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https://www.readbyqxmd.com/read/29449080/influence-of-exercise-modality-on-cardiac-parasympathetic-and-sympathetic-indices-during-post-exercise-recovery
#1
Scott Michael, Ollie Jay, Kenneth S Graham, Glen M Davis
OBJECTIVES: This study investigated indirect measures of post-exercise parasympathetic reactivation (using heart-rate-variability, HRV) and sympathetic withdrawal (using systolic-time-intervals, STI) following upper- and lower-body exercise. DESIGN: Randomized, counter-balanced, crossover. METHODS: 13 males (age 26.4±4.7years) performed maximal arm-cranking (MAX-ARM) and leg-cycling (MAX-LEG). Subsequently, participants undertook separate 8-min bouts of submaximal HR-matched exercise of each mode (ARM and LEG)...
February 12, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29446708/does-local-dynamic-stability-of-kayak-paddling-technique-affect-the-sports-performance-a-pilot-study
#2
Daniel Hamacher, Tobias Krebs, Guido Meyer, Astrid Zech
During competition, kayak athletes must optimally adapt to environmental factors (e.g. wind, waves) to achieve peak performance. However, the ability to adapt to such perturbations has never been assessed in kayak paddling. Therefore, the aim of the current study was to evaluate the local dynamic stability in sports technique of youth sprint kayak athletes. In a cross-sectional study, 14 healthy male athletes were recruited from an elite youth sprint kayak squad. During an incremental kayak ergometer test, mean power, heart rates and local dynamic technique stability of hands, arms, trunk and paddle were registered and the association with the athletes 2000 m free-water times were estimated using mixed models...
February 15, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29444414/no-individual-or-combined-effects-of-caffeine-and-beetroot-juice-supplementation-during-submaximal-or-maximal-running
#3
Johanna Oskarsson, Kerry McGawley
BACKGROUND: Dietary supplements such as caffeine and beetroot juice are used by athletes in an attempt to optimize performance and therefore gain an advantage in competition. AIM: To investigate the individual and combined effects of caffeine and beetroot-juice supplementation during submaximal and maximal treadmill running. METHODS: Seven males (VO<sub>2max</sub>: 59.0 ± 2.9 mL/kg/min) and two females (VO<sub>2max</sub>: 53...
February 14, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29444412/heart-rate-variability-responses-to-acute-and-repeated-post-exercise-sauna-in-trained-cyclists
#4
Anthony S Leicht, Aaron Halliday, Wade H Sinclair, Shaun D'Auria, Martin Buchheit, Glen P Kenny, Jamie Stanley
Short- to medium-term (i.e. 4-14 days) heating protocols induce physiological adaptations including improved cardiac autonomic modulations, as assessed using heart rate variability, which may contribute to greater exercise performance. Whether similar cardiac autonomic changes occur during an intense heating protocol (sauna) reported to increase plasma volume in athletes remains to be confirmed. This study examined the changes in heart rate and its variability during a single, extreme heat (sauna) exposure and repeated exposures in athletes...
February 14, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29444097/the-effects-of-intensified-training-on-resting-metabolic-rate-rmr-body-composition-and-performance-in-trained-cyclists
#5
Amy L Woods, Anthony J Rice, Laura A Garvican-Lewis, Alice M Wallett, Bronwen Lundy, Margot A Rogers, Marijke Welvaert, Shona Halson, Andrew McKune, Kevin G Thompson
BACKGROUND: Recent research has demonstrated decreases in resting metabolic rate (RMR), body composition and performance following a period of intensified training in elite athletes, however the underlying mechanisms of change remain unclear. Therefore, the aim of the present study was to investigate how an intensified training period, designed to elicit overreaching, affects RMR, body composition, and performance in trained endurance athletes, and to elucidate underlying mechanisms. METHOD: Thirteen (n = 13) trained male cyclists completed a six-week training program consisting of a "Baseline" week (100% of regular training load), a "Build" week (~120% of Baseline load), two "Loading" weeks (~140, 150% of Baseline load, respectively) and two "Recovery" weeks (~80% of Baseline load)...
2018: PloS One
https://www.readbyqxmd.com/read/29420813/sport-psychology-for-the-soldier-athlete-a-paradigm-shift
#6
Vanessa M Meyer
Background: Competitive athletes train body and mind in preparation for competition with mental fortitude often providing the "winning edge." Similarly, the current-day warfighter faces significant physical and psychological challenges and must be prepared to respond to life-threatening danger with mental and physical agility. Sport Psychology for the Soldier Athlete recognizes the soldier as an elite athlete and provides training required to perform at the highest caliber. Through this curriculum, mental skills coaching in goal setting, imagery, positive self-talk, and heart rate control is integrated into routine physical fitness training...
February 6, 2018: Military Medicine
https://www.readbyqxmd.com/read/29417374/influence-of-different-dynamic-sporting-disciplines-on-right-ventricular-structure-and-function-in-elite-male-athletes
#7
Mohammad Qasem, Keith George, John Somauroo, Lynsey Forsythe, Benjamin Brown, David Oxborough
Our objective was to assess the influence of different levels of exposure to dynamic training on right ventricular (RV) structure, function and mechanics in elite male athletes. We recruited 492 male elite athletes aged between 18 and 30 years old. Athletes were grouped according to their sporting discipline using the Mitchell Classification as Low Dynamic (LD), Moderate Dynamic (MD) or High Dynamic (HD). All participants underwent 2D, Doppler, tissue Doppler and strain (ε) echocardiography with a focused and comprehensive assessment of the right heart...
February 7, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29414256/updated-recommendations-for-athletes-with-heart-disease
#8
Rachel Lampert, Douglas P Zipes
Professional society recommendations to decrease sudden cardiac death in athletes, including eligibility requirements with disqualification for athletes with diagnosed disease as well as preparticipation screening and emergency preparedness, were updated in 2015. The update includes new sections on aortic disease, channelopathies, and sickle cell trait, as well as a change in format from the previous binary yes/no format to the more nuanced and contemporary "class and level of evidence" format. Eighty-four of the 246 recommendations now carry Class II designation-"reasonable," or "may be considered...
January 29, 2018: Annual Review of Medicine
https://www.readbyqxmd.com/read/29411631/the-ambiguity-of-physical-activity-exercise-and-atrial-fibrillation
#9
Bente Morseth, Maja-Lisa Løchen, Inger Ariansen, Marius Myrstad, Dag S Thelle
Although commonly associated with cardiovascular disease or other medical conditions, atrial fibrillation may also occur in individuals without any known underlying conditions. This manifestation of atrial fibrillation has been linked to extensive and long-term exercise, as prolonged endurance exercise has shown to increase prevalence and risk of atrial fibrillation. In contrast, more modest physical activity is associated with a decreased risk of atrial fibrillation, and current research indicates a J-shaped association between atrial fibrillation and the broad range of physical activity and exercise...
January 1, 2018: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/29411287/mechanisms-of-atrial-fibrillation-in-athletes-what-we-know-and-what-we-do-not-know
#10
REVIEW
E Guasch, L Mont, M Sitges
Exercise is an emerging cause of atrial fibrillation (AF) in young individuals without coexisting cardiovascular risk factors. The causes of exercise-induced atrial fibrillation remain largely unknown, and conclusions are jeopardised by apparently conflicting data. Some components of the athlete's heart are known to be arrhythmogenic in other settings. Bradycardia, atrial dilatation and, possibly, atrial premature beats are therefore biologically plausible contributors to exercise-induced AF. Challenging findings in an animal model suggest that exercise might also prompt the development of atrial fibrosis, possibly due to cumulative minor structural damage after each exercise bout...
February 6, 2018: Netherlands Heart Journal
https://www.readbyqxmd.com/read/29406947/preparticipation-screening-of-young-athletes-identifying-cardiovascular-disease
#11
REVIEW
Kyle P Lammlein, Jonathan M Stoddard, Francis G O'Connor
The most common cause of sudden cardiac death (SCD) in young athletes in the United States is "autopsy-negative sudden unexplained death." This makes it extremely difficult to screen for and diagnose predisposing cardiovascular conditions before athletic participation. The goal of the preparticipation physical examination is to detect risk factors for SCD, make risk-based decisions regarding the need for further workup, and ultimately recommend for or against participation. Current evidence recommends universal screening of young athletes using the 14-point American Heart Association preparticipation cardiovascular checklist...
March 2018: Primary Care
https://www.readbyqxmd.com/read/29397314/overload-blunts-baroreflex-only-in-overreached-athletes
#12
Nicolas Bourdillon, Sasan Yazdani, Masih Nilchian, Alessio Mariano, Jean-Marc Vesin, Grégoire P Millet
OBJECTIVES: Heart rate variability (HRV) is commonly used to diagnose overreaching and monitor athletes' responses to training. Baroreflex sensitivity (BRS) is modified by changes in training load and might be another means to detect overreaching. The goal of this study was to assess BRS and HRV changes in two groups of athletes responding either negatively (FOR) or positively (AF) to similar training overload. DESIGN: Fifteen athletes performed 2-week baseline (BSL) training followed by 3-week overload (+45%; OVL) and 2-week recovery (-20%; RCV)...
January 31, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29395633/the-reproducibility-of-10-and-20km-time-trial-cycling-performance-in-recreational-cyclists-runners-and-team-sport-athletes
#13
David N Borg, John O Osborne, Ian B Stewart, Joseph T Costello, Jesse N L Sims, Geoffrey M Minett
OBJECTIVES: This study aimed to determine the reliability of 10 and 20km cycling time trial (TT) performance on the Velotron Pro in recreational cyclists, runners and intermittent-sprint based team sport athletes, with and without a familiarisation. DESIGN: Thirty-one male, recreationally active athletes completed four 10 or 20km cycling TTs on different days. METHODS: During cycling, power output, speed and cadence were recorded at 23Hz, and heart rate and rating of perceived exertion (RPE) were recorded every km...
January 26, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29381184/l%C3%A3-g-f%C3%A3-ljsamhet-till-rekommenderad-hj%C3%A3-rtscreening-av-elitidrottare-l%C3%A3-gesanalys-i-%C3%A3-sterg%C3%A3-tland
#14
Sofia Sunnerud, Eva Nylander, Magnus Janzon, Anna Carlén, Kristofer Hedman
Low adherence to recommended pre-participation cardiac evaluation of Swedish athletes Pre-participation cardiac evaluation of athletes is recommended by international organizations like the European Society of Cardiology and the American Heart Association, as well as by the Swedish Sports Confederation. The purpose of the evaluation is to prevent sudden cardiac death in athletes by early identification of individuals at risk. To our knowledge, no previous study has been made regarding the implementation of pre-participation cardiac evaluation of athletes in Sweden...
January 30, 2018: Läkartidningen
https://www.readbyqxmd.com/read/29373425/the-effect-of-heat-stress-on-measures-of-running-performance-and-heart-rate-responses-during-a-competitive-season-in-male-soccer-players
#15
Nicholas A Coker, Adam J Wells, Yftach Gepner
Measures of running performance (RP) and heart rate responses (HR) to matchplay during three different heat stress (HS) conditions were assessed in seven National Collegiate Athletic Association (NCAA) Division I male soccer players. Total distance (TD), as well as distance covered within distinct velocity zones [walking (WALK), jogging (JOG), low speed running (LSR), high-speed running (HSR), sprinting (SPRINT), low-intensity running (LIR), and high-intensity running (HIR)] were assessed using GPS units over 12 matches...
January 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29373233/instantaneous-vo2-from-a-wearable-device
#16
Andrew J Cook, Ben Ng, Gaetano D Gargiulo, Diane Hindmarsh, Mark Pitney, Torsten Lehmann, Tara Julia Hamilton
We present a method for calculating instantaneous oxygen uptake (VO2) through the use of a non-invasive and non-obtrusive (i.e. without a face mask) wearable device, together with its clinical evaluation against a standard technique based upon expired gas calorimetry. This method can be integrated with existing wearable devices, we implemented it in the "Device for Reliable Energy Expenditure Monitoring" (DREEM). The DREEM comprises a single lead electrocardiogram (ECG) device combined with a tri-axial accelerometer and is worn around the waist...
January 17, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29373205/a-20%C3%A3-20m-repeated-sprint-field-test-replicates-the-demands-of-wheelchair-rugby
#17
Cameron M Gee, Melissa A Lacroix, Christopher R West
OBJECTIVES: To assess the physiological responses to, and the agreement between, a 20×20m repeated sprint field test and wheelchair rugby game play, as well as the reliability of the test. DESIGN: Cross-sectional and longitudinal. METHODS: Heart rate (HR), blood lactate ([La-]B), and ratings of perceived exertion (RPE) were collected in nineteen elite wheelchair rugby athletes before, during, and after a 20×20m repeated sprint field test and game play...
December 16, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29373058/a-functional-return-to-play-progression-after-exertional-heat-stroke-in-a-high-school-football-player
#18
Rebecca M Lopez, Patrick Tanner, Sarah Irani, P Patrick Mularoni
OBJECTIVE:   To present a functional return-to-play (RTP) progression after exertional heat stroke (EHS) in a 17-year-old high school football defensive end (height = 185 cm, mass = 145.5 kg). BACKGROUND:   The patient had no pertinent medical history but moved to a warm climate several days before the EHS occurred. After completing an off-season conditioning test (14- × 110-yd [12.6- × 99.0-m] sprints) on a warm afternoon (temperature = approximately 34°C [93°F], relative humidity = 53%), the patient collapsed...
January 26, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29366731/acute-interruption-of-treatment-with-nandrolone-decanoate-is-not-sufficient-to-reverse-cardiac-autonomic-dysfunction-and-ventricular-repolarization-disturbances-in-rats
#19
Moacir Marocolo, Julio A Silva-Neto, Octávio Barbosa Neto
Anabolic androgenic steroids are a class of synthetic compounds derived from testosterone, eventually used by athletes, to improve physical performance. However, anabolic steroids can also modify normal cardiovascular function. Thus, we investigated cardiac electrophysiological and autonomic abnormalities in rats, through a electrocardiographic variability protocol during and after interruption of administration of nandrolone decanoate (DECA)anabolic steroid. Twenty male Wistar rats (60-70 days old) received DECA (10 mg...
January 20, 2018: Steroids
https://www.readbyqxmd.com/read/29356949/validity-of-the-polar-v800-monitor-for-measuring-heart-rate-variability-in-mountain-running-route-conditions
#20
Pere Caminal, Fuensanta Sola, Pedro Gomis, Eduard Guasch, Alexandre Perera, Núria Soriano, Lluis Mont
PURPOSE: This study was conducted to test, in mountain running route conditions, the accuracy of the Polar V800™ monitor as a suitable device for monitoring the heart rate variability (HRV) of runners. METHOD: Eighteen healthy subjects ran a route that included a range of running slopes such as those encountered in trail and ultra-trail races. The comparative study of a V800 and a Holter SEER 12 ECG Recorder™ included the analysis of RR time series and short-term HRV analysis...
January 22, 2018: European Journal of Applied Physiology
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