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https://www.readbyqxmd.com/read/28018241/master-athletes-are-extending-the-limits-of-human-endurance
#1
REVIEW
Romuald Lepers, Paul J Stapley
The increased participation of master athletes (i.e., >40 years old) in endurance and ultra-endurance events (>6 h duration) over the past few decades has been accompanied by an improvement in their performances at a much faster rate than their younger counterparts. Aging does however result in a decrease in overall endurance performance. Such age-related declines in performance depend upon the modes of locomotion, event duration, and gender of the participant. For example, smaller age-related declines in cycling performance than in running and swimming have been documented...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/28011098/serum-igf-i-igfbp-3-and-als-concentrations-and-physical-performance-in-young-swimmers-during-a-training-season
#2
H Tourinho Filho, M Pires, E F Puggina, M Papoti, R Barbieri, C E Martinelli
INTRODUCTION: The GH/IGF-I axis is a system of growth mediators, receptors, and binding proteins that regulate somatic and tissue growth; and it has been shown that exercise programs are related to the anabolic function of this axis. OBJECTIVE: The aim of this study was to analyse the changes of serum IGF-I concentration and that of its binding proteins IGFBP-3 and ALS in adolescent swimmers at different stages of a training season, and compare them with physical performance parameters and body composition of the athletes...
December 18, 2016: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/27974154/in-air-versus-underwater-comparison-of-3d-reconstruction-accuracy-using-action-sport-cameras
#3
Gustavo R D Bernardina, Pietro Cerveri, Ricardo M L Barros, João C B Marins, Amanda P Silvatti
Action sport cameras (ASC) have achieved a large consensus for recreational purposes due to ongoing cost decrease, image resolution and frame rate increase, along with plug-and-play usability. Consequently, they have been recently considered for sport gesture studies and quantitative athletic performance evaluation. In this paper, we evaluated the potential of two ASCs (GoPro Hero3+) for in-air (laboratory) and underwater (swimming pool) three-dimensional (3D) motion analysis as a function of different camera setups involving the acquisition frequency, image resolution and field of view...
January 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27967270/effects-of-4-weeks-of-%C3%AE-alanine-supplementation-on-swim-performance-parameters-in-water-polo-players
#4
Gabriel Motta Pinheiro Brisola, Fabio Milioni, Marcelo Papoti, Alessandro Moura Zagatto
PURPOSE: In water polo several high-intensity efforts are performed, leading to the fatigue process due to accumulation of hydrogen ions, and thus β-alanine supplementation could be an efficient strategy to increase the intramuscular acid buffer. Therefore, the purpose of this study was to investigate whether 4 weeks of β-alanine supplementation enhances parameters related to water polo performance. METHODS: Twenty-two highly-trained male water polo players of national level were randomly assigned to receive either 28 days of β-alanine or a placebo (4...
December 14, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27965597/transcranial-direct-current-stimulation-effects-on-athletes-cognitive-performance-an-exploratory-proof-of-concept-trial
#5
Davimar M M Borducchi, July Silveira Gomes, Henrique Akiba, Quirino Cordeiro, José Henrique M Borducchi, Lívia Stocco Sanches Valentin, Gabrielle M Borducchi, Álvaro Machado Dias
Among the 2016 Olympic and Paralympic Games' unforgettable moments, one could not overlook performances by Phelps and Bolt, which challenge old premises about the maximum extension of individual supremacism in ultracompetitive modalities and the doping scandals. Different media channels resonated these two trends, with an unseen rise on discussions about traits and practices that may set ultrahigh performance athletes apart from the more ordinary ones. Yet, some key issues remain undebated. This paper aims to add to this debate, with a proof of concept trial, which investigates whether transcranial direct current stimulation (tDCS) may serve as an aid for professional athletes...
2016: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/27940620/how-to-build-a-deep-diver-the-extreme-morphology-of-mesoplodonts
#6
D Ann Pabst, William A McLellan, Sentiel A Rommel
Mesoplodont beaked whales are extreme divers, diving for over 45 mins and to depths of over 800 m. These dives are of similar depth and duration to those of the giant sperm whale (Physeter macrocephalus) whose body mass can be 50 times larger. Velten et al. (2013) provided anatomical data that demonstrated that on-board oxygen stores were sufficient to aerobically support the extreme dives of mesoplodonts if their diving metabolic rates are low. Because no physiological data yet exist, we utilized an anatomical approach-the body composition technique-to examine the relative metabolic rates of mesoplodonts...
December 2016: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/27930743/effects-of-four-weeks-of-%C3%AE-alanine-supplementation-on-repeated-sprint-ability-in-water-polo-players
#7
Gabriel Motta Pinheiro Brisola, Guilherme Giannini Artioli, Marcelo Papoti, Alessandro Moura Zagatto
The purpose of this study was to investigate the effect of four weeks of β-alanine supplementation on repeated sprint ability in water polo players. Twenty-two male water polo players participated in the study, divided randomly into two homogeneous groups (placebo and β-alanine groups). The study design was double-blind, parallel and placebo controlled. Before and after the supplementation period (28 days), the athletes performed two specific repeated sprint ability tests interspaced by a 30-minute swimming test...
2016: PloS One
https://www.readbyqxmd.com/read/27918675/biomechanics-in-paralympics-implications-for-performance
#8
Floor Morriën, Matthew J D Taylor, Florentina J Hettinga
PURPOSE: To provide an overview of biomechanical studies in Paralympic research and their relevance for performance in Paralympic sports. METHODS: Search terms ' Paralympic Biomechanics', 'Paralympic Sport Performance', 'Paralympic Athlete Performance', and Paralympic Athlete' were entered into the electronic database PubMed. RESULTS: Thirty-four studies were included. Biomechanical studies in Paralympics mainly contributed to performance enhancement by technical optimization (n=32) and/or injury prevention (n=6)...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27871205/the-effects-of-two-different-swimming-training-periodization-on-physiological-parameters-at-various-exercise-intensities
#9
Vicente Javier Clemente-Suárez, Athanasios Dalamitros, João Ribeiro, Ana Sousa, Ricardo J Fernandes, J Paulo Vilas-Boas
This study analysed the effects of two different periodization strategies on physiological parameters at various exercise intensities in competitive swimmers. Seventeen athletes of both sexes were divided to two groups, the traditional periodization (TPG, n = 7) and the reverse periodization group (RPG, n = 10). Each group followed a 10-week training period based on the two different periodization strategies. Before and after training, swimming velocity (SV), energy expenditure (EE), energy cost (EC) and percentage of aerobic (%Aer) and anaerobic (%An) energy contribution to the swimming intensities corresponding to the aerobic threshold (AerT), the anaerobic threshold (AnT) and the velocity at maximal oxygen uptake (vVO2max) were measured...
November 21, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27788589/improved-reliability-of-the-urine-lactate-concentration-under-controlled-hydration-after-maximal-exercise
#10
Stefanos Nikolaidis, Ioannis Kosmidis, Triantafullia Koulidou, Sotiris Panagakis, George Tsalis, Dimitris Loupos, Vassilis Mougios
CONTEXT: Urine lactate may be a novel biomarker of lactate production capacity but its reliability has been unsatisfactory so far. OBJECTIVE: To compare the reliability of urine lactate between controlled hydration and no hydration after maximal exercise. MATERIAL AND METHODS: Athletes performed swimming exercise four times: two followed by consumption of 1 L of water and two followed by no water intake. Blood and urine lactate was measured...
October 28, 2016: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/27766021/dehydroepiandrosterone-supplementation-combined-with-whole-body-vibration-training-affects-testosterone-level-and-body-composition-in-mice
#11
Wen-Chyuan Chen, Yi-Ming Chen, Chi-Chang Huang, Yen-Dun Tzeng
Dehydroepiandrosterone (DHEA), the most abundant sex steroid, is primarily secreted by the adrenal gland and a precursor hormone used by athletes for performance enhancement. Whole-body vibration (WBV) is a well-known light-resistance exercise by automatic adaptations to rapid and repeated oscillations from a vibrating platform, which is also a simple and convenient exercise for older adults. However, the potential effects of DHEA supplementation combined with WBV training on to body composition, exercise performance, and hormone regulation are currently unclear...
2016: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/27736252/heart-rate-recovery-after-warm-up-in-swimming-a-useful-predictor-of-training-heart-rate-response
#12
Sander P M Ganzevles, Arnold de Haan, Peter J Beek, Hein A M Daanen, Martin J Truijens
For training to be optimal, daily training load has to be adapted to the momentary status of the individual athlete, which is often difficult to establish. Therefore, the present study was performed to investigate the predictive value of heart rate recovery (HRR) during a standardized warm-up for training load. Training load was quantified by the variation in heart rate during standardized training in competitive swimmers. Eight female and five male swimmers of Dutch national level participated in the study...
October 13, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27727200/combined-strength-exercises-in-dry-land-and-in-the-water-to-improve-swimming-parameters-of-athletes-with-paraplegia
#13
Kestutis Skucas, Vaida Pokvytyte
BACKGROUND: Of the research was to examine the effects of twelve weeks of combined dry land strength and resistance swimming training for increasing upper body strength, swimming performance and stroking parameters in swimmers with paraplegia and to determine correlation between these parameters. METHODS: The preliminary, the second (after 4 weeks), the third (after 8 weeks) and the last (after 12 weeks) testing were performed. The measurements consisted of the following assessments: the assessment of isometric strength in dry land (tension force), the assessment of swimming performance and stroke parameters during 50m backstroke, the assessment of strength during tethered swimming (tension force)...
October 11, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27717653/the-time-dependence-of-the-effect-of-ischemic-preconditioning-on-successive-sprint-swimming-performance
#14
Felipe D Lisbôa, Tiago Turnes, Rogério S O Cruz, João A G Raimundo, Gustavo S Pereira, Fabrizio Caputo
OBJECTIVES: The present study aimed to determine the effects of ischemic preconditioning on performance in three successive 50-m swimming trials and to measure stroke rate, stroke length and blood lactate accumulation. DESIGN: Counterbalanced, repeated-measures cross-over study. METHODS: On two separate days, eleven competitive male swimmers (20±3 years, 182±5cm, 77±5kg) performed three successive 50-m trials in a 50-m swimming pool, preceded by intermittent bilateral cuff inflation (4× 5-min of blood flow restriction+5-min of cuff deflation) at either 220 for thighs and 180mmHg for arms (ischemic preconditioning) or 20mmHg for both limbs (control-treatment)...
September 20, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27703854/sex-differences-in-pacing-during-ultraman-hawaii
#15
Beat Knechtle, Pantelis T Nikolaidis
BACKGROUND: To date, little is known for pacing in ultra-endurance athletes competing in a non-stop event and in a multi-stage event, and especially, about pacing in a multi-stage event with different disciplines during the stages. Therefore, the aim of the present study was to examine the effect of age, sex and calendar year on triathlon performance and variation of performance by events (i.e., swimming, cycling 1, cycling 2 and running) in 'Ultraman Hawaii' held between 1983 and 2015...
2016: PeerJ
https://www.readbyqxmd.com/read/27669185/examining-fundamental-movement-competency-and-closed-chain-upper-extremity-dynamic-balance-in-swimmers
#16
Garrett S Bullock Spt, Nate Brookerson, Amy M Knab, Robert J Butler
Abnormal fundamental movement patterns and upper quarter dynamic balance are proposed mechanisms affecting athletic performance and injury risk. There are few studies investigating functional movement and closed chain upper extremity dynamic stability in swimmers. The purpose of this study was to determine differences in fundamental movement competency and closed chain upper extremity dynamic balance, utilizing the Functional Movement Screen (FMS) and Upper Quarter Y-Balance Test (YBT-UQ), of high school (HS; n=70) and collegiate (COL; n=70) swimmers...
September 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27634070/developing-and-testing-an-instrument-to-assess-aquaticity-in-humans
#17
Danae Varveri, Andreas D Flouris, Nikitas Smirnios, Elizana Pollatou, Christina Karatzaferi, Giorgos K Sakkas
We developed and validated an aquaticity assessment test (AAT) for the evaluation of human physical adequacy in the water. Forty-six volunteers (25M/21F; 20 ± 8 years) participated and performed 10 easy-to-administer and practical aquatic tasks. Group A was formed by 36 elite athletes (M/F 20/16, 24.7 ± 10yrs) from two sports categories depending on their affinity to the water environment: terrestrial (wrestling, cycling, dancing) and aquatic (swimming, synchronized swimming, free diving) sports. Group B was formed by 10 non-athlete participants (5M/5F, 14...
July 2016: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/27632832/assessment-of-body-composition-and-sport-performance-of-brazilian-paralympic-swim-team-athletes
#18
Radamés M V Medeiros, Eduardo S Alves, Valdir A Lemos, Paulo A Schwingel, Andressa da Silva, Roberto Vital, Alexandre S Vieira, Murilo M Barreto, Edilson A Rocha, Sergio Tufik, Marco T de Mello
CONTEXT: Body-composition assessments of high-performance athletes are very important for identifying physical performance potential. Although the relationship between the kinanthropometric characteristics and performance abilities of Olympic swimmers is extremely important, this subject is not completely understood for Paralympic swimmers. OBJECTIVE: To investigate the relationship between body composition and sport performance in Brazilian Paralympic swimmers 6 mo after training...
December 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27604138/performance-and-sex-differences-in-isklar-norseman-xtreme-triathlon
#19
Beat Knechtle, Pantelis Theodoros Nikolaidis, Michael Stiefel, Thomas Rosemann, Christoph Alexander Rüst
The performance and sex differences of long-distance triathletes competing in 'Ironman Hawaii' are well investigated. However, less information is available with regards to triathlon races of the Ironman distance held under extreme environmental conditions (e.g. extreme cold) such as the 'Isklar Norseman Xtreme Triathlon' which started in 2003. In 'Isklar Norseman Xtreme Triathlon', athletes swim at a water temperature of ~13-15°C, cycle at temperatures of ~5-20°C and run at temperatures of ~12-28°C in the valley and of ~2-12°C at Mt...
October 31, 2016: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/27552213/evaluation-of-the-effectiveness-of-compression-garments-on-autonomic-nervous-system-recovery-following-exercise
#20
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 ANS activity following a swimming performance. Ten young male athletes were recruited and tested in two 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 400m 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...
August 19, 2016: Journal of Strength and Conditioning Research
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