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https://www.readbyqxmd.com/read/29345161/caffeine-improves-triathlon-performance-a-field-study-in-males-and-females
#1
Sunita Potgieter, Hattie H Wright, Carine Smith
The ergogenic effect of caffeine on endurance exercise is commonly accepted. We aimed to elucidate realistically the effect of caffeine on triathlon event performance using a field study design, while allowing investigation into potential mechanisms at play. A double-blind, randomized, crossover, field trial was conducted. Twenty-six triathletes (14 males, 12 females) participated (age: 37.8±10.6 years, habitual caffeine intake: 413±505 mg/day, percentage body fat: 14.5±7.2%, training/week: 12.8±4.5 hours)...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29334328/different-durations-within-the-method-of-best-practice-affect-the-parameters-of-the-speed-duration-relationship
#2
Christoph Triska, Bettina Karsten, Chris Beedie, Bernhard Koller-Zeisler, Alfred Nimmerichter, Harald Tschan
The aim of the study was to determine whether estimates of the speed-duration relationship are affected using different time-trial (TT) field-based testing protocols, where exhaustive times were located within the generally recommended durations of 2-15 min. Ten triathletes (mean ± SD age: 31.0 ± 5.7 years; height: 1.81 ± 0.05 m; body mass: 76.5 ± 6.8 kg) performed two randomly assigned field tests to determine critical speed (CS) and the total distance covered above CS (D´). CS and D´ were obtained using two different protocols comprising three TT that were interspersed by 60 min passive rest...
January 15, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29248656/myocardial-fibrosis-in-competitive-triathletes-detected-by-contrast-enhanced-cmr-correlates-with%C3%A2-exercise-induced-hypertension-and%C3%A2-competition-history
#3
Enver Tahir, Jitka Starekova, Kai Muellerleile, Alexandra von Stritzky, Julia Münch, Maxim Avanesov, Julius M Weinrich, Christian Stehning, Sebastian Bohnen, Ulf K Radunski, Eric Freiwald, Stefan Blankenberg, Gerhard Adam, Axel Pressler, Monica Patten, Gunnar K Lund
OBJECTIVES: This study analyzed the presence of myocardial fibrosis detected by late gadolinium-enhancement (LGE) cardiac magnetic resonance (CMR) in correlation with the performance of competitive triathletes objectified by an exercise test and individual competition history. BACKGROUND: Myocardial fibrosis detected by LGE CMR has been reported to occur in 0% to 50% of asymptomatic athletes. However, the cause and mechanisms of myocardial fibrosis are unclear. METHODS: Eighty-three asymptomatic triathletes undergoing >10 training h per week (43 ± 10 years of age; 65% male) and 36 sedentary controls were studied by using LGE and extracellular volume (ECV) CMR...
December 8, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29244861/reliability-of-the-parameters-of-the-power-duration-relationship-using-maximal-effort-time-trials-under-laboratory-conditions
#4
Christoph Triska, Bettina Karsten, Bernd Heidegger, Bernhard Koller-Zeisler, Bernhard Prinz, Alfred Nimmerichter, Harald Tschan
The purpose of this study was to assess the reliability of critical power (CP) and the total amount of work accomplished above CP (W´) across repeated tests using ecologically valid maximal effort time-trials (TT) under laboratory conditions. After an initial incremental exercise test, ten well-trained male triathletes (age: 28.5 ± 4.7 years; body mass: 73.3 ± 7.9 kg; height: 1.80 ± 0.07 m; maximal aerobic power [MAP]: 329 ± 41 W) performed three testing sessions (Familiarization, Test I and Test II) each comprising three TT (12, 7, and 3 min with a passive recovery of 60 min between trials)...
2017: PloS One
https://www.readbyqxmd.com/read/29232314/postexercise-fructose-maltodextrin-ingestion-enhances-subsequent-endurance-capacity
#5
Ed Maunder, Tim Podlogar, Gareth A Wallis
PURPOSE: Restoring skeletal muscle and hepatic glycogen content during short-term (<6 h) recovery from prolonged exercise is pertinent for athletes seeking to maximize performance in repeated exercise bouts. Previous research suggests co-ingestion of fructose-glucose carbohydrate sources augments hepatic and has equivalent effects on skeletal muscle glycogen storage during short-term recovery from prolonged exercise compared to isocaloric glucose ingestion. The aim of the present investigation was to determine if this has a discernible effect on subsequent exercise capacity...
December 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29231216/aronia-citrus-juice-polyphenol-rich-juice-intake-and-elite-triathlon-training-a-lipidomic-approach-using-representative-oxylipins-in-urine
#6
Libia Alejandra García-Flores, Sonia Medina, Cristina Gómez, Craig E Wheelock, Roberto Cejuela, José Miguel Martínez-Sanz, Camille Oger, Jean-Marie Galano, Thierry Durand, Álvaro Hernández-Sáez, Federico Ferreres, Ángel Gil-Izquierdo
In the present study, we examined whether particular urinary oxylipins (isoprostanes (IsoPs), leukotrienes (LTs), prostaglandins (PGs), and thromboxanes (TXs)) in 16 elite triathletes could alter during 145 days of training. Within this time span, 45 days were dedicated to examining the effects of the intake of a beverage rich in polyphenols (one serving: 200 mL per day) supplemented in their diet. The beverage was a mixture of citrus juice (95%) and Aronia melanocarpa juice (5%) (ACJ). Fifty-two oxylipins were analyzed in the urine...
December 12, 2017: Food & Function
https://www.readbyqxmd.com/read/29206785/three-weeks-of-overload-training-increases-resting-muscle-sympathetic-activity
#7
Alexandra M Coates, Anthony V Incognito, Jeremy D Seed, Connor J Doherty, Philip J Millar, Jamie F Burr
PURPOSE: Overload training is hypothesized to alter autonomic regulation, though interpretations using indirect measures of heart rate variability are conflicting. The aim of the present study was to examine the effects of overload training on muscle sympathetic nerve activity (MSNA), a direct measure of central sympathetic outflow, in recreational endurance athletes. METHODS: Measurements of heart rate variability, cardiac baroreflex sensitivity (BRS), MSNA (microneurography), and sympathetic BRS were obtained in seventeen healthy triathletes and cyclists after 1-week of reduced training (baseline) and following 3-weeks of either regular (CON, n=7) or overload (OL, n=10) training...
December 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29194049/preserving-the-shoulder-function-of-an-elite-para-triathlete-a-case-report
#8
Robert Diaz, Allison H Stoll, Monica E Rho, Cheri A Blauwet
Shoulder pain in wheelchair users that participate in competitive adaptive sports can be a troublesome condition. Shoulder pain not only affects athletic performance, but also functional activities such as wheelchair propulsion and weight bearing during transfers. Managing pain in these athletes thus presents a unique challenge due to the difficulty in achieving relative rest and the need to modify athletic shoulder-focused rehabilitation strategies. In all athletes, it is vital to establish an early, accurate diagnosis and optimize conservative treatment prior to considering surgical interventions in order to avoid excessive shoulder-related morbidity, loss of function, and worse - loss of independence...
November 29, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29182403/long-distance-triathletes-intentions-to-manipulate-energy-and-macronutrient-intake-over-a-training-macrocycle
#9
Hani Kopetschny, David Rowlands, David Popovich, Jasmine Thomson
This study explored the information sources long-distance triathletes used to inform their training and nutrition plans, and evaluated these plans over a training macrocycle. Seventy-four long-distance triathletes completed the online survey. Coaches were the most popular training information source (69%), whereas non-professional sources (internet 65%, other athletes 53%) were more popular than nutritionists (29%) for nutrition information. Attributes valued most in an information source were: source prior personal experience, individualised advice, breadth of knowledge, and credibility...
November 28, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29164497/identifying-motives-of-midlife-black-triathlete-women-using-survey-transformation-to-guide-qualitative-inquiry
#10
Candace S Brown, Kevin S Masters, Amy G Huebschmann
Demonstrating health disparities related to race, age, and gender, older Black women (BW) are the most sedentary demographic group in the United States. Increasing PA in mid-life is important, as it improves health as BW age into their later years. Advancing our understanding of the exercise motives of BW triathletes presents a "reverse engineering" opportunity to identify motives that could influence sedentary mid-life BW to increase their activity. The purposes of this study were to: (a) utilize an innovative survey transformation method to adapt a measure developed primarily in Caucasian males, i...
November 22, 2017: Journal of Cross-cultural Gerontology
https://www.readbyqxmd.com/read/29140910/polygenic-profile-and-exercise-induced-muscle-damage-by-a-competitive-half-ironman
#11
Juan Del Coso, Juan J Salinero, Beatriz Lara, César Gallo-Salazar, Francisco Areces, David Herrero, Carlos Puente
Del Coso, J, Salinero, JJ, Lara, B, Gallo-Salazar, C, Areces, F, Herrero, D, and Puente, C. Polygenic profile and exercise-induced muscle damage by a competitive half-ironman. J Strength Cond Res XX(X): 000-000, 2017-To date, it is still unknown why some individuals develop higher levels of muscle damage than other individuals, despite participating in exercise with comparable levels of physical intensity. The aim of this investigation was to analyze 7 single-nucleotide polymorphisms (SNPs) that are candidates to explain individual variations in the level of muscle damage attained during a half-ironman competition...
November 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29135637/triathlon-injuries-transitioning-from-prevalence-to-prediction-and-prevention
#12
Carolyn M Kienstra, Tristen R Asken, Jennifer D Garcia, Vanessa Lara, Thomas M Best
The Ironman triathlon began in Hawaii in 1978 with 50 participants. Since then, the race has continued to grow in popularity. Injuries are very common among triathletes. Studies have looked at the relationship between injuries and many different factors. Sex, age, and morphological characteristics, such as height, weight, and body mass index, have not been shown to correlate with injury. The association between training volume and injury has shown inconsistent results. This could be due to multiple factors in study design including definitions and evaluation of training volume...
November 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/29091469/case-study-dose-response-of-caffeine-on-20-km-handcycling-time-trial-performance-in-a-para-triathlete
#13
Terri Graham-Paulson, Claudio Perret, Victoria Goosey-Tolfrey
Caffeine's ability to influence upper-body exercise (UBE) endurance performance may be related to an individual's training status. This case study therefore aimed to investigate the ergogenic effects of caffeine dose on 20 km time trial (TT) performance of an elite male Para-triathlete (wheelchair user) (age 46 y, body mass 76.9 kg, body fat 25.4%, handcycling V̇O2peak 3.45 l·min(-1)). The athlete completed four 20 km handcycling TT's on a Cyclus II ergometer under laboratory controlled conditions following the ingestion of 2, 4 and 6 mg·kg(-1) caffeine (CAF) or placebo (PLA)...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29072032/training-induced-annual-changes-in-red-blood-cell-profile-in-highly-trained-endurance-and-speed-power-athletes
#14
Monika Ciekot-Sołtysiak, Krzysztof Kusy, Tomasz Podgórski, Jacek Zieliński
BACKGROUND: An extensive body of literature exists on the effects of training on haematological parameters, but the previous studies have not reported how hematological parameters respond to changes in training loads within consecutive phases of the training cycle in highly-trained athletes in extremely different sport disciplines. The aim of this study was to identify changes in red blood cell (RBC) profile in response to training loads in consecutive phases of the annual training cycle in highly-trained sprinters (8 men, aged 24 ± 3 years) and triathletes (6 men, aged 24 ± 4 years) who competed at the national and international level...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29071114/cracking-the-code-for-maintaining-quality-training-in-olympic-distance-triathlon-lessons-learnt-from-a-squad-of-elite-scandinavian-athletes
#15
Corrie Myburgh, Tobias Hansen, Anders Holm Beck, Eleanor Boyle
OBJECTIVE: High-quality training is a key determinant of performance in the Olympic distance triathlon and is potentially influenced by a unique array of context-specific biopsychosocial factors. Our objective was to explore and describe these factors among squad members of a university-based, elite Olympic distance triathlete developmental programme. METHOD: A qualitative investigation using a visual communication tool-assisted focus group and longitudinal semistructured individual interviews was conducted...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/28979213/taurine-a-potential-ergogenic-aid-for-preventing-muscle-damage-and-protein-catabolism-and-decreasing-oxidative-stress-produced-by-endurance-exercise
#16
Flávia G De Carvalho, Bryan S M Galan, Priscila C Santos, Kelly Pritchett, Karina Pfrimer, Eduardo Ferriolli, Marcelo Papoti, Júlio S Marchini, Ellen C de Freitas
The aim of this study was to evaluate the effects of taurine and chocolate milk supplementation on oxidative stress and protein metabolism markers, and aerobic parameters in triathletes. Methods: A double-blind, crossover study was conducted with 10 male triathletes, aged 30.9 ± 1.3 year, height 1.79 ± 0.01 m and body weight 77.45 ± 2.4 kg. Three grams of taurine and 400 ml of chocolate milk (TAUchoc), or a placebo (chocolate milk) (CHOC) was ingested post exercise for 8 weeks. Oxidative stress marker levels, and 24 h urinary nitrogen, creatinine, and urea excretion were measured before and after 8 weeks of training and supplementation with TAUchoc or CHOC...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28975231/death-and-cardiac-arrest-in-u-s-triathlon-participants-1985-to-2016-a-case-series
#17
Kevin M Harris, Lawrence L Creswell, Tammy S Haas, Taylor Thomas, Monica Tung, Erin Isaacson, Ross F Garberich, Barry J Maron
Background: Reports of race-related triathlon fatalities have raised questions regarding athlete safety. Objective: To describe death and cardiac arrest among triathlon participants. Design: Case series. Setting: United States. Participants: Participants in U.S. triathlon races from 1985 to 2016. Measurements: Data on deaths and cardiac arrests were assembled from such sources as the U...
October 17, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28975218/death-and-cardiac-arrest-in-u-s-triathletes
#18
(no author information available yet)
No abstract text is available yet for this article.
September 19, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28919863/oxygen-uptake-kinetics-is-slower-in-swimming-than-arm-cranking-and-cycling-during-heavy-intensity
#19
Ana Sousa, Fabio Borrani, Ferran A Rodríguez, Grégoire P Millet
Oxygen uptake ([Formula: see text]) kinetics has been reported to be influenced by the activity mode. However, only few studies have compared [Formula: see text]O2 kinetics between activities in the same subjects in which they were equally trained. Therefore, this study compared the [Formula: see text]O2 kinetics response to swimming, arm cranking, and cycling within the same group of subjects within the heavy exercise intensity domain. Ten trained male triathletes (age 23.2 ± 4.5 years; height 180.8 ± 8...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28918791/-periostal-avulsion-of-m-vastus-medialis-in-a-triathlete-during-competition
#20
Rikard Ohlsson, Firas Mahdi, Jens Lykkegaard Olesen
Periostal avulsion of m. vastus medialis is a very rare injury. To our knowledge, it has not previously been described, and there is no treatment algorithm. A 32-year-old male professional triathlete experienced this type of injury during a final sprint in a competition. He achieved a good functional result after treatment with an optimal rehabilitation regimen, and approximately four months after the injury he won a medal in a major international event.
September 18, 2017: Ugeskrift for Laeger
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