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muscle aging

Alan Pestronk, Richard Keeling, Rati Choksi
OBJECTIVE: We studied mitochondrial impairment as a factor in the pathologic equivalent of sarcopenia, muscle fiber atrophy associated with increased age. METHODS: Mitochondrial oxidative enzyme activities and coenzyme Q10 levels were measured in frozen human proximal limb muscles with combined age and atrophy, age alone, atrophy alone, denervation, immune myopathies, and mitochondrial disorders with ophthalmoplegia. RESULTS: Sarcopenia (age and atrophy) had reduced mean activities of mitochondrial Complexes I, II, and II+III, with severe reduction of Complex I activity in 54% of patients...
October 19, 2016: Muscle & Nerve
Robert M Kwee, Shivani Ahlawat, Jan Fritz
OBJECTIVE: To determine the frequency of magnetic resonance imaging (MRI) findings of ischiofemoral impingement (IFI) in patients with inflammatory myositis (IM) and associated factors. METHODS: Pelvis and thigh MRI studies of 314 consecutive patients (57% women; mean age, 55.5 years; range, 18-85) with suspected muscle disease were reviewed. RESULTS: Ischiofemoral impingement at MRI was present in 11% of patients with a final diagnosis of IM and in 2% of patients with an alternative diagnosis (P = 0...
October 18, 2016: Journal of Computer Assisted Tomography
Tomonori Sato, Yoshiaki Ito, Takashi Nagasawa
Sarcopenia is a condition of the loss of muscle mass that is associated with aging and that increases the risk for bedridden state, thereby warranting studies of interventions that attenuate sarcopenia. Here the effects of 2-month dietary L-lysine (Lys) supplementation (1.5-3.0 %) on myofibrillar protein degradation and major proteolytic systems were investigated in senescence-accelerated mouse prone 8 (SAMP8). At 36 weeks of age, skeletal muscle and lean body mass was reduced in SAMP8 when compared with control senescence-accelerated mouse resistant 1 (SAMR1)...
October 17, 2016: Biogerontology
Ioanna Eleftheriadou, Ioannis Manolaras, Elaine E Irvine, Michael Dieringer, Antonio Trabalza, Nicholas D Mazarakis
OBJECTIVE: We have previously described the generation of coxsackievirus and adenovirus receptor (α CAR)-targeted vector, and shown that intramuscular delivery in mouse leg muscles resulted in specific retrograde transduction of lumbar-motor neurons (MNs). Here, we utilized the α CAR-targeted vector to investigate the in vivo neuroprotective effects of lentivirally expressed IGF-1 for inducing neuronal survival and ameliorating the neuropathology and behavioral phenotypes of the SOD1(G93A) mouse model of ALS...
October 2016: Annals of Clinical and Translational Neurology
Stefano Schiaffino, Bert Blaauw, Kenneth A Dyar
The circadian oscillations of muscle genes are controlled either directly by the intrinsic muscle clock or by extrinsic factors, such as feeding, hormonal signals, or neural influences, which are in turn regulated by the central pacemaker, the suprachiasmatic nucleus of the hypothalamus. A unique feature of circadian rhythms in skeletal muscle is motor neuron-dependent contractile activity, which can affect the oscillation of a number of muscle genes independently of the muscle clock. The role of the intrinsic muscle clock has been investigated using different Bmal1 knockout (KO) models...
2016: Skeletal Muscle
Y M Zheng, W Z Li, Z X Wang, W Zhang, H Lv, J X Xiao, Y Yuan
OBJECTIVE: To report thigh muscle magnetic resonance imaging (MRI) tests of four Chinese patients with dystrophinopathy with edema changes in adductor longus muscles that mimics adductor enthesopathy. METHODS: Four boys, who were from four unrelated families and aged from 5 to 11 years, were investigated because of the clinical manifestations including myalgia or muscle weakness or the incidental findings of elevated serum creatine kinase levels, and were diagnosed with dystrophinopathy by gene test of Duchenne muscular dystrophy (DMD)...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Y M Zheng, J DU, W Z Li, Z X Wang, W Zhang, J X Xiao, Y Yuan
OBJECTIVE: To describe a method based on analysis of the histogram of intensity values produced from the magnetic resonance imaging (MRI) for quantifying the degree of fatty infiltration. METHODS: The study included 25 patients with dystrophinopathy. All the subjects underwent muscle MRI test at thigh level. The histogram M values of 250 muscles adjusted for subcutaneous fat, representing the degree of fatty infiltration, were compared with the expert visual reading using the modified Mercuri scale...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Jésus Gonzalez-Bermejo, Capucine Morélot-Panzini, Marie-Laure Tanguy, Vincent Meininger, Pierre-François Pradat, Timothée Lenglet, Gaëlle Bruneteau, Nadine Le Forestier, Philippe Couratier, Nathalie Guy, Claude Desnuelle, Hélène Prigent, Christophe Perrin, Valérie Attali, Catherine Fargeot, Marie-Cécile Nierat, Catherine Royer, Fabrice Ménégaux, François Salachas, Thomas Similowski
BACKGROUND: Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disorder associated with respiratory muscle weakness and respiratory failure. Non-invasive ventilation alleviates respiratory symptoms and prolongs life, but is a palliative intervention. Slowing the deterioration of diaphragm function before respiratory failure would be desirable. We aimed to assess whether early diaphragm pacing could slow down diaphragm deterioration and would therefore delay the need for non-invasive ventilation...
November 2016: Lancet Neurology
Jagdish C Mohan, Madhu Shukla, Vishwas Mohan, Arvind Sethi
Parachute mitral valve and Pacman heart (incomplete muscular ventricular septal defect) are rare congenital deformities usually reported in infants and children. Very few adult patients with these anomalies are reported but the association of the two has not been described. This report describes a 56-year-old male with exertional dyspnea who was detected to have moderately severe mitral regurgitation and mitral stenosis. Typical parachute deformity of the mitral valve with a reduced opening and common attachment of all the chordae to a single posteromedial papillary muscle was evident...
September 2016: Indian Heart Journal
Brooks V Udelsman, Jessica Eaton, Ashok Muniappan, Christopher R Morse, Cameron D Wright, Douglas J Mathisen
OBJECTIVE: Patients with complicated airway defects that exceed the limits of primary repair represent a challenging clinical problem and require alternative techniques for repair. The aim of this study was to evaluate bioprosthetic reconstruction of large tracheal and bronchial defects. METHODS: Retrospective chart review of patients treated at a single tertiary center from 2008 to 2015 who underwent repair of tracheal or bronchial defects with a bioprosthetic device, namely aortic homograft or acellular dermal matrix...
November 2016: Journal of Thoracic and Cardiovascular Surgery
Morad Chughtai, Anil Bhave, Sabahat Z Khan, Anton Khlopas, Osman Ali, Steven F Harwin, Michael A Mont
The use of a pneumatic unloader brace has been shown in pilot studies to decrease pain and increase muscle strength in patients with knee osteoarthritis (OA). Therefore, we analyzed patients who had knee OA, and either received a pneumatic unloader brace and conventional treatment or conventional treatment alone. Specifically, we assessed: (1) use of pain relieving injections; (2) opioid consumption; and (3) the eventual need for total knee arthroplasty (TKA) in the above-mentioned cohort. We performed an analysis of a longitudinally maintained database of patients from a prospective, randomized, single center study...
October 17, 2016: Journal of Knee Surgery
Ilse Reinders, Marjolein Visser, Laura Schaap
PURPOSE OF REVIEW: Aging is associated with various changes in body composition, including changes in weight, loss of muscle mass, and increase in fat mass. This article describes the role of body weight and body composition, and their changes, in the risk of frailty in old age. RECENT FINDINGS: Based on current literature, observational studies on obesity and high waist circumference show most convincing results for an association with frailty. The independent role of muscle mass and muscle fat infiltration remains unclear, mainly due to a lack of studies and a lack of accurate measurement of body composition by computed tomography or MRI...
September 28, 2016: Current Opinion in Clinical Nutrition and Metabolic Care
Angela M Sanford
PURPOSE OF REVIEW: The purpose of this review is to examine the concept of anorexia of aging, including its complex pathophysiology and the multifaceted interventions required to prevent adverse health consequences from this geriatric syndrome. RECENT FINDINGS: Anorexia of aging is extremely common, occurring in up to 30% of elderly individuals; however, this diagnosis is frequently missed or erroneously attributed to a normal part of the aging process. With aging, impairments in smell and taste can limit the desire to eat...
October 5, 2016: Current Opinion in Clinical Nutrition and Metabolic Care
Tanja Radovanovic, Slobodan Spasojevic, Vesna Stojanovic, Aleksandra Doronjski
INTRODUCTION: An apparent life-threatening event (ALTE) is defined as "an episode that is frightening to the observer and is characterized by some combination of apnea, color change, marked change of muscle tone, choking, or gagging." OBJECTIVE: The aims of this study were to determine etiology and outcome of severe ALTE (requiring resuscitation measures) and to review diagnostic approaches in infants hospitalized after such an episode of ALTE. METHODS: Retrospective analysis included patients hospitalized at the Intensive Care Unit, Institute of Child and Youth Healthcare of Vojvodina, after an episode of severe ALTE over a 4-year period...
September 30, 2016: Pediatric Emergency Care
Mei-Yun Liaw, Lin-Yi Wang, Ya-Ping Pong, Yu-Chin Tsai, Yu-Chi Huang, Tsung-Hsun Yang, Meng-Chih Lin
The aim of this study was to investigate the relationships between pulmonary function, respiratory muscle strength, perceived dyspnea, degree of fatigue, and activity of daily living with motor function and neurological status in stroke patients with stable congestive heart failure (CHF).This was a cohort study in a tertiary care medical center. Stroke patients with CHF and exertional dyspnea (New York Heart Association class I-III) were recruited. The baseline characteristics included duration of disease, Brunnstrom stage, spirometry, resting heart rate, resting oxyhemoglobin saturation (SpO2), maximal inspiratory pressure (MIP), maximal expiratory pressure (MEP), Borg scale, fatigue scale, and Barthel index...
October 2016: Medicine (Baltimore)
Sherif Galal
: Developmental coxa vara (DCV) develops during early childhood between the age of independent walking and 6 years. The deformity includes a decrease in the neck-shaft angle and femoral retroversion. Recently, good results have been reported using external fixator systems for the correction of proximal femoral deformities secondary to slipped capital femoral epiphysis, Perthes' disease in children, and percutaneous proximal femoral osteotomy for coxa vara. This preliminary study was performed to evaluate the results of percutaneous subtrochanteric osteotomy in restoring the normal alignment and orientation (radiographic outcome), thereby restoring the normal mechanics of the hip joint, overcoming shortening of the limb, and re-establishing the length-tension relationship of the abductor muscles (functional outcome)...
September 29, 2016: Journal of Pediatric Orthopedics. Part B
Rhett L Peterson, Kate C Parkinson, Jeffrey B Mason
Previously, transplantation of ovaries from young cycling mice into old postreproductive-age mice increased life span. We anticipated that the same factors that increased life span could also influence health span. Female CBA/J mice received new (60 d) ovaries at 12 and 17 months of age and were evaluated at 16 and 25 months of age, respectively. There were no significant differences in body weight among any age or treatment group. The percentage of fat mass was significantly increased at 13 and 16 months of age but was reduced by ovarian transplantation in 16-month-old mice...
2016: Journal of Transplantation
Bipradas Roy, Mary E Curtis, Letimicia S Fears, Samuel N Nahashon, Hugh M Fentress
Obesity and osteoporosis are two alarming health disorders prominent among middle and old age populations, and the numbers of those affected by these two disorders are increasing. It is estimated that more than 600 million adults are obese and over 200 million people have osteoporosis worldwide. Interestingly, both of these abnormalities share some common features including a genetic predisposition, and a common origin: bone marrow mesenchymal stromal cells. Obesity is characterized by the expression of leptin, adiponectin, interleukin 6 (IL-6), interleukin 10 (IL-10), monocyte chemotactic protein-1 (MCP-1), tumor necrosis factor-alpha (TNF-α), macrophage colony stimulating factor (M-CSF), growth hormone (GH), parathyroid hormone (PTH), angiotensin II (Ang II), 5-hydroxy-tryptamine (5-HT), Advance glycation end products (AGE), and myostatin, which exert their effects by modulating the signaling pathways within bone and muscle...
2016: Frontiers in Physiology
Andrea Marchi, Vlasta Bari, Beatrice De Maria, Murray Esler, Elisabeth Lambert, Mathias Baumert, Alberto Porta
We propose a sympathetic baroreflex (sBR) sequence method for characterizing sBR from spontaneous beat-to-beat fluctuations of muscle sympathetic nerve activity (MSNA) and diastolic arterial pressure (DAP). The method exploits a previously defined MSNA variability quantifying the fluctuations of MSNA burst rate. The method is based on the detection of MSNA and DAP sequences characterized by the contemporaneous DAP increase and MSNA decrease or vice versa. The percentage of sBR sequences (SEQ%sBR) was taken as an indication of the degree of sBR solicitation and the average slope of the regression lines in the (DAP, MSNA) plane was taken as sBR sensitivity (sBRSSEQ) and expressed in bursts(...
2016: Frontiers in Physiology
Jung-In Kim, Young-Jun Choi, Hyun-Min Seo, Han-Saem Kim, Jae Yun Lim, Dong-Hoon Kim, Seoung Wan Chae, Ga-Young Lee, Won-Serk Kim
Pleomorphic dermal sarcoma (PDS) is a rare mesenchymal neoplasm sharing histopathological features with atypical fibroxanthoma (AFX), but has additional features of deep invasion of the superficial subcutis, tumor necrosis and vascular/perineural invasion. It is not well documented in the literature because of its rarity, and its clinical course has been debated due to the lack of homogenous criteria. We describe here the case of a 91-year-old female with a 6-month history of a solitary, asymptomatic, well-defined, 3...
October 2016: Annals of Dermatology
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