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https://www.readbyqxmd.com/read/28647809/left-ventricles-of-aging-athletes-better-untwisters-but-not-more-relaxed-during-exercise
#1
Claire Maufrais, G Doucende, T Rupp, M Dauzat, P Obert, S Nottin, I Schuster
OBJECTIVE: With an aging population and the increasing prevalence of heart failure with preserved ejection fraction, developing strategies to prevent diastolic dysfunction is crucial. Regular endurance training has been suggested to be one such strategy. However, the underlying mechanisms of training, including the effect on left ventricular (LV) untwist, which promotes LV filling, are unclear and studies exploring the heart during exercise in the aging heart are lacking. METHODS: Cardiopulmonary exercise testing with speckle tracking echocardiography was realized in male subjects: 16 young athletes (YA), 19 young controls (YC), 22 middle-aged athletes (MA) with a lifelong history of endurance training, and 20 middle-aged controls (MC)...
June 24, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28646812/oral-consumption-of-vitamin-k2-for-8-weeks-associated-with-increased-maximal-cardiac-output-during-exercise
#2
Brian K McFarlin, Andrea L Henning, Adam S Venable
Background • Vitamin K1 and K2 are not typically common in a Western diet because they are found in a variety of fermented foods. Vitamin K2 in particular has been demonstrated to restore mitochondrial function and has a key role in production of mitochondrial adenosine triphosphate. Thus, it is reasonable to speculate that dietary supplementation with vitamin K2 could increase the function of muscle with high mitochondrial content (ie, skeletal and cardiac muscle). Objective • The purpose of this study was to determine if 8 wk of dietary supplementation with Vitamin K2 could alter cardiovascular responses to a graded cycle ergometer test...
July 2017: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/28640770/physiological-responses-and-time-motion-analysis-of-small-combat-games-in-kickboxing-impact-of-ring-size-and-number-of-within-round-sparring-partners
#3
Ibrahim Ouergui, Nizar Houcine, Hamza Marzouki, Philip Davis, Emerson Franchini, Nabil Gmada, Ezzedine Bouhlel
Ouergui, I, Houcine, N, Marzouki, H, Davis, P, Franchini, E, Gmada, N, and Bouhlel, E. Physiological responses and time-motion analysis of small combat games in kickboxing: impact of ring size and number of within-round sparring partners. J Strength Cond Res 31(7): 1840-1846, 2017-The study aimed to investigate the physiological responses and time-structure of small combat games (SCGs) in kickboxing according to ring sizes and number of sparring partners. Twenty athletes from regional (n = 13) and national levels (n = 7) participated in the study (mean ± SD, age: 20...
July 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28639769/-heart-and-sport
#4
Vincent Gabus, Pierre Monney
Physical activity is beneficial for health and the cardiovascular risk profile. However, it can be dangerous in people with cardiac disease that might be asymptomatic. Individuals of all ages and all levels engage in sporting activities. The medical approach is different whether one evaluates a young competitive athlete, a sedentary adult who wants to start a recreational sport or a patient with heart disease who wishes to engage in sport. This article summarizes the various recommendations on the subject.
May 24, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28639445/periodized-training-archive-better-autonomic-modulation-and-aerobic-performance-than-non-periodized-training
#5
Vicente J Clemente-Suarez
BACKGROUND: The aim of the present research was to analyze autonomic response and aerobic performance after performing three different workloads training distributions. METHODS: Thirty athletes (38.7±9.8 years. 174.7±6.5 cm. 72.0±9.8 kg) were randomly divided in 3 groups of 10 participants each one to perform 3 different 4-week training programs: PRO group: increasing the aerobic training intensity during the 4-weeks; UNI group: performing a uniform aerobic intensity every week; and FRE group performing a free training...
June 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28639443/relationship-between-the-handball-specific-complex-test-nonspecific-field-tests-and-the-match-performance-score-in-elite-professional-handball-players
#6
Souhail Hermassi, Mohamed S Chelly, Rainer Wollny, Birgit Hoffmeyer, Georg Fieseler, Stephan Schulze, Lars Irlenbusch, Karl-Stefan Delank, Roy J Shephard, Thomas Bartels, René Schwesig
BACKGROUND: This study assessed the validity of the handball-specific complex-test (HBCT) and two nonspecific field tests in professional elite handball athletes, using the match performance score (MPS) as the gold standard of performance. METHODS: Thirteen elite male handball players (age: 27.4 ± 4.8 years; premier German league) performed the HBCT, the Yo-Yo Intermittent Recovery Test (Yo-Yo-IR1-test) and a repeated shuttle sprint ability (RSA) test at the beginning of pre-season training...
June 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28630583/acute-modification-of-cardiac-autonomic-function-of-high-intensity-interval-training-in-collegiate-male-soccer-players-with-different-chronotype-a-cross-over-study
#7
Matteo Bonato, Luca Agnello, Letizia Galasso, Angela Montaruli, Eliana Roveda, Giampiero Merati, Antonio La Torre, Jacopo A Vitale
The purpose of this study was to evaluate if the time of the day (8.00 a.m. vs 8.00 p.m.) and chronotype could influence autonomic cardiac control in soccer players in relation to an acute session of high-intensity interval training. The morningness-eveningness questionnaire was administered to recruit Morning-type and Evening-type collegiate male soccer players. Therefore, 24 players (12 Morning-types and 12 Evening-types) were randomly assigned, to either morning (n = 12; age 23 ± 3 years; height 1.75 ± 0...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630575/acute-and-post-exercise-physiological-responses-to-high-intensity-interval-training-in-endurance-and-sprint-athletes
#8
Lukas Cipryan, Gerhard Tschakert, Peter Hofmann
The purpose of the presented study was to compare acute and post-exercise differences in cardiorespiratory, metabolic, cardiac autonomic, inflammatory and muscle damage responses to high-intensity interval exercise (HIIT) between endurance and sprint athletes. The study group consisted of sixteen highly-trained males (age 22.1 ± 2.5 years) participating in endurance (n = 8) or sprint (n = 8) sporting events. All the participants underwent three exercise sessions: short HIIT (work interval duration 30s), long HIIT (3min) and constant load exercise (CE)...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28628053/heart-rate-and-blood-pressure-responses-to-gear-weight-under-a-controlled-workload
#9
Cassandra C Derella, Kristin R Aichele, Joyann E Oakman, Christina M Cromwell, Jessica A Hill, Lauren N Chavis, Avery N Perez, Allyson K Getty, Tia R Wisdo, Deborah L Feairheller
OBJECTIVE: To compare the effects of personal protective equipment (PPE) weight on blood pressure (BP) and heart rate (HR), between volunteer firefighters (FF) and athletes. METHODS: Athletes and FF were matched by body size and came to the lab twice for two treadmill tests. The "Regular" test was completed in normal fitness clothing, and PPE test was completed in full structural PPE with monitoring of HR assessment every minute and BP each stage. RESULTS: In the FF cohort, all submaximal HR and BP levels were different...
April 2017: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28622665/non-invasive-in-situ-measurement-of-blood-lactate-using-microwave-sensors
#10
Alex Mason, Olga Korostynska, Julien Louis, Luis Eduardo Cordova-Lopez, Badr Abdullah, Jacob Greene, Rob Connell, John Hopkins
GOAL: This paper reports the use of a novel electromagnetic sensor technique for real-time non-invasive monitoring of blood lactate in human subjects. METHODS: The technique was demonstrated on 34 participants who undertook a cycling regime, with rest period before and after, to produce a rising and falling lactate response curve. Sensors attached to the arm and legs of participants gathered spectral data, blood samples were measured using a Lactate Pro V2, as well as temperature and heart rate data were collected...
June 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28615996/international-society-of-sports-nutrition-position-stand-safety-and-efficacy-of-creatine-supplementation-in-exercise-sport-and-medicine
#11
REVIEW
Richard B Kreider, Douglas S Kalman, Jose Antonio, Tim N Ziegenfuss, Robert Wildman, Rick Collins, Darren G Candow, Susan M Kleiner, Anthony L Almada, Hector L Lopez
Creatine is one of the most popular nutritional ergogenic aids for athletes. Studies have consistently shown that creatine supplementation increases intramuscular creatine concentrations which may help explain the observed improvements in high intensity exercise performance leading to greater training adaptations. In addition to athletic and exercise improvement, research has shown that creatine supplementation may enhance post-exercise recovery, injury prevention, thermoregulation, rehabilitation, and concussion and/or spinal cord neuroprotection...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28613960/the-effect-of-air-pollution-on-diurnal-variation-of-performance-in-anaerobic-tests-cardiovascular-and-hematological-parameters-and-blood-gases-on-soccer-players-following-the-yo-yo-intermittent-recovery-test-level-1
#12
Nesrin Boussetta, Salma Abedelmalek, Khouloud Aloui, Nizar Souissi
This study aimed to investigate the effect of air pollution on diurnal variation of performance in anaerobic tests, cardiovascular and hematological parameters, and blood gases on soccer players following the Yo-Yo Intermittent Recovery Test Level-1 (YYIRT1). In a randomized order, 11 healthy soccer players (mean age: 21.8 [range: 20-24] years; height: 178.00 [range: 1.64-1.83] cm; body mass index [BMI]: 23.57 [range: 20.45-28.03] kg.m(-2)) performed a YYIRT1 at two different times of day (TOD) (08:00 h and 18:00 h) in two areas (i...
June 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28605210/pacing-strategy-during-simulated-mountain-bike-racing
#13
Bruno Ferreira Viana, Flávio Oliveira Pires, Allan Inoue, Tony Meireles Santos
Cross-country mountain biking (XCO) is a popular high-intensity cycling endurance event, however, XCO pacing strategy has not been fully examined. This study examined the pacing strategies of different XCO athletes, during a laboratory-simulated XCO performance test. Brazilian cyclists classified as performance cohort level three (PL3-trained) performed an XCO race simulation. The simulation consisted of four 10 km laps with a gradient of 0-10%. No group vs. time interaction was found in lap time (P = 0.169), absolute (P = 0...
June 12, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28574282/prevention-of-sudden-death-in-adolescent-athletes-incremental-diagnostic-value-and-cost-effectiveness-of-diagnostic-tests
#14
Gonzalo Grazioli, Maria Sanz de la Garza, Barbara Vidal, Silvia Montserrat, Georgia Sarquella-Brugada, Ramon Pi, Lluis Til, Josep Gutierrez, Josep Brugada, Marta Sitges
Introduction Pre-participation screening in athletes attempts to reduce the incidence of sudden death during sports by identifying susceptible individuals. The objective of this study was to evaluate the diagnostic capacity of the different pre-participation screening points in adolescent athletes and the cost effectiveness of the programme. Methods Athletes were studied between 12-18 years old. Pre-participation screening included the American Heart Association questionnaire, electrocardiogram, echocardiogram, and stress test...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28573597/effect-of-heart-rate-variability-biofeedback-on-sport-performance-a-systematic-review
#15
REVIEW
Sergio Jiménez Morgan, José Arturo Molina Mora
Aim is to determine if the training with heart rate variability biofeedback allows to improve performance in athletes of different disciplines. Methods such as database search on Web of Science, SpringerLink, EBSCO Academic Search Complete, SPORTDiscus, Pubmed/Medline, and PROQUEST Academic Research Library, as well as manual reference registration. The eligibility criteria were: (a) published scientific articles; (b) experimental studies, quasi-experimental, or case reports; (c) use of HRV BFB as main treatment; (d) sport performance as dependent variable; (e) studies published until October 2016; (f) studies published in English, Spanish, French or Portuguese...
June 1, 2017: Applied Psychophysiology and Biofeedback
https://www.readbyqxmd.com/read/28544314/low-intensity-endurance-exercise-plus-nandrolone-decanoate-modulates-cardiac-adiponectin-and-its-receptors
#16
A Karimi, S Joukar, H Najafipour, Y Masoumi-Ardakani, B Shahouzehi
Vast adverse effects of anabolic-androgenic steroids (AASs) on athletes' cardiovascular systems have been reported. However, there is still a lack of adequate information regarding the pathways and mechanisms involved. We tested the hypothesis that adiponectin and its receptors in the heart may be affected by long-term use of AASs alongside exercising. Male Wistar rats were randomized into the control (CTL), exercise (EX), nandrolone (Nan), arachis (Arach) group which treated with arachis as vehicle, trained vehicle (EX+Arach) and trained nandrolone (EX+Nan) groups that were treated for 8 weeks...
March 2017: Autonomic & Autacoid Pharmacology
https://www.readbyqxmd.com/read/28543790/are-heart-rate-monitors-valuable-tools-for-diagnosing-arrhythmias-in-endurance-athletes
#17
R Gajda, E K Biernacka, W Drygas
Millions of physically active individuals worldwide use heart rate monitors (HRMs) to control their exercise intensity. In many cases, the HRM indicates an unusually high heart rate (HR) or even arrhythmias during training. Unfortunately, studies assessing the reliability of these devices to help control HR disturbances during exercise do not exist. We examined 142 regularly training endurance runners and cyclists, aged 18-51 years, with unexplained HR abnormalities indicated by various HRMs to assess the utility of HRMs in diagnosing exertion-induced arrhythmias...
May 19, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28538325/heart-rate-variability-discriminates-competitive-levels-in-professional-soccer-players
#18
Riccardo Proietti, Selenia di Fronso, Lucas A Pereira, Laura Bortoli, Claudio Robazza, Fabio Y Nakamura, Maurizio Bertollo
Proietti, R, di Fronso, S, Pereira, LA, Bortoli, L, Robazza, C, Nakamura, FY, and Bertollo, M. Heart rate variability discriminates competitive levels in professional soccer players. J Strength Cond Res 31(6): 1719-1725, 2017-Heart rate variability (HRV) has been increasingly used to monitor team sports athletes. Besides the traditional time domain indices (i.e., the SD of successive RR intervals [SDNN] and the root mean square difference of successive normal RR intervals [RMSSD]), recently the use of the stress score (SS), which is an inverse function of the SD2 index derived from the Poincaré plot, and the sympathetic/parasympathetic ratio (S/PS) to monitor soccer players has been proposed...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28538315/evaluation-of-the-effectiveness-of-compression-garments-on-autonomic-nervous-system-recovery-after-exercise
#19
Alessandro Piras, Giorgio Gatta
The aim of this investigation was to evaluate the recovery pattern of a whole-body compression garment on hemodynamic parameters and on autonomic nervous system (ANS) activity after a swimming performance. Ten young male athletes were recruited and tested in 2 different days, with and without wearing the garment during the recovery phase. After a warm-up of 15 minutes, athletes were instructed to perform a maximal 400-m freestyle swimming event, and then time series of beat-to-beat intervals for heart rate variability (HRV), baroreflex sensitivity (BRS), and hemodynamic parameters were recorded for 90 minutes of recovery...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28538304/a-performance-analysis-of-a-stand-up-paddle-board-marathon-race
#20
Ben L Schram, Wayne A Hing, Mike Climstein, James W Furness
Stand-up paddle boarding (SUP) is a rapidly growing sport and recreational activity in which little scientific research exists. A review of the literature failed to identify a single article pertaining to the physiological demands of SUP competition. The purpose of this study was to conduct a performance analysis of a national-level SUP marathon race. Ten elite SUP athletes (6 male and 4 female athletes) were recruited from the Stand Up Paddle Surfing Association of Australia to have their race performance in the Australian Titles analyzed...
June 2017: Journal of Strength and Conditioning Research
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