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https://www.readbyqxmd.com/read/29760574/seasonal-variations-in-body-composition-maximal-oxygen-uptake-and-gas-exchange-threshold-in-cross-country-skiers
#1
Metin Polat, Selcen Korkmaz Eryılmaz, Sami Aydoğan
Introduction: In order to ensure that athletes achieve their highest performance levels during competitive seasons, monitoring their long-term performance data is crucial for understanding the impact of ongoing training programs and evaluating training strategies. The present study was thus designed to investigate the variations in body composition, maximal oxygen uptake (VO2max ), and gas exchange threshold values of cross-country skiers across training phases throughout a season. Materials and methods: In total, 15 athletes who participate in international cross-country ski competitions voluntarily took part in this study...
2018: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/29745773/muscle-oxygenation-rather-than-vo-2-max-is-a-strong-predictor-of-performance-in-sprint-canoe-kayak
#2
Myriam Paquette, François Bieuzen, François Billaut
PURPOSE: This study aimed to characterize the relationships between muscle oxygenation and performance during on- and off-water tests in highly trained sprint canoe-kayak athletes. METHODS: Thirty athletes (19 kayakers and 11 canoeists) performed a maximal incremental test on a canoe or kayak ergometer for determination of VO2max and examination of the relation between peak power output (PPO) and physiological parameters. A subset of 21 athletes also performed a 200-m and a 500-m (for women) or 1000-m (for men) on-water time trials...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29745735/time-trial-performance-in-elite-speed-skaters-after-remote-ischemic-preconditioning
#3
Philippe Richard, François Billaut
PURPOSE: Speed skating leads to blood-flow restriction and deoxygenation in the lower limbs (especially the right leg) that may affect performance. Although the acute influence of such deoxygenation is not clearly understood, we tested whether remote ischemic preconditioning (RIPC) could modify muscular oxygenation and improve time-trial performance in that sport. METHODS: Using a randomized, single-blind, placebo-controlled, crossover design, 9 elite speed skaters performed 1000-m on-ice time-trials preceded by either RIPC of the upper limbs (3x5-min compression/5-min reperfusion cycles at 30 mmHg > arterial systolic pressure) or SHAM (10 mmHg)...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29740559/comparison-of-special-judo-fitness-test-and-dynamic-and-isometric-judo-chin-up-tests-performance-and-classificatory-tables-development-for-cadet-and-junior-athletes
#4
Marcus Fábio Agostinho, José Alfredo Olivio Junior, Nemanja Stankovic, Raquel Escobar-Molina, Emerson Franchini
The aims of this work were to compare the performances of male and female cadet and junior judo athletes and to develop classificatory tables to these judo-specific tests for international-level from these ages. Data collected during training camps of male and female cadet and junior judo teams from three nations (Brazil, Serbia, and Spain) were analyzed, totalizing 252 individual results of special judo fitness test (SJFT), and 222 and 208 of dynamic and isometric judogi chin-up tests, respectively. Juniors performed better than cadets in the SJFT, with higher number of throws in A, B, C, and total ( P <0...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29701123/cardiodynamicsgram-a-novel-tool-for-monitoring-cardiac-function-in-exercise-training
#5
Xu Wen, Bokai Guo, Yinglan Gong, Ling Xia, Jie Yu
This study evaluated the feasibility of cardiodynamicsgram (CDG) for monitoring the cardiac functions of athletes and exercisers. CDG could provide an effective, simple, and economical tool for exercise training. Seventeen middle-distance race athletes aged 14-28 years old were recruited. CDG tests and blood test including creatine kinase (CK), CK-MB isoenzyme, and high-sensitivity troponin I (hsTnI) were performed before a high-intensity prolonged training, as well as 2 and 14 h after training, respectively...
April 27, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29686813/resting-sympatho-vagal-balance-is-related-to-10-km-running-performance-in-master-endurance-athletes
#6
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/29666559/assessing-performance-in-pre-season-wrestling-athletes-using-biomarkers
#7
Ionas Papassotiriou, Artemissia-Phoebe Nifli
Introduction: Although regular training introduces the desired changes in athletes' metabolism towards optimal final performance, literature is rarely focusing on the metabolic responses off-competition. Therefore, the aim of this study was to evaluate biochemical indices during typical preseason training in wrestling athletes. Materials and methods: Twenty male freestyle and Greco-roman wrestlers (14 to 31 years) followed a typical session of the preparatory phase...
June 15, 2018: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
https://www.readbyqxmd.com/read/29651858/sleep-related-issues-for-recovery-and-performance-in-athletes
#8
Sarah Kölling, Rob Duffield, Daniel Erlacher, Ranel Venter, Shona L Halson
The body of research that reports the relevance of sleep in high-performance sports is growing steadily. While the identification of sleep cycles and diagnosis of sleep disorders is limited to lab-based assessment via polysomnography, the development of activity-based devices estimating sleep patterns provides greater insight into the sleep behaviour of athletes in ecological settings. Overall, small sleep quantity and/or poor quality appears to exist in many athletic populations, though this may be related to training and competition context...
April 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29618981/influence-of-endurance-training-during-childhood-on-total-hemoglobin-mass
#9
Nicole Prommer, Nadine Wachsmuth, Ina Thieme, Christian Wachsmuth, Erica M Mancera-Soto, Andreas Hohmann, Walter F J Schmidt
Elite endurance athletes are characterized by markedly increased hemoglobin mass (Hbmass). It has been hypothesized that this adaptation may occur as a response to training at a very young age. Therefore, the aim of this study was to monitor changes in Hbmass in children aged 8-14 years following systematic endurance training. In the first study, Hbmass, VO2max, and lean body mass (LBM) were measured in 17 endurance-trained children (13 boys and 4 girls; aged 9.7 ± 1.3 years; training history 1.5±1.8 years; training volume 3...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29611324/validation-of-a-novel-wearable-wireless-technology-to-estimate-oxygen-levels-and-lactate-threshold-power-in-the-exercising-muscle
#10
Parisa Farzam, Zack Starkweather, Maria A Franceschini
There is a growing interest in monitoring muscle oxygen saturation (SmO2 ), which is a localized measure of muscle oxidative metabolism and can be acquired continuously and noninvasively using near-infrared spectroscopy (NIRS) methods. Most NIRS systems are cumbersome, expensive, fiber coupled devices, with use limited to lab settings. A novel, low cost, wireless, wearable has been developed for use in athletic training. In this study, we evaluate the advantages and limitations of this new simple continuous-wave (CW) NIRS device with respect to a benchtop, frequency-domain near-infrared spectroscopy (FDNIRS) system...
April 2018: Physiological Reports
https://www.readbyqxmd.com/read/29599725/validity-and-reliability-of-10-hz-global-positioning-system-to-assess-in-line-movement-and-change-of-direction
#11
Pantelis T Nikolaidis, Filipe M Clemente, Cornelis M I van der Linden, Thomas Rosemann, Beat Knechtle
The objectives of the present study were to examine the validity and reliability of the 10 Hz Johan GPS unit in assessing in-line movement and change of direction. The validity was tested against the criterion measure of 200 m track-and-field (track-and-field athletes, n = 8) and 20 m shuttle run endurance test (female soccer players, n = 20). Intra-unit and inter-unit reliability was tested by intra-class correlation coefficient (ICC) and coefficient of variation (CV), respectively. An analysis of variance examined differences between the GPS measurement and five laps of 200 m at 15 km/h, and t -test examined differences between the GPS measurement and 20 m shuttle run endurance test...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29589291/modelling-movement-energetics-using-global-positioning-system-devices-in-contact-team-sports-limitations-and-solutions
#12
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/29584530/monitoring-training-load-recovery-and-performance-of-brazilian-professional-volleyball-players-during-a-season
#13
Paula B Debien, Marcelly Mancini, Danilo R Coimbra, Daniel G S de Freitas, Renato Miranda, Maurício G Bara Filho
PURPOSE: The aim of this study is to describe and analyze the distribution of internal training load (ITL), recovery, and physical performance of professional volleyball players throughout one season. METHODS: 15 male professional Brazilian volleyball players participated in this study. The session rating of perceived exertion (session-RPE) and Total Quality Recovery (TQR) score were collected daily for 36 weeks. The session-RPE was collected after each training session and the TQR before the first session of the day...
March 27, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29575042/monitoring-morphologic-changes-in-male-rowers-using-limited-portable-echocardiography-performed-by-a-frontline-physician
#14
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/29566543/beetroot-based-gel-supplementation-improves-handgrip-strength-forearm-muscle-o2-saturation-but-not-exercise-tolerance-and-blood-volume-in-jiu-jitsu-athletes
#15
Gustavo Vieira de Oliveira, Luiz Nascimento, Mônica Volino-Souza, Jacilene Mesquita, Thiago Alvares
The ergogenic effect of beetroot on the exercise performance of trained cyclists, runners, kayakers, and swimmers has been demonstrated. However, whether or not beetroot supplementation presents a beneficial effect on the exercise performance of jiu-jitsu athletes (JJA) remains inconclusive. Therefore, present study assessed the effect of beetroot-based gel (BG) supplementation on maximal voluntary contraction (MVC), exercise time until fatigue (ETF), muscle O2 saturation (SmO2), blood volume (tHb), and plasma nitrate and lactate in response to handgrip isotonic exercise (HIE) in JJA...
March 22, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29543071/factors-that-influence-the-rating-of-perceived-exertion-after-endurance-training
#16
Lilian Roos, Wolfgang Taube, Carolin Tuch, Klaus Michael Frei, Thomas Wyss
PURPOSE: Session rating of perceived exertion (sRPE) is an often used measure to assess athletes' training load. However, little is known which factors could optimize the quality of data collection thereof. The aim of the present study was to investigate the effects of (i) the survey methods and (ii) the time points when sRPE was assessed on the correlation between subjective (sRPE) and objective (heart rate training impulse; TRIMP) assessment of training load. METHODS: In the first part, 45 well-trained subjects (30 men, 15 women) performed 20 running sessions with a heart rate monitor and reported sRPE 30 minutes after training cessation...
March 15, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29543069/multidimensional-monitoring-of-recovery-status-and-implications-for-performance
#17
Jahan Heidari, Jürgen Beckmann, Maurizio Bertollo, Michel Brink, Wolfgang Kallus, Claudio Robazza, Michael Kellmann
Monitoring of recovery in the context of athletic performance has gained significant importance during recent years. As a systematic process of data collection and evaluation, the monitoring of recovery can be implemented for various purposes. It may aid to prevent negative outcomes of training or competition, such as underrecovery, overtraining, or injuries. Further, it aims at establishing routines and strategies necessary to guarantee athletes' readiness for performance by restoring their depleted resources...
March 15, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29541343/evaluating-energy-expenditure-estimated-by-wearable-technology-during-variable-intensity-activity-on-female-collegiate-athletes
#18
Monica Taylor, Elizabeth F Nagle, Fredric L Goss, Elaine N Rubinstein, Andrew Simonson
Monitoring an athlete's energy intake and energy expenditure (EE) is an important consideration of nutritional planning for sport conditioning and peak performance. In order to provide appropriate recommendations regarding nutritional requirements and caloric needs, an accurate determination of energy requirements is necessary. By knowing an individual's EE, a coach, athletic performance staff or trainer can effectively determine training loads and volumes necessary for periodization and seasonal planning for a particular sport...
2018: International Journal of Exercise Science
https://www.readbyqxmd.com/read/29490594/post-activation-potentiation-pap-in-endurance-sports-a-review
#19
Daniel Boullosa, Sebastian Del Rosso, David G Behm, Carl Foster
While there is strong support of the usefulness of post-activation potentiation (PAP) phenomenon in power demanding sports, the role that PAP could play in endurance sports has received less attention. The aim of this review is to present evidence for a better understanding of PAP in endurance athletes; and to discuss the physiological basis and methodological aspects necessary for better practices and designing further studies. A search for relevant articles on PAP and endurance trained athletes was carried out using Medline and ISI Web of Knowledge databases...
March 1, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29489733/reliability-and-sensitivity-of-neuromuscular-and-perceptual-fatigue-measures-in-collegiate-men-s-basketball
#20
Toby Edwards, Tania Spiteri, Benjamin Piggott, Joshua Bonhotal, G Gregory Haff, Christopher Joyce
The purpose of this study was to establish the reliability and sensitivity of a countermovement jump (CMJ) and perceptual wellness questionnaire in NCAA Division I men's basketball players. Twelve male collegiate basketball athletes completed 3 maximal CMJ's on a portable force plate and a customized perceptual wellness questionnaire prior to training on non-consecutive days. CMJ variables were derived from computer software and used in analysis. All CMJ variables expressed acceptable trial-to-trial reliability (CV < 8%) except eccentric duration (CV = 8...
February 27, 2018: Journal of Strength and Conditioning Research
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