± 6.0 years) and 23 old adults (71.0 ± 5.6 years) walked at 70% of their maximum heart rate for 20 min or until exhaustion, and the effects of fast-walking on temporospatial parameters and on angular kinematics were analyzed during the activity...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29191076/customized-surface-guided-knee-implant-contact-analysis-and-experimental-test
#7
Ida Khosravipour, Shabnam Pejhan, Yunhua Luo, Urs P Wyss
Contact pressure and stresses on the articulating surface of the tibial component of a total knee replacement are directly related to the joint contact forces and the contact area. These stresses can result in wear and fatigue damage of the ultra-high-molecular-weight polyethylene. Therefore, conducting stress analysis on a newly designed surface-guided knee implant is necessary to evaluate the design with respect to the polyethylene wear. Finite element modeling is used to analyze the design's performance in level walking, stair ascending and squatting...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29153477/biomechanical-adaptations-during-running-differ-based-on-type-of-exercise-and-fitness-level
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
keyword
keyword
40855
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"