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https://www.readbyqxmd.com/read/28197053/large-in-transient-left-ventricular-thrombus-due-to-anabolic-steroid-induced-cardiomyopathy
#1
Feridoun Sabzi, Reza Faraji
The presence of small or moderate size thrombosis is not uncommon in left ventricle (LV) as results of basic co-moribund disease, but huge LV thrombosis that protrudes to aortic valve in the LV outflow tract (LVOT) tract is an exceptionally rare phenomenon. We report a 34-year-old bodybuilder athlete with cardiomyopathy and massive LV thrombosis. The thrombosis extended to LVOT and protruded through the aortic valve in systole and posed a high risk of systemic emboli. The patient underwent open heart surgery, and the clot was removed...
January 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28195974/validity-of-the-elite-hrv-smart-phone-application-for-examining-heart-rate-variability-in-a-field-based-setting
#2
A S Perrotta, A Jeklin, B A Hives, L E Meanwell, D E R Warburton
The introduction of smart phone applications has allowed athletes and practitioners to record and store R-R intervals on smart phones for immediate heart rate variability (HRV) analysis. This user-friendly option should be validated in the effort to provide practitioners confidence when monitoring their athletes before implementing such equipment.The objective of this investigation was to examine the relationship between a vagal related HRV index, rMSSD when derived from a smart phone application accessible with most smart phone operating systems against Kubios HRV 2...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28195970/reduction-of-physiological-strain-under-a-hot-and-humid-environment-by-a-hybrid-cooling-vest
#3
Albert P C Chan, Y Yang, Francis K W Wong, Michael C H Yam, Del P Wong, W F Song
Cooling treatment is regarded as one of good practices to provide safe training conditions to athletic trainers in the hot environment. The present study aimed to investigate whether wearing a commercial lightweight and portable hybrid cooling vest that combines air ventilation fans with frozen gel packs was an effective means to reduce participants' body heat strain. In this within-subject repeated measures study, 10 male volunteers participated in two heat-stress trials (one with the cooling vest - COOL condition, and another without - CON condition, in a randomized order) inside a climatic chamber with a controlled ambient temperature 33 °C and relative humidity (RH) 75% on an experimental day...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28192034/physiological-and-perceived-responses-in-different-levels-of-exergames-in-elite-athletes
#4
Louisa Ming Yan Chung, Feng Hua Sun, Chris Tsz Man Cheng
OBJECTIVE: Exergames have been suggested to increase the public's physical activity and to benefit cardiovascular health, particularly among the youth. However, not many studies compared the physiological and perceived responses between exergames and the authentic sports especially for elite athletes. This study aimed to investigate the physiological and perceived responses in different levels of Nintendo(®) Wii Fit™ U rowing exergames in one group of elite rowing athletes. MATERIALS AND METHODS: All participants were asked to perform the authentic rowing on the indoor rowing machine on the first day and to play the rowing exergames on the second day, in three levels with 1 hour rest between levels...
February 2017: Games for Health
https://www.readbyqxmd.com/read/28188371/the-effect-of-functional-overreaching-on-parameters-of-autonomic-heart-rate-regulation
#5
Clint R Bellenger, Rebecca L Thomson, Eileen Y Robertson, Kade Davison, Maximillian J Nelson, Laura Karavirta, Jonathan D Buckley
PURPOSE: Correlations between fatigue-induced changes in performance and maximal rate of HR increase (rHRI) may be affected by differing assessment workloads. This study evaluated the effect of assessing rHRI at different workloads on performance tracking, and compared this with HR variability (HRV) and HR recovery (HRR). METHODS: Performance [5-min cycling time trial (5TT)], rHRI (at multiple workloads), HRV and HRR were assessed in 12 male cyclists following 1 week of light training (LT), 2 weeks of heavy training (HT) and a 10-day taper (T)...
February 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28185706/training-induced-right-ventricular-remodelling-in-pre-adolescent-endurance-athletes-the-athlete-s-heart-in-children
#6
Flavio D'Ascenzi, Antonio Pelliccia, Francesca Valentini, Angela Malandrino, Benedetta Maria Natali, Riccardo Barbati, Marta Focardi, Marco Bonifazi, Sergio Mondillo
AIMS: Little is known about the adaptation of the right ventricle (RV) to endurance exercise in children. The aim of this study was to assess the effects of 5months of intensive training on RV morphology and function in preadolescent endurance athletes. METHODS: Ninety-four children were evaluated in this study. Fifty-seven male competitive swimmers (aged 10.8±0.2years) were evaluated before (baseline) and after 5months of the training (peak-training), and compared to 37 age- and sex-matched non-athlete children evaluated at baseline and after 5months of natural growth...
January 27, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28182508/effects-of-carbohydrate-ingestion-and-carbohydrate-mouth-rinse-on-repeat-sprint-performance
#7
Ben M Krings, Timothy J Peterson, Brandon D Shepherd, Matthew J McAllister, JohnEric W Smith
The purpose of this investigation was to examine to the influence of carbohydrate ingestion (CHOI) and carbohydrate mouth rinse (CHOR) on acute repeat maximal sprint performance. Fourteen healthy males (age: 21.7 ± 1.8 years, mass: 82.3 ± 12.3 kg) completed a total of five 15-second maximal repeat sprints on a cycle ergometer against 0.075 kg . kg(-1) body mass each separated by four minutes of active recovery. Subjects completed four experimental trials and were randomly assigned one of four treatments: (1) CHOI, (2) CHOR, (3) placebo mouth rinse (PLAR), (4) placebo ingestion (PLAI)...
February 9, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28181776/cardiovascular-adjustments-to-heat-stress-during-prolonged-exercise
#8
Luna Rizzo, Martin W Thompson
Prolonged effort in hot environments is increasing popular in extreme sports. The number of long distance athletes taking part in races in extremely warm condition, as in deserts, is larger than in the past and also the race distances are increased thus. The demanding for the heart function are higher than those challenged in the past only by few athletes and in easier conditions. This puts news challenges on the professional involved in these activities and there is a need to better understand how the cardiocirculatory system responses in these extreme environmental conditions...
February 8, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28181710/on-field-prediction-vs-monitoring-of-aerobic-capacity-markers-using-submaximal-lactate-and-heart-rate-measures
#9
Ibai Garcia-Tabar, Mikel Izquierdo, Esteban M Gorostiaga
This study aimed to validate the use of a single blood lactate concentration measurement taken following a 5-min running bout at 10 km·h(-1) (BLC10 ) and the speed associated with 90% of maximal heart rate (S90 ) to predict and monitor fixed blood lactate concentration (FBLC) thresholds in athletes. Three complementary studies were undertaken. Study-I: A cross-sectional study examining the associations of BLC10 and S90 with running speeds at FBLC of 3 (S3mM) and 4 mmol·L(-1) (S4mM) in 100 athletes. Study-II: A cross-validation study assessing the predictive capacity of BLC10 and S90 to estimate FBLC thresholds in real practice...
February 9, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28177719/impact-of-polyphenols-on-physiological-stress-and-cardiac-burden-in-marathon-runners-results-from-a-substudy-of-the-bemagic-study
#10
Sebastian Clauss, Johannes Scherr, Alan Hanley, Jens Schneider, Ina Klier, Korbinian Lackermair, Eva Hoster, Michael Vogeser, David C Nieman, Martin Halle, Thomas Nickel
Introduction Both physiologic stress and chronic heart disease are associated with increased systemic levels of chromogranin A (CGA) and NT-proBNP. Marathon running causes physiological stress and imposes a significant cardiac burden. Polyphenol-rich Mediterranean and Asian diets have been demonstrated to exert beneficial effects on the cardiovascular system. In this study we investigated whether pretreatment with a polyphenol beverage could attenuate the physiological and cardiac stress associated with a marathon...
January 16, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177711/the-influence-of-genetic-polymorphisms-on-performance-cardiac-and-hemodynamic-parameters-among-brazilian-soccer-players
#11
Thiago José Dionísio, Carlos Rogério Thiengo, Daniel Thomas Brozoski, Evandro José Dionísio, Guilherme Augusto Talamoni, Roberto Braga Silva, Gustavo Pompermaier Garlet, Carlos Ferreira Santos, Sandra Lia Amaral
This study investigated whether ACTN3 R577X, AMPD1 C34T, I/D ACE and M235T AGT polymorphisms can affect performance tests such as jumping, sprinting and endurance in 220 young male athletes from professional minor league soccer team from São Paulo Futebol Clube, Brazil. I/D ACE and M235T AGT polymorphisms were also analyzed according to cardiac and hemodynamic parameters. Athletes were grouped or not by age. DNA from saliva and Taqman® assays were used for genotyping 220 athletes and the results were associated with performance tests...
January 24, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28168782/physiological-responses-during-the-practice-of-synchronized-swimming-a-systematic-review
#12
REVIEW
Kátia Ponciano, Maria Luiza de Jesus Miranda, Miwako Homma, João Marcelo Queiroz Miranda, Aylton J Figueira Júnior, Cássio De Miranda Meira Júnior, Danilo Sales Bocalini
This study is aimed at analysing the scientific literature related to physiological responses in synchronized swimmers, produced from 2006 to 2016. A systematic review was conducted using electronic databases (Google Scholar, PubMed, SportDiscus, Web Science, Scielo and Scopus) in national and international journals. The articles were selected using the following inclusion criteria: composed samples of synchronized swimmers of both sexes, articles in English, Spanish and Portuguese, published from 2006 to 2016...
February 6, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28166116/cerebral-blood-flow-responses-to-aquatic-treadmill-exercise
#13
Rhodri Parfitt, Marianne Y Hensman, Samuel J E Lucas
INTRODUCTION: Aquatic treadmills are used as a rehabilitation method for conditions such as spinal cord injury, osteoarthritis and stroke, and can facilitate an earlier return to exercise training for athletes. However, their effect on cerebral blood flow (CBF) responses has not been examined. We tested the hypothesis that aquatic treadmill exercise would augment CBF and lower heart rate compared to land-based treadmill exercise. METHODS: Eleven participants completed incremental exercise (crossover design) starting from walking pace [4 km/h, immersed to iliac crest (aquatic), 6 km/h (land)] and increasing 1 km/h every 2 min up to 10 km/h for aquatic (maximum belt speed) or 12 km/h for land...
February 4, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28158252/physiological-responses-and-external-validity-of-a-new-setting-for-taekwondo-combat-simulation
#14
Matheus Hausen, Pedro Paulo Soares, Marcus Paulo Araújo, Flávia Porto, Emerson Franchini, Craig Alan Bridge, Jonas Gurgel
Combat simulations have served as an alternative framework to study the cardiorespiratory demands of the activity in combat sports, but this setting imposes rule-restrictions that may compromise the competitiveness of the bouts. The aim of this study was to assess the cardiorespiratory responses to a full-contact taekwondo combat simulation using a safe and externally valid competitive setting. Twelve male national level taekwondo athletes visited the laboratory on two separate occasions. On the first visit, anthropometric and running cardiopulmonary exercise assessments were performed...
2017: PloS One
https://www.readbyqxmd.com/read/28149417/determination-of-aerobic-power-through-a-specific-test-for-taekwondo-a-predictive-equation-model
#15
Fernando P S Rocha, Hugo Louro, Ricardo Matias, João Brito, Aldo M Costa
Our aim was to verify the concurrent validity of a maximal taekwondo specific test (TST) to predict VO2max through an explanatory model. Seventeen elite male taekwondo athletes (age: 17.59 ± 4.34 years; body height: 1.72 ± 6.5 m; body mass: 61.3 ± 8.7 kg) performed two graded maximal exercise tests on different days: a 20 m multistage shuttle run test (SRT) and an incremental TST. We recorded test time, VO2max, ventilation, a heart rate and time to exhaustion. Significant differences were found between observed and estimated VO2max values [F (2, 16) = 5...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149413/left-atrial-enlargement-in-young-high-level-endurance-athletes-another-sign-of-athlete-s-heart
#16
Wojciech Król, Ilona Jędrzejewska, Marcin Konopka, Krystyna Burkhard-Jagodzińska, Andrzej Klusiewicz, Andrzej Pokrywka, Jolanta Chwalbińska, Dariusz Sitkowski, Mirosław Dłużniewski, Artur Mamcarz, Wojciech Braksator
Enlargement of the left atrium is perceived as a part of athlete's heart syndrome, despite the lack of evidence. So far, left atrial size has not been assessed in the context of exercise capacity. The hypothesis of the present study was that LA enlargement in athletes was physiological and fitness-related condition. In addition, we tried to assess the feasibility and normal values of left atrial strain parameters and their relationship with other signs of athlete's heart. The study group consisted of 114 international-level rowers (17...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149369/the-effect-of-the-mthfr-c677t-mutation-on-athletic-performance-and-the-homocysteine-level-of-soccer-players-and-sedentary-individuals
#17
Nurten Dinç, Selda Bereket Yücel, Fatma Taneli, Metin Vehbi Sayın
This study investigated athletic performance and homocysteine (Hcy) levels in relation to the methylenetetrahydrofolate reductase (MTHFR) C677T mutation and explored the relationship between this mutation and other cardiac risk factors in soccer players and sedentary individuals. The study groups consisted of randomly selected soccer players (n=48) from the Turkish Super and Major League and sedentary male students (n=48) aged 18-27. Anthropometric variables, aerobic and anaerobic thresholds were measured, furthermore, biochemical assays were performed...
June 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149347/application-of-a-physiological-strain-index-in-evaluating-responses-to-exercise-stress-a-comparison-between-endurance-and-high-intensity-intermittent-trained-athletes
#18
Ilona Pokora, Aleksandra Żebrowska
The study evaluated differences in response to exercise stress between endurance and high-intensity intermittent trained athletes in a thermoneutral environment using a physiological strain index (PSI). Thirty-two subjects participated in a running exercise under normal (23°C, 50% RH) conditions. The group included nine endurance trained athletes (middle-distance runners - MD), twelve high-intensity intermittent trained athletes (soccer players - HIIT) and eleven students who constituted a control group. The exercise started at a speed of 4 km·h(-1) which was increased every 3 min by 2 km·h(-1) to volitional exhaustion...
April 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28148495/sport-related-concussion-induces-transient-cardiovascular-autonomic-dysfunction
#19
John L Dobson, Mary Beth Yarbrough, Jose Perez, Kelsey Evans, Thomas Buckley
Recent evidence suggests that concussions may disrupt autonomic cardiovascular control. This study investigated the initial effects of concussion on cardiovascular function using three autonomic reflex tests. Twenty three recreational athletes (12 females, 11 males) were divided into concussed (n = 12) and control (n = 11) groups. Concussed participants performed forced breathing, standing and Valsalva autonomic tests four times: 1) within 48 hours of injury, 2) 24 hours later, 3) 1 week after injury and 4) 2 weeks after injury...
February 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28147384/-congenital-heart-diseases-and-sports
#20
Friederike Wippermann, Renate Oberhoffer, Alfred Hager
Daily activity is essential for children's development. Especially children with congenital heart disease do not burden adequate, even physical activity is beneficial for them. They should get used to activity and individual athletic performance. Once risks are defined or excluded in a cardiological examination, a detailed sports medical examination is recommended to give advice on individual intensity for leisure and school sports activities. By participation in sporting activities with their peers, they will benefit both physically as well as psychologically...
January 2017: Klinische Pädiatrie
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