Mechanomyographic amplitude and mean power output during maximal, concentric, isokinetic muscle actions

Cramer, Joel T.; Housh, Terry J.; Johnson, Glen O.; Ebersole, Kyle T.; Perry, Sharon R.; Bull, Anthony J.

doi:10.1002/1097-4598(200012)23:12<1826::aid-mus5>3.0.co;2-7

Cited by 43 publications

(71 citation statements)

References 35 publications

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“…EMG measurements Bipolar (7.62 cm center-to-center) surface electrode (Quinton Quick Prep silver-silver chloride) arrangements were placed along the longitudinal axes of the VL and RF muscles of the dominant and non-dominant limbs (Cramer et al 2000a(Cramer et al , b, 2002bEbersole et al 1999). The interelectrode distances were selected to accommodate placing the MMG sensors between the active EMG electrodes (Cramer et al 2000a(Cramer et al , b, 2002bEbersole et al 1999;Smith et al 1998).…”

Section: Static Stretching Exercisessupporting

confidence: 91%

“…The interelectrode distances were selected to accommodate placing the MMG sensors between the active EMG electrodes (Cramer et al 2000a(Cramer et al , b, 2002bEbersole et al 1999;Smith et al 1998). The electrodes for the VL were placed over the lateral portion of the muscle at approximately the midpoint between the greater trochanter and lateral condyle of the femur.…”

Section: Static Stretching Exercisescontrasting

confidence: 89%

“…Recent evidence has also indicated that MMG amplitude is closely related to muscle power output (Cramer et al 2000a(Cramer et al , 2002a. In addition, EMG amplitude values can provide further insight regarding motor unit recruitment (Arendt-Nielsen and Mills 1985;Komi and Tesch 1979;Moritani et al 1985;Solomonow et al 1990;Westbury and Shaughnessy 1987).…”

Section: Introductionsupporting

confidence: 47%

“…For each muscle (VL and RF), a sensor was placed between the active EMG electrodes. A stabilizing ring, double-sided foam tape, and microporous tape were used to ensure consistent contact pressure of the MMG sensors (Bolton et al 1989;Cramer et al 2000aCramer et al , b, 2002aEbersole et al 1999). …”

Section: Mmg Measurementsmentioning

confidence: 99%

“…While the amplitude of the MMG signal can be influenced by factors such as muscle tension, length, mass, intramuscular pressure, and the viscosity of the surrounding medium (Orizio 1993), it has been suggested that MMG amplitude is inversely proportional to the stiffness of an active muscle (Cramer et al 2000a(Cramer et al , b, 2002cEbersole et al 2000;Evetovich et al 1997Evetovich et al , 1998Evetovich et al , 1999Smith et al 1997Smith et al , 1998. Recent evidence has also indicated that MMG amplitude is closely related to muscle power output (Cramer et al 2000a(Cramer et al , 2002a.…”

Section: Introductionmentioning

confidence: 99%

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The acute effects of static stretching on peak torque, mean power output, electromyography, and mechanomyography

et al. 2004

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The purpose of this study was to examine the acute effects of static stretching on peak torque (PT), the joint angle at PT, mean power output (MP), electromyographic (EMG) amplitude, and mechanomyographic (MMG) amplitude of the vastus lateralis (VL) and rectus femoris (RF) muscles during maximal, voluntary concentric isokinetic leg extensions at 60 and 240 degrees x s(-1) of the stretched and unstretched limbs. Twenty-one volunteers [mean age (SD) 21.5 (1.3) years] performed maximal, voluntary concentric isokinetic leg extensions for the dominant and non-dominant limbs at 60 and 240 degrees x s(-1). Surface EMG (muVrms) and MMG (mVrms) signals were recorded from the VL and RF muscles during the isokinetic tests. PT (Nm), the joint angle at PT, and MP (W) were calculated by a dynamometer. Following the initial isokinetic tests, the dominant leg extensors were stretched using four static stretching exercises. After the stretching, the isokinetic tests were repeated. PT decreased (P< or =0.05) from pre- to post-stretching for the stretched limb at 60 and 240 degrees x s(-1) and for the unstretched limb at 60 degrees x s(-1). EMG amplitude of the VL and RF also decreased (P< or =0.05) from pre- to post-stretching for the stretched and unstretched limbs. There were no stretching-induced changes (P>0.05) for the joint angle at PT, MP, or MMG amplitude. These findings indicated stretching-induced decreases in force production and muscle activation. The decreases in PT and EMG amplitude for the unstretched limb suggested that the stretching-induced decreases may be due to a central nervous system inhibitory mechanism.

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Section: Static Stretching Exercisessupporting

confidence: 91%

Section: Static Stretching Exercisescontrasting

confidence: 89%

Section: Introductionsupporting

confidence: 47%

Section: Mmg Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The acute effects of static stretching on peak torque, mean power output, electromyography, and mechanomyography

et al. 2004

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Mechanomyography

Orizio

Gobbo

2006

Wiley Encyclopedia of Biomedical Engineering

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This chapter on surface mechanomyography (MMG) is aimed to provide basic information about a relatively new biological signal detectable at the muscle surface during contraction. The text will deal with the definition and terminology; the relationship between the activity of the single motor units and the signal generation process and, as a consequence, on the MMG reliability as a tool to reveal the motor units activation strategy, the relationship between MMG and muscle mechanics to disclose the possible use of this signal to get information about muscle contractile properties; and finally some examples of practical applications in physiological and clinical studies. The goal of this chapter is not to provide an extensive review on the MMG but only to underline some physiological and technical aspects that the spreading of its use may be based on.

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Fine‐needle aspiration as a diagnostic technique in 50 cases of primary Ewing sarcoma/peripheral neuroectodermal tumor. Institut Curie's experience

Klijanienko

Couturier

Bourdeaut

et al. 2010

Diagnostic Cytopathology

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Fine-needle aspiration (FNA) followed by a core-needle biopsy during general anesthesia is a method for diagnosing pediatric tumors in our Institute. To complete the diagnosis in the case of round cell sarcomas, cytology material is also used for genomic analyses, that is, karyotyping and molecular biology-derived techniques. Fifty primary Ewing sarcomas/peripheral neuroectodermal tumors (ES/PNET) in 50 patients were sampled. Cytological diagnoses were "malignant" in all cases and accurate (ES/PNET) in 46 (92%). Two (4%) cases were misdiagnosed as neuroblastoma, and two others (4%) as rhabdomyosarcoma and nephroblastoma. No suspicious or false-negative results were rendered. Karyotyping was performed in 20 (40%) cases and was interpretable in 17 cases but not in three cases. Molecular search for ES/PNET fusion transcripts were performed in all cases and were detected in 44 (88%) cases, but not in six (12%) cases. In conclusion, FNA assisted by genomic techniques is powerful methods to accurate diagnose ES/PNET.

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Mechanomyographic amplitude and mean power output during maximal, concentric, isokinetic muscle actions

Cited by 43 publications

References 35 publications

The acute effects of static stretching on peak torque, mean power output, electromyography, and mechanomyography

The acute effects of static stretching on peak torque, mean power output, electromyography, and mechanomyography

Mechanomyography

Fine‐needle aspiration as a diagnostic technique in 50 cases of primary Ewing sarcoma/peripheral neuroectodermal tumor. Institut Curie's experience

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