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https://www.readbyqxmd.com/read/27913834/key-role-of-pacing-site-as-determinant-factor-of-exercise-testing-performance-in-pediatric-patients-with-chronic-ventricular-pacing
#1
Michel Cabrera Ortega, Hiram Tápanes Duamy, Dunia B Benítez Ramos
Chronic right ventricular (RV) apical pacing has been associated with deterioration of functional capacity and chronotropic incompetence during exercise testing in children. The effects of alternative pacing site on exercise performance in pediatric population remain unknown. We evaluated the influence of ventricular pacing site on exercise capacity in pediatric patients with complete congenital atrioventricular block requiring permanent pacemaker therapy. Sixty-four children paced from RV apex (n = 26), RV midseptum (n = 15) and left ventricular (LV) apex (n = 23) were studied cross-sectionally...
December 2, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27912206/irisin-lowers-blood-pressure-by-improvement-of-endothelial-dysfunction-via-ampk-akt-enos-no-pathway-in-the-spontaneously-hypertensive-rat
#2
Jinjuan Fu, Yu Han, Jialiang Wang, Yukai Liu, Shuo Zheng, Lin Zhou, Pedro A Jose, Chunyu Zeng
BACKGROUND: Exercise is a major nonpharmacological treatment for hypertension, but its underlying mechanisms are still not completely elucidated. Irisin, a polypeptide containing 112 amino acids, which is secreted mainly by skeletal muscle cells during exercise, exerts a protective role in metabolic diseases, such as diabetes mellitus and obesity. Because of the close relationship between irisin and metabolic diseases, we hypothesized that irisin may play a role in the regulation of blood pressure...
October 26, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27912156/health-benefits-of-aerobic-training-programs-in-adults-aged-70-and-over-a-systematic-review
#3
REVIEW
Walid Bouaziz, Thomas Vogel, Elise Schmitt, Georges Kaltenbach, Bernard Geny, Pierre Olivier Lang
Aging is intrinsically associated with a progressive decline in muscle strength and mass, and aerobic capacity. This contributes to reduced mobility and impaired quality of life (QoL) among seniors. Regular physical activity, and more particularly aerobic training (AT), has demonstrated benefits on adults' health. The aim of this review was to assess the current level of evidence regarding the health benefits of AT in the population aged 70 years and over. A comprehensive, systematic database search for manuscripts was performed...
October 31, 2016: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/27911483/effects-of-dietary-heme-iron-and-exercise-training-on-abdominal-fat-accumulation-and-lipid-metabolism-in-high-fat-diet-fed-mice
#4
Masanori Katsumura, Shoko Takagi, Hana Oya, Shohei Tamura, Takaoki Saneyasu, Kazuhisa Honda, Hiroshi Kamisoyama
Animal by-products can be recycled and used as sources of essential nutrients. Water-soluble heme iron (WSHI), a functional food additive for supplementing iron, is produced by processing animal blood. In this study, we investigated the effects of dietary supplementation of 3% WSHI and exercise training for 4 weeks on the accumulation of abdominal fat and lipid metabolism in mice fed high-fat diet. Exercise-trained mice had significantly less perirenal adipose tissue, whereas WSHI-fed mice tended to have less epididymal adipose tissue...
December 2, 2016: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/27909231/influence-of-dietary-nitrate-supplementation-on-physiological-and-muscle-metabolic-adaptations-to-sprint-interval-training
#5
Christopher Thompson, Lee J Wylie, Jamie R Blackwell, Jonathan Fulford, Matthew I Black, James Kelly, Sinead T J McDonagh, James Carter, Stephen J Bailey, Anni Vanhatalo, Andrew M Jones
We hypothesized that 4 weeks of dietary nitrate supplementation would enhance exercise performance and muscle metabolic adaptations to sprint interval training (SIT). Thirty six recreationally-active subjects, matched on key variables at baseline, completed a series of exercise tests before and following a 4 week period in which they were allocated to one of the following groups: 1) SIT and NO3(-)-depleted beetroot juice as a placebo (SIT+PL); 2) SIT and NO3(-)-rich beetroot juice (~13mmol NO3(-)/day; SIT+BR); or 3) no training and NO3(-)-rich beetroot juice (NT+BR)...
December 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27908782/adaptive-responses-of-neuronal-mitochondria-to-bioenergetic-challenges-roles-in-neuroplasticity-and-disease-resistance
#6
REVIEW
Sophia M Raefsky, Mark P Mattson
An important concept in neurobiology is "neurons that fire together, wire together" which means that the formation and maintenance of synapses is promoted by activation of those synapses. Very similar to the effects of the stress of exercise on muscle cells, emerging findings suggest that neurons respond to activity by activating signaling pathways (e.g., Ca(2+), CREB, PGC-1α, NF-κB) that stimulate mitochondrial biogenesis and cellular stress resistance. These pathways are also activated by aerobic exercise and food deprivation, two bioenergetic challenges of fundamental importance in the evolution of the brains of all mammals, including humans...
November 28, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27908291/muscle-pgc-1%C3%AE-modulates-satellite-cell-number-and-proliferation-by-remodeling-the-stem-cell-niche
#7
Ivana Dinulovic, Regula Furrer, Markus Beer, Arnaud Ferry, Bettina Cardel, Christoph Handschin
BACKGROUND: The myogenic capacity of satellite cells (SCs), adult muscle stem cells, is influenced by aging, exercise, and other factors. In skeletal muscle, the peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) is a key regulator of oxidative metabolism and endurance training adaptation. However, a link between PGC-1α and SC behavior remains unexplored. METHODS: We have now studied SC function in a PGC-1α fiber-specific gain-of-function animal model...
December 2, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27905297/altered-thermoregulatory-responses-in-heart-failure-patients-exercising-in-the-heat
#8
Bryce N Balmain, Ollie Jay, Surendran Sabapathy, Danielle Royston, Glenn M Stewart, Rohan Jayasinghe, Norman R Morris
Heart failure (HF) patients appear to exhibit impaired thermoregulatory capacity during passive heating, as evidenced by diminished vascular conductance. Although some preliminary studies have described the thermoregulatory response to passive heating in HF, responses during exercise in the heat remain to be described. Therefore, the aim of this study was to compare thermoregulatory responses in HF and controls (CON) during exercise in the heat. Ten HF (NYHA classes I-II) and eight CON were included. Core temperature (Tc), skin temperature (Tsk), and cutaneous vascular conductance (CVC) were assessed at rest and during 1 h of exercise at 60% of maximal oxygen uptake...
November 2016: Physiological Reports
https://www.readbyqxmd.com/read/27905293/long-term-exercise-in-mice-has-sex-dependent-benefits-on-body-composition-and-metabolism-during-aging
#9
Rachel C McMullan, Scott A Kelly, Kunjie Hua, Brian K Buckley, James E Faber, Fernando Pardo-Manuel de Villena, Daniel Pomp
Aging is associated with declining exercise and unhealthy changes in body composition. Exercise ameliorates certain adverse age-related physiological changes and protects against many chronic diseases. Despite these benefits, willingness to exercise and physiological responses to exercise vary widely, and long-term exercise and its benefits are difficult and costly to measure in humans. Furthermore, physiological effects of aging in humans are confounded with changes in lifestyle and environment. We used C57BL/6J mice to examine long-term patterns of exercise during aging and its physiological effects in a well-controlled environment...
November 2016: Physiological Reports
https://www.readbyqxmd.com/read/27904925/breaking-sitting-with-light-activities-vs-structured-exercise-a-randomised-crossover-study-demonstrating-benefits-for-glycaemic-control-and-insulin-sensitivity-in-type-2-diabetes
#10
Bernard M F M Duvivier, Nicolaas C Schaper, Matthijs K C Hesselink, Linh van Kan, Nathalie Stienen, Bjorn Winkens, Annemarie Koster, Hans H C M Savelberg
AIMS/HYPOTHESIS: We aimed to examine the effects of breaking sitting with standing and light-intensity walking vs an energy-matched bout of structured exercise on 24 h glucose levels and insulin resistance in patients with type 2 diabetes. METHODS: In a randomised crossover study, 19 patients with type 2 diabetes (13 men/6 women, 63 ± 9 years old) who were not using insulin each followed three regimens under free-living conditions, each lasting 4 days: (1) Sitting: 4415 steps/day with 14 h sitting/day; (2) Exercise: 4823 steps/day with 1...
December 1, 2016: Diabetologia
https://www.readbyqxmd.com/read/27903669/exertional-dyspnoea-in-obesity
#11
Vipa Bernhardt, Tony G Babb
The purpose of cardiopulmonary exercise testing (CPET) in the obese person, as in any cardiopulmonary exercise test, is to determine the patient's exercise tolerance, and to help identify and/or distinguish between the various physiological factors that could contribute to exercise intolerance. Unexplained dyspnoea on exertion is a common reason for CPET, but it is an extremely complex symptom to explain. Sometimes obesity is the simple answer by elimination of other possibilities. Thus, distinguishing among multiple clinical causes for exertional dyspnoea depends on the ability to eliminate possibilities while recognising response patterns that are unique to the obese patient...
December 2016: European Respiratory Review: An Official Journal of the European Respiratory Society
https://www.readbyqxmd.com/read/27903627/the-role-of-the-antioxidant-system-during-intense-endurance-exercise-lessons-from-migrating-birds
#12
REVIEW
Clara Cooper-Mullin, Scott R McWilliams
During migration, birds substantially increase their metabolic rate and burn fats as fuel and yet somehow avoid succumbing to overwhelming oxidative damage. The physiological means by which vertebrates such as migrating birds can counteract an increased production of reactive species (RS) are rather limited: they can upregulate their endogenous antioxidant system and/or consume dietary antioxidants (prophylactically or therapeutically). Thus, birds can alter different components of their antioxidant system to respond to the demands of long-duration flights, but much remains to be discovered about the complexities of RS production and antioxidant protection throughout migration...
December 1, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27903152/obesity-and-cancer-mechanisms-cancer-metabolism
#13
Benjamin D Hopkins, Marcus D Goncalves, Lewis C Cantley
Obesity is a risk factor for cancer development and is associated with poor prognosis in multiple tumor types. The positive energy balance linked with obesity induces a variety of systemic changes including altered levels of insulin, insulin-like growth factor-1, leptin, adiponectin, steroid hormones, and cytokines. Each of these factors alters the nutritional milieu and has the potential to create an environment that favors tumor initiation and progression. Although the complete ramifications of obesity as it relates to cancer are still unclear, there is convincing evidence that reducing the magnitude of the systemic hormonal and inflammatory changes has significant clinical benefits...
December 10, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/27903048/resistance-exercise-induced-rhabdomyolysis-need-for-immediate-intervention-and-proper-counselling
#14
Maysaa A Khalil, Basem R Saab
BACKGROUND: Rhabdomyolysis results from damage to skeletal muscle. Improper resistance training may result in rhabdomyolysis, which can cause acute kidney injury, serious metabolic abnormalities, compartmental syndrome and even death. Proper counselling for athletes may prevent this condition. OBJECTIVE: We present two patients with unilateral swelling after resistance exercise. The workup revealed rhabdomyolysis. We highlight the importance of counselling to prevent rhabdomyolysis secondary to resistance exercise...
December 2016: Australian Family Physician
https://www.readbyqxmd.com/read/27901037/control-of-energy-expenditure-in-humans
#15
REVIEW
K R Westerterp
Energy expenditure is determined by body size and body composition and by food intake and physical activity. Body size and body composition are the determinants of resting energy expenditure. Higher weight results in higher energy requirement through a higher resting requirement because of a higher maintenance cost of a larger body. Activity-induced energy expenditure is the most variable component of total energy expenditure. Smaller and leaner subjects generally move more as activity energy expenditure in larger subjects is not higher in proportion to the cost of moving with a higher body weight...
November 30, 2016: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27900260/gut-microbiota-and-glucometabolic-alterations-in-response-to-recurrent-partial-sleep-deprivation-in-normal-weight-young-individuals
#16
Christian Benedict, Heike Vogel, Wenke Jonas, Anni Woting, Michael Blaut, Annette Schürmann, Jonathan Cedernaes
OBJECTIVE: Changes to the microbial community in the human gut have been proposed to promote metabolic disturbances that also occur after short periods of sleep loss (including insulin resistance). However, whether sleep loss affects the gut microbiota remains unknown. METHODS: In a randomized within-subject crossover study utilizing a standardized in-lab protocol (with fixed meal times and exercise schedules), we studied nine normal-weight men at two occasions: after two nights of partial sleep deprivation (PSD; sleep opportunity 02:45-07:00 h), and after two nights of normal sleep (NS; sleep opportunity 22:30-07:00 h)...
December 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27900150/sex-differences-in-the-effects-of-12%C3%A2-weeks-sprint-interval-training-on-body-fat-mass-and-the-rates-of-fatty-acid-oxidation-and-vo2max-during-exercise
#17
Liam Bagley, Mark Slevin, Steven Bradburn, Donghui Liu, Chris Murgatroyd, George Morrissey, Michael Carroll, Mathew Piasecki, William S Gilmore, Jamie S McPhee
BACKGROUND: The purpose of this study was to examine whether very short duration, very high intensity sprint interval training (SIT) leads to loss of body fat mass in association with improvements to VO2max and fatty acid oxidation, and to assess the extent of sex dimorphism in these physiological responses. METHODS: A total of 24 men and 17 women (mean (SEM) age: 39 (±2) years; body mass index 24.6 (0.6)) completed measurements of the maximal rate of oxygen uptake (VO2max) and fatty acid oxidation (FATmax)...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27900071/association-between-leukocyte-mitochondrial-dna-copy-number-and-regular-exercise-in-postmenopausal-women
#18
Yu Kyung Chang, Da Eun Kim, Soo Hyun Cho, Jung-Ha Kim
BACKGROUND: Previous studies suggest that habitual exercise can improve skeletal mitochondrial function; however, to date, the association between exercise and mitochondrial function in peripheral leukocytes has not been reported. The aim of this study was to evaluate the relationship between regular exercise and mitochondrial function by measuring leukocyte mitochondrial DNA (mtDNA) copy number in postmenopausal women. METHODS: This cross-sectional study included 144 relatively healthy, non-diabetic, non-smoking, postmenopausal women...
November 2016: Korean Journal of Family Medicine
https://www.readbyqxmd.com/read/27898185/perfusion-has-no-effect-on-the-in-vivo-cest-effect-from-cr-crcest-in-skeletal-muscle
#19
Feliks Kogan, Randall B Stafford, Erin K Englund, Garry E Gold, Hari Hariharan, John A Detre, Ravinder Reddy
Creatine, a key component of muscle energy metabolism, exhibits a chemical exchange saturation transfer (CEST) effect between its amine group and bulk water, which has been exploited to spatially and temporally map creatine changes in skeletal muscle before and after exercise. In addition, exercise leads to an increase in muscle perfusion. In this work, we determined the effects of perfused blood on the CEST effects from creatine in skeletal muscle. Experiments were performed on healthy human subjects (n = 5) on a whole-body Siemens 7T magnetic resonance imaging (MRI) scanner with a 28-channel radiofrequency (RF) coil...
November 29, 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/27897989/periodization-of-carbohydrate-intake-short-term-effect-on-performance
#20
Laurie-Anne Marquet, Christophe Hausswirth, Odeline Molle, John A Hawley, Louise M Burke, Eve Tiollier, Jeanick Brisswalter
BACKGROUND: "Sleep-low" consists of a sequential periodization of carbohydrate (CHO) availability-low glycogen recovery after "train high" glycogen-depleting interval training, followed by an overnight-fast and light intensity training ("train low") the following day. This strategy leads to an upregulation of several exercise-responsive signaling proteins, but the chronic effect on performance has received less attention. We investigated the effects of short-term exposure to this strategy on endurance performance...
November 25, 2016: Nutrients
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