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https://www.readbyqxmd.com/read/28227338/surface-electromyography-based-muscle-fatigue-analysis-for-stroke-patients-at-different-brunnstrom-stages
#1
Yinjun Tu, Zhe Zhang, Xudong Gu, Qiang Fang, Yinjun Tu, Zhe Zhang, Xudong Gu, Qiang Fang, Qiang Fang, Zhe Zhang, Yinjun Tu, Xudong Gu
Muscle fatigue analysis has been an important topic in sport and rehabilitation medicine due to its role in muscle performance evaluation and pathology investigation. This paper proposes a surface electromyography (sEMG) based muscle fatigue analysis approach which was specifically designed for stroke rehabilitation applications. 14 stroke patients from 5 different Brunnstrom recovery stage groups were involved in the experiment and features including median frequency and mean power frequency were extracted from the collected sEMG samples for investigation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227308/analyzing-the-influence-of-curl-speed-in-fatiguing-biceps-brachii-muscles-using-semg-signals-and-multifractal-detrended-moving-average-algorithm
#2
Kiran Marri, Ramakrishnan Swaminathan, Kiran Marri, Ramakrishnan Swaminathan, Kiuuwncran Marri, Ramakrishnan Swaminathan
In this work, an attempt has been made to analyze surface electromyography (sEMG) signals of fatiguing biceps brachii muscles at different curl speeds using multifractal detrended moving average (MFDMA) algorithm. For this purpose, signals are recorded from fifty eight healthy subjects while performing curl exercise at their comfortable speed until fatigue. The signals of first and last curls are considered as nonfatigue and fatigue conditions, respectively. Further, the number of curls performed by each subject and the endurance time is used for computing the normalized curl speed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28135584/athletic-background-is-related-to-superior-trunk-proprioceptive-ability-postural-control-and-neuromuscular-responses-to-sudden-perturbations
#3
Grace O Glofcheskie, Stephen H M Brown
Trunk motor control is essential for athletic performance, and inadequate trunk motor control has been linked to an increased risk of developing low back and lower limb injury in athletes. Research is limited in comparing relationships between trunk neuromuscular control, postural control, and trunk proprioception in athletes from different sporting backgrounds. To test for these relationships, collegiate level long distance runners and golfers, along with non-athletic controls were recruited. Trunk postural control was investigated using a seated balance task...
January 28, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28119156/chemosensory-anxiety-signals-prime-defensive-behavior-in-prepubertal-girls
#4
Katrin T Lübke, Anne Busch, Matthias Hoenen, Benoist Schaal, Bettina M Pause
Chemosensory anxiety signals effectively prime motor responses related to withdrawal behavior, such as the startle reflex, in adult humans. As the reproductive status strongly affects the response to social chemosignals, the current study examined whether chemosensory anxiety signals would augment the startle response in prepubertal children as it does in adults. Using cotton pads, axillary sweat was collected from 28 men while waiting for an important oral examination (anxiety condition), and during ergometer training (sport control condition)...
January 21, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/27821615/features-for-muscle-fatigue-computed-from-electromyogram-and-mechanomyogram-a-new-one
#5
Şükrü Okkesim, Kezban Coşkun
Muscle fatigue produces negative effects in the performance and it may lead to a muscle failure. This problem makes the quantitative grading of muscle fatigue a necessity in ergonomic and physiological research. Moreover, the quantitative grading of muscle fatigue is needed to increase work and sport productivity and prevent several accidents that result from muscle fatigue. Even though there are many studies for this aim, there is no quantitative criterion for the evaluation of muscle fatigue. The main reason is that muscle fatigue is a complex physiological situation that is dependent on several parameters...
November 7, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/27755353/predicting-the-functional-roles-of-knee-joint-muscles-from-internal-joint-moments
#6
Teresa E Flaxman, Tine Alkjær, Erik B Simonsen, Michael R Krogsgaard, Daniel L Benoit
INTRODUCTION: Knee muscles are commonly labeled as flexors or extensors and aptly stabilize the knee against sagittal plane loads. However, how these muscles stabilize the knee against adduction-abduction and rotational loads remains unclear. Our study sought 1) to classify muscle roles as they relate to joint stability by quantifying the relationship between individual muscle activation patterns and internal net joint moments in all three loading planes and 2) to determine whether these roles change with increasing force levels...
March 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27733087/comparison-of-muscle-activation-levels-between-healthy-individuals-and-persons-who-have-undergone-anterior-cruciate-ligament-reconstruction-during-different-phases-of-weight-bearing-exercises
#7
Gulcan Harput, Jennifer Sebert Howard, Carl Mattacola
Study Design Cross-sectional, controlled laboratory study. Background Quantification of muscular activation during different phases of functional activities is important to understand activation deficits in individuals who have undergone anterior cruciate ligament reconstruction (ACLR). Objectives To compare activation levels of the vastus medialis (VM), medial hamstrings (MH), and gluteus medius (GMed) muscles during the different phases of weight-bearing tasks between individuals who had undergone ACLR and healthy controls...
November 2016: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/27626836/muscle-activation-during-landing-before-and-after-fatigue-in-individuals-with-or-without-chronic-ankle-instability
#8
Kathryn A Webster, Brian G Pietrosimone, Phillip A Gribble
CONTEXT: Ankle instability is a common condition in physically active individuals. It often occurs during a jump landing or lateral motion, particularly when participants are fatigued. OBJECTIVE: To compare muscle activation during a lateral hop prefatigue and postfatigue in individuals with or without chronic ankle instability (CAI). DESIGN: Cross-sectional study. SETTING: Sports medicine research laboratory. PATIENTS OR OTHER PARTICIPANTS: A total of 32 physically active participants volunteered for the study...
August 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27625758/knee-muscular-control-during-jump-landing-in-multidirections
#9
Komsak Sinsurin, Roongtiwa Vachalathiti, Wattana Jalayondeja, Weerawat Limroongreungrat
BACKGROUND: Jump landing is a complex movement in sports. While competing and practicing, athletes frequently perform multi-planar jump landing. Anticipatory muscle activity could influence the amount of knee flexion and prepare the knee for dynamic weight bearing such as landing tasks. OBJECTIVES: The aim of the present study was to examine knee muscle function and knee flexion excursion as athletes naturally performed multi-direction jump landing. MATERIALS AND METHODS: Eighteen male athletes performed the jump-landing test in four directions: forward (0°), 30° diagonal, 60° diagonal, and lateral (90°)...
June 2016: Asian Journal of Sports Medicine
https://www.readbyqxmd.com/read/27532454/asymmetry-and-thigh-muscle-coactivity-in-fatigued-anterior-cruciate-ligament-reconstructed-elite-skiers
#10
Matthew J Jordan, Per Aagaard, Walter Herzog
PURPOSE: The acute effects of fatigue on functional interlimb asymmetry and quadriceps/hamstring muscle activity levels, including preparatory coactivation during squat jump takeoff and landing, were evaluated in elite alpine ski racers with/without anterior cruciate ligament reconstruction (ACLR). METHODS: Twenty-two elite ski racers (ACLR, n = 11; control, n = 11) performed an 80-s repeated squat jump test (jump test) on a dual force plate system with simultaneous EMG recordings in vastus lateralis, vastus medialis, semitendinosus, and biceps femoris...
January 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27525180/rehabilitation-of-subacromial-pain-syndrome-emphasizing-scapular-dyskinesis-in-amateur-athletes-a-case-series
#11
Katherinne F Moura, Renan L Monteiro, Paulo R G Lucareli, Thiago Y Fukuda
STUDY DESIGN: Case series. BACKGROUND AND PURPOSE: Scapular dyskinesis has been associated with several shoulder injuries. Recent literature has suggested that a greater activation of the scapular muscles can play an important role in reducing subacromial impingement in patients with shoulder pain. Thus, the purpose of this case series was to describe a rehabilitation program that emphasizes scapular dyskinesis correction for those with clinical evidence of subacromial pain syndrome...
August 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27468258/post-exercise-branched-chain-amino-acid-supplementation-does-not-affect-recovery-markers-following-three-consecutive-high-intensity-resistance-training-bouts-compared-to-carbohydrate-supplementation
#12
Wesley C Kephart, Petey W Mumford, Anna E McCloskey, A Maleah Holland, Joshua J Shake, C Brooks Mobley, Adam E Jagodinsky, Wendi H Weimar, Gretchen D Oliver, Kaelin C Young, Jordan R Moon, Michael D Roberts
BACKGROUND: Amino acid supplementation has been shown to potentially reduced exercise-induced muscle soreness. Thus, the purpose of this study was to examine if branched chain amino acid and carbohydrate (BCAACHO) versus carbohydrate-only sports drink (CHO) supplementation attenuated markers of muscle damage while preserving performance markers following 3 days of intense weight training. METHODS: Healthy resistance-trained males (n = 30) performed preliminary testing (T1) whereby they: 1) donated a baseline blood draw, 2) performed knee extensor dynamometry to obtain peak quadriceps isometric and isokinetic torque as well as electromyography (EMG) activity at 60°/s and 120°/s, and 3) performed a one repetition maximum (1RM) barbell back squat...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27457914/impact-of-inertial-training-on-strength-and-power-performance-in-young-active-men
#13
RANDOMIZED CONTROLLED TRIAL
Mariusz Naczk, Alicja Naczk, Wioletta Brzenczek-Owczarzak, Jarosław Arlet, Zdzisław Adach
Naczk, M, Naczk, A, Brzenczek-Owczarzak, W, Arlet, J, and Adach, Z. Impact of inertial training on strength and power performance in young active men. J Strength Cond Res 30(8): 2107-2113, 2016-This study evaluated how 5 weeks of inertial training using 2 different loads influenced strength and power performance. Fifty-eight male physical education students were randomly divided into training and control groups. The 2 training groups (T0 and T10) performed inertial training 3 times per week for 5 weeks using the new Inertial Training and Measurement System (ITMS)...
August 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27403454/comparison-of-muscle-onset-activation-sequences-between-a-golf-or-tennis-swing-and-common-training-exercises-using-surface-electromyography-a-pilot-study
#14
John M Vasudevan, Andrew Logan, Rebecca Shultz, Jeffrey J Koval, Eugene Y Roh, Michael Fredericson
Aim. The purpose of this pilot study is to use surface electromyography to determine an individual athlete's typical muscle onset activation sequence when performing a golf or tennis forward swing and to use the method to assess to what degree the sequence is reproduced with common conditioning exercises and a machine designed for this purpose. Methods. Data for 18 healthy male subjects were collected for 15 muscles of the trunk and lower extremities. Data were filtered and processed to determine the average onset of muscle activation for each motion...
2016: Journal of Sports Medicine (Hindawi Publishing Corporation)
https://www.readbyqxmd.com/read/27367574/running-related-gluteus-medius-function-in-health-and-injury-a-systematic-review-with-meta-analysis
#15
Adam Semciw, Racheal Neate, Tania Pizzari
Running is a popular sport and recreational physical activity worldwide. Musculoskeletal injuries in runners are common and may be attributed to the inability to control pelvic equilibrium in the coronal plane. This lack of pelvic control in the frontal plane can stem from dysfunction of the gluteus medius. The aim of this systematic review was therefore to: (i) compile evidence of the activity profile of gluteus medius when running; (ii) identify how gluteus medius activity (electromyography) varies with speed, cadence and gender when running; (iii) compare gluteus medius activity in injured runners to matched controls...
October 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27362657/are-sport-specific-profiles-of-tendon-stiffness-and-cross-sectional-area-determined-by-structural-or-functional-integrity
#16
Hans-Peter Wiesinger, Florian Rieder, Alexander Kösters, Erich Müller, Olivier R Seynnes
The present study aimed to determine whether distinct sets of tendon properties are seen in athletes engaged in sports with contrasting requirements for tendon function and structural integrity. Patellar and Achilles tendon morphology and force-deformation relation were measured by combining ultrasonography, electromyography and dynamometry in elite ski jumpers, distance runners, water polo players and sedentary individuals. Tendon cross-sectional area normalized to body mass2/3 was smaller in water polo players than in other athletes (patellar and Achilles tendon; -28 to -24%) or controls (patellar tendon only; -9%)...
2016: PloS One
https://www.readbyqxmd.com/read/27340037/analysis-of-concentric-and-eccentric-contractions-in-biceps-brachii-muscles-using-surface-electromyography-signals-and-multifractal-analysis
#17
Kiran Marri, Ramakrishnan Swaminathan
Muscle contractions can be categorized into isometric, isotonic (concentric and eccentric) and isokinetic contractions. The eccentric contractions are very effective for promoting muscle hypertrophy and produce larger forces when compared to the concentric or isometric contractions. Surface electromyography signals are widely used for analyzing muscle activities. These signals are nonstationary, nonlinear and exhibit self-similar multifractal behavior. The research on surface electromyography signals using multifractal analysis is not well established for concentric and eccentric contractions...
June 23, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/27239946/a-survey-of-sensor-devices-use-in-sports-biomechanics
#18
Róisín M Howard, Richard Conway, Andrew J Harrison
This paper examines the use of sensor devices in sports biomechanics, focusing on current frequency of use of Electromyography (EMG) device preferences. Researchers in the International Society of Biomechanics in Sports were invited to participate in an online survey. Responses on multiple sensor devices highlighting frequency of use, device features and improvements researchers sought in acquisition and analysis methods were obtained via an online questionnaire. Results of the investigation showed that the force platform is the most frequently used device, with inertial measurement units and EMG devices growing in popularity...
November 2016: Sports Biomechanics
https://www.readbyqxmd.com/read/27218465/functional-assessment-of-corticospinal-system-excitability-in-karate-athletes
#19
Fiorenzo Moscatelli, Giovanni Messina, Anna Valenzano, Vincenzo Monda, Andrea Viggiano, Antonietta Messina, Annamaria Petito, Antonio Ivano Triggiani, Michela Anna Pia Ciliberti, Marcellino Monda, Laura Capranica, Giuseppe Cibelli
OBJECTIVES: To investigate the involvement of the primary motor cortex (M1) in the coordination performance of karate athletes through transcranial magnetic stimulation (TMS). METHODS: Thirteen right-handed male karate athletes (25.0±5.0 years) and 13 matched non-athlete controls (26.7±6.2 years) were enrolled. A single-pulse TMS was applied using a figure-eight coil stimulator. Resting motor threshold (rMT) was determined. Surface electromyography was recorded from the first dorsal interosseous muscle...
2016: PloS One
https://www.readbyqxmd.com/read/27144837/does-muscular-force-of-the-upper-body-increase-following-acute-direct-vibration
#20
D J Cochrane
The aim of the current study was to examine the acute effect of direct vibration has on bicep curl force-generating capacity. 11 healthy team and individual sport-trained males performed right and left DB bicep curl at 50% of 1 RM where peak force (PF), mean force (MF), rate of force development (RFD) and electromyography (EMG) were assessed during the concentric phase before and immediately after direct vibration. Using new vibration technology utilizing a pulsing frequency (0-170 Hz) each arm was randomly assigned to receive either 10 min of direct vibration or control (no vibration)...
June 2016: International Journal of Sports Medicine
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