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https://www.readbyqxmd.com/read/29352330/relationship-between-power-duration-parameters-and-mechanical-and-anthropometric-properties-of-the-thigh-in-elite-cyclists
#1
Mehdi Kordi, Campbell Menzies, Len Parker Simpson
PURPOSE: The curvature constant (W') and asymptote (critical power; CP) of the power-duration relationship are important parameters for explaining cycling performance. Short-duration endurance cycling events rely more heavily on the W'; however, the full mechanistic underpinning of this parameter is yet to be determined. Evidence suggests both muscle volume and muscle strength may contribute to the magnitude of W'. Therefore, the present study investigated the relationship between power-duration parameters (CP and W') and (1) anthropometric and (2) mechanical properties of thigh muscles in a sample of elite cyclists...
January 19, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29349382/intravascular-ultrasound-as-a-novel-tool-for-the-diagnosis-and-targeted-treatment-of-functional-popliteal-artery-entrapment-syndrome
#2
Anna E Boniakowski, Frank Davis, Dani Campbell, Minhajuddin Khaja, Katherine A Gallagher
Functional popliteal artery entrapment syndrome can be difficult to diagnose, as the imaging modalities presently employed are designed to detect anatomic entrapment. We describe a novel imaging technique to aid in diagnosis in this cohort. A 22-year-old cyclist presented with exercise-limiting claudication. Magnetic resonance angiography with provocative maneuvers was nondiagnostic. Digital subtraction angiography revealed long-segment occlusion of the popliteal artery with plantar flexion; however, the specific site of compression remained unclear...
June 2017: Journal of Vascular Surgery Cases and Innovative Techniques
https://www.readbyqxmd.com/read/29346033/the-psychology-of-elite-cycling-a-systematic-review
#3
David J Spindler, Mark S Allen, Stewart A Vella, Christian Swann
This systematic review sought to synthesise what is currently known about the psychology of elite cycling. Nine electronic databases were searched in March 2017 for studies reporting an empirical test of any psychological construct in an elite cycling sample. Fourteen studies (total n = 427) met inclusion criteria. Eight studies were coded as having high risk of bias. Themes extracted included mood, anxiety, self-confidence, pain, and cognitive function. Few studies had similar objectives meaning that in many instances findings could not be synthesised in a meaningful way...
January 18, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29342208/comparison-of-traffic-injury-related-hospitalisation-between-bicyclists-and-motorcyclists-in-taiwan
#4
Chih-Wei Pai, Hsiao-Yu Lin, Shin-Han Tsai, Ping-Ling Chen
OBJECTIVES: Bicyclists and motorcyclists contribute substantially to the morbidity and mortality rates of road crash casualties. The objective of the study was to investigate the crash characteristics of bicyclist and motorcyclist casualties presented to hospitals in Taiwan resulting from crashes. METHODS: By using linked data from The National Traffic Crash Dataset and the National Health Insurance Database between 2003 and 2012, logistic regression models were used to examine the determinants of hospitalisation among motorcyclist and bicyclist casualties...
2018: PloS One
https://www.readbyqxmd.com/read/29338584/effect-of-acute-ingestion-of-%C3%AE-hydroxybutyrate-salts-on-the-response-to-graded-exercise-in-trained-cyclists
#5
Mark Evans, Ella Patchett, Rickard Nally, Rachel Kearns, Matthew Larney, Brendan Egan
Acute ingestion of ketone salts induces nutritional ketosis by elevating β-hydroxybutyrate (βHB), but few studies have examined the metabolic effects of ingestion prior to exercise. Nineteen trained cyclists (12 male, 7 female) undertook graded exercise (8 min each at ∼30%, 40%, 50%, 60%, 70%, and 80% VO2peak) on a cycle ergometer on two occasions separated by either 7 or 14 days. Trials included ingestion of boluses of either (i) plain water (3.8 mL kg body mass-1) (CON) or (ii) βHB salts (0.38 g kg body mass-1) in plain water (3...
January 16, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29334005/physiological-correlations-with-short-medium-and-long-cycling-time-trial-performance
#6
Fernando K Borszcz, Artur F Tramontin, Kristopher M de Souza, Lorival J Carminatti, Vitor P Costa
PURPOSE: Several studies have demonstrated that physiological variables predict cycling endurance performance. However, it is still unclear whether the predictors will change over different performance durations. The aim of this study was to assess the correlations between physiological variables and cycling time trials with different durations. METHODS: Twenty trained male cyclists (maximal oxygen uptake [VO2max] = 60.5 ± 5.6 mL/kg/min) performed 4 separate experimental trials during a 2-week period...
January 15, 2018: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/29320303/time-of-day-and-short-duration-high-intensity-exercise-influences-on-coagulation-and-fibrinolysis
#7
Emma Kate Zadow, Cecilia Marie Kitic, Sam Shi Xuan Wu, James William Fell, Murray John Adams
Exercise has been demonstrated to have considerable effects upon haemostasis, with activation dependent upon the duration and intensity of the exercise bout. In addition, markers of coagulation and fibrinolysis have been shown to possess circadian rhythms, peaking within the morning (0600-1200 h). Therefore, the time of day in which exercise is performed may influence the activation of the coagulation and fibrinolytic systems. This study aimed to examine coagulation and fibrinolytic responses to short-duration high-intensity exercise when completed at different times of the day...
January 10, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29309387/positive-pressure-ventilation-improves-exercise-performance-and-attenuates-the-fall-of-post-exercise-inspiratory-muscular-strength-in-rower-s-athletes
#8
Thiago R Gonçalves, Pedro Paulo da S Soares
Positive pressure ventilation (PPV) can increase exercise performance in cyclists, but its effects are unclear in other exercise modes, especially those using large muscle mass. The aim of the present study was to compare the exercise performance and post-exercise inspiratory muscles' strength with and without PPV (NO-PPV) during rowing. Nine male rowers (19 ± 1 years) participated in three experimental days (M1, M2, and M3) separated by one week. In M1, rowers performed a 2,000 m test (2k) on a rowing ergometer to obtain average power (W2k)...
January 3, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29308847/comprehensive-overview-of-haemoglobin-mass-and-blood-volume-in-elite-athletes-across-a-wide-range-of-different-sporting-disciplines
#9
Irina Zelenkova, Sergey Zotkin, Pavel Korneev, Sergey Koprov, Alexandr Grushin
BACKGROUND: Comparison of total haemoglobin mass (tHb-mass) and blood volume (BV) across elite athletes different sporting specialisations. METHODS: 222 members of Russian national teams from 12 different disciplines and non Olympic competitive season for tHb-mass, BV, plasma volume (PV), haemoglobin concentration (Hb), and hematocrit level (Hct) determination. tHb-mass measurements were performed using CO-rebreathing technique, alongside Hb and Hct (capillary blood)...
January 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29301367/metabolic-responses-to-carbohydrate-ingestion-during-exercise-associations-between-carbohydrate-dose-and-endurance-performance
#10
Michael L Newell, Gareth A Wallis, Angus M Hunter, Kevin D Tipton, Stuart D R Galloway
Carbohydrate (CHO) ingestion during exercise lasting less than three hours improves endurance exercise performance but there is still debate about the optimal dose. We utilised stable isotopes and blood metabolite profiles to further examine metabolic responses to CHO (glucose only) ingestion in the 20-64 g·h-1 range, and to determine the association with performance outcome. In a double-blind, randomized cross-over design, male cyclists (n = 20, mean ± SD, age 34 ± 10 years, mass 75.8 ± 9 kg, peak power output 394 ± 36 W, VO2max 62 ± 9 mL·kg-1·min-1) completed four main experimental trials...
January 3, 2018: Nutrients
https://www.readbyqxmd.com/read/29284243/lower-extremity-and-spine-pain-in-cyclists
#11
Sylwia Ewa Piotrowska, Marian Majchrzycki, Piotr Rogala, Martyna Mazurek-Sitarz
INTRODUCTION: The number of cyclists increases each year. Some people treat cycling as a passion and practice it at every possible occasion, while for others it is a mean of transport or a form of relaxation at the weekend. However, very few people realize that cycling can also have a negative impact on their health. OBJECTIVE: To assess the prevalence of lower extremity and spine pain in cyclists, and evaluate the influence of various factors causing it. MATERIAL AND METHODS: The study was performed on 167 subjects during amateur cycling competitions in the Greater Poland and Kuyavian-Pomeranian Provinces...
December 23, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/29281560/high-rate-of-return-to-cycling-after-hip-arthroscopy-for-femoroacetabular-impingement-syndrome
#12
Rachel M Frank, Gift Ukwuani, Ian Clapp, Jorge Chahla, Shane J Nho
BACKGROUND: Femoroacetabular impingement syndrome (FAIS) is most commonly diagnosed in athletes who sustain repetitive flexion and rotational loading to their hip. The purpose of this study was to evaluate a patient's ability to return to cycling after hip arthroscopy for FAIS. HYPOTHESIS: There is a high rate of return to cycling after hip arthroscopy. STUDY DESIGN: Retrospective analysis. LEVEL OF EVIDENCE: Level 4...
December 1, 2017: Sports Health
https://www.readbyqxmd.com/read/29277588/sport-related-traumatic-brain-injury-with-and-without-helmets-in-children
#13
Angela Bandte, Friederike-Sophie Fritzsche, Pedram Emami, Getrud Kammler, Klaus Püschel, Kara Krajewski
BACKGROUND: Soccer, bicycling and horseback riding are sports most commonly associated with traumatic brain injury (TBI) in Germany. The latter are commonly practiced with helmets and data on helmet use and usefulness vary widely. METHODS: After ethics approval, retrospective analysis was performed for patients ages 5-17 from 01/2009- 08/2014 based on the diagnosis TBI using the electronic patient file for both university hospital locations. Descriptive data analysis, multi- and univariate logistic regression were employed to calculate the odds ratio...
December 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29276603/varicose-vein-appearance-caused-by-perforating-vein-incompetence-detected-after-intense-cycling
#14
Charlotte E Davies, Angie M White, Mark S Whiteley
The role of incompetent perforating veins in the aetiology of varicose veins is not well understood. Anecdotally, competitive cyclists appeared to be more prone to varicose veins than the general population. We present a case of a 63-year-old amateur competitive cyclist who acutely developed a painful varicosity of her left calf while straining during a hill climb in 106-mile cycle race. Duplex ultrasonography has shown an underlying incompetent perforating vein, feeding the varicosity directly through the underlying muscle...
2017: SAGE open medical case reports
https://www.readbyqxmd.com/read/29249603/negotiating-the-traffic-can-cognitive-science-help-make-autonomous-vehicles-a-reality
#15
Nick Chater, Jennifer Misyak, Derrick Watson, Nathan Griffiths, Alex Mouzakitis
To drive safely among human drivers, cyclists and pedestrians, autonomous vehicles will need to mimic, or ideally improve upon, humanlike driving. Yet, driving presents us with difficult problems of joint action: 'negotiating' with other users over shared road space. We argue that autonomous driving provides a test case for computational theories of social interaction, with fundamental implications for the development of autonomous vehicles.
December 14, 2017: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/29249477/levels-of-ambient-air-pollution-according-to-mode-of-transport-a-systematic-review
#16
Magda Cepeda, Josje Schoufour, Rosanne Freak-Poli, Chantal M Koolhaas, Klodian Dhana, Wichor M Bramer, Oscar H Franco
BACKGROUND: Controversy exists about the differences in air pollution exposure and inhalation dose between mode of transport. We aimed to review air pollution exposure and inhaled dose according to mode of transport and pollutant and their effect in terms of years of life expectancy (YLE). METHODS: In this systematic review, we searched ten online databases from inception to April 13, 2016, without language or temporal restrictions, for cohort, cross-sectional, and experimental studies that compared exposure to carbon monoxide, black carbon, nitrogen dioxide, and fine and coarse particles in active commuters (pedestrian or cyclist) and commuters using motorised transport (car, motorcycle, bus, or massive motorised transport [MMT-ie, train, subway, or metro])...
January 2017: Lancet. Public Health
https://www.readbyqxmd.com/read/29248617/modelling-how-drivers-respond-to-a-bicyclist-crossing-their-path-at-an-intersection-how-do-test-track-and-driving-simulator-compare
#17
Christian-Nils Boda, Marco Dozza, Katarina Bohman, Prateek Thalya, Annika Larsson, Nils Lubbe
Bicyclist fatalities are a great concern in the European Union. Most of them are due to crashes between motorized vehicles and bicyclists at unsignalised intersections. Different countermeasures are currently being developed and implemented in order to save lives. One type of countermeasure, active safety systems, requires a deep understanding of driver behaviour to be effective without being annoying. The current study provides new knowledge about driver behaviour which can inform assessment programmes for active safety systems such as Euro NCAP...
December 14, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/29239696/compression-garments-and-cerebral-blood-flow-influence-on-cognitive-and-exercise-performance
#18
Brittany A Smale, Joseph M Northey, Disa J Smee, Nathan G Versey, Ben Rattray
This study aimed to describe the effect of compression garments on middle cerebral artery blood flow velocity (MCAv) in relation to cognitive and exercise performance whilst cycling. In a randomised-controlled-cross-over design, 15 well-trained male cyclists were recruited to participate in three identical trials wearing loose fitting shorts (control), low-grade, or medium-grade compression garments. The protocol involved four 8 min increments of cycling at 30%, 50%, 70%, and 85% maximal power output and a 4 km time-trial...
December 14, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29237243/exercise-related-severe-cardiac-events
#19
Lourdes Vicent, Albert Ariza-Solé, José Ramón González-Juanatey, Aitor Uribarri, José Ortiz, Esteban López de Sá, Jordi Sans-Roselló, Carlos Tomás Querol, Pau Codina, Iago Sousa-Casasnovas, Manuel Martínez-Sellés
BACKGROUND: Physical activity has benefits on health. However, there is a small risk of effort-related adverse events. The aim of this study is to describe exercise-related severe cardiovascular events and to relate them with the type of sport performed. METHODS: Ten-year retrospective study in 8 Spanish cardiac intensive care units. Adverse cardiac events were defined as acute myocardial infarction, cardiac arrest, or syncope related to physical activity. RESULTS: From 117 patients included, 109 were male (93...
December 13, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29234554/the-influence-of-extrinsic-factors-on-knee-biomechanics-during-cycling-a-systematic-review-of-the-literature
#20
Therese E Johnston, Tiara A Baskins, Rachael V Koppel, Samuel A Oliver, Donald J Stieber, Lisa T Hoglund
Background: The knee is susceptible to injury during cycling due to the repetitive nature of the activity while generating torque on the pedal. Knee pain is the most common overuse related injury reported by cyclists, and intrinsic and extrinsic factors can contribute to the development of knee pain. Purpose: Due to the potential for various knee injuries, this purpose of this systematic review of the literature was to determine the association between biomechanical factors and knee injury risk in cyclists...
December 2017: International Journal of Sports Physical Therapy
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