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https://www.readbyqxmd.com/read/29156435/more-than-a-to-b-understanding-and-managing-visitor-spatial-behaviour-in-urban-forests-using-public-participation-gis
#1
Silviya Korpilo, Tarmo Virtanen, Tiina Saukkonen, Susanna Lehvävirta
Planning and management needs up-to-date, easily-obtainable and accurate information on the spatial and social aspects of visitor behaviour in order to balance human use and impacts, and protection of natural resources in public parks. We used a web-based public participation GIS (PPGIS) approach to gather citizen data on visitor behaviour in Helsinki's Central Park in order to aid collaborative spatial decision-making. The study combined smartphone GPS tracking, route drawing and a questionnaire to examine differences between user groups in their use of formal trails, off-trail behaviour and the motivations that affect it...
November 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29155334/respiratory-muscle-strength-is-decreased-after-maximal-incremental-exercise-in-trained-runners-and-cyclists
#2
Ferid Oueslati, Ahmed Berriri, Jan Boone, Said Ahmaidi
The respiratory muscle fatigue seems to be able to limit exercise performance and may influence the determination of maximal oxygen uptake (V̇O2max) or maximum aerobic work rate during maximal incremental test. The aim of this study was therefore to investigate whether maximal incremental exercise decreases respiratory muscle strength. We hypothesized that respiratory muscle strength (maximal pressure) will decrease after maximal incremental exercise to exhaustion. 36 runners and 23 cyclists completed a maximal incremental test on a treadmill or a cycle ergometer with continuous monitoring of expired gases...
November 18, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29153867/impact-of-upper-body-precooling-during-warm-up-on-subsequent-time-trial-paced-cycling-in-the-heat
#3
Charles P Katica, Jonathan E Wingo, Robert L Herron, Greg A Ryan, Stacy H Bishop, Mark Richardson
OBJECTIVES: The purpose of this study was to test the hypothesis that cooling the upper body during a warm-up enhances performance during a subsequent 16.1-km simulated cycling time trial in a hot environment. DESIGN: Counterbalanced, repeated measures design. METHODS: Eight trained, male cyclists (peak oxygen uptake=57.8±5.0mLkg(-1)min(-1)) completed two simulated 16.1-km time trials in a hot environment (35.0±0.5°C, 43.8±2.0% relative humidity) each separated by 72h...
October 16, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29153449/the-changing-epidemiology-of-open-fractures-in-vehicle-occupants-pedestrians-motorcyclists-and-cyclists
#4
Dennis Winkler, Stuart T Goudie, Charles M Court-Brown
AIMS: To investigate the changing epidemiology of open fractures in vehicle occupants, pedestrians, motorcyclists and cyclists. MATERIALS AND METHODS: Data on all non-spinal open fractures admitted to the Royal Infirmary of Edinburgh after a road traffic accident between 1988 and 2010 were collected and analysed to provide information about the changing epidemiology in different patient groups. Demographic information was collected on all patients with the severity of injury being analysed with the Injury Severity Score (ISS), Musculoskeletal Index (MSI) and the number of open fractures...
November 14, 2017: Injury
https://www.readbyqxmd.com/read/29150346/aerodynamic-study-of-time-trial-helmets-in-cycling-racing-using-cfd-analysis
#5
F Beaumont, R Taiar, G Polidori, H Trenchard, F Grappe
The aerodynamic drag of three different time-trial cycling helmets was analyzed numerically for two different cyclist head positions. Computational Fluid Dynamics (CFD) methods were used to investigate the detailed airflow patterns around the cyclist for a constant velocity of 15 m/s without wind. The CFD simulations have focused on the aerodynamic drag effects in terms of wall shear stress maps and pressure coefficient distributions on the cyclist/helmet system. For a given head position, the helmet shape, by itself, obtained a weak effect on a cyclist's aerodynamic performance (<1...
November 8, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29124324/the-effect-of-mental-fatigue-on-critical-power-during-cycling-exercise
#6
Hawbeer Salam, Samuele M Marcora, James G Hopker
PURPOSE: Time to exhaustion (TTE) tests used in the determination of critical power (CP) and curvature constant (W') of the power-duration relationship are strongly influenced by the perception of effort (PE). This study aimed to investigate whether manipulation of the PE alters the CP and W'. METHODS: Eleven trained cyclists completed a series of TTE tests to establish CP and W' under two conditions, following a mentally fatiguing (MF), or a control (CON) task...
November 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#7
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29117073/metabolic-and-performance-effects-of-yerba-mate-on-well-trained-cyclists
#8
Jose L Areta, Ingvild Austarheim, Helle Wangensteen, Carlo Capelli
INTRODUCTION: Yerba Mate (YM) is a South-American plant, rich in polyphenols, saponins and xanthines, of growing scientific interest due to its metabolic effects. YM has been shown to increase fat utilization during exercise in untrained humans, but its effects on well-trained individuals during exercise are unknown. METHODS: We characterized metabolic and physical performance effects of YM in eleven well-trained male cyclists. In a double-blind crossover design, participants ingested 5 g of YM or placebo (PL; maltodextrin) daily for 5 days, and 1 h prior to experimental trials...
November 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29117071/deception-improves-tt-performance-in-well-trained-cyclists-without-augmented-fatigue
#9
Paul Ansdell, Kevin Thomas, Glyn Howatson, Markus Amann, Stuart Goodall
PURPOSE: To investigate the effects of feedback, in the form of a virtual avatar paced at 100 and 102% of baseline performance, on neuromuscular fatigue following a 4 km cycling time trial (TT). We hypothesised that improved cycling performance would occur due to participants exceeding a previously established critical threshold, and experiencing greater neuromuscular fatigue. METHODS: Following familiarisation, ten well-trained cyclists performed a baseline 4 km TT without feedback (BASE), followed by two, 4 km TT where they raced against an avatar (set at 100% [accurate - ACC] and 102% [deception - DEC] of baseline power output), in a randomised and counterbalanced order...
November 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29112625/ischemic-preconditioning-improves-time-trial-performance-at-moderate-altitude
#10
Pénélope Paradis-Deschênes, Denis R Joanisse, François Billaut
PURPOSE: Endurance athletes often compete and train at altitude where exercise capacity is reduced. Investigating acclimation strategies is therefore critical. Ischemic preconditioning (IPC) can improve endurance performance at sea level through improved O2 delivery and utilization, which could also prove beneficial at altitude. However, data are scarce and there is no study at altitudes commonly visited by endurance athletes. METHODS: In a randomized, crossover study, we investigated performance and physiological responses in thirteen male endurance cyclists during four 5-km cycling time trials (TT), preceded by either IPC (3x5-minutes ischemia/5-minutes reperfusion cycles at 220 mmHg) or SHAM (20 mmHg) administered to both thighs, at simulated low (FIO2 0...
November 6, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29109686/ketone-diester-ingestion-impairs-time-trial-performance-in-professional-cyclists
#11
Jill J Leckey, Megan L Ross, Marc Quod, John A Hawley, Louise M Burke
We investigated the effect of pre- "race" ingestion of a 1,3-butanediol acetoacetate diester on blood ketone concentration, substrate metabolism and performance of a cycling time trial (TT) in professional cyclists. In a randomized cross-over design, 10 elite male cyclists completed a ~31 km laboratory-based TT on a cycling ergometer programmed to simulate the 2017 World Road Cycling Championships course. Cyclists consumed a standardized meal [2 g/kg body mass (BM) carbohydrate (CHO)] the evening prior to a trial day and a CHO breakfast (2 g/kg BM CHO) with 200 mg caffeine on the morning of a trial day...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29102034/under-reporting-bicycle-accidents-to-police-in-the-cost-tu1101-international-survey-cross-country-comparisons-and-associated-factors
#12
D Shinar, P Valero-Mora, M van Strijp-Houtenbos, N Haworth, A Schramm, Guido De Bruyne, V Cavallo, J Chliaoutakis, J Dias, O E Ferraro, A Fyhri, A Hursa Sajatovic, K Kuklane, R Ledesma, O Mascarell, A Morandi, M Muser, D Otte, M Papadakaki, J Sanmartín, D Dulf, M Saplioglu, G Tzamalouka
Police crash reports are often the main source for official data in many countries. However, with the exception of fatal crashes, crashes are often underreported in a biased manner. Consequently, the countermeasures adopted according to them may be inefficient. In the case of bicycle crashes, this bias is most acute and it probably varies across countries, with some of them being more prone to reporting accidents to police than others. Assessing if this bias occurs and the size of it can be of great importance for evaluating the risks associated with bicycling...
October 26, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/29079981/commuter-exposure-to-black-carbon-particles-on-diesel-buses-on-bicycles-and-on-foot-a-case-study-in-a-brazilian-city
#13
Admir Créso Targino, Marcos Vinicius C Rodrigues, Patricia Krecl, Yago Alonso Cipoli, João Paulo M Ribeiro
Commuting in urban environments accounts for a large fraction of the daily dose of inhaled air pollutants, especially in countries where vehicles have old technologies or run on dirty fuels. We measured black carbon (BC) concentrations during bus, walk and bicycle commutes in a Brazilian city and found a large spatial variability across the surveyed area, with median values between 2.5 and 12.0 μg m(-3). Traffic volume on roadways (especially the number of heavy-duty diesel vehicles), self-pollution from the bus tailpipe, number of stops along the route and displacement speed were the main drivers of air pollution on the buses...
October 27, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29079359/the-copeptin-response-after-physical-activity-is-not-associated-with-cardiac-biomarkers-or-asymptomatic-coronary-artery-disease
#14
Kristin M Aakre, Øyunn Kleiven, Øyvind Skadberg, Magnus F Bjørkavoll-Bergseth, Tor Melberg, Heidi Strand, Tor-Arne Hagve, Stein Ørn
BACKGROUND: Copeptin concentrations increase both during acute coronary syndrome and following physical exercise. The relationship between copeptin increase following physical exercise and coronary artery disease (CAD) is uncertain. The aim of this study was to 1) describe the copeptin response following strenuous physical exercise, and 2) investigate the determinants of exercise induced copeptin concentrations, particularly in relation to cardiac biomarkers and CAD. METHODS: Serum samples were collected from 97 recreational cyclists 24h before, and immediately, 3 and 24h after a 91-km bike race...
October 25, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/29068603/differences-in-echocardiography-blood-pressure-stroke-volume-maximal-power-and-profile-of-genes-related-to-cardiac-hypertrophy-in-elite-road-cyclists
#15
Grażyna Janikowska, Aleksandra Żebrowska, Aleksandra Kochańska-Dziurowicz, Urszula Mazurek
BACKGROUND: Regular and moderate exercise is beneficial for improving the efficiency of the heart, but high-intensity physical activity may result in cardiac changes. OBJECTIVES: This study focuses on the identification of the differences in echocardiography and blood variables before exercise, as well as the genes associated with cardiac hypertrophy at rest and in response to graded exercise test. MATERIAL AND METHODS: The study group was made up of 28 road cyclists...
September 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29063156/-a-spatially-explicit-analysis-of-traffic-accidents-involving-pedestrians-and-cyclists-in-berlin
#16
REVIEW
Tobia Lakes
BACKGROUND: In many German cities and counties, sustainable mobility concepts that strengthen pedestrian and cyclist traffic are promoted. From the perspectives of urban development, traffic planning and public healthcare, a spatially differentiated analysis of traffic accident data is decisive. OBJECTIVES: 1) The identification of spatial and temporal patterns of the distribution of accidents involving cyclists and pedestrians, 2) the identification of hotspots and exploration of possible underlying causes and 3) the critical discussion of benefits and challenges of the results and the derivation of conclusions...
October 23, 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/29061618/critical-care-cycling-study-cyclist-trial-protocol-a-randomised-controlled-trial-of-usual-care-plus-additional-in-bed-cycling-sessions-versus-usual-care-in-the-critically-ill
#17
Marc R Nickels, Leanne M Aitken, James Walsham, Adrian G Barnett, Steven M McPhail
INTRODUCTION: In-bed cycling with patients with critical illness has been shown to be safe and feasible, and improves physical function outcomes at hospital discharge. The effects of early in-bed cycling on reducing the rate of skeletal muscle atrophy, and associations with physical and cognitive function are unknown. METHODS AND ANALYSIS: A single-centre randomised controlled trial in a mixed medical-surgical intensive care unit (ICU) will be conducted. Adult patients (n=68) who are expected to be mechanically ventilated for more than 48 hours and remain in ICU for a further 48 hours from recruitment will be randomly allocated into either (1) a usual care group or (2) a group that receives usual care and additional in-bed cycling sessions...
October 22, 2017: BMJ Open
https://www.readbyqxmd.com/read/29035607/accuracy-of-w-recovery-kinetics-in-high-performance-cyclists-modelling-intermittent-work-capacity
#18
Jason C Bartram, Dominic Thewlis, David T Martin, Kevin I Norton
PURPOSE: With knowledge of an individual's critical power (CP) and W' the SKIBA 2 model provides a framework with which to track W' balance during intermittent high intensity work bouts. There are fears the time constant controlling the recovery rate of W' (τW') may require refinement to enable effective use in an elite population. METHODS: Four elite endurance cyclists completed an array of intermittent exercise protocols to volitional exhaustion. Each protocol lasted approximately 3...
October 16, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29035602/effect-of-pre-exercise-ingestion-of-modified-amylomaize-starch-on-glycemic-response-while-cycling
#19
Rachel B Parks, Hector F Angus, Douglas S King, Rick Sharp
Amylomaize-7 is classified as a resistant corn starch and is 68% digestible. When modified by partial hydrolysis in ethanol and hydrochloric acid, its digestibility is 92%, yet retains its low glycemic and insulinemic properties. The purpose of this study was to characterize the metabolic response when modified amylomaize-7 or dextrose is consumed in the hour before exercise, and to compare the effect on performance of a brief high-intensity cycling trial. Ten male trained cyclists were given 1 g/kg body mass of dextrose (DEX) or modified amylomaize-7 (AMY-7) or a flavored water placebo (PL) 45 min prior to exercise on a cycle ergometer...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29035597/influence-of-2-weeks-ingestion-of-high-chlorogenic-acid-coffee-on-mood-state-performance-and-post-exercise-inflammation-and-oxidative-stress-a-randomized-placebo-controlled-trial
#20
David C Nieman, Courtney L Goodman, Christopher R Capps, Zack L Shue, Robert Arnot
This study measured the influence of 2-weeks ingestion of high chlorogenic acid (CQA) coffee on post-exercise inflammation and oxidative stress, with secondary outcomes including performance and mood state. Cyclists (N=15) were randomized to CQA coffee or placebo (300 ml/day) for 2 weeks, participated in a 50-km cycling time trial, and then crossed over to the opposite condition with a 2-week washout period. Blood samples were collected pre- and post-supplementation, and immediately post-exercise. CQA coffee was prepared using the Turkish method with 30 g lightly roasted, highly ground Hambela coffee beans in 300 ml boiling water, and provided 1,066 mg CQA and 474 mg caffeine versus 187 mg CQA and 33 mg caffeine for placebo...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
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