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strength, conditioning, muscle

Gregory R Waryasz, Alan H Daniels, Joseph A Gil, Vladimir Suric, Craig P Eberson
Increasing emphasis on maintaining a healthy lifestyle has led many individuals to seek advice on exercise from personal trainers. There are few studies to date that evaluate personal trainer education, practice trends, and injuries they have seen while training clients. A survey was distributed to personal trainers using Survey Monkey® (Palo Alto, CA, USA) with 605 personal trainers accessing the survey. An exercise related bachelor's degree was held by 64.2% of survey participants and a certification in personal training by 89...
September 19, 2016: Orthopedic Reviews
Mariusz Naczk, Artur Lopacinski, Wioletta Brzenczek-Owczarzak, Jarosław Arlet, Alicja Naczk, Zdzisław Adach
The aim of this study was to evaluate the influence of dry-land inertial training (IT) on muscle force, muscle power, and swimming performance. Fourteen young, national-level, competitive swimmers were randomly divided into IT and control (C) groups. The experiment lasted four weeks, during which time both groups underwent their regular swimming training. In addition, the IT group underwent IT using the Inertial Training Measurement System (ITMS) three times per week. The muscle groups involved during the upsweep phase of the arm stroke in front crawl and butterfly stroke were trained...
October 19, 2016: European Journal of Sport Science
Sintip Pattanakuhar, Anchalee Pongchaidecha, Nipon Chattipakorn, Siriporn C Chattipakorn
Skeletal muscles play important roles in metabolism, energy expenditure, physical strength, and locomotive activity. Skeletal muscle fibre types in the body are heterogeneous. They can be classified as oxidative types and glycolytic types with oxidative-type are fatigue-resistant and use oxidative metabolism, while fibres with glycolytic-type are fatigue-sensitive and prefer glycolytic metabolism. Several studies demonstrated that an obese condition with abnormal metabolic parameters has been negatively correlated with the distribution of oxidative-type skeletal muscle fibres, but positively associated with that of glycolytic-type muscle fibres...
October 15, 2016: Obesity Research & Clinical Practice
Wouter J Harmsen, Gerard M Ribbers, Bart Zegers, Emiel M Sneekes, Stephan F E Praet, Majanka H Heijenbrok-Kal, Ladbon Khajeh, Fop van Kooten, Sebastiaan J C M M Neggers, Rita J van den Berg-Emons
Patients with aneurysmal subarachnoid hemorrhage (a-SAH) show long-term fatigue and face difficulties in resuming daily physical activities. Impaired muscle strength, especially of the lower extremity, impacts the performance of daily activities and may trigger the onset of fatigue complaints. The present study evaluated knee muscle strength and fatigue in patients with a-SAH. This study included 33 patients, 6 months after a-SAH, and 33 sex-matched and age-matched healthy controls. Isokinetic muscle strength of the knee extensors and flexors was measured at 60 and 180°/s...
October 12, 2016: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
Renata Spósito Roxo, Vivian Bertoni Xavier, Luiz Antônio Miorin, Andrea Olivares Magalhães, Yvoty Alves Dos Santos Sens, Vera Lúcia Dos Santos Alves
Introduction: Literature shows that patients undergoing hemodialysis present poor physical conditioning and low tolerance to exercise. They may also suffer from respiratory dysfunctions. The purpose of this study was to evaluate the effects of neuromuscular electrical stimulation on pulmonary function and functional capacity of patients with chronic kidney disease on hemodialysis. Methods: Forty adult patients with chronic kidney disease on hemodialysis were prospectively studied and randomized into two groups (control n = 20 and treatment n = 20)...
July 2016: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
Vinícius Yan Santos Nacimento, Rafaela Joyce Barbosa Torres, Natália Barros Beltrão, Priscila Soares Dos Santos, André Luiz Torres Pirauá, Valéria Mayaly Alves de Oliveira, Ana Carolina Rodarti Pitangui, Rodrigo Cappato de Araújo
This study evaluated the effects of instability on the EMG activity of scapular stabilizing and upper limb muscles during exercises with axial and rotational load. 20 male volunteers (20.9 ± 1.8 years, 174.1 ± 0.04 cm, 73.17 ± 8.77 kg) experienced in strength training participated in a crossover design. Muscle activation of anterior deltoid (AD), posterior deltoid (PD), pectoralis major (PM), biceps brachii (BB), triceps brachii (TB), upper trapezius (UT), middle trapezius (MT), lower trapezius (LT) and serratus anterior (SA) were determined on both conditions...
October 13, 2016: Journal of Applied Biomechanics
María José Acuña, Enrique Brandan
CCN2 or connective tissue growth factor (CTGF) is a matricellular protein that regulates several cellular processes. In skeletal muscle, CTGF is a key modulator of fibrogenesis, is increased in pathological conditions such as muscular dystrophies, and plays a major role in the pathology outcome. Overexpression of CTGF in skeletal muscle of wild-type mice results in muscle damage, fibrosis, and reduction of strength. In contrast, a decrease in CTGF in dystrophic mice increases strength and reduces damage and fibrosis...
2017: Methods in Molecular Biology
Geoffrey J Kerr, Matthew R McCann, Jennifer K Branch, Anusha Ratneswaran, Michael A Pest, David W Holdsworth, Frank Beier, S Jeffrey Dixon, Cheryle A Séguin
OBJECTIVE: Whole-body vibration (WBV) platforms are commercially available devices that are used clinically as potential treatments for numerous musculoskeletal conditions based on their reported ability to increase bone mineral density and muscle strength. Despite widespread use, there is an alarming lack of understanding of the direct effects of WBV on joint health. Previous work by our lab demonstrated that repeated exposure to WBV using protocols that model those used clinically, induces intervertebral disc degeneration and osteoarthritis-like damage in the knee of skeletally mature, male mice of a single outbred strain (CD-1)...
October 6, 2016: Osteoarthritis and Cartilage
Magdalena Krajewska-Włodarczyk
The clinical picture of rheumatoid arthritis covers the condition of chronic inflammation connected to the increased concentration of inflammatory mediators, reduced physical activity, immobilization caused by pain, stiffness and joint destruction as well as accompanying hormonal and metabolic disorders. It all may lead to extra-articular complications, also to the loss of muscle mass with the weakness of muscle strength, adding to the disability and significantly lowering the patients' quality of life. Sarcopenia is an advanced form of muscle mass loss which constitutes an independent and vital threat for dexterity...
2016: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
Charlotte Beaudart, Eugène McCloskey, Olivier Bruyère, Matteo Cesari, Yves Rolland, René Rizzoli, Islène Araujo de Carvalho, Jotheeswaran Amuthavalli Thiyagarajan, Ivan Bautmans, Marie-Claude Bertière, Maria Luisa Brandi, Nasser M Al-Daghri, Nansa Burlet, Etienne Cavalier, Francesca Cerreta, Antonio Cherubini, Roger Fielding, Evelien Gielen, Francesco Landi, Jean Petermans, Jean-Yves Reginster, Marjolein Visser, John Kanis, Cyrus Cooper
BACKGROUND: Sarcopenia is increasingly recognized as a correlate of ageing and is associated with increased likelihood of adverse outcomes including falls, fractures, frailty and mortality. Several tools have been recommended to assess muscle mass, muscle strength and physical performance in clinical trials. Whilst these tools have proven to be accurate and reliable in investigational settings, many are not easily applied to daily practice. METHODS: This paper is based on literature reviews performed by members of the European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis (ESCEO) working group on frailty and sarcopenia...
October 5, 2016: BMC Geriatrics
Alba Chacon-Cabrera, Joaquim Gea, Esther Barreiro
Skeletal muscle dysfunction and atrophy are characteristic features accompanying chronic conditions. Epigenetic events regulate muscle mass and function maintenance. We hypothesized that the pattern of epigenetic events (muscle-enriched microRNAs and histone acetylation) and acetylation of transcription factors known to signal muscle wasting may differ between early- and late-time points in skeletal muscles of mice exposed to hindlimb immobilization (I) and recovery following I. Body and muscle weights, grip strength, muscle-enriched microRNAs, histone deacetylases (HDACs), acetylation of proteins, histones, and transcription factors (TF), myogenic TF factors, and muscle phenotype were assessed in gastrocnemius of mice exposed to periods (1, 2, 3, 7, 15 and 30 days, I groups) of hindlimb immobilization, and in those exposed to reloading for different periods of time (1, 3, 7, 15, and 30 days, R groups) following 7-day immobilization...
October 7, 2016: Journal of Cellular Physiology
Richard Dodds, Avan Aihie Sayer
Sarcopenia and frailty are important conditions that become increasingly prevalent with age. Sarcopenia is the loss of muscle mass and function, and frailty can be defined as multi-system impairment associated with increased vulnerability to stressors. There is overlap between the two conditions, especially in terms of the physical aspects of the frailty phenotype: low grip strength, gait speed and muscle mass. These measures have been associated with a wide range of ageing outcomes and can be assessed in the clinical setting...
October 2016: Clinical Medicine: Journal of the Royal College of Physicians of London
Jens Kristian Pedersen, Magnus Christian Lydolph, Finn Somnier, Peter Junker
A 69-year-old female was admitted due to progressive loss of muscle strength following addition of fluconazole to long-term simvastatin treatment. Rhabdomyolysis was suspected and both drugs were discontinued. Forced diuresis was initiated together with a short course of prednisolone. After 21 weeks the patient had regained normal muscle strength and endurance. The favourable course and the absence of antibodies against 3-hydroxy-3-methylglutaryl-coenzyme A reductase suggest that the condition was due to interaction between the two drugs, which are both metabolized via the CYP3A4 pathway...
September 26, 2016: Ugeskrift for Laeger
Björn Gerdle, Malin Ernberg, Kaisa Mannerkorpi, Britt Larsson, Eva Kosek, Nikolaos Christidis, Bijar Ghafouri
BACKGROUND: Fibromyalgia syndrome (FMS) is associated with central alterations, but controversies exist regarding the presence and role of peripheral factors. Microdialysis (MD) can be used in vivo to study muscle alterations in FMS. Furthermore for chronic pain conditions such as FMS, the mechanisms for the positive effects of exercise are unclear. This study investigates the interstitial concentrations of algesics and metabolites in the vastus lateralis muscle of 29 women with FMS and 28 healthy women before and after an exercise intervention...
2016: PloS One
Ivan Dimauro, Mattia Scalabrin, Cristina Fantini, Elisa Grazioli, Maria Reyes Beltran Valls, Neri Mercatelli, Attilio Parisi, Stefania Sabatini, Luigi Di Luigi, Daniela Caporossi
Regular physical activity is effective as prevention and treatment for different chronic conditions related to the ageing processes. In fact, a sedentary lifestyle has been linked to a worsening of cellular ageing biomarkers such as telomere length (TL) and/or specific epigenetic changes (e.g. DNA methylation), with increase of the propensity to aging-related diseases and premature death. Extending our previous findings, we aimed to test the hypothesis that 12 weeks of low frequency, moderate intensity, explosive-type resistance training (EMRT) may attenuate age-associated genomic changes...
September 21, 2016: Redox Biology
Imen Fekhfekh, Abdelmoneem Yahia, Mokhtar Chaabene, Salma Jribi, Nizar Suissi, Mohamed Habib Elleuch, Sameh Ghroubi
OBJECTIVE: To study the acute effect of static and dynamic stretching on the knee muscle strength and postural capacity in athletes. PATIENTS AND METHODS: Fifteen judokas performed 2 stretching protocols (static and dynamic) on the muscles of both lower limbs with an interval of 48hours in a random order. An evaluation of the dominant knee muscle strength with an isokinetic dynamometer CybexNormII was performed before and after each stretching protocol in a concentric mode at a speed of 60 and 180°/s...
September 2016: Annals of Physical and Rehabilitation Medicine
Pascal Edouard, Pierrick Arnal, Philippe Gimenez, Pierre Samozino, Pedro Jimenez-Reyes, Matt Brughelli, Jurdan Mendiguchia, Jean-Benoit Morin
OBJECTIVE: The hamstring muscles are the most injured muscles in athletes practicing sprints. However, they seem greatly contributing to the production of horizontal force, a key element in the sprint acceleration performance. The aim of our study was to experimentally analyse the link between the production of horizontal force and strength of the hamstrings at maximum sprints on a treadmill and in fatigue conditions. PATIENTS AND METHODS: Fourteen male subjects accustomed to sprint participated in the experiment consisting in 12 6-seconds sprints separated by 44seconds of recovery on an instrumented treadmill sprint for measuring the horizontal force, coupled with the simultaneous recording of the EMG activity of the vastus lateralis, rectus biceps femoris and gluteus muscles...
September 2016: Annals of Physical and Rehabilitation Medicine
Abdelmoneem Yahia, Houcem Ksentini, Salma Jribi, Atika Mellek, Mohamed Habib Elleuch, Sameh Ghroubi
OBJECTIVE: The aim of the study was to investigate the relations between isokinetic muscle strength of the knee, postural profile and physical function in knee osteoarthritis patients. MATERIAL/PATIENTS AND METHODS: We included patients with advanced unilateral osteoarthritis (grades III or IV graded radiographically by Lawrence classification). We assessed functional impairment by the WOMAC score in its Arabic version, the strength of the knee muscles by isokinetic dynamometry and postural profile via the Satel(®) platform in bipodal and monopodal conditions in open and closed eyes...
September 2016: Annals of Physical and Rehabilitation Medicine
Pascal Edouard, Pierre Samozino, Romain Slotala, Jurdan Mendiguchia, Jean-Benoit Morin
Hamstring muscle injury is the main injury related to athletics, but also other sports including acceleration and sprints, with important consequences (time loss of sport and re-injury risk). In a prevention approach, a better knowledge of risk factors and mechanisms of these lesions seem relevant, and it can pass through a better understanding of the biomechanical and muscular determinants of performance in sprint and acceleration. The ability to produce a horizontal force on the ground [i.e. orienting the total push backward (or ground force reaction forward)], and to do so despite the increase in running speed, is an important determinant of sprint performance...
September 2016: Annals of Physical and Rehabilitation Medicine
Jean-Philippe Ehny, Yoshimasa Sagawa, Laurent Tatu, Ludivine Chamard, Bernard Parratte, Pierre Decavel
OBJECTIVE: Hereditary spastic paraplegia (HSP) designates a rare genetic disorder characterized by the existence of a pyramidal syndrome and/or paresis of the lower limbs, resulting in locomotor disorders. The objective of this study was to investigate the HSP patients walking characteristics during a comfortable walking speed, to determinate the most deleterious impairments and their evolutivity during a prolonged standardized walk. A second goal was to study the co-contraction of targeted muscles during these two walking conditions...
September 2016: Annals of Physical and Rehabilitation Medicine
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