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https://www.readbyqxmd.com/read/28222580/acute-and-delayed-responses-of-steroidal-hormones-blood-lactate-and-biomarkers-of-muscle-damage-after-a-resistance-training-session-time-of-day-effects
#1
Achraf Ammar, Hamdi Chtourou, Mouna Turki, Omar Hammouda, Ahmed Chaari, Mariem Boudaya, Tarak Driss, Fatma Ayedi, Nizar Souissi
BACKGROUND: The present study aimed to investigate the effect of time-of-days (TOD) on some biochemical and hormonal responses after resistance training sessions. METHODS: Ten trained subjects (22±2 years) performed, in randomized order, three resistance-training-sessions at 07h:00, 13h:00 and 17h:00. Each training-session included six upper and lower body resistance exercises with 3×10 repetitions. Blood lactate (Lac), creatine kinase (CK), lactate dehydrogenase (LDH), cortisol (C) and testosterone (T) were collected at rest, 3min and 48h after each-session...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28221668/effect-of-physical-activity-versus-health-education-on-physical-function-grip-strength-and-mobility
#2
Adam J Santanasto, Nancy W Glynn, Laura C Lovato, Steven N Blair, Roger A Fielding, Thomas M Gill, Jack M Guralnik, Fang-Chi Hsu, Abby C King, Elsa S Strotmeyer, Todd M Manini, Anthony P Marsh, Mary M McDermott, Bret H Goodpaster, Marco Pahor, Anne B Newman
BACKGROUND: Physical activity (PA) reduces the rate of mobility disability, compared with health education (HE), in at risk older adults. It is important to understand aspects of performance contributing to this benefit. OBJECTIVE: To evaluate intervention effects on tertiary physical performance outcomes. DESIGN: The Lifestyle Interventions and Independence for Elders (LIFE) was a multi-centered, single-blind randomized trial of older adults...
February 21, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28220715/a-systematic-review-of-mechanisms-of-gait-speed-change-post-stroke-part-1-spatiotemporal-parameters-and-asymmetry-ratios
#3
Elizabeth C Wonsetler, Mark G Bowden
BACKGROUND: In walking rehabilitation trials, self-selected walking speed (SSWS) has emerged as the dominant outcome measure to assess walking ability. However, this measure cannot differentiate between recovery of impaired movement and compensation strategies. Spatiotemporal variables and asymmetry ratios are frequently used to quantify gait deviations and are hypothesized markers of recovery. OBJECTIVES: The purpose of this review is to investigate spatiotemporal variables and asymmetry ratios as mechanistic recovery measures in physical therapy intervention studies post-stroke...
February 21, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28219107/chronic-blood-pressure-reductions-and-increments-in-plasma-nitric-oxide-bioavailability
#4
Crisieli M Tomeleri, Alexandre J Marcori, Alex Silva Ribeiro, Aline Mendes Gerage, Camila de Souza Padilha, Durcelina Schiavoni, Mariana F Souza, Jerry L Mayhew, Matheus Amarante do Nascimento, Danielle Venturini, Decio Sabbatini Barbosa, Edilson Serpeloni Cyrino
This study analyzed the effects of 12 weeks of resistance training (RT) on resting blood pressure (BP) and plasma levels of nitric oxide metabolites (NOx) in pre- and hypertensive older women, and evaluated the relationship between these 2 parameters. Thirty-five older women (68.2±5.7 years, 70.0±14.4 kg, 157.1±6.4 cm, 28.3±5.0 kg.m(-2)) were randomly allocated into a training group (TG; n=17), which performed a 12-week RT program, and a control group (CG; n=18), which did not perform any physical exercise...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219105/effects-of-resistance-training-volume-on-mmps-in-circulation-muscle-and-adipose-tissue
#5
Ivo Vieira de Sousa Neto, Ramires Alsamir Tibana, Dahan da Cunha Nascimento, Denis César Leite Vieira, Joao Luiz Quagliotti Durigan, Guilherme Borges Pereira, James Wilfred Navalta, Rita de Cássia Marqueti, Jonato Prestes
The aim of this study was to investigate the effects of different resistance training (RT) volumes on MMP activity in skeletal muscle, visceral adipose tissue and circulation. 21 Wistar rats were randomly divided into 3 groups (n=7 per group): sedentary control (SC); RT with 4 ladder climbs (RT-4; 50, 75, 90 and 100% of their maximal carrying capacity) and RT with 8 ladder climbs (RT-8 with 2 sets for each load). The 8-week RT consisted of climbing a 1.1-m vertical ladder with weights secured to the animals' tails...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28218021/a-systematic-review-of-mechanisms-of-gait-speed-change-post-stroke-part-2-exercise-capacity-muscle-activation-kinetics-and-kinematics
#6
Elizabeth C Wonsetler, Mark G Bowden
BACKGROUND: Regaining locomotor ability is a primary goal in stroke rehabilitation and is most commonly measured using changes in self-selected walking speed. However, walking speed cannot identify the mechanisms by which an individual recovers. Laboratory-based mechanistic measures such as exercise capacity, muscle activation, force production, and movement analysis variables may better explain neurologic recovery. OBJECTIVES: The objectives of this systematic review are to examine changes in mechanistic gait outcomes and describe motor recovery as quantified by changes in laboratory-based mechanistic variables in rehabilitation trials...
February 20, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28216120/no-impact-of-repeated-extinction-exposures-on-operant-responding-maintained-by-different-reinforcer-rates
#7
John Y H Bai, Christopher A Podlesnik
Greater rates of intermittent reinforcement in the presence of discriminative stimuli generally produce greater resistance to extinction, consistent with predictions of behavioral momentum theory. Other studies reveal more rapid extinction with higher rates of reinforcers - the partial reinforcement extinction effect. Further, repeated extinction often produces more rapid decreases in operant responding due to learning a discrimination between training and extinction contingencies. The present study examined extinction repeatedly with training with different rates of intermittent reinforcement in a multiple schedule...
February 16, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28215279/about-training-and-memory-nk-cell-adaptation-to-viral-infections
#8
Q Hammer, C Romagnani
Viral infections continuously challenge and shape our immune system. Due to their fine antigen recognition ability, adaptive lymphocytes protect against pathogen reencounter by generating specific immunological memory. Innate cells such as macrophages also adapt to pathogen challenge and mount resistance to reinfection, a phenomenon termed trained immunity. As part of the innate immunity, natural killer (NK) cells can display rapid effector functions and play a crucial role in the control of viral infections, especially by the β-herpesvirus cytomegalovirus (CMV)...
2017: Advances in Immunology
https://www.readbyqxmd.com/read/28214041/why-intensity-is-not-a-bad-word-optimizing-health-status-at-any-age
#9
REVIEW
Gary R Hunter, Eric P Plaisance, Stephen J Carter, Gordon Fisher
Age-related declines in health and function make locomotion increasingly difficult leading to reductions in non-exercise activity thermogenesis (NEAT), skeletal muscle size and strength, and increased adiposity. Exercise is an important strategy to attenuate loss of function through the life cycle. Despite claims to the contrary, high-intensity exercise is important for the prevention of obesity and sarcopenia with advancing age. Therefore, the purpose of this mini-review is to present literature supporting the contention that low volume, high-intensity aerobic and/or resistance training can slow sarcopenia, sustain ease of movement, stimulate NEAT, and attenuate the accretion of fat mass...
February 9, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28209739/myocardial-ischemic-tolerance-in-rats-subjected-to-endurance-exercise-training-during-adaptation-to-chronic-hypoxia
#10
Petra Alánová, Anna Chytilová, Jan Neckář, Jaroslav Hrdlička, Petra Míčová, Kristýna Holzerová, Markéta Hlaváčková, Kristýna Macháčková, František Papoušek, Jana Vašinová, Daniel Benák, Olga Nováková, František Kolář
Chronic hypoxia and exercise are natural stimuli that confer sustainable cardioprotection against ischemia/reperfusion (I/R) injury but it is unknown whether they can act in synergy to enhance ischemic resistance. Inflammatory response mediated by tumor necrosis factor-α (TNF-α) plays a role in the infarct size-limitation by continuous normobaric hypoxia (CNH) whereas exercise is associated with anti-inflammatory effects. This study was conducted to determine whether exercise training performed under conditions of CNH (12% O2) affects myocardial ischemic resistance with respect to inflammatory and redox status...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28209634/cognitive-decline-in-prostate-cancer-patients-undergoing-adt
#11
Niamh Liana Mundell, Robin M Daly, Helen Macpherson, Steve F Fraser
Androgen deprivation therapy (ADT) is an effective and widely prescribed treatment for prostate cancer (PCa), but it is associated with multiple treatment induced adverse effects that impact on various musculoskeletal and cardiometabolic health outcomes. Emerging research has shown that ADT is also associated with cognitive impairment, which has been linked to a loss of independence, increased falls and fracture risk and greater use of medical services. The aim of this review is to outline the evidence related to the effect of ADT use on cognitive function, and propose a role for exercise training as part of usual care to prevent and/or manage cognitive impairments for PCa survivors on ADT...
February 16, 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28207951/endurance-capacity-and-neuromuscular-fatigue-following-high-vs-moderate-intensity-endurance-training-a-randomised-trial
#12
Thomas J O'Leary, Johnny Collett, Ken Howells, Martyn G Morris
High-intensity exercise induces significant central and peripheral fatigue, however the effect of endurance training on these mechanisms of fatigue is poorly understood. We compared the effect of cycling endurance training of disparate intensities on high-intensity exercise endurance capacity and the associated limiting central and peripheral fatigue mechanisms. Twenty adults were randomly assigned to 6 weeks of either high-intensity interval training (HIIT, 6-8 × 5 min at halfway between lactate threshold and maximal oxygen uptake [50%Δ]) or volume matched moderate-intensity continuous training (CONT, ~60-80 min at 90% lactate threshold)...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28207880/skeletal-muscle-metabolic-adaptations-to-endurance-exercise-training-are-attainable-in-mice-with-simvastatin-treatment
#13
William M Southern, Anna S Nichenko, Daniel D Shill, Corey C Spencer, Nathan T Jenkins, Kevin K McCully, Jarrod A Call
We tested the hypothesis that a 6-week regimen of simvastatin would attenuate skeletal muscle adaptation to low-intensity exercise. Male C57BL/6J wildtype mice were subjected to 6-weeks of voluntary wheel running or normal cage activities with or without simvastatin treatment (20 mg/kg/d, n = 7-8 per group). Adaptations in in vivo fatigue resistance were determined by a treadmill running test, and by ankle plantarflexor contractile assessment. The tibialis anterior, gastrocnemius, and plantaris muscles were evaluated for exercised-induced mitochondrial adaptations (i...
2017: PloS One
https://www.readbyqxmd.com/read/28207082/the-infectious-disease-manpower-crisis-finding-the-cure
#14
Steven L Berk
The challenges of infectious diseases, including new pathogens, dangerous outbreaks, antibiotic-resistant bacteria, and the perils of international travel have never been more publically appreciated. These challenges require a well-trained workforce of infectious disease specialists. Just when the need appears to be greatest, however, the interest in infectious diseases among today's young physicians is at its lowest point.
February 1, 2017: Texas Medicine
https://www.readbyqxmd.com/read/28206871/swallowing-therapy-and-progressive-resistance-training-in-head-and-neck-cancer-patients-undergoing-radiotherapy-treatment-randomized-control-trial-protocol-and-preliminary-data
#15
Sara F Hajdú, Irene Wessel, Christoffer Johansen, Claus A Kristensen, Zahra T Kadkhoda, Christina C Plaschke, Susanne O Dalton
BACKGROUND: Head and neck cancer (HNC) patients are often challenged by treatment induced dysphagia and trismus. Traditionally, rehabilitation is initiated when loss of function has already occurred. There is increasing evidence that it is of benefit to patients to initiate an early rehabilitation process before and during treatment. HNC patients have a unique set of functional challenges such as pre- and post-treatment dysphagia, pain and weight loss. The aim of the trial is to investigate the effects of swallowing and mouth-opening exercises combined with progressive resistance training (PRT) during radiotherapy...
February 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28205203/effects-of-different-types-of-exercise-on-body-composition-muscle-strength-and-igf-1-in-the-elderly-with-sarcopenic-obesity
#16
Hung-Ting Chen, Yu-Chun Chung, Yu-Jen Chen, Sung-Yen Ho, Huey-June Wu
OBJECTIVES: To investigate the influence of resistance training (RT), aerobic training (AT), or combination training (CT) interventions on the body composition, muscle strength performance, and insulin-like growth factor 1 (IGF-1) of patients with sarcopenic obesity. DESIGN: Randomized controlled trial. SETTING: Community center and research center. PARTICIPANTS: Sixty men and women aged 65-75 with sarcopenic obesity...
February 15, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28203453/association-of-osteoprotegerin-with-obesity-insulin-resistance-and-non-alcoholic-fatty-liver-disease-in-children
#17
Meltem Erol, Ozlem Bostan Gayret, Hikmet Tekin Nacaroglu, Ozgul Yigit, Oguzhan Zengi, Mehmet Salih Akkurt, Mehmet Tasdemir
BACKGROUND: Osteoprotegerin (OPG) is a member of the tumor necrosis factor superfamily. Reduced OPG levels are related to obesity, insulin resistance, and non-alcoholic fatty liver disease (NAFLD). OBJECTIVES: The aim of this study was to evaluate the relationship between OPG levels, obesity, insulin resistance, and NAFLD in pediatric patients. METHODS: This was a prospective, cross-sectional, controlled study that was conducted in the department of pediatrics at Bagcilar training and research hospital in Istanbul, Turkey, between April and August 2015...
November 2016: Iranian Red Crescent Medical Journal
https://www.readbyqxmd.com/read/28202586/waveform-sensitivity-of-electroreceptors-in-the-pulse-weakly-electric-fish-gymnotus-omarorum
#18
Alejo Rodríguez-Cattaneo, Pedro A Aguilera, Angel A Caputi
As in most sensory systems electrosensory images in weakly electric fish are encoded in two parallel pathways, fast and slow. From the work on wave type electric fish these pathways are thought to encode the time and amplitude of electrosensory signals respectively. This article focuses on the primary afferents giving origin to the slow path of the pulse type weakly electric fish Gymnotus omarorum We found that burst duration coders respond with a high-frequency train of spikes to each electric organ discharge...
February 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28199417/physical-activity-prevents-alterations-in-mitochondrial-ultrastructure-and-glucometabolic-parameters-in-a-high-sugar-diet-model
#19
Karina Barbosa de Queiroz, Kinulpe Honorato-Sampaio, Joamyr Victor Rossoni Júnior, Diego Andrade Leal, Angélica Barbosa G Pinto, Lenice Kappes-Becker, Elisio Alberto Evangelista, Renata Guerra-Sá
Endurance exercise is a remarkable intervention for the treatment of many diseases. Mitochondrial changes on skeletal muscle are likely important for many of the benefits provided by exercise. In this study, we aimed to evaluate the effects that a regular physical activity (swimming without workload) has on mitochondrial morphological alterations and glucometabolic parameters induced by a high-sugar diet (HSD). Weaned male Wistar rats fed with a standard diet or a HSD (68% carbohydrate) were subjected to 60 minutes of regular physical activity by swimming (without workload) for four- (20 sessions) or eight-week (40 sessions) periods...
2017: PloS One
https://www.readbyqxmd.com/read/28198601/the-effect-of-high-speed-strength-training-with-heavy-and-low-workloads-on-neuromuscular-function-and-maximal-concentric-quadriceps-strength
#20
Ali A Mazani, Mohamed R Hamdinia, Amir H Haghigi, Nosratollah Hedayatpour
BACKGROUND: Dynamic strength training has been widely used to increase the ability of skeletal muscle to produce muscle force. Manipulating resistance training program variables has been commonly used as a tool to optimize maximum strength. This study examined the effects of 12 weeks of high-speed strength training with low and heavy workloads on muscle strength and neuromuscular function of quadriceps muscle. METHODS: Thirty male subjects (age, mean ± SD, 20.6 ± 2...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
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