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Results 1 - 10
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57
Original Article Electromyographic (EMG) Analysis of Quadriceps Muscle Fatigue in Children With Cerebral Palsy During a Sustained Isometric Contraction
"... The purpose of this investigation was to determine whether changes in surface electromyography (EMG) data during an isometric muscle protocol, in combination with maximal voluntary isometric force, provide information on fatigue occurrence and exercise limitation in children with cerebral palsy. Twe ..."
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. Twelve children with cerebral palsy and 10 age-matched controls completed an assessment of quadriceps muscle fatigue on an isokinetic device with surface EMG measurements, during a sustained isometric contraction at 50 % of the maximal voluntary isometric force. The EMG data collected in participants
The Relationship between Muscle Temperature, MUAP Conduction Velocity and the Amplitude and Frequency Components of the Surface EMG During Isometric Contractions
"... The relationship between the tension developed during brief isometric contractions and the frequency and amplitude components of the surface EMG were recorded in 5 male subjects after immersion of their arms and legs in water at 24, 27, 34 and 37 deg. C. for 20 min. The muscles examined were the han ..."
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amplitude and tension for brief isometric contractions was nearly linear. The frequency components of the EMG as assessed by Fourier Analysis of the raw EMG and MUAP conduction velocity, were largely unaffected by muscle tension but was dramatically affected by muscle temperature. During fatiguing
Time-frequency parameters of the surface myoelectric signal for assessing muscle fatigue during cyclic dynamic contractions
- IEEE Trans. Biomed. Eng
"... Abstract-The time-dependent shift in the spectral content of the surface myoelectricsignal to lowerfrequencieshas provento be a useful tool for assessinglocalizedmuscle fatigue. Unfortunately, the technique has been restricted to constant-force,isometric contractions because of limitations in the pr ..."
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during cyclicdynamic contractions. Changes in muscle length, force, and electrode position contribute to the nonstationarity of the surface myoelectricsignal. These factors, unrelated to localized fatigue, can be constrained and isolated for cyclic dynamic contractions, where they are assumed
Effect of isotonic and isometric knee extension exercises on mechanical and electromyographical specificity of fatigue
"... Abstract.: This study investigated the effects of isotonic and isometric knee extension exercises on strength, power, and surface EMG in male and female populations. Using the knee extensors, ten males and ten females performed a 120 s MVIC and 120 maximal isotonic contractions. Prior to each exerc ..."
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exercise (t = pre) knee extensor isometric peak torque (strength) and average peak power (power) were tested utilizing three, 3 s MVIC's and three maximal isotonic contractions, respectively. Following each exercise, strength and power were assessed immediately after (t =: 00) and at 2.5 (t =: 02
Fatigability Is Increased With Age During Velocity-Dependent Contractions of the Dorsiflexors
"... Background. Muscle power is more relevant to the activities of daily living than is isometric strength. However, dynamic contractions have received little attention as they relate to the effect of age on muscle fatigue, particularly in very old persons. Thus, the purpose of this study was to investi ..."
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Background. Muscle power is more relevant to the activities of daily living than is isometric strength. However, dynamic contractions have received little attention as they relate to the effect of age on muscle fatigue, particularly in very old persons. Thus, the purpose of this study
Strategies to Identify Muscle Fatigue from SEMG During Cycling
"... Detection, quantification and analysis of muscle fatigue are crucial in occupational/rehabilitation and sporting settings. Sports organizations such as Australian Institute of Sports (AIS) currently monitor fatigue by a battery of tests including invasive techniques that require taking blood samples ..."
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of SEMG based techniques is currently limited to isometric contraction and is not acceptable to the human movement community. This paper proposes and tests a simple signal processing technique to identify the onset of muscle fatigue during cyclic activities of muscles such as VL and VM during cycling
Higher Neuromuscular Manifestations of Fatigue in Dynamic than Isometric Pull-Up Tasks in Rock Climbers by
"... Neuromuscular assessment of rock climbers has been mainly focused on forearm muscles in the literature. We aimed to extend the body of knowledge investigating on two other upper limb muscles during sport-specific activities in nine male rock climbers. We assessed neuromuscular manifestations of fati ..."
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Neuromuscular assessment of rock climbers has been mainly focused on forearm muscles in the literature. We aimed to extend the body of knowledge investigating on two other upper limb muscles during sport-specific activities in nine male rock climbers. We assessed neuromuscular manifestations
1EMG SIGNS OF FATIGUE IN ANTERIOR AND POSTERIOR DELTOID MUSCLES: QUESTIONING THE ROLE OF RMS DURING FATIGUE
"... Abstract- When a skeletal muscle fails to maintain a required force of contraction, it is fatigued. While the time-dependent shift in mean power frequency (MPF) of electromyographic (EMG) signals to lower frequencies is a well-established indicator of fatigue, the change in root mean squared (RMS) v ..."
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) values of EMG signal has not been interpreted consistently in literature. This research investigates localized muscle fatigue in anterior and posterior deltoid muscles during isometric, isotonic, sustained contractions by examining patterns of fatigue through spectral and amplitude analysis of EMG
Effects of series compliance on twitches superimposed on voluntary contractions
"... series compliance on twitches superimposed on voluntary contrac-tions. J. Appl. Physiol. 73(2): 516~521,1992.-The activation of skeletal muscle during voluntary isometric contraction has been assessed by measuring the increase in force caused by a superimposed maximal shock to the motor nerve (the t ..."
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series compliance on twitches superimposed on voluntary contrac-tions. J. Appl. Physiol. 73(2): 516~521,1992.-The activation of skeletal muscle during voluntary isometric contraction has been assessed by measuring the increase in force caused by a superimposed maximal shock to the motor nerve (the
Hamstring Muscle Fatigue and Central Motor Output during a Simulated Soccer Match
"... Purpose: To examine changes in hamstring muscle fatigue and central motor output during a 90-minute simulated soccer match, and the concomitant changes in hamstring maximal torque and rate of torque development. Method: Eight amateur male soccer players performed a 90-minute simulated soccer match, ..."
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, with measures performed at the start of and every 15-minutes during each half. Maximal torque (Nm) and rate of torque development (RTD; Nm.s–1) were calculated from maximal isometric knee flexor contractions performed at 10u of flexion. Hamstring peripheral fatigue was assessed from changes in the size
Results 1 - 10
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57
