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https://www.readbyqxmd.com/read/27920747/social-influence-and-different-types-of-red-light-behaviors-among-cyclists
#1
Federico Fraboni, Víctor Marín Puchades, Marco De Angelis, Gabriele Prati, Luca Pietrantoni
Accident analysis and studies on traffic revealed that cyclists' violation of red-light regulation is one typical infringement committed by cyclists. Furthermore, an association between cyclists' crash involvement and red-light violations has been found across different countries. The literature on cyclists' psychosocial determinants of red-light violation is still scarce. The present study, based on the classification of cyclists' red-light behavior in risk-taking (ignoring the red-light and traveling through the junction without stopping), opportunistic (waiting at red-lights but being too impatient to wait for green signal and subsequently crossing the junction), and law-obeying (stopping to obey the red-light), adopted an eye-observational methodology to investigate differences in cyclists' crossing behavior at intersections, in relation to traffic light violations and the presence of other cyclists...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27918669/the-within-season-distribution-of-external-training-and-racing-workload-in-professional-male-road-cyclist
#2
Alan J Metcalfe, Paolo Menaspà, Vincent Villerius, Marc Quod, Jeremiah J Peiffer, Andrew D Govus, Chris R Abbiss
PURPOSE: To describe the within-season external workloads of professional male road cyclists for optimal training prescription. METHODS: Training and racing of four international competitive professional male cyclists (age 24 ± 2 y, body mass 77.6 ± 1.5 kg) were monitored for 12 months prior to the world team time trial championships. Three within-season phases leading up to the team time trial world championships on 20(th) Sept 2015 were defined as phase one (Oct - Jan), phase two (Feb - May) and phase three (June - Sept)...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918663/comparison-of-critical-power-and-w-derived-from-two-or-three-maximal-tests
#3
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/27899900/fiber-type-specific-satellite-cell-content-in-cyclists-following-heavy-training-with-carbohydrate-and-carbohydrate-protein-supplementation
#4
Alec I McKenzie, Andrew C D'Lugos, Michael J Saunders, Keith D Gworek, Nicholas D Luden
The central purpose of this study was to evaluate the fiber type-specific satellite cell and myonuclear responses of endurance-trained cyclists to a block of intensified training, when supplementing with carbohydrate (CHO) vs. carbohydrate-protein (PRO). In a crossover design, endurance-trained cyclists (n = 8) performed two consecutive training periods, once supplementing with CHO (de facto "control" condition) and the other with PRO. Each training period consisted of 10 days of intensified cycle training (ICT-120% increase in average training duration) followed by 10 days of recovery (RVT-reduced volume training; 33% volume reduction vs...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27898642/manipulation-of-muscle-creatine-and-glycogen-changes-dxa-estimates-of-body-composition
#5
Julia L Bone, Megan L Ross, Kristyen A Tomcik, Nikki A Jeacocke, Will G Hopkins, Louise M Burke
: Standardising a dual x-ray absorptiometry (DXA) protocol is thought to provide a reliable measurement of body composition. PURPOSE: We investigated the effects of manipulating muscle glycogen and creatine content independently and additively on DXA estimates of lean mass. METHOD: Eighteen well-trained male cyclists undertook a parallel group application of creatine loading (n=9) (20 g/d for 5 d loading; 3 g/d maintenance) or placebo (n=9) with crossover application of glycogen loading (12 v 6 g/kg BM/d for 48 h) as part of a larger study involving a glycogen-depleting exercise protocol...
November 28, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27897989/periodization-of-carbohydrate-intake-short-term-effect-on-performance
#6
Laurie-Anne Marquet, Christophe Hausswirth, Odeline Molle, John A Hawley, Louise M Burke, Eve Tiollier, Jeanick Brisswalter
BACKGROUND: "Sleep-low" consists of a sequential periodization of carbohydrate (CHO) availability-low glycogen recovery after "train high" glycogen-depleting interval training, followed by an overnight-fast and light intensity training ("train low") the following day. This strategy leads to an upregulation of several exercise-responsive signaling proteins, but the chronic effect on performance has received less attention. We investigated the effects of short-term exposure to this strategy on endurance performance...
November 25, 2016: Nutrients
https://www.readbyqxmd.com/read/27891098/deceptive-manipulation-of-competitive-starting-strategies-influences-subsequent-pacing-physiological-status-and-perceptual-responses-during-cycling-time-trials
#7
Emily L Williams, Hollie S Jones, S Andy Sparks, David C Marchant, Adrian W Midgley, Craig A Bridge, Lars R McNaughton
Little is currently known regarding competitor influence on pacing at the start of an event and in particular the subsequent effect on the remaining distance. The purpose of the present study was to investigate the influence of starting pace on the physiological and psychological responses during cycling time trials (TT) utilizing an innovative approach allowing pace to be accurately and dynamically replicated, as well as deceptively manipulated. Ten competitive male cyclists completed five 16.1 km TT, two baseline trials performed alone (BLs), and three with a simulated, dynamic avatar of which they were to match the pace of for the initial 4 km...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27890161/primary-or-secondary-tasks-dual-task-interference-between-cyclist-hazard-perception-and-cadence-control-using-cross-modal-sensory-aids-with-rider-assistance-bike-computers
#8
Chao-Yang Yang, Cheng-Tse Wu
This research investigated the risks involved in bicycle riding while using various sensory modalities to deliver training information. To understand the risks associated with using bike computers, this study evaluated hazard perception performance through lab-based simulations of authentic riding conditions. Analysing hazard sensitivity (d') of signal detection theory, the rider's response time, and eye glances provided insights into the risks of using bike computers. In this study, 30 participants were tested with eight hazard perception tasks while they maintained a cadence of 60 ± 5 RPM and used bike computers with different sensory displays, namely visual, auditory, and tactile feedback signals...
March 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27890118/3d-digital-headform-models-of-australian-cyclists
#9
Thierry Ellena, Sebastian Skals, Aleksandar Subic, Helmy Mustafa, Toh Yen Pang
Traditional 1D anthropometric data have been the primary source of information used by ergonomists for the dimensioning of head and facial gear. Although these data are simple to use and understand, they only provide univariate measures of key dimensions. 3D anthropometric data, however, describe the complete shape characteristics of the head surface, but are complicated to interpret due to the abundance of information they contain. Consequently, current headform standards based on 1D measurements may not adequately represent the actual head shape variations of the intended user groups...
March 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27889656/safety-effects-of-the-london-cycle-superhighways-on-cycle-collisions
#10
Haojie Li, Daniel J Graham, Pan Liu
This paper evaluates the effects of the London Cycle Superhighways (CS) on cycle collisions. A total of 45 CS segments and 375 control segments are observed for a period of 8 years in London. Variables such as road characteristics, crash history and socio-economic information are included in the data set. Traffic characteristics including traffic volume, cycle volume and traffic speed are obtained from Department for Transport. We first estimate the safety effects on the CS routes using Empirical Bayes methods...
November 24, 2016: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/27886836/ulnar-neuropathy-in-cyclists
#11
REVIEW
Jacob W Brubacher, Fraser J Leversedge
The form and function of the cyclist exposes the ulnar nerve to both traction and compressive forces at both the elbow and wrist. Prevention of ulnar neuropathy and treatment of early symptoms include bike fitting, avoidance of excessive or prolonged weight-bearing through the hands, and the use of padded gloves. For persisting or progressive symptoms, a thorough history and physical examination is essential to confirm the diagnosis and to rule out other sites of nerve compression. The majority of compression neuropathies in cyclists resolve after appropriate rest and conservative treatment; however, should symptoms persist, nerve decompression may be indicated...
February 2017: Hand Clinics
https://www.readbyqxmd.com/read/27882605/placebo-in-sports-nutrition-a-proof-of-principle-study-involving-caffeine-supplementation
#12
B Saunders, L F de Oliveira, R P da Silva, V de Salles Painelli, L S Gonçalves, G Yamaguchi, T Mutti, E Maciel, H Roschel, G G Artioli, B Gualano
We investigated the effects of supplement identification on exercise performance with caffeine supplementation. Forty-two trained cyclists (age 37 ± 8 years, body mass [BM] 74.3 ± 8.4 kg, height 1.76 ± 0.06 m, maximum oxygen uptake 50.0 ± 6.8 mL/kg/min) performed a ~30 min cycling time-trial 1 h following either 6 mg/kgBM caffeine (CAF) or placebo (PLA) supplementation and one control (CON) session without supplementation. Participants identified which supplement they believed they had ingested ("caffeine", "placebo", "don't know") pre- and post-exercise...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27879642/curcumin-and-boswellia-serrata-modulate-the-glyco-oxidative-status-and-lipo-oxidation-in-master-athletes
#13
Nino Cristiano Chilelli, Eugenio Ragazzi, Romina Valentini, Chiara Cosma, Stefania Ferraresso, Annunziata Lapolla, Giovanni Sartore
BACKGROUND: Chronic intensive exercise is associated with a greater induction of oxidative stress and with an excess of endogenous advanced glycation end-products (AGEs). Curcumin can reduce the accumulation of AGEs in vitro and in animal models. We examined whether supplementation with curcumin and Boswellia serrata (BSE) gum resin for 3 months could affect plasma levels of markers of oxidative stress, inflammation, and glycation in healthy master cyclists. METHODS: Forty-seven healthy male athletes were randomly assigned to Group 1, consisting of 22 subjects given a Mediterranean diet (MD) alone (MD group), and Group 2 consisted of 25 subjects given a MD plus curcumin and BSE (curcumin/BSE group)...
November 21, 2016: Nutrients
https://www.readbyqxmd.com/read/27879519/use-of-the-wattbike-cycle-ergometer-for-attenuation-of-bilateral-pedaling-asymmetry-in-trained-cyclists
#14
David T Kell, Beau Kjerulf Greer
Experienced cyclists typically pedal with a 5-20% bilateral asymmetry in regards to power output. The aim of this study was to determine if visual feedback via the Wattbike cycle ergometer is an effective tool in reducing bilateral pedaling asymmetry in trained cyclists. Twelve subjects completed three 10-minute cycling trials on the Wattbike at a power output consistent with 60% VO2 peak. The three trials consisted of a baseline (BASE) trial in which cyclists pedaled without instruction, a conscious control (CC) trial during which cyclists attempted to pedal symmetrically, and another trial in which cyclists attempted to pedal symmetrically while utilizing visual feedback (VF) of their bilateral power outputs (%) via the Wattbike...
May 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27873019/arterial-stiffness-in-young-adult-swimmers
#15
Masato Nishiwaki, Keisuke Takahara, Naoyuki Matsumoto
PURPOSE: Habitual Aerobic exercise reduces arterial stiffness, but effects of habitual swimming on arterial stiffness are not yet fully understood. Swimming can also increase systolic blood pressure (BP) in normotensive individuals. Accordingly, this cross-sectional study aimed to investigate arterial stiffness in young adult swimmers after considering the influence of BP. METHODS: Participants comprised 41 men (18-21 years), including 15 untrained controls (C), 11 competitive cyclists (aerobic-trained athletes; A), and 15 competitive swimmers (S)...
November 21, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27871098/traffic-accidents-involving-cyclists-identifying-causal-factors-using-questionnaire-survey-traffic-accident-data-and-real-world-observation
#16
Shoko Oikawa, Toshiya Hirose, Shigeru Aomura, Yasuhiro Matsui
The purpose of this study is to clarify the mechanism of traffic accidents involving cyclists. The focus is on the characteristics of cyclist accidents and scenarios, because the number of traffic accidents involving cyclists in Tokyo is the highest in Japan. First, dangerous situations in traffic incidents were investigated by collecting data from 304 cyclists in one city in Tokyo using a questionnaire survey. The survey indicated that cyclists used their bicycles generally while commuting to work or school in the morning...
November 2016: Stapp Car Crash Journal
https://www.readbyqxmd.com/read/27868167/the-role-of-ugandan-district-hospital-orthopedic-units-in-the-care-of-vulnerable-road-users-a-cross-sectional-study
#17
Dan K Kisitu, Lauren E Eyler, Isaac Kajja, Gonzaga Waiswa, Titus Beyeza, David R Ragland, Isabelle Feldhaus, Catherine Juillard, Rochelle A Dicker
BACKGROUND: Musculoskeletal injuries are a common cause of morbidity after road traffic injury (RTI) in motorizing countries. District hospitals provide front-line orthopedic care in Uganda and other sub-Saharan African nations. Improving care at the district hospital level is an important component of the World Health Organization's strategy for surgical and trauma systems strengthening, but the data necessary to inform RTI safety and care initiatives has previously been insufficient at the district hospital level...
December 2016: Injury Epidemiology
https://www.readbyqxmd.com/read/27866599/correlates-of-helmet-use-among-recreation-and-transportation-bicyclists
#18
Anna K Porter, Deborah Salvo, Harold W Kohl Iii
INTRODUCTION: Helmet use prevents injury and mortality if a bicyclist is in a collision while riding. This cross-sectional study sought to identify domain-specific (recreation versus transportation) correlates of helmet use among U.S. adult bicyclists, using nationally representative data from 2012. METHODS: This analysis, conducted in 2015-2016, utilized data from the 2012 National Survey of Bicyclist and Pedestrian Attitudes and Behaviors, administered for the National Highway Traffic Safety Administration...
December 2016: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/27857961/physiologic-and-performance-effects-of-sago-supplementation-before-and-during-cycling-in-a-warm-humid-environment
#19
Mohd Rahimi Che Jusoh, Stephen R Stannard, Toby Mündel
The present study determined whether 0.8g/kg bodyweight sago ingested before (Pre-Sago) or during (Dur-Sago) exercise under warm-humid conditions (30 ± 2°C, 78 ± 3 % RH; 20 km·h(-1) frontal airflow) conferred a performance and/or physiological benefit compared to a control (Control) condition. Eight trained, male cyclists/triathletes (45 ± 4 y, VO2peak: 65 ± 10 ml·kg(-1)·min(-1), peak aerobic power: 397 ± 71 W) completed 3 15-min time-trials (∼75% VO2peak) pre-loaded with 45 min of steady-state (∼55% VO2peak) cycling following > 24 h standardization of training and diet...
April 2016: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/27846992/bicycle-helmet-use-among-persons-5years-and-older-in-the-united-states-2012
#20
Amy Jewett, Laurie F Beck, Christopher Taylor, Grant Baldwin
INTRODUCTION: In 2013, injuries to bicyclists accounted for 925 fatalities and 493,884 nonfatal, emergency department-treated injuries in the United States. Bicyclist deaths increased by 19% from 2010 to 2013. The greatest risk of death and disability to bicyclists is head injuries. The objective of this study was to provide estimates of prevalence and associated factors of bicycle riding and helmet use among children and adults in the United States. METHOD: CDC analyzed self-reported data from the 2012 Summer ConsumerStyles survey...
December 2016: Journal of Safety Research
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