Reproducibility of ventilation of thresholds in trained cyclists during ramp cycle exercise

Weston, Shane B; Gabbett, Tim J.

doi:10.1016/s1440-2440(01)80044-x

Cited by 65 publications

(38 citation statements)

References 18 publications

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“…The first (aerobic level -AeL) and second ventilatory thresholds level (Anaerobic level -AnL) were estimated by methods described and validated by Weston and Gabbett (2001). The indicators for AeL were: the first nonlinear increases in the VE curve; the first increase VE/Vo2 curve while the VE/Vco2 slope remains constant; the inflexion point between Vo2 and Vco2.…”

Section: Methodsmentioning

confidence: 99%

Cycling specific postural stability during incremental exercise. The relationship with cyclists functional movement screen score

Rannama

Pedak

Bazanov

et al. 2017

jhse

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The purpose of this study was to characterise the changes in the power of the normalised ground reaction forces and COP swaying, as measures of the cycling stability and effectiveness of full body motion during an incremental cycling exercise; and to examine the relationships between cycling specific postural stability and cyclists ability to perform functional movements, measured by the FMS test.38 competitive road cyclists (19.2±2.3 yrs., 181.7±6.6 cm, 74.3±7.3 kg) performed Functional Movement Screen (FMS) test to evaluate their musculoskeletal state. Experimental cycling exercise was performed using the cyclist's personal racing bikes mounted on the cycling ergometer Cyclus 2, which were fixed on two Kistler 9286B force plate. The 6 ground reaction force (GRF) components (3 linear and 3 angular), COP movement deviation and sway velocity were measured during incremental cycling exercise (step 2 min, increment 25W). Postural stability measures were calculated as power corrected standard deviations of center of pressure (COP) and GRF components signals during 30 sec cycling in every incremental step. The paired t-test was used to control differences in postural stability measures between intensity levels and correlation analyses was used to evaluate relationships between postural stability and FMS scores. Results of the study indicate that most integrative cycling specific posture stability measure is COP sway velocity that is also most sensitive predictor of cyclist's musculoskeletal state, measured by the FMS test. During an incremental cycling exercise the power normalised postural swaying decreased up to the intensity at the level of anaerobic threshold and during the level of the maximal aerobic power the postural stability decreased significantly.

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Section: Methodsmentioning

confidence: 99%

Cycling specific postural stability during incremental exercise. The relationship with cyclists functional movement screen score

Rannama

Pedak

Bazanov

et al. 2017

jhse

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“…Prior to the incremental test, the O2 and CO2 analysers were calibrated using medical grade gases of known concentration that spanned the physiological range. Gas exchange data were analysed to define the V O2MAX and second ventilatory threshold (VT2), following descriptions from Weston and Gabbett 16 .…”

Section: Protocolmentioning

confidence: 99%

Differences in Pedaling Technique in Cycling: A Cluster Analysis

Lanferdini¹,

Bini²,

Figueiredo³

et al. 2016

International Journal of Sports Physiology and Performance

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The purpose of this study was to employ cluster analysis to assess if cyclists would opt for different strategies in terms of neuromuscular patterns when pedalling at the power output of their second ventilatory threshold (POVT2) compared to cycling at their maximal power output (POMAX). Twenty athletes performed an incremental cycling test to determine their power output (POMAX and POVT2; first session) and pedal forces, muscle activation, muscle-tendon unit length, and vastus lateralis architecture (fascicle length, pennation angle, and muscle thickness) were recorded (second session) in POMAX and POVT2. Athletes were assigned to two clusters based on the behaviour of outcome variables at POVT2 and POMAX using cluster analysis. Clusters #1 (n=14) and #2 (n=6) showed similar power output and oxygen uptake. Cluster #1 presented larger increases in pedal force and knee power than Cluster #2, without differences for the index of effectiveness. Cluster #1 presented less variation in knee angle, muscle-tendon unit length, pennation angle and tendon length compared to Cluster #2. However, Clusters #1 and #2 showed similar muscle thickness, fascicle length and muscle activation. When cycling at POVT2 versus POMAX, cyclists could opt for keeping a constant knee power and pedal force production, associated with an increase in tendon excursion and a constant fascicle length. In conclusion, increases in power output lead to greater variations in knee angle, muscle-tendon unit length, tendon length, and pennation angle of vastus lateralis for a similar knee extensor activation and smaller pedal force changes in cyclists from Cluster #2 compared to Cluster #1.

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Section: Reliabilität Der Wichtigsten Größen Der Fahrradergospirometrieunclassified

“…%SEM = 4,8 -6,8 und VT 2: ICC = 0,96) [26,27,41,42]. Zu beachten ist jedoch eine Studie, die als Ergebnis einen geringeren ICC bezüglich der VT 1 aufweist (VT 1: ICC = 0,77; %SEM = 6,1 und VT 2: ICC = 0,93; %SEM = 3,3) [42]. Bei dieser Studie ist allerdings zu berücksichtigen, dass die VT 1 und die VT 2 automatisch mit einer Software bestimmt wurden [42] und somit im Gegensatz zu unserer Studie auf eine Plausibilitätsprüfung durch erfahrene Untersucher verzichtet wurde [13,26].…”

Section: Reliabilität Der Wichtigsten Größen Der Fahrradergospirometrieunclassified

Reliabilität ausgewählter Parameter der Fahrradergospirometrie anhand des PowerCube-Ergo-Atemgasanalysators

Hoppe

Sperlich

Baumgart

et al. 2015

Sportverletz Sportschaden

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This study aimed to investigate the reliability of 1) the key parameters of cycling ergospirometry (maximum power output [Pmax] and oxygen uptake [V̇O2peak], ventilatory thresholds 1 [VT 1] and 2 [VT 2], and cycling efficiency [CE] and gross efficiency [GE]), 2) the commonly used parameters to quantify exhaustion (maximum heart rate [HFmax], respiratory quotient [RQmax], blood lactate concentration [BLAmax], and ratings of perceived exhaustion [RPEmax]), and 3) the kinetics of exercise induced gas exchange measurements (oxygen uptake [V̇O2], carbon dioxide output [V̇CO2], and minute ventilation [V̇E]) using the PowerCube-Ergo metabolic system in consideration of international statistical recommendations. 12 women and 12 men (28 ± 4 years; 23.2 ± 2.4 kg/m(2)) performed two cycling tests (20 watt/min) separated by one week. The reliability was calculated based on differences in means (t test and effect sizes), retest correlation (intraclass correlation coefficient [ICC]), and within-subject variation (standard error of measurement [SEM]). Of the key parameters of cycling ergospirometry, an excellent reliability (ICC ≥ 0.969; p = 0.000) and high accuracy (%SEM ≤ 4.6) were found for Pmax, V̇O2peak, and VT 1. Of the most commonly used parameters to quantify exhaustion, an excellent reliability (ICC = 0.922; p = 0.000) and high accuracy (%SEM = 1.0) existed only for HFmax. The gas exchange measurements (V̇O2, V̇CO2 und V̇E) of the PowerCube-Ergo were all excellently reliable (ICC ≥ 0,991; p = 0.000) and the accuracy of V̇O2 (SEM = 0.10 l/min) and V̇E (SEM = 3.13 l/min) fulfilled the quality guidance of exercise physiology laboratories. For future studies and practical purposes, the results are vital for the decision as to whether a difference between two tests represents a true intervention effect or just a measurement error and for the estimation of required sample sizes.

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Reproducibility of ventilation of thresholds in trained cyclists during ramp cycle exercise

Cited by 65 publications

References 18 publications

Cycling specific postural stability during incremental exercise. The relationship with cyclists functional movement screen score

Cycling specific postural stability during incremental exercise. The relationship with cyclists functional movement screen score

Differences in Pedaling Technique in Cycling: A Cluster Analysis

Reliabilität ausgewählter Parameter der Fahrradergospirometrie anhand des PowerCube-Ergo-Atemgasanalysators

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