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https://www.readbyqxmd.com/read/29687909/breath-hold-diving
#1
John R Fitz-Clarke
Breath-hold diving is practiced by recreational divers, seafood divers, military divers, and competitive athletes. It involves highly integrated physiology and extreme responses. This article reviews human breath-hold diving physiology beginning with an historical overview followed by a summary of foundational research and a survey of some contemporary issues. Immersion and cardiovascular adjustments promote a blood shift into the heart and chest vasculature. Autonomic responses include diving bradycardia, peripheral vasoconstriction, and splenic contraction, which help conserve oxygen...
March 25, 2018: Comprehensive Physiology
https://www.readbyqxmd.com/read/29687691/side-effects-of-anabolic-steroids-used-by-athletes-at-unaizah-gyms-saudi-arabia-a-pilot-study
#2
Amer A Almaiman, Sulaiman H Almaiman, Elsayed I Elagamy, Osama Al Wutayd, Mohammed Almarzuqi, Rayyan Alzunaidi, Sami Alhatlani, Eltayeb E Eid
BACKGROUND: A large number of Saudi athletes are recently shown to use androgenic anabolic steroid (AAS) products to achieve rapid muscle growth without realizing the serious health risks of these drugs. Aim of this study was to elucidate the side effects encountered with prolonged use of AAS products by Saudi athletes. METHODS: A cross-sectional study was conducted, in which 16 regular gym members, 12 of them used AAS, were asked to answer a questionnaire and provide blood samples following current AAS course completion...
April 20, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29686813/resting-sympatho-vagal-balance-is-related-to-10-km-running-performance-in-master-endurance-athletes
#3
Angelo Cataldo, Antonino Bianco, Antonio Paoli, Dario Cerasola, Saverio Alagna, Giuseppe Messina, Daniele Zangla, Marcello Traina
Relationships between heart rate recovery after exercise (HRR, baseline heart rate variability measures (HRV), and time to perform a 10Km running trial (t10Km) were evaluated in "master" athletes of endurance to assess whether the measured indexes may be useful for monitoring the training status of the athletes. Ten "master" athletes of endurance, aged 40-60 years, were recruited. After baseline measures of HRV, the athletes performed a graded maximal test on treadmill and HRR was measured at 1 and 2 minutes from recovery...
January 12, 2018: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29679415/elite-swimmers-internal-markers-trajectories-in-ecological-training-conditions
#4
Philippe Vacher, Guillaume Martinent, Laurent Mourot, Michel Nicolas
PURPOSE: This study examined the trajectories of elite swimmers' recovery-stress states and cardiac vagal-related markers during a three-month training period preceding the national championship and their within-person relationships with perceived control. METHODS: A Multilevel Growth Curve Analysis (MGCA) approach was used with 21 male elite swimmers. Four waves of assessments of psychological (stress, recovery, perceived control) and physiological (heart rate variability, HRV) markers were completed during a three-month training preparation leading to a major competition...
April 21, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29671875/atrial-remodeling-and-ectopic-burden-in-recreational-athletes-implications-for-risk-of-atrial-fibrillation
#5
Adrian D Elliott, Rajiv Mahajan, Dominik Linz, Michael Stokes, Christian V Verdicchio, Melissa E Middeldorp, Andre La Gerche, Dennis H Lau, Prashanthan Sanders
BACKGROUND: Atrial remodeling, vagal tone and atrial ectopic triggers have been suggested to contribute to the increased incidence of atrial fibrillation (AF) in endurance athletes. How these parameters change with increased lifetime training hours is debated. HYPOTHESIS: We hypothesised that atrial remodeling occurs in proportion to total training history, thus contributing to the elevated risk of AF. METHODS: We recruited 99 recreational endurance athletes, subsequently grouped according to lifetime training hours, to undergo evaluation of atrial size, autonomic modulation and atrial ectopy...
April 19, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29667851/athlete-s-heart-in-kids-a-word-of-caution
#6
Andreas Hoffmann
No abstract text is available yet for this article.
January 1, 2018: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/29650310/electronic-health-record-with-computerized-decision-support-tools-for-the-purposes-of-a-pediatric-cardiovascular-heart-disease-screening-program-in-crete
#7
Ilias Chatzakis, Kostas Vassilakis, Christos Lionis, Ioannis Germanakis
BACKGROUND AND OBJECTIVE: Early detection of cardiovascular (CV) disease or associated risk factors during childhood is of paramount importance, allowing for early treatment or lifestyle modifications, respectively. The objective of this study was to describe the development of an electronic health record (EHR), with integrated computerized decision support system (CDSS), specifically designed for supporting the needs of a pilot pediatric CV disease screening program applied on primary school students of a Mediterranean island...
June 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29622970/sudden-cardiac-death-with-triple-pathologies-a-case-report
#8
R Razuin, F Nurquin, M N Shahidan, M N Julina
Sudden cardiac death in young adults may be associated with rare cardiomyopathies such as left ventricular noncompaction (LVNC) and arrhythmogenic right ventricular (ARVC) cardiomyopathies. LVNC is characterised by hypertrabeculations and deep recesses of the left ventricle. ARVC presents with thin myocardium as a result of extensive fibro-fatty infiltrations. In both conditions, death may be due to arrhythmia, thromboembolic events or heart failure. We report a case of a 21-year old athletic young man who collapsed at the futsal court right after the game...
June 2017: Egypt Heart J
https://www.readbyqxmd.com/read/29621810/-secondary-full-title-effects-of-high-intensity-interval-training-in-plain-and-uphill-regarding-physical-performance
#9
Natalie Marterer, Verena Menz, Martin Burtscher
BACKGROUND:  As the number of HIITs is increasing in competitive and non-competitive sports, the risk of injuries and overload is increasing. There are no scientific data to support specific recommendations in regard to intensity, duration, number of intervals and gradient for HIIT that result in improved muscular parameters in athletes. Therefore the aim of this study was to compare HIIT in plain and uphill exercise, with respect to exercise tolerance and improvements in performance (VO2max and 800 m running time in the plain and uphill)...
April 5, 2018: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/29621050/sudden-cardiac-death-in-hypertrophic-cardiomyopathy
#10
Daria M Adamczak, Zofia Oko-Sarnowska
Hypertrophic cardiomyopathy (HCM) is a heart disease characterized by hypertrophy of the left ventricular myocardium and is most often caused by mutations in sarcomere genes. The structural and functional abnormalities are not explained by flow-limiting coronary artery disease or loading conditions. The disease affects at least 0.2% of the population worldwide and is the most common cause of sudden cardiac death in young people and competitive athletes because of fatal ventricular arrhythmia. In some patients, however, HCM has a benign course...
May 2018: Cardiology in Review
https://www.readbyqxmd.com/read/29605837/pathophysiology-of-noncardiac-syncope-in-athletes
#11
REVIEW
Georgios A Christou, Konstantinos A Christou, Dimitrios N Kiortsis
The most frequent cause of syncope in young athletes is noncardiac etiology. The mechanism of noncardiac syncope (NCS) in young athletes is neurally-mediated (reflex). NCS in athletes usually occurs either as orthostasis-induced, due to a gravity-mediated reduced venous return to the heart, or in the context of exercise. Exercise-related NCS typically occurs after the cessation of an exercise bout, while syncope occurring during exercise is highly indicative of the existence of a cardiac disorder. Postexercise NCS appears to result from hypotension due to impaired postexercise vasoconstriction, as well as from hypocapnia...
March 31, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29599872/responsiveness-of-the-countermovement-jump-and-handgrip-strength-to-an-incremental-running-test-in-endurance-athletes-influence-of-sex
#12
Felipe García-Pinillos, Pedro Delgado-Floody, Cristian Martínez-Salazar, Pedro Á Latorre-Román
The present study analyzed the acute effects of an incremental running test on countermovement jump (CMJ) and handgrip strength performance in endurance athletes, considering the effect of post-exercise recovery time and sex. Thirty-three recreationally trained long-distance runners, 20 men and 13 women, participated voluntarily in this study. The participants performed the Léger test, moreover, the CMJ and handgrip strength tests were carried out before and after the running test and during different stages of recovery (at the 1st min of recovery (posttest1), 5th min of recovery (posttest2), and 10th min of recovery (posttest3))...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599870/effect-of-two-different-types-of-olympic-rotation-order-on-cardiovascular-and-metabolic-variables-in-men-s-artistic-gymnastics
#13
Bessem Mkaouer, Monèm Jemni, Helmi Chaabene, Samiha Amara, Ahmad Njah, Mokhtar Chtara
The rotation sequence-order differs from a gymnast to another according to the draw at the time of the qualifying competitions in men's artistic gymnastics. Only the six best gymnasts start on the floor exercises, the others could start on any of the other five apparatuses. It has been demonstrated that some gymnastics events are physiologically less taxing than others; hence some gymnasts could experience lower and/or higher levels of cardiovascular and metabolic stress compared to others, depending on the apparatus they start with...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29590340/exercise-cardiac-magnetic-resonance-to-differentiate-athlete-s-heart-from-structural-heart-disease
#14
Guido Claessen, Frédéric Schnell, Jan Bogaert, Mathias Claeys, Nele Pattyn, Frederik De Buck, Steven Dymarkowski, Piet Claus, Francois Carré, Johan Van Cleemput, Andre La Gerche, Hein Heidbuchel
Aims: The distinction between left ventricular (LV) dilation with mildly reduced LV ejection fraction (EF) in response to regular endurance exercise training and an early cardiomyopathy is a frequently encountered and difficult clinical conundrum. We hypothesized that exercise rather than resting measures would provide better discrimination between physiological and pathological LV remodelling and that preserved exercise capacity does not exclude significant LV damage. Methods and results: We prospectively included 19 subjects with LVEF between 40 and 52%, comprising 10 ostensibly healthy endurance athletes (EA-healthy) and nine patients with dilated cardiomyopathy (DCM)...
March 26, 2018: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29589406/improved-cardiorespiratory-fitness-following-moderate-exercise-may-encourage-inactive-people-for-doable-and-sustainable-behavioral-change
#15
Gábor Pavlik, Eva Bakács, Eszter Csajági, Tibor Bakács, Judit Noe, Robert Kirschner
BACKGROUND: Global physical inactivity pandemic is responsible for more than 5 million deaths annually through its effects on non-communicable diseases. This requires urgent intervention. OBJECTIVE: To investigate associations of physical activity with cardiovascular fitness in a cross-sectional retrospective observational study. Data were collected for 21 years from 2530 healthy volunteers and athletes representing the entire spectrum of physical activity from the totally inactive sedentary persons to the highly trained national athletes...
March 27, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29589291/modelling-movement-energetics-using-global-positioning-system-devices-in-contact-team-sports-limitations-and-solutions
#16
REVIEW
Adrian J Gray, Kathleen Shorter, Cloe Cummins, Aron Murphy, Mark Waldron
Quantifying the training and competition loads of players in contact team sports can be performed in a variety of ways, including kinematic, perceptual, heart rate or biochemical monitoring methods. Whilst these approaches provide data relevant for team sports practitioners and athletes, their application to a contact team sport setting can sometimes be challenging or illogical. Furthermore, these methods can generate large fragmented datasets, do not provide a single global measure of training load and cannot adequately quantify all key elements of performance in contact team sports...
March 27, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29581653/effects-of-mechanical-bed-massage-on-exercise-induced-back-fatigue-in-athletes
#17
Houyong Zhong, Wichai Eungpinichpong, Xingze Wang, Uraiwon Chatchawan, Sawitri Wanpen, Orawan Buranruk
[Purpose] The study aimed to preliminarily investigate the effects of mechanical-bed massage on exercise-induced back fatigue in athletes. [Subjects and Methods] Twelve male college athletes, randomly allocated to experimental or control groups, were instructed to perform reverse sit-up for 8 sessions until they became fatigued. The experimental group received a 20-min mechanical-bed massage session, while the control group rested on a bed for the same period of time. Visual Analogue Scale (VAS) on perceived back muscle fatigue, back muscle endurance, and Heart Rate Variability (HRV) parameters including stress index (SI), HRV index, SDNN, RMSSD, pNN50, LF, HF, and LF/HF were analyzed...
March 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29580672/athlete-s-heart-and-soldier-s-heart-is-morganroth-striking-back
#18
Nuno Cardim
No abstract text is available yet for this article.
March 23, 2018: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29575042/monitoring-morphologic-changes-in-male-rowers-using-limited-portable-echocardiography-performed-by-a-frontline-physician
#19
Deanna L Kerkhof, Caroline Lucas, Gianmichel D Corrado
Athletes' hearts have been studied for adaptive changes in response to exercise. Physiologic changes are normal responses to intense athletic training regimens, whereas pathologic changes predispose athletes to sudden cardiac death. The two alterations overlap in clinical presentation. Research continues to investigate the upper limits of cardiac remodeling to aid clinical decision making. Studying normal changes that occur in response to exercise will advance physicians' understanding of physiologic responses to exercise and potentially improve clinical distinction...
March 25, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29570571/cardiac-autonomic-and-blood-pressure-responses-to-an-acute-foam-rolling-session
#20
Kevin Lastova, Michael Nordvall, Michelle Walters-Edwards, Amy Allnutt, Alexei Wong
Foam Rolling (FR) is a self-myofascial release method that has become extremely popular among athletes and fitness enthusiasts for its ability to improve flexibility and range of motion and alleviate delayed onset muscle soreness. However, the cardiac autonomic modulation and blood pressure (BP) responses induced by an acute FR session are currently unknown. The present study evaluated the effects of an acute session of FR exercise on heart rate variability (HRV) and BP responses in healthy individuals. Fifteen (M=8, F=7) healthy subjects completed either a FR or non-exercise control trial in randomized order...
March 22, 2018: Journal of Strength and Conditioning Research
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