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Emg and aging

Alyssandra N Baniqued, Jorge M Zuniga, Thomas C Strunc, Katie M Keenan, Agrini K Boken, Jeffrey J Anderson
The purpose of this study was to determine if the amount of subcutaneous tissue over the quadriceps affects the assessment of mean power frequency at the fatigue threshold (MPFFT). It was hypothesized that greater skinfold values will result in lower power outputs associated to the MPFFT. Fourteen adults (Mean ± SD age = 20.7 ± 0.99; body weight = 72.8 ± 12.6 kg) performed an incremental cycle ergometry test to exhaustion while surface electromyographic (EMG) signals were measured from the vastus lateralis...
2016: International Journal of Exercise Science
Biranchi Narayan Mohapatra, Sujit Kumar Lenka, Manoranjan Acharya, Chakradhar Majhi, Gouri Oram, Khetra Mohan Tudu
OBJECTIVE: To study the clinical profile of hypokalemic flaccid paralysis (HKFP) and to evaluate its causes. METHODS: Fifty cases of hypokalemic flaccid paralysis (HKFP) admitted between November 2012 to October 2014 were taken up in the study. Serum potassium level < 3.5 mmol/ltr has been taken as hypokalemia. All cases were studied for spot and/or 24 hour urinary sodium / potassium, serum potassium / calcium / magnesium. Hypokalemic periodic paralysis (HPP) were diagnosed if there was spot/24 hour urine potassium excretion < 20mmol/ltr in presence of hypokalemia and flaccid weakness without other causes...
May 2016: Journal of the Association of Physicians of India
Gavin A McKenzie, Stephen M Broski, Benjamin M Howe, Robert J Spinner, Kimberly K Amrami, Angela Dispenzieri, Michael D Ringler
OBJECTIVE: To highlight the MRI characteristics of pathologically proven amyloidosis involving the peripheral nervous system (PNS) and determine the utility of MRI in directing targeted biopsy for aiding diagnosis. MATERIALS AND METHODS: A retrospective study was performed for patients with pathologically proven PNS amyloidosis who also underwent MRI of the biopsied or excised nerve. MRI signal characteristics, nerve morphology, associated muscular denervation changes, and the presence of multifocal involvement were detailed...
October 12, 2016: Skeletal Radiology
Amelia A Miramonti, Nathaniel D M Jenkins, Preeti D Oza, Joseph P Weir, Joel T Cramer
INTRODUCTION: This study examined relationships among mechanomyographic (MMG), electromyographic (EMG), and peak twitch torque (PTT) responses as well as test-retest reliability when recorded during recruitment curves in the soleus muscle. METHODS: PTT, EMG (M-wave, H-reflex), and MMG responses were recorded during recruitment curves in 16 subjects (age=24±2y) on 2 separate days. The sum of the M-wave and H-reflex (M+H) was calculated. Correlations among variables and test-retest reliability were determined...
October 8, 2016: Muscle & Nerve
Gabriel Andrade Paz, Jason DeFreitas, Marianna de Freitas Maia, Jurandir Silva, Vicente Lima, Humberto Miranda
STUDY DESIGN: Crossover design. CONTEXT: Excessive valgus and varus force which affected the knee joint during dynamic tasks has been often associated to lower extremity injuries. Strategies to increase the resistance against these asymmetries, such as, the use of a physioball between the knees or elastic bands around the knees are often applied in rehabilitation and conditioning programs. OBJECTIVE: The purpose of this study was to investigate the effect of performing leg press (LP) 45° using a physioball and elastic band over multiple sets with submaximal loads on electromyographic (EMG) amplitude and fatigue indices...
September 26, 2016: Journal of Sport Rehabilitation
X Li, P Zhuang, M Hallett, Y Zhang, J Li, Y Li
OBJECTIVES: The study was aimed to explore oscillatory activity in the subthalamic nucleus (STN) in Parkinson's disease (PD) with off-period dystonia, a type of levodopa-induced dyskinesias (LID). METHODS: Eighteen patients with PD who underwent STN DBS were studied. Nine patients had dyskinesia defined as the LID group and nine patients who did not present any sign of dyskinesia were defined as the control group. Microelectrode recordings in the STN together with electromyogram (EMG) were recorded...
November 2016: Acta Neurologica Scandinavica
S Mello, O O'Toole, B McNamara
Older adults are at increased risk of both central and peripheral neurological disorders. Impaired nerve and muscle deficits contribute to morbidity and reduced quality of life. Our aim was to define the utilization and yield of nerve conduction studies (NCS) and electromyography (EMG) in older adults. We reviewed NCS and EMG records for all patients older than age 65 in the year 2012. Of 1,530 NCS and EMGs performed, 352 (23%) were in patients older than 65 (mean age 73.7, 52% male). 288 (83.7%) of NCS were abnormal as were 102 (71...
2016: Irish Medical Journal
Marta Gandolla, Simona Ferrante, Giancarlo Ferrigno, Davide Baldassini, Franco Molteni, Eleonora Guanziroli, Michele Cotti Cottini, Carlo Seneci, Alessandra Pedrocchi
OBJECTIVE: To design and implement an electromyography (EMG)-based controller for a hand robotic assistive device, which is able to classify the user's motion intention before the effective kinematic movement execution. METHODS: Multiple degrees-of-freedom hand grasp movements (i.e. pinching, grasp an object, grasping) were predicted by means of surface EMG signals, recorded from 10 bipolar EMG electrodes arranged in a circular configuration around the forearm 2-3 cm from the elbow...
September 27, 2016: Journal of International Medical Research
Fabrice Michel, Arnaud Dupeyron, Jean Jacques Labat, Etienne Aleton, Bernard Parratte
OBJECTIVE: Among pelvitrochanteric muscles, the internal obturator muscle is implicated in some pain projected at the buttock or perineum. Even though the pathophysiology is not completely understood, its responsibility is often held in clinical practice and in the literature due to effectiveness of botulinum toxin injections, constituting a therapeutic test. The objective is to enhance the couple ultrasound/EMG in difficult injections. MATERIAL/PATIENTS AND METHODS: Eighteen patients were treated in the physical medicine department (Besançon) from September 2015 to February 2016 for gluteal or perineal pain suspected to be related to abnormal spasm of the internal obturator muscle...
September 2016: Annals of Physical and Rehabilitation Medicine
Semiha Kurt, Betul Cevik, Durdane Aksoy, E Irmak Sahbaz, Aslı Gundogdu Eken, A Nazli Basak
Here, we describe the clinical features of several members of the same family diagnosed with Friedreich ataxia (FRDA) and cerebral lesions, demyelinating neuropathy, and late-age onset without a significant cardiac involvement and presenting with similar symptoms, although genetic testing was negative for the GAA repeat expansion in one patient of the family. The GAA repeat expansion in the frataxin gene was shown in all of the family members except in a young female patient. MRI revealed arachnoid cysts in two patients; MRI was consistent with both cavum septum pellucidum-cavum vergae and nodular signal intensity increase in one patient...
2016: Case Reports in Neurological Medicine
Paul Comfort, Amy Regan, Lee Herrington, Chris Thomas, John McMahon, Paul Jones
CONTEXT: Regular performance (~2 x week) of Nordic curls has been shown to increase hamstring strength and reduce the risk of hamstring strain injury, although no consensus on ankle position has been provided. OBJECTIVE: The aim of this study was to compare the effects of performing Nordic curls, with the ankle in a dorsiflexed (DF) or plantar flexed (PF) position, on muscle activity of the biceps femoris (BF) and medial gastrocnemius (MG). PARTICIPANTS: Fifteen (age 22...
August 24, 2016: Journal of Sport Rehabilitation
Turgay Ebiloglu, Engin Kaya, Burak Kopru, Giray Ergin, Soykan Sahin, Hasan Cem Irkilata, Yusuf Kibar
INTRODUCTION: Symptom Scales (SS) are questionnaires for evaluating and following up of special illnesses. SS used for the diagnosis and follow-up of Lower Urinary Tract Dysfunction (LUTD) in children is called LUTD Symptom Scale (LUTDSS). AIM: Aim of the present study was to identify the questions which are more important for the diagnosis of LUTD in children and create a simpler SS. MATERIALS AND METHODS: From January 2005 to March 2015, 631 children between the age 5 and 15 were enrolled in this study...
July 2016: Journal of Clinical and Diagnostic Research: JCDR
Nicole J Gervais, Shaun S Viechweg, Jessica A Mong, Agnès Lacreuse
Menopausal women often suffer from hot flashes and sleep disturbances that significantly impact their quality of life. Both human and animal studies suggest that loss of estrogens during menopause contribute to these symptoms. In the female rat, both core body temperature (CBT) and sleep are sensitive to 17β-estradiol (E2) levels, but important differences between the rat and the human patterns limit the interpretation of the results. The sleep and thermoregulation of the common marmoset (Callithrix jacchus) more closely resemble human patterns...
September 9, 2016: Neuroscience
Arnon Karni, Ali Asmail, Vivian E Drory, Hadar Kolb, Anat Kesler
The reasons for the abrogation of self-immunological tolerance in patients with myasthenia gravis (MG) may be different between those with concomitant thymic hyperplasia or thymoma, and those with no evidence of thymic involvement. We conducted a retrospective observational case series study to investigate the epidemiology as well as the clinical, serologic, and electromyographic (EMG) characteristics of individuals diagnosed as having MG. We found that the average age at MG onset of patients with either thymic hyperplasia or thymoma was much younger (by ~20years) than that of MG patients without thymic involvement...
September 15, 2016: Journal of Neuroimmunology
Justin J Kavanagh, Matthew R Feldman, Michael J Simmonds
The aim of this study was to investigate how maximal intermittent contractions for a hand muscle influence cortical and reflex activity, as well as the ability to voluntarily activate, the homologous muscle in the opposite limb. Twelve healthy subjects (age: 24 ± 3 years, all right hand dominant) performed maximal contractions of the dominant limb first dorsal interosseous (FDI), and activity of the contralateral FDI was examined in a series of experiments. Index finger abduction force, FDI EMG, motor evoked potentials and heteronomous reflexes were obtained from the contralateral limb during brief non-fatiguing contractions...
September 7, 2016: Journal of Neurophysiology
Sameh Hany Emile, Hossam Ayman Elfeki, Hosam Ghazy Elbanna, Mohamed Youssef, Waleed Thabet, Tito M Abd El-Hamed, Basem Said, Ahmed Lotfy
AIM: To evaluate the efficacy and safety of botulinum toxin type A (BTX-A) in the management of patients with anismus. METHODS: An organized search of published literature was conducted using electronic databases including: PubMed/MEDLINE, and Cochrane Central Register of Controlled Trials, also an internet-based search using "Google Scholar" service was conducted. Both comparative and observational studies were included. We excluded irrelevant articles, editorials, case reports, reviews, and meta-analyses...
August 6, 2016: World Journal of Gastrointestinal Pharmacology and Therapeutics
Kazimierz Tomczykiewicz
Cervical dystonia is the most common form of dystonia in adult age. It is characterized by involuntary muscle contractions that cause abnormal movements and positioning of the head and neck. Symptoms of it are often associated with pain. This distinguishes this form from other dystonia. The drug of choice is botulinum toxin. It effectively reduces both pain and abnormal excessive muscle activity. In some cases, particularly where there is not obtained the full recovery after treatment botulinum toxin we used drugs for systemic effect...
August 2016: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
Kazimierz Cervical Dystonia Treatment With Botulin Toxin
Cervical dystonia is the most common form of dystonia in adult age. It is characterized by involuntary muscle contractions that cause abnormal movements and positioning of the head and neck. Symptoms of it are often associated with pain. This distinguishes this form from other dystonia. The drug of choice is botulinum toxin. It effectively reduces both pain and abnormal excessive muscle activity. In some cases, particularly where there is not obtained the full recovery after treatment botulinum toxin we used drugs for systemic effect...
July 2016: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
In-Cheol Jeon, Ui-Jae Hwang, Sung-Hoon Jung, Oh-Yun Kwon
OBJECTIVE: To compare the surface electromyography (EMG) amplitude of the hip joint, including the gluteus maximus (GM), biceps femoris (BF), and semitendinosus (ST) muscles generated by three different exercises: prone hip extension (PHE), prone table hip extension (PTHE), and prone table hip extension with 90° knee flexion (PTHEK), with compensatory pelvic motions. DESIGN: Repeated-measure within-subject intervention. PARTICIPANTS: Sixteen-healthy males (mean age = 23...
March 26, 2016: Physical Therapy in Sport
Hyun Gu Kang, Jonathan B Dingwell
Age-related gait changes may be due to the loss of complexity in the neuromuscular system. This theory is disputed due to inconsistent results from single-scale analyses. Also, behavioral adaptations may confound these changes. We examined whether EMG dynamics during gait is less complex in older adults over a range of timescales using the multiscale entropy method, and whether slower walking attenuates this effect. Surface EMG was measured from the left vastus lateralis (VL), biceps femoris (BF), gastrocnemius (GA), and tibialis anterior (TA) in 17 young and 18 older adults as they walked on a treadmill for 5 minutes at 0...
2016: PloS One
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