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https://www.readbyqxmd.com/read/28338371/reliability-and-seasonal-changes-of-submaximal-variables-to-evaluate-professional-cyclists
#1
Jose A Rodríguez-Marroyo, Raúl Pernía, José G Villa, Carl Foster
PURPOSE: The aim of this study was to determine the reliability and validity of several submaximal variables that can be easily obtained by monitoring cyclists' performance. METHODS: Eighteen professional cyclists participated in this study. In a first part (n=15) the test-retest reliability of HR and RPE during a progressive maximal test was measured. Derived submaximal variables based on HR, RPE and power output (PO) responses were analyzed. In a second part (n=7) the pattern of the submaximal variables according to cyclists' training status was analyzed...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338363/decrement-in-professional-cyclists-performance-after-a-grand-tour
#2
Jose A Rodríguez-Marroyo, José G Villa, Raúl Pernía, Carl Foster
PURPOSE: The aim of this study was to analyze professional cyclists' performance decline after, and the exercise demands during, a Grand Tour. METHOD: Seven professional cyclists performed two incremental exercise tests, 1-week before and the day after the Vuelta España. During the race the exercise demands were analyzed on the basis of the HR. Three intensity zones were established according to reference HR values corresponding to the ventilatory (VT) and respiratory compensation (RCT) thresholds determined during the pre-race test...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338359/optimizing-the-team-for-required-power-during-track-cycling-team-pursuit
#3
Levi Heimans, Wouter R Dijkshoorn, Marco J M Hoozemans, Jos J de Koning
PURPOSE: Since the aim of the men's team pursuit in time trial track cycling is to accomplish a distance of 4000m as fast as possible, optimizing aerodynamic drag can contribute to achieving this goal. The aim of this study is to determine the drafting effect in second, third and fourth position during the team pursuit in track cycling as a function of the team members' individual frontal areas in order to minimize the required power. METHOD: Eight experienced track cyclists of the Dutch national selection performed 39 trials of 3-km in different teams of four cyclists at a constant velocity of 15...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28332171/sport-and-male-sexuality
#4
REVIEW
P Sgrò, L Di Luigi
The relationships between sport and sexuality in males are of great social and clinical interest, because of sports and motor activities that highly promote social and sexual relationships. Even if few literature exist, two main questions should be taken into account: whether and how physical exercise and sport positively or negatively influence sexual health and behavior and/or whether and how sexual behavior may affect a sub-sequent sport performance. Physical exercise and sport per se can influence, positively or negatively, the hypothalamic-pituitary-testicular axis function and, consequently, the individual's reproductive and/or sexual health...
March 22, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28328677/genitourinary-injuries-following-traffic-accidents-analysis-of-a-registry-of-162-690-victims
#5
Jean E Terrier, P Paparel, B Gadegbeku, Alain Ruffion, Lawrence C Jenkins, Amina N'Diaye
BACKGROUND: Traffic accidents are the most frequent cause of genitourinary injuries (GUI). Kidney injuries following trauma have been well described. However, there exists a paucity of data on other traumatic genitourinary injuries following traffic accidents. The objective of this study was to analyze the frequency and type of all genitourinary injuries, by user category, following traffic accidents. METHODS: Patient cases were extracted from the trauma registry of the French department of Rhone from 1996 to 2013...
March 21, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28326809/identifying-factors-affecting-the-safety-of-mid-block-bicycle-lanes-considering-mixed-two-wheeled-traffic-flow
#6
Lu Bai, Ching-Yao Chan, Pan Liu, Chengcheng Xu
OBJECTIVE: Electric bikes (e-bikes) were one of the fastest growing trip modes in Southeast Asia over the past two decades. The increasing popularity of e-bikes raised some safety concerns on urban transport system. The primary objective of this study was to identify whether and how the generalized linear regression model (GLM) could be used to relate the cyclists' safety with various contributing factors when they were riding in a mid-block bike lane. The types of two-wheeled vehicles in the study included bicycle style electric bicycles (BSEBs), scooter style electric bicycles (SSEBs) and regular bicycles (RBs)...
March 22, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28319757/interaction-driver-bicyclist-on-rural-roads-effects-of-cross-sections-and-road-geometric-elements
#7
Francesco Bella, Manuel Silvestri
The interaction of motorists and bicyclists, particularly during passing maneuvers, is cited as one of the primary causes of bicyclist fatalities. This paper reports the results of a driving simulator study, which sought to analyze the effects that three cross-section configurations of a two-lane rural road and four geometric elements of the road have on driver behavior, during the interaction with a cyclist. A two-lane rural road, about 11km long, was designed and implemented in an advanced-interactive driving simulator...
March 17, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28319756/on-the-effect-of-networks-of-cycle-tracks-on-the-risk-of-cycling-the-case-of-seville
#8
R Marqués, V Hernández-Herrador
We analyze the evolution of the risk of cycling in Seville before and after the implementation of a network of segregated cycle tracks in the city. Specifically, we study the evolution of the risk for cyclists of being involved in a collision with a motor vehicle, using data reported by the traffic police along the period 2000-2013, i.e. seven years before and after the network was built. A sudden drop of such risk was observed after the implementation of the network of bikeways. We study, through a multilinear regression analysis, the evolution of the risk by means of explanatory variables representing changes in the built environment, specifically the length of the bikeways and a stepwise jump variable taking the values 0/1 before/after the network was implemented...
March 16, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28314078/high-physical-fitness-is-associated-with-reduction-in-basal-and-exercise-induced-inflammation
#9
Øyunn Kleiven, Magnus Bjørkavoll-Bergseth, Tor Melberg, Øyvind Skadberg, Rolf Bergseth, Jone Selvåg, Bjørn Auestad, Pål Aukrust, Torbjørn Aarsland, Stein Ørn
C-reactive protein (CRP) increases after strenuous exercise. It has been a concern that prolonged strenuous exercise may be harmful, and induce a deleterious inflammatory response. The purpose of this study was to 1) Assess and quantify the magnitude of CRP response following an endurance cycling competition in healthy middle-aged recreational cyclists. 2) Identify important determinants of this response. 3) Identify the relationship between CRP, myocardial damage (cardiac Troponin I (cTnI)) and myocardial strain (B-type natriuretic peptide (BNP))...
March 17, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28302463/critical-power-testing-or-self-selected-cycling-which-one-is-the-best-predictor-of-maximal-metabolic-steady-state
#10
Felipe Mattioni Maturana, Daniel A Keir, Kaitlin M McLay, Juan M Murias
Critical power (CP) demarcates the boundary between heavy and very heavy exercise intensity domains, and therefore, the power output (PO) that can be sustained at the maximal metabolic steady-state during constant-PO exercise (i.e., maximal lactate steady-state (MLSS)). However, the estimated CP does not always reflect a sustainable intensity of exercise, where blood lactate concentration ([La]) and oxygen uptake (V˙O2) reach a plateau. OBJECTIVES: To test cyclists' ability to predict their highest PO associated with metabolic steady-state based on their own perception of effort...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28296466/road-accident-fatality-risks-for-vulnerable-versus-protected-road-users-in-northern-ghana
#11
James Damsere-Derry, Gavan Palk, Mark King
Background Road traffic injuries (RTIs) are a serious epidemic which claims more than a million lives across the globe each year. The burden of RTIs is particularly pronounced in Africa and other low and middle income countries. The unfavourable disparity of the burden of road trauma in the world is largely attributable to unsafe vehicles, lack of appropriate road infrastructure and the predominance of vulnerable road users (VRUs) in developing countries. However, little research exists in Northern Ghana to highlight the scale and risk of death among road users...
March 15, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28287007/validation-of-the-virtual-elevation-field-test-method-when-assessing-the-aerodynamics-of-para-cyclists-with-a-uni-lateral-trans-tibial-amputation
#12
Bryce Dyer, B Xavier Disley
Lower-limb amputees typically require some form of prosthetic limb to ride a bicycle for recreation or when competing. At elite-level racing speeds, aerodynamic drag can represent the majority of the resistance acting against a cyclists' forward motion. As a result, the reduction of such resistance is beneficial to an amputee whereby the form and function of the prosthetic limb can be optimized through engineering. To measure the performance of such limbs, field testing provides a cost-effective and context-specific method of aerodynamic drag measurement...
March 12, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28282865/utilizing-crowdsourced-data-for-studies-of-cycling-and-air-pollution-exposure-a-case-study-using-strava-data
#13
Yeran Sun, Amin Mobasheri
With the development of information and communications technology, user-generated content and crowdsourced data are playing a large role in studies of transport and public health. Recently, Strava, a popular website and mobile app dedicated to tracking athletic activity (cycling and running), began offering a data service called Strava Metro, designed to help transportation researchers and urban planners to improve infrastructure for cyclists and pedestrians. Strava Metro data has the potential to promote studies of cycling and health by indicating where commuting and non-commuting cycling activities are at a large spatial scale (street level and intersection level)...
March 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28280973/determinants-of-curvature-constant-w-of-the-power-duration-relationship-under-normoxia-and-hypoxia-the-effect-of-pre-exercise-alkalosis
#14
Sanjoy K Deb, Lewis A Gough, S Andy Sparks, Lars R McNaughton
PURPOSE: This study investigated the effect of induced alkalosis on the curvature constant (W') of the power-duration relationship under normoxic and hypoxic conditions. METHODS: Eleven trained cyclists (mean ± SD) Age: 32 ± 7.2 years; body mass (bm): 77.0 ± 9.2 kg; VO2peak: 59.2 ± 6.8 ml·kg(-1)·min(-1) completed seven laboratory visits which involved the determination of individual time to peak alkalosis following sodium bicarbonate (NaHCO3) ingestion, an environment specific ramp test (e...
March 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28278174/exploring-the-performance-reserve-effect-of-different-magnitudes-of-power-output-deception-on-4-000-m-cycling-time-trial-performance
#15
Mark R Stone, Kevin Thomas, Michael Wilkinson, Emma Stevenson, Alan St Clair Gibson, Andrew M Jones, Kevin G Thompson
PURPOSE: The aim of the present study was to investigate whether a magnitude of deception of 5% in power output would lead to a greater reduction in the amount of time taken for participants to complete a 4000 m cycling TT than a magnitude of deception of 2% in power output, which we have previously shown can lead to a small change in 4000 m cycling TT performance. METHODS: Ten trained male cyclists completed four, 4000 m cycling TTs. The first served as a habituation and the second as a baseline for future trials...
2017: PloS One
https://www.readbyqxmd.com/read/28269977/maximal-strength-and-its-maintenance-versus-endurance-strength-and-its-cessation-in-well-trained-off-road-cyclists
#16
Javier Botella, José M Sarabia, Silvia Guillén, Raúl López-Grueso, Keijo Häkkinen, Rafael Sabido
No abstract text is available yet for this article.
April 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28268718/a-new-crank-arm-based-load-cell-with-built-in-conditioning-circuit-and-strain-gages-to-measure-the-components-of-the-force-applied-by-a-cyclist
#17
Andre V Pigatto, Karina O A Moura, Gabriela W Favieiro, Alexandre Balbinot
This report describes the development of a force platform based on instrumented load cells with built-in conditioning circuit and strain gages to measure and acquire the components of the force that is applied to the bike crank arm during pedaling in real conditions, and save them on a SD Card. To accomplish that, a complete new crank arm 3D solid model was developed in the SolidWorks, with dimensions equivalent to a commercial crank set and compatible with a conventional road bike, but with a compartment to support all the electronics necessary to measure 3 components of the force applied to the pedal during pedaling...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28253040/demands-of-world-cup-competitions-in-elite-women-road-cycling
#18
Paolo Menaspà, Marco Sias, Gene Bates, Antonio La Torre
PURPOSE: Describing the demand of recent World Cup (WC) races comparing Top 10 (T10) and non-Top 10 (N-T10) performances using power data. METHODS: Race data were collected in 1-day World Cup races during the 2012-2015 road cycling seasons. Seven female cyclists completed 49 WC races, finishing 25 times in T10 and 24 times N-T10. Peak power (1 s) and Maximal Mean Power (MMP) for durations of 5, 10, 20 and 30 s and 1, 2, 5, 10, 20, 30 and 60 min expressed as power to weight ratio were analysed in T10 and N-T10...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253026/training-intensity-distribution-in-road-cyclists-objective-versus-subjective-measures
#19
Dajo Sanders, Tony Myers, Ibrahim Akubat
PURPOSE: This study aims to evaluate training intensity distribution using different intensity measures based on session rating of perceived exertion (sRPE), heart rate (HR) and power output (PO) in well-trained cyclists. METHODS: Fifteen road cyclists participated in the study. Training data was collected during a 10-week training period. Training intensity distribution was quantified using HR, PO and sRPE categorized in a 3-zone training intensity model. Three zones for HR and PO were based around a first and second lactate threshold...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28248693/calcium-supplementation-attenuates-disruptions-in-calcium-homeostasis-during-exercise
#20
Vanessa D Sherk, Sarah J Wherry, Daniel W Barry, Karen L Shea, Pamela Wolfe, Wendy M Kohrt
An exercise-induced decrease in serum ionized calcium (iCa) is thought to trigger an increase in parathyroid hormone (PTH), which can stimulate bone resorption. PURPOSE: The purpose of this study was to determine whether taking a chewable calcium (Ca) supplement 30 minutes before exercise mitigates disruptions in Ca homeostasis and bone resorption in competitive male cyclists. METHODS: Fifty-one men aged 18 to 45 y were randomized to take either 1000 mg Ca (CA) or placebo (PL) 30 minutes before a simulated 35-km cycling time trial...
February 28, 2017: Medicine and Science in Sports and Exercise
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