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https://www.readbyqxmd.com/read/28644716/the-effects-of-acute-carbohydrate-and-caffeine-feeding-strategies-on-cycling-efficiency
#1
Matthew Cole, James G Hopker, Jonathan D Wiles, Damian A Coleman
To assess the effect of carbohydrate and caffeine on gross efficiency (GE), 14 cyclists (V̇O2max 57.6 ± 6.3 ml.kg(-1.)min(-1)) completed 4 × 2-hour tests at a submaximal exercise intensity (60% Maximal Minute Power). Using a randomized, counter-balanced crossover design, participants consumed a standardised diet in the 3-days preceding each test and subsequently ingested either caffeine (CAF), carbohydrate (CHO), caffeine+carbohydrate (CAF+CHO) or water (W) during exercise whilst GE and plasma glucose were assessed at regular intervals (~30 mins)...
June 23, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28640685/understanding-and-improving-arterial-roads-to-support-public-health-and-transportation-goals
#2
Carolyn McAndrews, Keshia M Pollack, David Berrigan, Andrew L Dannenberg, Ed J Christopher
Arterials are types of roads designed to carry high volumes of motorized traffic. They are an integral part of transportation systems worldwide and exposure to them is ubiquitous, especially in urban areas. Arterials provide access to diverse commercial and cultural resources, which can positively influence community health by supporting social cohesion as well as economic and cultural opportunities. They can negatively influence health via safety issues, noise, air pollution, and lack of economic development...
June 22, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28624688/relation-between-peak-power-output-in-sprint-cycling-and-maximum-voluntary-isometric-torque-production
#3
Mehdi Kordi, Stuart Goodall, Paul Barratt, Nicola Rowley, Jonathan Leeder, Glyn Howatson
From a cycling paradigm, little has been done to understand the relationships between maximal isometric strength of different single joint lower body muscle groups and their relation with, and ability to predict PPO and how they compare to an isometric cycling specific task. The aim of this study was to establish relationships between maximal voluntary torque production from isometric single-joint and cycling specific tasks and assess their ability to predict PPO. Twenty male trained cyclists participated in this study...
June 10, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28617345/examining-associations-of-environmental-characteristics-with-recreational-cycling-behaviour-by-street-level-strava-data
#4
Yeran Sun, Yunyan Du, Yu Wang, Liyuan Zhuang
Policymakers pay much attention to effectively increasing frequency of people's cycling in the context of developing sustainable and green cities. Investigating associations of environmental characteristics and cycling behaviour could offer implications for changing urban infrastructure aiming at encouraging active travel. However, earlier examinations of associations between environmental characteristics and active travel behaviour are limited by low spatial granularity and coverage of traditional data. Crowdsourced geographic information offers an opportunity to determine the fine-grained travel patterns of people...
June 15, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28617132/rcn-congress-discusses-whether-wearing-helmets-should-be-compulsory-for-cyclists
#5
(no author information available yet)
Nurses at RCN congress debated whether cycle helmets should be made compulsory.
June 15, 2017: Emergency Nurse: the Journal of the RCN Accident and Emergency Nursing Association
https://www.readbyqxmd.com/read/28615044/comparison-of-transportation-related-injury-mechanisms-and-outcome-of-young-road-users-and-adult-road-users-a-retrospective-analysis-on-24-373-patients-derived-from-the-traumaregister-dgu-%C3%A2
#6
Thomas Brockamp, Uli Schmucker, Rolf Lefering, Manuel Mutschler, Arne Driessen, Christian Probst, Bertil Bouillon, Paola Koenen
BACKGROUND: Most young people killed in road crashes are known as vulnerable road users. A combination of physical and developmental immaturity as well as inexperience increases the risk of road traffic accidents with a high injury severity rate. Understanding injury mechanism and pattern in a group of young road users may reduce morbidity and mortality. This study analyzes injury patterns and outcomes of young road users compared to adult road users. The comparison takes into account different transportation related injury mechanisms...
June 14, 2017: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
https://www.readbyqxmd.com/read/28605609/effects-of-macro-and-micro-nutrients-on-exercise-induced-hepcidin-response-in-highly-trained-endurance-athletes
#7
Dylan Timothy Dahlquist, Trent Stellingwerff, Brad Pendleton Dieter, Donald C McKenzie, Michael S Koehle
Iron deficiency (ID) has ergolytic effects on athletic performance. Exercise induced inflammation impedes iron absorption in the digestive tract by up-regulating the expression of the iron regulatory protein, hepcidin. Limited research indicates the potential of specific macro- and micro- nutrients on blunting exercise induced hepcidin. Therefore, we investigated the effects of post-exercise supplementation with protein and carbohydrate (CHO) and vitamins D3 and K2 on the post-exercise hepcidin response. Ten highly-trained male cyclists (age: 26...
June 12, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28605253/pre-cooling-with-crushed-ice-is-as-effective-as-heat-acclimation-at-improving-cycling-time-trial-performance-in-the-heat
#8
Matthew Zimmermann, Grant J Landers, Karen E Wallman, Georgina Kent
This study compared pre-cooling (ice ingestion) with heat acclimation training on cycling time trial (CTT) performance in the heat. Fifteen male cyclists/triathletes completed two 800 kJ cycle time trials in the heat, with a 12-day training program in between. Initially, all participants consumed 7 g·kg(-1) of water (22°C) in 30 min, prior to completing an 800 kJ CTT in hot, humid conditions (pre-CTT) (35°C, 50% relative humidity; RH). Participants were then split into two groups, pre-cooling (n=7): trained in thermoneutral conditions then underwent pre-cooling with ice ingestion (7 g·kg(-1),1°C) prior to the final CTT (post-CTT), heat acclimation (n=8): trained in hot conditions (35°C, 50% RH) and consumed water (7 g·kg(-1)) prior to post-CTT...
June 12, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28605248/noncircular-chainrings-do-not-influence-maximum-cycling-power
#9
Chee-Hoi Leong, Steven J Elmer, James C Martin
Noncircular chainrings could increase cycling power by prolonging the powerful leg extension/flexion phases, and curtailing the low-power transition phases. We compared maximal cycling power-pedaling rate relationships, and joint-specific kinematics and powers across three chainring eccentricities (CON=1.0; LOWecc=1.13; HIGHecc=1.24). Part I: Thirteen cyclists performed maximal inertial-load cycling under three chainring conditions. Maximum cycling power and optimal pedaling rate were determined. Part II: Ten cyclists performed maximal isokinetic cycling (120rpm) under the same three chainring conditions...
June 12, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28605210/pacing-strategy-during-simulated-mountain-bike-racing
#10
Bruno Ferreira Viana, Flávio Oliveira Pires, Allan Inoue, Tony Meireles Santos
Cross-country mountain biking (XCO) is a popular high-intensity cycling endurance event, however, XCO pacing strategy has not been fully examined. This study examined the pacing strategies of different XCO athletes, during a laboratory-simulated XCO performance test. Brazilian cyclists classified as performance cohort level three (PL3-trained) performed an XCO race simulation. The simulation consisted of four 10 km laps with a gradient of 0-10%. No group vs. time interaction was found in lap time (P = 0.169), absolute (P = 0...
June 12, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28598803/bicycle-and-helmet-use-of-adolescents-in-markham-canada
#11
Michael Borean, Stephanie Ho, Drew Hollenberg, Tharani Anpalagan, Anna Rzepka, Jaclyn Viehweger, Christopher Ho, Isaac Rigby, Ronald Chow
Bicycle crashes are the second most common sports- or recreation-associated cause of serious injury. While the literature suggests that wearing protective helmets can significantly decrease risks associated with bicycle-related injuries, overall helmet use remains sub-optimal. A recent study by Chow et al. suggested that helmet-wearing rates in adolescent boys are negatively correlated with age. The aim of this study was to determine if similar trends are observed in a co-educational high school setting. A questionnaire was circulated at Unionville High School, a co-ed public high school in Markham, Canada...
June 9, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/28597621/hemodynamic-adaptation-to-training-in-visually-impaired-professional-tandem-cyclists
#12
Anna M Kamelska, Krzysztof L Mazurek, Jacek J Nowakowski
BACKGROUND: Cycling is one of the disciplines with the greatest training-induced volumetric changes in cardiovascular systems. The aim of the study was to evaluate the hemodynamic adaptation to 7-month routine training in athletes with and without severe visual impairment. METHODS: The study involved 26 men: visually impaired (VI) (n = 13; 37±12.2 years) and properly sighted (PS) (n = 13; 41±12.8 years) elite tandem-cycling athletes. They underwent hemodynamic variables monitoring at rest and during exercise test by impedance cardiography (ICG), before (in the middle of the transition period) and after 7-month cycling training (at the beginning of the competitive period)...
June 8, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28581829/features-of-fatal-injuries-in-older-cyclists-in-vehicle-bicycle-accidents-in-japan
#13
Yasuhiro Matsui, Shoko Oikawa, Masahito Hitosugi
OBJECTIVE: The purpose of this study was to identify and better understand the features of fatal injuries in cyclists aged 75 years and over involved in collisions with either hood- or van-type vehicles. METHODS: This study investigated the fatal injuries of cyclists aged 75 years old and over by analyzing accident data. We focused on the body regions in which the fatal injury occurred using vehicle-bicycle accident data from the Institute for Traffic Accident Research and Data Analysis (ITARDA) in Japan...
June 5, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28572749/the-effect-of-acute-pomegranate-extract-supplementation-on-oxygen-uptake-in-highly-trained-cyclists-during-high-intensity-exercise-in-a-high-altitude-environment
#14
Emma May Crum, Ahmad Munir Che Muhamed, Matthew Barnes, Stephen Robert Stannard
BACKGROUND: Recent research has indicated that pomegranate extract (POMx) may improve performance during aerobic exercise by enhancing the matching of vascular oxygen (O2) provision to muscular requirements. POMx is rich in ellagitannin polyphenols and nitrates (NO3(-)), which are both associated with improvements in blood flow and O2 delivery. Primarily, this study aimed to determine whether POMx improves performance in a cycling time trial to exhaustion at 100%VO2max (TTE100%) in highly-trained cyclists...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28571608/editorial-for-special-issue-improving-cyclist-safety-through-scientific-research
#15
EDITORIAL
Divera A M Twisk, Stefanie H H M de Hair-Buijssen, Dietmar Otte
No abstract text is available yet for this article.
May 29, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28571021/brief-history-of-anti-doping
#16
Arne Ljungqvist
The fight against doping in sport as we know it today commenced by the creation of the International Olympic Committee (IOC) Medical Commission in 1961 following the death of a Danish cyclist during the Rome Olympic Games the year before. After a slow start, the fight got under way as from the early 1970s under the leadership of the IOC and of the International Association of Athletics Federations. Despite a lack of understanding and weak support even from the sports community, a series of measures were taken during the 1970s and 1980s which still form cornerstones of today's anti-doping strategy...
2017: Medicine and Sport Science
https://www.readbyqxmd.com/read/28570495/power-profiles-of-competitive-and-non-competitive-mountain-bikers
#17
Andrew R Novak, Kyle J M Bennett, Matthew A Pluss, Job Fransen, Mark L Watsford, Ben J Dascombe
The performance of Olympic distance cross-country mountain bikers (XCO-MTB) is affected by constraints such as erosion of track surfaces and mass start congestion which can affect race results. Standardised laboratory assessments quantify inter-seasonal and intra-seasonal cycling potential through the assessment of multiple physiological capacities. Therefore, this study examined whether the power profile assessment could discriminate between competitive XCO-MTB and non-competitive mountain bikers (NC-MTB)...
May 30, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28560751/differential-control-of-respiratory-frequency-and-tidal-volume-during-high-intensity-interval-training
#18
Andrea Nicolò, Samuele M Marcora, Ilenia Bazzucchi, Massimo Sacchetti
Since respiratory frequency (fR ) has been proposed as a good marker of physical effort, furthering the understanding of how fR is regulated during exercise is of great importance. We manipulated recovery intensity and exercise duration during high-intensity interval training (HIIT) to test the hypothesis that fast inputs (including central command) contribute more than metabolic stimuli to fR regulation. Seven male cyclists performed an incremental test, a 10 min and a 20 min continuous time trial (TT) as preliminary tests...
May 31, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28558935/local-muscle-cooling-does-not-impact-expression-of-mitochondrial-related-genes
#19
Robert Shute, Matthew Heesch, Terence Laursen, Dustin Slivka
Recovery that takes place in a cold environment after endurance exercise elevates PGC-1α mRNA whereas ERRα and NRF2 mRNA expression are inhibited. However, the effect of local skeletal muscle cooling on mitochondrial-related gene expression is unknown. PURPOSE: To determine the impact of local skeletal muscle cooling during recovery from an acute bout of exercise on mitochondrial-related gene expression. METHODS: Recreationally-trained male cyclists (n=8, age 25±3 y, height 181±6cm, weight 79±8kg, 12...
July 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28557858/effects-of-combined-strength-and-sprint-training-on-lean-mass-strength-power-and-sprint-performance-in-masters-road-cyclists
#20
Luke Del Vecchio, Robert Stanton, Peter Reaburn, Campbell Macgregor, Jarrod Meerkin, Jerome Villegas, Marko T Korhonen
Strength and sprint training exercises are integral part of training in many younger endurance cyclists to improve cycling efficiency and sprinting ability. This study was undertaken to examine whether muscle and performance characteristics could be improved in endurance-trained masters cyclist by adding strength and sprint training stimuli into their training regimen. Twenty five masters road cyclists were assigned to a combined strength and sprint training group (CT; n=9, 53.5 ± 9.3 years), a sprint training group (ST, n=7, 49...
May 25, 2017: Journal of Strength and Conditioning Research
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