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Journal of Electromyography and Kinesiology

Masayuki Yokoyama, Masao Yanagisawa
Intrinsic hand muscles are densely located in the hand, and the myoelectric observation from the surface is sometimes unreliable because of some outside influences that may interfere with the signals. In the present study, we evaluated the activities of multiple interosseous hand-muscles which densely located in the hand, through analyzing the surface electromyographic signals during finger-oriented tasks using univariate and multivariate logistic regression models. Ten healthy subjects participated in our experiment, and isometrically exercised each finger one by one in flexed form...
December 23, 2018: Journal of Electromyography and Kinesiology
Talia Alenabi, Rachel L Whittaker, Soo Y Kim, Clark R Dickerson
This study aimed to evaluate the effect of arm posture on activation of the anterior and posterior regions of supraspinatus and the superior and middle regions of infraspinatus during resisted isometric arm elevations. Thirty-one healthy participants performed 18 isometric resistance exertions against a force cube in three elevation planes (flexion, scaption, abduction) and three elevation angles (30°, 90°, 150°) in maximal and sub-maximal resistance conditions. EMG data were obtained using four pairs of fine wire electrodes...
December 15, 2018: Journal of Electromyography and Kinesiology
G Montgomery, G Abt, C Dobson, T Smith, W Evans, M Ditroilo
High impact exercise can reduce postmenopausal bone loss, however stimulus frequency (loading cycles per second) can affect osteogenesis. We aimed to examine the effect of stimulus frequency on the mechanical loading of four common osteoporosis prevention exercises, measuring body acceleration and muscle activation with accelerometry and electromyography (EMG), respectively. Fourteen early postmenopausal women completed randomised countermovement jumps (CMJ), box-drops (BD), heel-drops (HD) and stamp (STP) exercises for continuous and intermittent stimulus frequencies...
December 11, 2018: Journal of Electromyography and Kinesiology
Sidney Grosprêtre, Philippe Gimenez, Laurent Mourot, Giuseppe Coratella
This study investigated the neuromuscular fatigue following an elastic band exercise (EB) of the plantar flexors, compared to an intermittent phasic isometric exercise (ISO). Eleven young healthy males (age: 24.2 ± 3.7) took part in the study, consisting of one experimental session involving two 5-min fatiguing protocols separated by 20 min rest and performed randomly. Both exercises were performed at maximal motor output of the plantar flexor muscles, EMG being used as a feedback signal. Neuromuscular fatigue was assessed through changes in maximal voluntary contraction (MVC) and in evoked responses of soleus and gastrocnemii muscles to posterior tibial nerve stimulation (H-reflex, M-wave, V-wave)...
December 11, 2018: Journal of Electromyography and Kinesiology
Danny M Pincivero, Rachael R Polen, Brittany N Byrd
INTRODUCTION: Agonist muscle contraction mode and intensity effects on antagonist co-activation was examined between men and women. METHODS: Fifteen healthy young men (mean ± standard deviation age = 24.9 ± 4.2 years, body mass index = 23.17 ± 2.34) and 15 women (mean ± standard deviation age = 21.8 ± 2.3 years, body mass index = 24.16 ± 2.91) performed five isokinetic concentric and eccentric maximal-effort elbow flexor/extensor contractions to establish their peak torque...
December 8, 2018: Journal of Electromyography and Kinesiology
Veronica Cimolin, Nicola Cau, Giovanna Malchiodi Albedi, Valentina Aspesi, Vanessa Merenda, Manuela Galli, Paolo Capodaglio
The purpose of this study was to validate Time Up and Go test (TUG) as measured by a single Inertial Measurement Unit (IMU) placed on the lower back to that measured by a stopwatch in obese and normal weight women; in addition, the comparison of the performance of TUG test between obese and healthy women using the instrumented TUG (iTUG). Forty-four severely obese women and 14 age-matched healthy women were assessed simultaneously by IMU and stopwatch. The comparison between manual and instrumented assessment of total time duration showed no significant differences both in the healthy (8...
December 5, 2018: Journal of Electromyography and Kinesiology
A Ventura, B Muendle, B Friesenbichler, N C Casartelli, I Kramers, N A Maffiuletti
Aim of this study was to investigate if knee extensor maximal voluntary contraction (MVC) torque and rate of torque development (RTD) deficits are accompanied by neuromuscular activation failure in patients with knee osteoarthritis (KOA). Nineteen patients with unilateral KOA completed gradual MVCs, from which MVC torque, voluntary activation and maximal EMG activity were recorded, and explosive MVCs, from which RTD and rate of EMG rise were recorded. For gradual MVCs, MVC torque (-28%), voluntary activation (-6%) and maximal EMG activity (-30%) were lower on the involved than on the uninvolved side (p < 0...
December 4, 2018: Journal of Electromyography and Kinesiology
Tyler D Chuang, Stacey M Acker
There is no consensus on the most appropriate method for normalizing an individual's electromyography (EMG) signals from walking, cycling and running in the same data collection. The aim of this study was to compare how the magnitude and repeatability of normalization values differ from three normalization methods and to compare their scaling effect in three moderate intensity activities. Three rounds of maximal voluntary isometric contractions (MVICs), sprint cycling and sprint running were performed to obtain normalization values for each method...
December 1, 2018: Journal of Electromyography and Kinesiology
Christoph Anders, Steffen Patenge, Klaus Sander, Frank Layher, Raimund W Kinne
Guteal muscle activation during walkway and treadmill walking was compared by means of Surface EMG (SEMG). Healthy older adults (50-75 years, n = 54; 29 females, 25 males) walked on a walkway (WW) at their self-selected slow, normal, and fast walking speeds and on a treadmill (TM) at 2, 3, 4, 5, and 6 km/h. Subject-individual, best-matched speed pairs were constituted and named SLOW, NORMAL, and FAST. Hip muscle activation was measured on both sides at mid-distance between the greater trochanter and the iliac crest by applying eight equally-spaced bipolar SEMG channels from ventral to dorsal (P1-P8)...
November 29, 2018: Journal of Electromyography and Kinesiology
K Kryściak, J Celichowski, P Krutki, R Raikova, H Drzymała-Celichowska
The sag phenomenon can be observed in fast motor units (MUs) as a transitional decline in force during unfused tetanic contractions; however, its mechanisms are poorly understood. The study aimed to identify in the rat muscle factors that contribute to sag in two types of fast MUs: fast fatigable (FF) and fast resistant to fatigue (FR). First, we performed mathematical decomposition of sagging tetanic contractions of FF and FR MUs into twitch-like responses to consecutive stimuli. This process indicated an increase in the amplitudes of a few initial responses (up to the 2nd-3rd for FF and up to the 2nd-7th for FR MUs), followed by a decrease in the amplitudes of later responses...
November 28, 2018: Journal of Electromyography and Kinesiology
Ryosuke Ando, Shohei Kondo, Keisho Katayama, Koji Ishida, Hiroshi Akima
We aimed to test the hypothesis that the magnitude of differences in muscle activation of the knee and hip extensor muscles between high-intensity interval exercise (HIE) and moderate-intensity constant exercise (CE) would be greater for the gluteus maximus than for the quadriceps femoris muscle. Participants were 11 male middle- or long-distance runners. The HIE (4 sets, 4-min induration, performed at 80-85%VO2peak and followed by a 3-min period of cycling at < 30%VO2peak ) and CE (28-min, performed at or near 60%VO2peak ) were completed on different days, with the total exercise duration and work being identical for both protocols...
November 28, 2018: Journal of Electromyography and Kinesiology
Vanessa S Pereira-Baldon, Mariana Arias Avila, Carolina Bertholdo Dalarmi, Ana Beatriz de Oliveira, Patricia Driusso
BACKGROUND: Physical therapy is recommended as first-line treatment to urinary incontinence (UI), and pelvic floor muscles (PFM) training is one of the most used resources for this purpose, no ideal PFM training protocol has been established. OBJECTIVES: The purpose of the present study was to verify whether more daily sessions of PFM training lead to better PFM function. METHODS: Twenty-five young continent women volunteered and were randomly assigned to 2 different groups; group 1, in which they performed one PFM training session daily, and group 2, in which they performed 3 daily PFM training sessions...
November 20, 2018: Journal of Electromyography and Kinesiology
Kim Hébert-Losier, Ngieng Siew Yin, C Martyn Beaven, Chris Chow Li Tee, Jim Richards
Kinesiology-type tape (KTT) has become popular in sports for injury prevention, rehabilitation, and performance enhancement. Many cyclists use patella KTT; however, its benefits remain unclear, especially in uninjured elite cyclists. We used an integrated approach to investigate acute physiological, kinematic, and electromyographic responses to patella KTT in twelve national-level male cyclists. Cyclists completed four, 4-minute submaximal efforts on an ergometer at 100 and 200 W with and without patella KTT...
November 19, 2018: Journal of Electromyography and Kinesiology
Aoi Matsumura, Atsushi Ueda, Yasuo Nakamura
The conventional acromion marker cluster (AMC) method used to estimate scapular orientation cannot adequately represent complex shoulder movements due to soft tissue artifacts. The regression method may have nonlinear error changes depending on humeral elevation angle and elevation plane. Therefore, we aimed to develop a new method of estimating scapular orientation using curved surface interpolation during various shoulder movements, and to compare its accuracy with conventional and regression methods. Thirteen healthy men were recruited...
November 13, 2018: Journal of Electromyography and Kinesiology
Tom Hughes, Richard K Jones, Chelsea Starbuck, Jonathan Picot, Jamie C Sergeant, Michael J Callaghan
During single leg squats (SLS), tibial angle (TA) quantification using inertial measurement units (IMU) may offer a practical alternative to frontal plane projection angle (FPPA) measurement using 2-dimensional (2D) video analysis. This study determined: (i) the reliability of IMUs and 2D video analysis for TA measurement, and 2D video analysis for FPPA measurement; (ii) the agreement between IMU TA and both 2D video TA and FPPA measurements during single leg squats in elite footballers. 18 players were tested on consecutive days...
November 10, 2018: Journal of Electromyography and Kinesiology
Micah D Josephson, Christopher A Knight
Peak power and peak rate of isometric force development (RFD) predict performance and functional mobility. Surface electromyography (EMG) is used to quantify the amplitude and rate of neuromuscular excitation. To inform the selection of EMG measures in research on rate-dependent muscle contractions, this methodological study compared amplitude-, area- and rate-based measures based on their correlations with RFD. Considering populations in whom a quiet EMG baseline is challenging, we included measures that do not require the determination of EMG onset...
November 9, 2018: Journal of Electromyography and Kinesiology
Megan E Applegate, Christopher R France, David W Russ, Samuel T Leitkam, James S Thomas
Time to task failure (TTF) on the Sørensen test predicts low back pain (LBP), but mechanisms driving TTF may vary in those with and without recurrent LBP. To determine the physiological and psychological predictors of TTF, 48 sex, age, and BMI matched participants (24 Healthy, 24 LBP) completed psychological surveys, maximal strength assessments, and the Sørensen test. A two-way ANOVA revealed no significant effects of group (p = 0.75) or sex (p = 0.21) on TTF. In the full sample, linear regression analyses revealed that normalized Median Power Frequency (MPF) slope of the Erector Spinae (β = 0...
November 9, 2018: Journal of Electromyography and Kinesiology
Samuel A Acuña, Carrie A Francis, Jason R Franz, Darryl G Thelen
The purpose of this study was to compare how healthy aging interacts with environments that challenge cognitive load and optical flow to affect antagonist leg muscle coactivation during walking. We measured leg muscle activity in sixteen older adults (70.4 ± 4.2 years) and twelve young adults (23.6 ± 3.9 years) walking on a treadmill at their preferred speed while watching a speed-matched virtual hallway. Cognitive load was challenged using a dual-task to interfere with available attentional resources...
November 8, 2018: Journal of Electromyography and Kinesiology
Laura M Kok, Jim Schrijvers, Marta Fiocco, Barend van Royen, Jaap Harlaar
PURPOSE: The aim of this study is to determine the relationship between complaints of the neck and shoulder region, the jaw-shoulder violin fixation force, and the activity of the neck and shoulder muscles in violinists. METHODS: In this case-control study twenty professional violinists were included, of which ten with current complaints of the neck shoulder region and ten without these complaints. A questionnaire including the DASH and NDI was used; violin fixation force and activity of the superficial neck muscles were evaluated in five playing conditions...
December 2018: Journal of Electromyography and Kinesiology
Dennis J Larson, Brendan L Pinto, Stephen H M Brown
This study was designed to assess the utility of using a measure of dynamic spine stability in an unfatigued, rested state as a predictor of dynamic spine stability in a challenged, fatigued state. Participants completed three trials (Day 1: Rested, Fatigued; Day 2: Recovery) during which the dynamic stability of the spine was assessed over 30 repeated flexion/extension motions using maximum finite-cycle Lyapunov exponents. Multiple sets of dynamic trunk extensions were performed to fatigue the trunk extensor muscles...
December 2018: Journal of Electromyography and Kinesiology
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