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https://www.readbyqxmd.com/read/27918663/comparison-of-critical-power-and-w-derived-from-two-or-three-maximal-tests
#1
Len Parker Simpson, Mehdi Kordi
PURPOSE: Typically, accessing the asymptote (Critical Power; CP) and curvature constant (W') parameters of the hyperbolic power-duration relationship requires multiple constant-power, exhaustive exercise trials, spread over several visits. However, more recently single-visit protocols and personal power meters have been used. We investigated the practicality of using a two-trial, single-visit protocol in providing reliable CP & W' estimates. METHODS: 8 trained cyclists underwent 3- and 12-min maximal exercise trials in a single session to derive (2-trial) CP & W' estimates...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27779439/comparison-of-ergometer-and-track-based-testing-in-junior-track-sprint-cyclists-implications-for-talent-identification-and-development
#2
Paul J Tofari, Stuart J Cormack, Tammie R Ebert, A Scott Gardner, Justin G Kemp
Talent identification (TID) and talent development (TDE) programmes in track sprint cycling use ergometer- and track-based tests to select junior athletes and assess their development. The purpose of this study was to assess which tests are best at monitoring TID and TDE. Ten male participants (16.2 ± 1.1 year; 178.5 ± 6.0 cm and 73.6 ± 7.6 kg) were selected into the national TID squad based on initial testing. These tests consisted of two 6-s maximal sprints on a custom-built ergometer and 4 maximal track-based tests (2 rolling and 2 standing starts) using 2 gear ratios...
October 25, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27747789/hyperoxia-extends-time-to-exhaustion-during-high-intensity-intermittent-exercise-a-randomized-crossover-study-in-male-cyclists
#3
Toshiyuki Ohya, Ryo Yamanaka, Hayato Ohnuma, Masahiro Hagiwara, Yasuhiro Suzuki
BACKGROUND: Some endurance athletes exhibit exercise-induced arterial hypoxemia during high-intensity exercise. Inhalation of hyperoxic gas during exercise has been shown to counteract this exercise-associated reduction in hemoglobin oxygen saturation (SaO2), but the effects of hyperoxic gas inhalation on performance and SaO2 during high-intensity intermittent exercise remain unclear. This study investigated the effects of hyperoxic gas inhalation on performance and SaO2 during high-intensity intermittent cycling exercise...
December 2016: Sports Medicine—Open
https://www.readbyqxmd.com/read/27713701/improvements-in-cycling-time-trial-performance-are-not-sustained-following-the-acute-provision-of-challenging-and-deceptive-feedback
#4
Hollie S Jones, Emily L Williams, David Marchant, S Andy Sparks, Craig A Bridge, Adrian W Midgley, Lars R Mc Naughton
The provision of performance-related feedback during exercise is acknowledged as an influential external cue used to inform pacing decisions. The provision of this feedback in a challenging or deceptive context allows research to explore how feedback can be used to improve performance and influence perceptual responses. However, the effects of deception on both acute and residual responses have yet to be explored, despite potential application for performance enhancement. Therefore, this study investigated the effects of challenging and deceptive feedback on perceptual responses and performance in self-paced cycling time trials (TT) and explored whether changes in performance are sustained in a subsequent TT following the disclosure of the deception...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27632247/performance-relationships-in-timed-and-mass-start-events-for-elite-omnium-cyclists
#5
Kathryn E Phillips, Will G Hopkins
PURPOSE: To explore the extent to which factors that determine performance transfer within and between time-trial and mass-start events in the track-cycling Omnium. METHODS: Official finish rank in the three time-trial events, in the three mass-start events, and in the competition overall were collated in 20 international Omnium competitions between 2010 and 2014 for 196 male and 140 female cyclists. Linear mixed modelling of the log-transformed finish time for the time-trial events and of log-transformed finish rank for all events and final rank provided estimates of within-athlete race-to-race changes in performance and average between-athlete differences across a season...
September 15, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27618339/the-effect-of-maximal-explosive-strength-training-on-performance-indicators-in-cyclists
#6
Kris Beattie, Brian P Carson, Mark Lyons, Ian C Kenny
Cycling economy (CE), power at maximal oxygen uptake (WV̇O2max) and anaerobic function (i.e. sprinting ability) are considered to be the best physiological performance indicators in elite road cyclists. In addition to cardiovascular function, these physiological indicators are partly dictated by neuromuscular factors. One technique to improve neuromuscular function in athletes is through strength training. The aim of this study was to investigate the effect of a 20 week maximal- and explosive-strength training intervention on strength (maximal- , explosive-strength & bike-specific explosive-strength), WV̇O2max, CE and body composition (body mass, fat & lean mass) in cyclists...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27614882/markers-of-biological-stress-in-response-to-a-single-session-of-high-intensity-interval-training-and-high-volume-training-in-young-athletes
#7
Yvonne Kilian, Florian Engel, Patrick Wahl, Silvia Achtzehn, Billy Sperlich, Joachim Mester
PURPOSE: The aim of the present study was to compare the effects of high-intensity interval training (HIIT) vs high-volume training (HVT) on salivary stress markers [cortisol (sC), testosterone (sT), alpha-amylase (sAA)], metabolic and cardiorespiratory response in young athletes. METHODS: Twelve young male cyclists (14 ± 1 years; 57.9 ± 9.4 mL min(-1) kg(-1) peak oxygen uptake) performed one session of HIIT (4 × 4 min intervals at 90-95 % peak power output separated by 3 min of active rest) and one session of HVT (90 min constant load at 60 % peak power output)...
September 10, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27559318/cycling-in-the-absence-of-task-related-feedback-effects-on-pacing-and-performance
#8
Benjamin L M Smits, Remco C J Polman, Bert Otten, Gert-Jan Pepping, Florentina J Hettinga
INTRODUCTION: To achieve personal goals in exercise task completion, exercisers have to regulate, distribute, and manage their effort. In endurance sports, it has become very commonplace for athletes to consult task-related feedback on external devices to do so. The aim of the present study was to explore the importance of the presence of this information by examining the influence of the absence of commonly available task-related feedback on effort distribution and performance in experienced endurance athletes...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27556488/comparison-of-watermelon-and-carbohydrate-beverage-on-exercise-induced-alterations-in-systemic-inflammation-immune-dysfunction-and-plasma-antioxidant-capacity
#9
R Andrew Shanely, David C Nieman, Penelope Perkins-Veazie, Dru A Henson, Mary P Meaney, Amy M Knab, Lynn Cialdell-Kam
Consuming carbohydrate- and antioxidant-rich fruits during exercise as a means of supporting and enhancing both performance and health is of interest to endurance athletes. Watermelon (WM) contains carbohydrate, lycopene, l-citrulline, and l-arginine. WM may support exercise performance, augment antioxidant capacity, and act as a countermeasure to exercise-induced inflammation and innate immune changes. Trained cyclists (n = 20, 48 ± 2 years) participated in a randomized, placebo controlled, crossover study...
August 22, 2016: Nutrients
https://www.readbyqxmd.com/read/27445857/influence-of-prior-intense-exercise-and-cold-water-immersion-in-recovery-for-performance-and-physiological-response-during-subsequent-exercise
#10
Peter M Christensen, Jens Bangsbo
Athletes in intense endurance sports (e.g., 4000-m track cycling) often perform maximally (~4 min) twice a day due to qualifying and finals being placed on the same day. The purpose of the present study was to evaluate repeated performance on the same day in a competitive setting (part A) and the influence from prior intense exercise on subsequent performance and physiological response to moderate and maximal exercise with and without the use of cold water immersion (CWI) in recovery (part B). In part A, performance times during eight World championships for male track cyclists were extracted from the qualifying and final races in 4000-m individual pursuit...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27430501/ketone-bodies-and-exercise-performance-the-next-magic-bullet-or-merely-hype
#11
Philippe J M Pinckaers, Tyler A Churchward-Venne, David Bailey, Luc J C van Loon
Elite athletes and coaches are in a constant search for training methods and nutritional strategies to support training and recovery efforts that may ultimately maximize athletes' performance. Recently, there has been a re-emerging interest in the role of ketone bodies in exercise metabolism, with considerable media speculation about ketone body supplements being routinely used by professional cyclists. Ketone bodies can serve as an important energy substrate under certain conditions, such as starvation, and can modulate carbohydrate and lipid metabolism...
July 18, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27423721/a-case-of-endofibrosis-presenting-with-embolic-symptoms-in-a-43-year-old-cyclist
#12
C DeCarlo, E L Spangler, J Stableford
OBJECTIVES: Endofibrosis is a rare clinical entity that usually manifests as claudication in cyclists and other endurance athletes. We report a case of a 43-year-old cyclist presenting with pain and cyanosis of his toes due to an embolism to his left anterior tibial artery. The source of the embolism was found to be an ulcerated, endofibrotic plaque in his left common femoral artery. METHODS: We performed an extensive literature search using the Pubmed database and identified 60 results on endofibrosis...
July 13, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27408608/a-systematic-review-and-meta-analysis-of-carbohydrate-benefits-associated-with-randomized-controlled-competition-based-performance-trials
#13
Martin Pöchmüller, Lukas Schwingshackl, Paolo C Colombani, Georg Hoffmann
BACKGROUND: Carbohydrate supplements are widely used by athletes as an ergogenic aid before and during sports events. The present systematic review and meta-analysis aimed at synthesizing all available data from randomized controlled trials performed under real-life conditions. METHODS: MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials were searched systematically up to February 2015. Study groups were categorized according to test mode and type of performance measurement...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27347999/slow-absorbing-modified-starch-before-and-during-prolonged-cycling-increases-fat-oxidation-and-gastrointestinal-distress-without-changing-performance
#14
Daniel A Baur, Fernanda de C S Vargas, Christopher W Bach, Jordan A Garvey, Michael J Ormsbee
While prior research reported altered fuel utilization stemming from pre-exercise modified starch ingestion, the practical value of this starch for endurance athletes who consume carbohydrates both before and during exercise is yet to be examined. The purpose of this study was to determine the effects of ingesting a hydrothermally-modified starch supplement (HMS) before and during cycling on performance, metabolism, and gastrointestinal comfort. In a crossover design, 10 male cyclists underwent three nutritional interventions: (1) a commercially available sucrose/glucose supplement (G) 30 min before (60 g carbohydrate) and every 15 min during exercise (60 g∙h(-1)); (2) HMS consumed at the same time points before and during exercise in isocaloric amounts to G (Iso HMS); and (3) HMS 30 min before (60 g carbohydrate) and every 60 min during exercise (30 g·h(-1); Low HMS)...
June 25, 2016: Nutrients
https://www.readbyqxmd.com/read/27322318/dietary-recommendations-for-cyclists-during-altitude-training
#15
REVIEW
Małgorzata Michalczyk, Miłosz Czuba, Grzegorz Zydek, Adam Zając, Józef Langfort
The concept of altitude or hypoxic training is a common practice in cycling. However, several strategies for training regimens have been proposed, like "live high, train high" (LH-TH), "live high, train low" (LH-TL) or "intermittent hypoxic training" (IHT). Each of them combines the effect of acclimatization and different training protocols that require specific nutrition. An appropriate nutrition strategy and adequate hydration can help athletes achieve their fitness and performance goals in this unfriendly environment...
2016: Nutrients
https://www.readbyqxmd.com/read/27190476/comparison-of-body-composition-heart-rate-variability-aerobic-and-anaerobic-performance-between-competitive-cyclists-and-triathletes
#16
Erşan Arslan, Dicle Aras
[Purpose] The aim of this study was to compare the body composition, heart rate variability, and aerobic and anaerobic performance between competitive cyclists and triathletes. [Subjects] Six cyclists and eight triathletes with experience in competitions voluntarily participated in this study. [Methods] The subjects' body composition was measured with an anthropometric tape and skinfold caliper. Maximal oxygen consumption and maximum heart rate were determined using the incremental treadmill test. Heart rate variability was measured by 7 min electrocardiographic recording...
April 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27124720/effects-of-exhaustive-aerobic-exercise-on-tryptophan-kynurenine-metabolism-in-trained-athletes
#17
Barbara Strasser, Daniela Geiger, Markus Schauer, Hannes Gatterer, Martin Burtscher, Dietmar Fuchs
Exhaustive exercise can cause a transient depression of immune function. Data indicate significant effects of immune activation cascades on the biochemistry of monoamines and amino acids such as tryptophan. Tryptophan can be metabolized through different pathways, a major route being the kynurenine pathway, which is often systemically up-regulated when the immune response is activated. The present study was undertaken to examine the effect of exhaustive aerobic exercise on biomarkers of immune activation and tryptophan metabolism in trained athletes...
2016: PloS One
https://www.readbyqxmd.com/read/27083403/ventilatory-efficiency-and-breathing-pattern-in-world-class-cyclists-a-three-year-observational-study
#18
Eduardo Salazar-Martínez, Nicolás Terrados, Martin Burtscher, Alfredo Santalla, José Naranjo Orellana
The purpose of this three-year observational study was to analyze the ventilatory efficiency and breathing pattern in world-class professional cyclists. Twelve athletes (22.61±3.8years; 177.38±5.5cm; 68.96±5.5kg and VO2max 75.51±3.3mLkg(-1)min(-1)) were analyzed retrospectively. For each subject, respiratory and performance variables were recorded during incremental spiroergometry: oxygen uptake (VO2), carbon dioxide output (VCO2), pulmonary ventilation (VE), tidal volume (Vt), breathing frequency (fR), driving (Vt/Ti), timing (Ti/Ttot), peak power output (PPO) and maximum oxygen uptake (VO2max)...
July 15, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/27080464/sex-difference-in-draft-legal-ultra-distance-events-a-comparison-between-ultra-swimming-and-ultra-cycling
#19
Lejla Salihu, Christoph Alexander Rüst, Thomas Rosemann, Beat Knechtle
Recent studies reported that the sex difference in performance in ultra-endurance sports such as swimming and cycling changed over the years. However, the aspect of drafting in draft-legal ultra-endurance races has not yet been investigated. This study investigates the sex difference in ultra-swimming and ultra-cycling draft-legal races where drafting - swimming or cycling behind other participants to save energy and have more power at the end of the race to overtake them, is allowed. The change in performance of the annual best and the annual three best in an ultra-endurance swimming race (16-km 'Faros Swim Marathon') over 38 years and in a 24-h ultra-cycling race ('World Cycling Race') over 13 years were compared and analysed with respect to sex difference...
April 30, 2016: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/27068517/effects-of-increased-muscle-strength-and-muscle-mass-on-endurance-cycling-performance
#20
Iñigo Mujika, Bent R Rønnestad, David T Martin
Despite early and ongoing debate among athletes, coaches, and sport scientists, it is likely that resistance training for endurance cyclists can be tolerated, promotes desired adaptations that support training, and can directly improve performance. Lower-body heavy strength training performed in addition to endurance-cycling training can improve both short- and long-term endurance performance. Strength-maintenance training is essential to retain strength gains during the competition season. Competitive female cyclists with greater lower-body lean mass (LBLM) tend to have ~4-9% higher maximum mean power per kg LBLM over 1 s to 10 min...
April 2016: International Journal of Sports Physiology and Performance
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