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https://www.readbyqxmd.com/read/28423987/reproducibility-of-upper-leg-emg-frequency-content-during-cycling
#1
Rodrigo Rico Bini, Camila Peter Hoefelmann, Vitor Pereira Costa, Fernando Diefenthaeler
Reproducibility of frequency content from surface electromyography (sEMG) signals has not been assessed and it is unknown if incremental load testing design could affect sEMG in cycling. The goals of this study were to assess the reproducibility of measures from sEMG frequency content between sessions and to compare these frequency components between a ramp and a step incremental cycling test. Eighteen cyclists performed four incremental load cycling tests to exhaustion. Two tests were performed using a step increment (load started at 100 W for 3 min followed by increments of 30 W every 3 min) and two were performed using a ramp increment (load started at 100 W for 1 min followed by increments of 30 W·min(-1))...
April 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28422547/active-travel-behavior-in-a-border-region-of-texas-and-new-mexico-motivators-deterrents-and-characteristics
#2
Ipek N Sener, Richard J Lee
BACKGROUND: Active travel has been linked with improved transportation and health outcomes, such as reduced traffic congestion and air pollution, improved mobility, accessibility and equity, and increased physical and mental health. The purpose of this study was to better understand active travel characteristics, motivators, and deterrents in the El Paso, Texas, region. METHODS: A multimodal transportation survey brought together elements of transportation and health, with a focus on attitudinal characteristics...
April 19, 2017: Journal of Physical Activity & Health
https://www.readbyqxmd.com/read/28422539/the-effect-of-nitrate-supplementation-on-cycling-performance-in-the-heat-in-well-trained-cyclists
#3
Joseph A McQuillan, Julia R Casadio, Deborah K Dulson, Paul B Laursen, Andrew E Kilding
PURPOSE: The aim of this study was to determine the effect of NO3(-) consumption on measures of perception, thermoregulation and cycling performance in hot conditions. METHODS: Using a randomised, double-blind, crossover-design, 8 well-trained cyclists (mean ± SD: age: 25 ± 8 y, V̇O2peak: 64 ± 5 ml·kg(-1)·min(-1)) performed 2 separate trials, in hot (35°C, 60% relative humidity) environments, having ingested either 140 ml NO3(-)-rich beetroot juice ~8 mmol NO3(-) (NIT), or placebo (PLA), daily for 3-days with a 7-day washout period separating trials...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422523/can-the-lamberts-submaximal-cycle-test-reflect-overreaching-in-professional-cyclists
#4
Lieselot Decroix, Robert P Lamberts, Romain Meeusen
PURPOSE: The Lamberts and Lambert Submaximal Cycle Test (LSCT) consists of 3 stages during which cyclist's cycle for 6 minutes at 60%, 6 minutes at 80% and 3 minutes at 90% of their maximal heart rate, followed by one-minute recovery. It was the aim of this study to determine if the LSCT is able to reflect a state of functional overreaching in professional female cyclists during an 8-day training camp and the following recovery days. METHODS: Six professional female cyclists performed an LSCT on day 1, day 5 and day 8 of the training camp and 3 days after the training camp...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422520/low-level-laser-therapy-improves-performance-and-reduces-fatigue-in-competitive-cyclists
#5
Fábio J Lanferdini, Rodrigo R Bini, Bruno M Baroni, Kelli D Klein, Felipe P Carpes, Marco A Vaz
Evidence supports that low-level laser therapy (LLLT) minimizes fatigue effects on muscle performance. However, the ideal LLLT dosage to improve athletes' performance during sports activities, such as cycling, is still unclear. Therefore, the goal of this study was to investigate the effects of different LLLT dosages on cyclists' performance in time-to-exhaustion tests. In addition, we looked at the effects of LLLT on the frequency content of the EMG signals to assess fatigue mechanisms. Twenty male competitive cyclists participated in a crossover, randomized, double-blind and placebo-controlled trial...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422267/cycling-in-canada
#6
Pamela L Ramage-Morin
This article provides an overview of cycling, including fatalities and bicycle helmet use, based on data from the 1994/1995 National Population Health Survey, the 2013/2014 Canadian Community Health Survey and the Vital Statistics-Death Database. In 2013/2014, an estimated 7.0 million Canadians aged 12 or older (24%) reported cycling in the previous three months, compared with 6.5 million (29%) in 1994/95. The prevalence of cycling declined with age, and was more common among males and people living in higher-income and -education households...
April 19, 2017: Health Reports
https://www.readbyqxmd.com/read/28410328/manipulation-of-muscle-creatine-and-glycogen-changes-dual-x-ray-absorptiometry-estimates-of-body-composition
#7
Julia L Bone, Megan L Ross, Kristyen A Tomcik, Nikki A Jeacocke, Will G Hopkins, Louise M Burke
Standardizing 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 per day for 48 h) as part of a larger study involving a glycogen-depleting exercise protocol...
May 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28409398/middle-cerebral-artery-blood-flow-velocity-during-a-4%C3%A2-km-cycling-time-trial
#8
Ben Rattray, Brittany A Smale, Joseph M Northey, Disa J Smee, Nathan G Versey
PURPOSE: This study sought to describe middle cerebral artery blood flow velocity (MCAv) during a 4 km cycling time trial, and relate it to different pacing strategies adopted by participants. METHODS: After familiarisation and a standardised exercise protocol, 15 male trained cyclists rode a 4 km time trial on a cycling ergometer. MCAv was assessed via transcranial Doppler ultrasound in the right hemisphere at resting baseline, and throughout the time trial. Mean arterial pressure, end-tidal partial pressure of carbon dioxide (PetCO2) and heart rate were assessed alongside MCAv...
April 13, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28406361/predictors-of-performance-in-a-4-h-mountain-bike-race
#9
Andrew R Novak, Kyle J M Bennett, Job Fransen, Ben J Dascombe
This study aimed to cross validate previously developed predictive models of mountain biking performance in a new cohort of mountain bikers during a 4-h event (XC4H). Eight amateur XC4H cyclists completed a multidimensional assessment battery including a power profile assessment that consisted of maximal efforts between 6 and 600 s, maximal hand grip strength assessments, a video-based decision-making test as well as a XC4H race. A multiple linear regression model was found to predict XC4H performance with good accuracy (R(2) = 0...
April 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28405369/game-based-situation-awareness-training-for-child-and-adult-cyclists
#10
Esko Lehtonen, Jasmiina Airaksinen, Kaisa Kanerva, Anna Rissanen, Riikka Ränninranta, Veera Åberg
Safe cycling requires situation awareness (SA), which is the basis for recognizing and anticipating hazards. Children have poorer SA than adults, which may put them at risk. This study investigates whether cyclists' SA can be trained with a video-based learning game. The effect of executive working memory on SA was also studied. Thirty-six children (9-10 years) and 22 adults (21-48 years) played the game. The game had 30 video clips filmed from a cyclist's perspective. Each clip was suddenly masked and two or three locations were presented...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28398947/acidosis-but-not-alkalosis-affects-anaerobic-metabolism-and-performance-in-a-4-km-time-trial
#11
Carlos Rafaell Correia-Oliveira, João Paulo Lopes-Silva, Romulo Bertuzzi, Glenn K McConell, David John Bishop, Adriano Eduardo Lima-Silva, Maria Augusta Peduti Dal'Molin Kiss
PURPOSE: To determine the effect of pre-exercise metabolic acidosis and alkalosis on power output (PO) and aerobic and anaerobic energy expenditure during a 4-km cycling time trial (TT). METHODS: Eleven recreationally trained cyclists (VO2peak 54.1 ± 9.3 mL·kg·min) performed a 4-km TT 100 min after ingesting in a double-blind matter 0.15 g·kg of body mass of ammonium chloride (NH4Cl, acidosis), 0.3 g·kg of sodium bicarbonate (NaHCO3, alkalosis) or 0.15 g·kg of CaCO3 (placebo)...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28391393/dose-effects-of-new-zealand-blackcurrant-on-substrate-oxidation-and-physiological-responses-during-prolonged-cycling
#12
Matthew David Cook, Stephen David Myers, Mandy Lucinda Gault, Victoria Charlotte Edwards, Mark Elisabeth Theodorus Willems
PURPOSE: It has been previously shown that New Zealand blackcurrant (NZBC) extract increased fat oxidation during short duration cycling. The present study examined the effect of different doses of NZBC extract on substrate oxidation and physiological responses during prolonged cycling. METHODS: Using a randomized counterbalanced Latin-square design, 15 endurance-trained male cyclists (age: 38 ± 12 years, height: 187 ± 5 cm, body mass: 76 ± 10 kg, [Formula: see text]: 56 ± 8 mL kg(-1) min(-1), and mean ± SD) completed four separate 120-min cycling bouts at 65% [Formula: see text] after ingesting no dose, or one of three doses (300, 600, or 900 mg day(-1)) of NZBC extract (CurraNZ™) for 7 days...
April 8, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28386237/prediction-of-critical-power-and-w-in-hypoxia-application-to-work-balance-modelling
#13
Nathan E Townsend, David S Nichols, Philip F Skiba, Sebastien Racinais, Julien D Périard
Purpose: Develop a prediction equation for critical power (CP) and work above CP (W') in hypoxia for use in the work-balance ([Formula: see text]) model. Methods: Nine trained male cyclists completed cycling time trials (TT; 12, 7, and 3 min) to determine CP and W' at five altitudes (250, 1,250, 2,250, 3,250, and 4,250 m). Least squares regression was used to predict CP and W' at altitude. A high-intensity intermittent test (HIIT) was performed at 250 and 2,250 m. Actual and predicted CP and W' were used to compute W' during HIIT using differential ([Formula: see text]) and integral ([Formula: see text]) forms of the [Formula: see text] model...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28379266/keto-analogues-and-amino-acids-supplementation-induces-a-decrease-of-white-blood-cell-counts-and-a-reduction-of-muscle-damage-during-intense-exercise-under-thermoneutral-conditions
#14
R C P Lima, S R A S Camerino, T C L França, D S A Rodrigues, M G S Gouveia, A Ximenes-da-Silva, A Bassini, E S Prado, L C Cameron
This study evaluated the acute effect of keto analogue and amino acid (AA-KAAA) supplementation on both white blood cell counts and the established biomarkers of muscle damage during exercise under thermoneutral conditions. Sixteen male cyclists received a ketogenic diet for two days and were divided into two equal groups: a group taking AA-KAAA (KA) or a control group (PL). The athletes performed a two hour cycling session followed by a maximum incremental test until voluntary exhaustion (VExh). Blood samples were obtained at rest and during exercise for further hematological and biochemical analyses...
April 19, 2017: Food & Function
https://www.readbyqxmd.com/read/28368959/the-effects-of-a-cycling-warm-up-including-high-intensity-heavy-resistance-conditioning-contractions-on-subsequent-4-km-time-trial-performance
#15
Alan Chorley, Kevin L Lamb
Prior exercise has been shown to improve subsequent performance via different mechanisms. Sport-specific conditioning contractions can be used to exploit the 'post-activation potentiation' (PAP) phenomenon to enhance performance although this has rarely been investigated in short endurance events. The aim of this study was to compare a cycling warm-up with PAP-inducing conditioning contractions (CW) with a moderate intensity warm-up (MW) on performance and physiological outcomes of 4 km time trial. Ten well-trained male endurance cyclists (V[Combining Dot Above]O2max 65...
March 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28368958/a-field-based-cycling-test-to-assess-predictors-of-endurance-performance-and-establishing-training-zones
#16
Dajo Sanders, Richard J Taylor, Tony Myers, Ibrahim Akubat
This study evaluates the relationship between a field-based 8-min time trial (8MTT) and physiological endurance variables assessed with an incremental laboratory test. Secondly, lactate thresholds assessed in the laboratory were compared to estimated functional threshold power (FTP) from the 8MTT. Nineteen well-trained road cyclists (aged 22 ± 2 yr, height 185.9 ± 4.5 cm, weight 72.8 ± 4.6 kg, VO2max 64 ± 4 ml·min·kg) participated. Linear regression revealed that mean 8MTT power output (PO) was strongly to very strongly related to PO at 4 mmol[BULLET OPERATOR]L, PO at initial rise of 1...
March 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28362628/way-to-go-identifying-routes-for-walkers-and-cyclists-to-avoid-air-pollutants
#17
Carol Potera
No abstract text is available yet for this article.
March 31, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28358644/exercise-addiction-risk-and-health-in-male-and-female-amateur-endurance-cyclists
#18
Carmen Mayolas-Pi, Javier Simón-Grima, Carlos Peñarrubia-Lozano, Diego Munguía-Izquierdo, Diego Moliner-Urdiales, Alejandro Legaz-Arrese
Background and aims To determine the relationship between the risk of exercise addiction (REA) and health status in amateur endurance cyclists. Methods In 859 (751 men and 108 women) cyclists and 718 inactive subjects (307 men and 411 women), we examined the REA (Exercise Addiction Inventory), training status (volume, frequency, experience, and performance), socioeconomic status, quality of life (QoL) (SF-12), quality of sleep (Pittsburgh Sleep Quality Index), anxiety and depression (Hospital Anxiety and Depression Scale), and cardiometabolic risk: body mass index, physical activity (International Physical Activity Questionnaire), physical condition (International Fitness Scale), adherence to the Mediterranean diet (Mediterranean Diet Adherence Screener), alcohol and tobacco consumption...
March 1, 2017: Journal of Behavioral Addictions
https://www.readbyqxmd.com/read/28338371/reliability-and-seasonal-changes-of-submaximal-variables-to-evaluate-professional-cyclists
#19
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
#20
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
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