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Exercise physiology

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https://www.readbyqxmd.com/read/28934805/ratings-of-perceived-exertion-and-physiological-responses-in-children-during-exercise
#1
Jennifer M Erichsen, Brandon J Dykstra, Mary C Hidde, Anthony D Mahon
OMNI ratings of perceived exertion (RPE) and physiological responses in children (n=7 boys, 8 girls, 11.1±1.0 years) were examined during estimation (graded exercise test [GXT] and steady-state) and production (steady-state) trials on a cycle ergometer. Peak oxygen consumption (VO2peak) was determined via a GXT with RPE estimated every 30 s. Later, two 6-min trials were completed: Participants 1) estimated RPE at ~75% of VO2peak, 2) produced a level of exertion corresponding to their RPE at ~75% of VO2peak during the GXT...
September 21, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28933745/effects-of-six-week-ginkgo-biloba-supplementation-on-aerobic-performance-blood-pro-antioxidant-balance-and-serum-brain-derived-neurotrophic-factor-in-physically-active-men
#2
Ewa Sadowska-Krępa, Barbara Kłapcińska, Ilona Pokora, Przemysław Domaszewski, Katarzyna Kempa, Tomasz Podgórski
Extracts of Ginkgo biloba leaves, a natural source of flavonoids and polyphenolic compounds, are commonly used as therapeutic agents for the improvement of both cognitive and physiological performance. The present study was aimed to test the effects of a six-week supplementation with 160 mg/day of a standardized extract of Ginkgo biloba or a matching placebo on aerobic performance, blood antioxidant capacity, and brain-derived neurotrophic factor (BDNF) level in healthy, physically active young men, randomly allocated to two groups (n = 9 each)...
July 26, 2017: Nutrients
https://www.readbyqxmd.com/read/28933362/male-infertility-the-effect-of-natural-antioxidants-and-phytocompounds-on-seminal-oxidative-stress
#3
REVIEW
Malik Adewoyin, Muhammad Ibrahim, Ramli Roszaman, Muhammad Lokman Md Isa, Nur Aizura Mat Alewi, Ainin Azwani Abdul Rafa, Mohd Nur Nasyriq Anuar
Defective sperm function has been identified as the most common cause of infertility. The objective of this study was to review recent findings on the effects of various antioxidants on male fertility. High amounts of poly unsaturated fatty acid are found in the mammalian spermatozoa membranes, thereby making them susceptible to lipid peroxidation. Although, free radicals and reactive oxygen species (ROS) play major roles in reproduction, they are strongly associated with oxidative stress. Furthermore, factors such as obesity, inflammation, pollutants and cigarette smoking are negatively correlated with spermatogenesis...
March 1, 2017: Diseases (Basel)
https://www.readbyqxmd.com/read/28930879/repeat-effort-performance-is-reduced-24-h-following-acute-dehydration-in-mixed-martial-arts-athletes
#4
Oliver R Barley, Fiona Iredale, Dale W Chapman, Amanda Hopper, Chris Abbiss
This study sought to determine the influence of acute dehydration on physical performance and physiology in Mixed Martial Arts (MMA). MMA athletes (n=14; age: 23±4 years), completed in a randomised counterbalanced order a dehydration protocol, (DHY: 3 h cycling at 60 W in 40°C to induce 5% dehydration) or thermoneutral control (25°C: CONT) exercise, followed by ad libitum fluid/food intake. Performance testing (a repeat sled push test, medicine ball chest throw and vertical jump) was completed 3 and 24 h following the intervention, while urine and blood samples were collected before, 20 min, 3 and 24 h following the intervention...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28929343/a-comparison-of-isomaltulose-versus-maltodextrin-ingestion-during-soccer-specific-exercise
#5
Emma J Stevenson, Anthony Watson, Stephan Theis, Anja Holz, Liam D Harper, Mark Russell
PURPOSE: The performance and physiological effects of isomaltulose and maltodextrin consumed intermittently during prolonged soccer-specific exercise were investigated. METHODS: University soccer players (n = 22) performed 120 min of intermittent exercise while consuming 8% carbohydrate-electrolyte drinks (equivalent to ~ 20 g h(-1)) containing maltodextrin (Glycaemic Index: 90-100), isomaltulose (Glycaemic Index: 32) or a carbohydrate-energy-free placebo in a manner replicating the practices of soccer players (i...
September 19, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28928069/comments-on-the-new-international-criteria-for-electrocardiographic-interpretation-in-athletes
#6
Luis Serratosa-Fernández, Domingo Pascual-Figal, María Dolores Masiá-Mondéjar, María Sanz-de la Garza, Zigor Madaria-Marijuan, Juan Ramón Gimeno-Blanes, Carmen Adamuz
Sudden cardiac death is the most common medical cause of death during the practice of sports. Several structural and electrical cardiac conditions are associated with sudden cardiac death in athletes, most of them showing abnormal findings on resting electrocardiogram (ECG). However, because of the similarity between some ECG findings associated with physiological adaptations to exercise training and those of certain cardiac conditions, ECG interpretation in athletes is often challenging. Other factors related to ECG findings are race, age, sex, sports discipline, training intensity, and athletic background...
September 16, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28927254/integrated-analysis-of-microrna-and-mrna-expression-in-peripheral-blood-leukocytes-of-warmblood-horses-before-and-after-exercise
#7
Hang-Ah Kim, Myung-Chul Kim, Na-Yon Kim, Doug-Young Ryu, Hong-Seok Lee, Yongbaek Kim
Exercise capacity is a valuable trait in horses, and it has been used as one of their selection criteria. Although exercise affects molecular homeostasis and adaptation in horses, the mechanisms underlying these effects are not fully understood. This study was carried out to identify changes in the blood profiles of microRNAs (miRNAs) and mRNAs induced by exercise in horse leukocytes. Total RNAs isolated from the peripheral blood leukocytes of four Warmblood horses before and after exercise were subjected to next-generation sequencing (NGS) and microarray analyses to determine the miRNA and mRNA expression profiles, respectively...
September 20, 2017: Journal of Veterinary Science
https://www.readbyqxmd.com/read/28925073/role-of-cardiopulmonary-exercise-testing-in-clinical-stratification-in-heart-failure-a-position-paper-from-the-committee-on-exercise-physiology-and-training-of-the-heart-failure-association-of-the-european-society-of-cardiology
#8
REVIEW
Ugo Corrà, Pier Giuseppe Agostoni, Stefan D Anker, Andrew J S Coats, Maria G Crespo Leiro, Rudolph A de Boer, Veli-Pekka Hairola, Loreena Hill, Mitja Lainscak, Lars H Lund, Marco Metra, Piotr Ponikowski, Jillian Riley, Petar M Seferović, Massimo F Piepoli
Traditionally, the main indication for cardiopulmonary exercise testing (CPET) in heart failure (HF) was for the selection of candidates to heart transplantation: CPET was mainly performed in middle-aged male patients with HF and reduced left ventricular ejection fraction. Today, CPET is used in broader patients' populations, including women, elderly, patients with co-morbidities, those with preserved ejection fraction, or left ventricular assistance device recipients, i.e. individuals with different responses to incremental exercise and markedly different prognosis...
September 18, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28922936/the-effects-of-worry-and-relaxation-on-flexibility-during-cognitive-restructuring
#9
Elizabeth S Stevens, Alexander A Jendrusina, Alison C Legrand, Erica R Nahin, Michelle Goldwin Kaufman, Thomas D Borkovec, Evelyn Behar
Worry is associated with inflexibility in cognitive, emotional, and physiological functioning. In addition, worry's negative valence and abstract level of construal are rigid characteristics that contribute to its nonadaptive consequences. Relaxation and cognitive therapy aim to increase flexibility in chronic worriers, and may have greater efficacy when administered in combination. We examined the extent to which relaxation enhances and/or worry inhibits cognitive flexibility during a cognitive restructuring exercise in which participants generated alternative predictions for their worries...
September 1, 2017: Behavior Modification
https://www.readbyqxmd.com/read/28919728/chronic-obstructive-pulmonary-disease-with-mild-airflow-limitation-current-knowledge-and-proposal-for-future-research-a-consensus-document-from-six-scientific-societies
#10
REVIEW
Andrea Rossi, Bojana Butorac-Petanjek, Marco Chilosi, Borja G Cosío, Matjaz Flezar, Nikolaos Koulouris, José Marin, Neven Miculinic, Guido Polese, Miroslav Samaržija, Sabina Skrgat, Theodoros Vassilakopoulos, Andrea Vukić-Dugac, Spyridon Zakynthinos, Marc Miravitlles
Chronic obstructive pulmonary disease (COPD) is a leading cause of mortality and morbidity worldwide, with high and growing prevalence. Its underdiagnosis and hence under-treatment is a general feature across all countries. This is particularly true for the mild or early stages of the disease, when symptoms do not yet interfere with daily living activities and both patients and doctors are likely to underestimate the presence of the disease. A diagnosis of COPD requires spirometry in subjects with a history of exposure to known risk factors and symptoms...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28919370/with-age-a-lower-individual-breathing-reserve-is-associated-with-a-higher-maximal-heart-rate
#11
Martin Burtscher, Hannes Gatterer, Martin Faulhaber, Johannes Burtscher
INTRODUCTION: Maximal heart rate (HRmax) is linearly declining with increasing age. Regular exercise training is supposed to partly prevent this decline, whereas sex and habitual physical activity do not. High exercise capacity is associated with a high cardiac output (HR x stroke volume) and high ventilatory requirements. Due to the close cardiorespiratory coupling, we hypothesized that the individual ventilatory response to maximal exercise might be associated with the age-related HRmax...
September 14, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28919335/the-effect-of-resistance-exercise-on-sleep-a-systematic-review-of-randomized-controlled-trials
#12
REVIEW
Ana Kovacevic, Yorgi Mavros, Jennifer J Heisz, Maria A Fiatarone Singh
Impaired sleep quality and quantity are associated with future morbidity and mortality. Exercise may be an effective non-pharmacological intervention to improve sleep, however, little is known on the effect of resistance exercise. Thus, we performed a systematic review of the literature to determine the acute and chronic effects of resistance exercise on sleep quantity and quality. Thirteen studies were included. Chronic resistance exercise improves all aspects of sleep, with the greatest benefit for sleep quality...
July 19, 2017: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/28918861/exercise-self-efficacy-correlates-in-people-with-psychosis
#13
Davy Vancampfort, Paul Gorczynski, Marc De Hert, Michel Probst, Annetie Naisiga, David Basangwa, James Mugisha
Despite the recognition of the importance of exercise self-efficacy in exercise adoption and maintenance, previous investigations on exercise self-efficacy in people with psychosis is scarce. The present study aimed to (1) explore if exercise self-efficacy differed between stages of behavior change in Ugandan outpatients with psychosis, and (2) assess sociodemographic, clinical and motivational correlates of exercise self-efficacy. In total, 48 patients (24 women) completed the Exercise Self-Efficacy Scale (ESES), the Patient-centered Assessment and Counseling for Exercise questionnaire, the Brief Symptoms Inventory-18 (BSI-18), and questions pertaining to intrinsic motivation in the Behavioral Regulation in Exercise Questionnaire-2...
September 8, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28918494/betaine-in-the-brain-characterization-of-betaine-uptake-its-influence-on-other-osmolytes-and-its-potential-role-in-neuroprotection-from-osmotic-stress
#14
Leena S Knight, Quinn Piibe, Ian Lambie, Christopher Perkins, Paul H Yancey
Betaine (N-trimethylglycine), a common osmolyte, has received attention because of the number of clinical reports associating betaine supplementation with improved cognition, neuroprotection and exercise physiology. However, tissue analyses report little accumulation of betaine in brain tissue despite the presence of betaine/GABA transporters (BGT1) at the blood brain barrier and in nervous tissue, calling into question whether betaine influences neuronal function directly or indirectly. Therefore, the focus of this study was to determine what capacity nervous tissue has to accumulate betaine, specifically in the hippocampus, a region of the brain associated with learning and memory and one that is particularly susceptible to damage (e...
September 16, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28918314/empirical-research-evaluating-the-effects-of-non-traditional-approaches-to-enhancing-sleep-in-typical-and-clinical-children-and%C3%A2-young-people
#15
REVIEW
Karyn G France, Laurie K McLay, Jolene E Hunter, Madeline L S France
This paper examines the effects of non-traditional (non-behavioural and non-prescription pharmaceutical) approaches to sleep in children and young people (0-18 y). A systematic search identified 79 studies that met inclusion criteria. Seventeen percent of the studies were rated as having a conclusive level of evidence, forty-two percent with preponderant evidence and forty-one percent with only suggestive evidence. There were promising indications, with certain populations only, for aromatherapy, ketogenic diets, an elimination diet (few foods diet), elimination of cow's milk, avoidance of caffeine, tryptophan with adenosine and uridine, omega-3 and omega-6, valerian, music, osteopathic manipulation and white noise...
July 29, 2017: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/28915945/potentiometric-sensor-for-non-invasive-lactate-determination-in-human-sweat
#16
Massimo Onor, Stefano Gufoni, Tommaso Lomonaco, Silvia Ghimenti, Pietro Salvo, Fiodor Sorrentino, Emilia Bramanti
The present work describes a non invasive lactate sensing in sweat during workout. The sensing system is based on a non-equilibrium potentiometric measure performed using disposable, chemically modified, screen printed carbon electrodes (SPCEs) that can be wetted with sweat during the exercise. The potentiometric signal, which is proportional to lactate concentration in sweat, is produced by a redox reaction activated by UV radiation, as opposed to the enzymatic reaction employed in traditional, blood-based measuring devices...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28914815/a-systematic-review-family-support-integrated-with-diabetes-self-management-among-uncontrolled-type-ii-diabetes-mellitus-patients
#17
REVIEW
Rian Adi Pamungkas, Kanittha Chamroonsawasdi, Paranee Vatanasomboon
The rate of type-2 diabetes mellitus (T2D) is dramatically increasing worldwide. Continuing diabetes mellitus (DM) care needs effective self-management education and support for both patients and family members. This study aimed to review and describe the impacts of diabetes mellitus self-management education (DSME) that involve family members on patient outcomes related to patient health behaviors and perceived self-efficacy on self-management such as medication adherence, blood glucose monitoring, diet and exercise changes, health outcomes including psychological well-being and self-efficacy, and physiological markers including body mass index, level of blood pressure, cholesterol level and glycemic control...
September 15, 2017: Behavioral Sciences
https://www.readbyqxmd.com/read/28913725/exercise-and-competitive-sport-physiology-adaptations-and-uncertain-long-term-risks
#18
REVIEW
Patrick T Gleason, Jonathan H Kim
The benefits of regular and moderate exercise training on cardiovascular outcomes have been well established. In addition, strenuous exercise training leads to corollary cardiac structural and functional adaptations that are sport-specific and facilitate athletic performance. In this review, the normal physiologic and hemodynamic changes that occur during exercise and the subsequent differential exercise-induced cardiac remodeling patterns that develop will be discussed. Paradoxically, recent data have raised concern about the long-term impact of higher doses of physical activity and exercise on mortality and cardiovascular health outcomes...
September 14, 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28912742/perception-action-and-cognition-of-football-referees-in-extreme-temperatures-impact-on-decision-performance
#19
Nadia Gaoua, Rita F de Oliveira, Steve Hunter
Different professional domains require high levels of physical performance alongside fast and accurate decision-making. Construction workers, police officers, firefighters, elite sports men and women, the military and emergency medical professionals are often exposed to hostile environments with limited options for behavioral coping strategies. In this (mini) review we use football refereeing as an example to discuss the combined effect of intense physical activity and extreme temperatures on decision-making and suggest an explicative model...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28912655/chronic-eccentric-exercise-and-antioxidant-supplementation-effects-on-lipid-profile-and-insulin-sensitivity
#20
Christina Yfanti, Athanasios Tsiokanos, Ioannis G Fatouros, Anastasios A Theodorou, Chariklia K Deli, Yiannis Koutedakis, Athanasios Z Jamurtas
Eccentric exercise has been shown to exert beneficial effects in both lipid profile and insulin sensitivity. Antioxidant supplementation during chronic exercise is controversial as it may prevent the physiological training-induced adaptations. The aim of this study was to investigate: 1) the minimum duration of the eccentric exercise training required before changes on metabolic parameters are observed and 2) whether antioxidant supplementation during training would interfere with these adaptations. Sixteen young healthy men were randomized into the Vit group (1 g of vitamin C and 400 IU vitamin E daily) and the placebo (PL) group...
September 2017: Journal of Sports Science & Medicine
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