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Heart rate variability, performance, athlete

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https://www.readbyqxmd.com/read/28359608/changes-in-ventilatory-response-to-exercise-in-trained-athletes-respiratory-physiological-benefits-beyond-cardiovascular-performance
#1
Adriano di Paco, Bruno-Pierre Dubé, Pierantonio Laveneziana
INTRODUCTION: The beneficial impact of an 8-month competitive season on the ventilatory profile response to exercise in soccer players has never been evaluated. MATERIAL AND METHODS: Ventilatory profile (evaluated by determining individual tidal volume [VT] relative to minute ventilation [VE] inflection points during exercise) and metabolic responses to incremental exercise were evaluated in 2 professional soccer teams before and after an 8-month competitive season...
March 27, 2017: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/28338378/validation-of-a-maximal-incremental-skating-test-performed-on-a-slide-board-comparison-with-treadmill-skating
#2
Tatiane Piucco, Fernando Diefenthaeler, Rogério Soares, Juan M Murias, Guillaume Y Millet
PURPOSE: the aim of this study was to investigate the criterion validity of a maximal incremental skating test performed on a slide board (SB). METHODS: Twelve sub-elite speed skaters performed a maximal skating test on a treadmill and on a SB. Gas exchange threshold (GET), respiratory compensation point (RCP) and maximal variables were determined. RESULTS: oxygen uptake (V̇O2) (31.0 ± 3.2 and 31.4 ± 4.1 mL∙min(-1)∙kg(-1)), percentage of maximal oxygen uptake (V̇O2max) (66...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28240715/influence-of-environmental-conditions-on-performance-and-heart-rate-responses-to-the-30-15-incremental-fitness-test-in-rugby-union-athletes
#3
Thomas W Jones, Alex O W Natera, Jacob Jennings, Aiden J Oakley
The purpose of this study was to examine the differences in performance and heart rate responses between a high heat outdoor condition (34.0°C, 64.1% humidity) and a temperate indoor condition (22.0°C, 50.0% humidity) during the 30-15 intermittent fitness test (30-15IFT). Eight highly trained Rugby Union players (28.1 ± 1.5 years, 181.4 ± 8.8 cm, 88.4 ± 13.3kg) completed the 30-15IFT in two different temperature conditions. Dependant variables recorded and analysed included; final running speed of the 30-15IFT, heart rate (HR) at rest (HR rest), maximum HR (Max HR), HR recovery (HRR), average HR (HR ave) and sub-maximal HR corresponding to 25%, 50% and 75% of final test speed (HR 25%, HR 50% and HR 75%) and HR at 13 km·h (HR 13 km·h)...
February 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28239178/prevalence-and-characteristics-of-exercise-induced-bronchoconstriction-in-high-school-and-college-athletes-at-2-240-m-altitude
#4
Martín Becerril-Ángeles, Mario H Vargas, Leonardo Hernández-Pérez, Nancy Judith Rivera-Istepan, Rebeca Ivonne Pérez-Hidalgo, Ana Gabriela Ortega-González, Severino Rubio-Domínguez, María Cristina Rodríguez-Gutiérrez, Radamés Gaxiola-Cortés, Rodrigo Dosal-Ulloa, Laura Graciela Gochicoa-Rangel
BACKGROUND: Athletes practicing strenuous physical activities may develop exercise-induced bronchoconstriction (EIB). We aimed to determine the prevalence and features of this condition in Mexico City (altitude, 2,240 m). METHODS: In the present study, 208 high school and college athletes performed a standardized EIB test on a treadmill. RESULTS: Responses to exercise had large between-subject variability in all physiological parameters (forced expiratory volume in one second [FEV1], heart rate, blood oxygen saturation level [SpO2], blood pressure), with nearly similar proportions of subjects in whom FEV1 increased or decreased...
January 2017: Revista de Investigación Clínica; Organo del Hospital de Enfermedades de la Nutrición
https://www.readbyqxmd.com/read/28222576/may-a-unitary-autonomic-index-help-assess-autonomic-cardiac-regulation-in-elite-athletes-preliminary-observations-on-the-national-italian-olympic-committee-team
#5
Roberto Sala, Mara Malacarne, Fabio Tosi, Manuela Benzi, Nadia Solaro, Stefano Tamorri, Antonio Spataro, Massimo Pagani, Daniela Lucini
BACKGROUND: Long term endurance training, as occurring in elite athletes, is associated to cardiac neural remodeling in favor of cardioprotective vagal mechanisms, resulting in resting bradycardia and augmented contribution of cardiac parasympathetic nerve activity. Autonomic assessment can be performed by way of Heart Rate Variability. This technique however provides multiple indices, and there is not yet complete agreement on their specific significance. Purpose of the study was to assess whether a rank transformation and radar plot could provide a unitary autonomic index, capable to show a correlation between intensity of individual work and quality of autonomic regulation...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28188371/the-effect-of-functional-overreaching-on-parameters-of-autonomic-heart-rate-regulation
#6
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)...
March 2017: European Journal of Applied Physiology
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
I Garcia-Tabar, M Izquierdo, E M Gorostiaga
This study aimed to validate the use of a single blood lactate concentration measurement taken following a 5-minute 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/28149417/determination-of-aerobic-power-through-a-specific-test-for-taekwondo-a-predictive-equation-model
#10
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/28149369/the-effect-of-the-mthfr-c677t-mutation-on-athletic-performance-and-the-homocysteine-level-of-soccer-players-and-sedentary-individuals
#11
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/28102898/a-composite-autonomic-index-as-unitary-metric-for-heart-rate-variability-a-proof-of-concept
#12
Roberto Sala, Mara Malacarne, Nadia Solaro, Massimo Pagani, Daniela Lucini
BACKGROUND: This study addresses whether a unitary cardiac autonomic nervous system index (ANSI), obtained combining multiple metrics from heart rate variability (HRV) into a radar plot could provide an easy appreciation of autonomic performance in a clinical setting. MATERIALS AND METHODS: Data are standardized using percentile ranking of autonomic proxies from a relatively large reference population (n = 1593, age 39 ± 13 years). Autonomic indices are obtained from autoregressive spectral analysis of (ECG derived) HRV at rest and during standing up...
January 19, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28095075/a-pilot-study-using-entropy-as-a-non-invasive-assessment-of-running
#13
Andrew M Murray, Joong Hyun Ryu, John Sproule, Anthony P Turner, Phil Graham-Smith, Marco Cardinale
PURPOSE: Running performance is influenced by the interaction of biomechanical and physiological factors. Miniaturised accelerometers worn by the athlete can be used to quantify mechanical aspects of running and be used as a non-invasive tool to assess training status and progression. The aim of this study was to define and validate a method to assess running regularity and allow the estimation of an individual's V̇O2 and/or blood lactate [La]b based on data collected with accelerometers and heart rate (HR)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28031761/physiological-responses-during-the-time-limit-at-100-of-the-peak-velocity-in-the-carminatti-s-test-in-futsal-players
#14
Leandro Teixeira Floriano, Juliano Fernandes da Silva, Anderson Santiago Teixeira, Paulo Cesar do Nascimento Salvador, Naiandra Dittrich, Lorival José Carminatti, Lucas Loyola Nascimento, Luiz Guilherme Antonacci Guglielmo
The aim of this study was to investigate the physiological responses during the time limit at the intensity of the peak velocity of the Carminatti's test (T-CAR). Ten professional futsal players (age, 27.4 ± 5.8 years, body mass, 78.8 ± 8.5 kg, body height, 175.8 ± 6.8 cm, body fat mass, 14.1 ± 2.6%) took part in the study. The players performed three tests, with an interval of at least 48 hours, as follows: the T-CAR to determine the peak velocity and the maximal heart rate; an incremental treadmill protocol to determine the maximal physiological responses; and a time limit running test at the peak velocity reached in the T-CAR...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28031757/leukocyte-populations-are-associated-with-heart-rate-variability-after-a-triathlon
#15
Germán Hernández Cruz, José Naranjo Orellana, Adrián Rosas Taraco, Blanca Rangel Colmenero
The purpose of this study was to analyze cellular immune components and their association with heart rate variability in triathlon athletes. Twelve athletes were included (age 36.41 ± 5.57 years, body mass 81.84 ± 10.97 kg) and blood samples were taken one week before, immediately, at 2 and 48 hours, and one week after competition. Total lymphocytes and their subpopulations, neutrophils, basophils, eosinophils and monocytes were analyzed. At the same time, heart rate variability was recorded for 30 minutes using Polar Team2®...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/27959833/adaptive-spectro-temporal-filtering-for-electrocardiogram-signal-enhancement
#16
Diana Tobon Vallejo, Tiago Falk
Advances in low-cost portable electrocardiogram (ECG) devices have opened doors for numerous new applications, including fitness tracking, remote health, and peak athletic performance monitoring, to name a few. Many such devices, however, have been shown to be highly contaminated by movement and/or muscle contraction artifacts, which in turn, can lead to erroneous heart rate and heart rate variability (HRV) analyses. Here, we propose a new denoising method based on adaptive spectrotemporal filtering for ECG enhancement...
December 9, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/27877137/an-extreme-mountain-ultra-marathon-decreases-the-cost-of-uphill-walking-and-running
#17
Gianluca Vernillo, Aldo Savoldelli, Spyros Skafidas, Andrea Zignoli, Antonio La Torre, Barbara Pellegrini, Guido Giardini, Pietro Trabucchi, Grégoire P Millet, Federico Schena
Purpose: To examine the effects of the world's most challenging mountain ultramarathon (MUM, 330 km, cumulative elevation gain of +24,000 m) on the energy cost and kinematics of different uphill gaits. Methods: Before (PRE) and immediately after (POST) the competition, 19 male athletes performed three submaximal 5-min treadmill exercise trials in a randomized order: walking at 5 km·h(-1), +20%; running at 6 km·h(-1), +15%; and running at 8 km·h(-1), +10%. During the three trials, energy cost was assessed using an indirect calorimetry system and spatiotemporal gait parameters were acquired with a floor-level high-density photoelectric cells system...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27872598/futsal-match-related-fatigue-affects-running-performance-and-neuromuscular-parameters-but-not-finishing-kick-speed-or-accuracy
#18
Fabio Milioni, Luiz H P Vieira, Ricardo A Barbieri, Alessandro M Zagatto, Nikolai B Nordsborg, Fabio A Barbieri, Júlio W Dos-Santos, Paulo R P Santiago, Marcelo Papoti
Purpose: The aim of the present study was to investigate the influence of futsal match-related fatigue on running performance, neuromuscular variables, and finishing kick speed and accuracy. Methods: Ten professional futsal players participated in the study (age: 22.2 ± 2.5 years) and initially performed an incremental protocol to determine maximum oxygen uptake ([Formula: see text]: 50.6 ± 4.9 mL.kg(-1).min(-1)). Next, simulated games were performed, in four periods of 10 min during which heart rate and blood lactate concentration were monitored...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27813393/the-effect-of-a-short-term-training-period-on-physiological-parameters-and-running-performance-intensity-distribution-versus-constant-intensity-exercise
#19
Vicente J Clemente-Suárez, Athanasios A Dalamitros, Pantelis T Nikolaidis
BACKGROUND: This study compared the effect of two training strategies differing on the weekly intensity distribution on physiological parameters and running performance in moderately trained endurance athletes. METHODS: Thirty male athletes were equally divided into three groups, one following an increasing weekly aerobic intensity distribution (EXP1), one with constant weekly aerobic intensitydistribution (EXP2) and a control one, following a freely chosen program (CON)...
November 4, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27806014/a-performance-analysis-of-a-stand-up-paddle-board-marathon-race
#20
AProf Ben Schram, Prof Wayne Hing, AProf Mike Climstein, AProf James 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, 4 female) were recruited from the Stand Up Paddle Surfing Association of Australia to have their race performance in the Australian Titles analyzed...
October 28, 2016: Journal of Strength and Conditioning Research
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