17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1124
Session: [OP-PM32] TT Cycling tests
Lecture room: M1
Date & time: 09.07.2016 / -
Title of the paper: Effect of pedal rate during time trial on oxygen uptake kinetics in a subsequent running task
Authors: Waldhuber, F., Nimmerichter, A.
Institution: University of Applied Sciences Wiener Neustadt
Department: Training and Sport
Country: Austria
Abstract text Introduction Previous studies reported an increase in running time-to-exhaustion after 30 min cycling at a cadence of 75 rpm compared with 95 and 109 rpm (Vercruyssen et al. 2005). The aim of the present study was to analyze whether the pedal rate in cycling time trial affects parameters of oxygen uptake kinetics in a subsequent running task under laboratory conditions. Methods Ten male endurance trained subjects (mean+-SD, age: 27.5+-4.8yr, body mass: 76.2+-8.8kg, VO2max: 62.1+-6.0ml/kg/min) performed three laboratory trials. The subjects completed a graded exercise test (GXT) on a treadmill and two trials consisting of a time trial (360 kJ) and a running task. The time trials were conducted at a cadence of 60 and 90 rpm in the linear mode of the Lode Excalibur ergometer. Immediately after the time trials the subjects were asked to change into their running shoes and to complete a 6-min running task on the treadmill at an intensity of the respiratory compensation point obtained from the GXT. Oxygen uptake was measured breath-by-breath using a Cortex gas analyser. Nonlinear least square regression analyses were used to resolve the time constant, the amplitude and the time delay of the primary phase. A paired-samples t-test was used for statistical analyses. Results The time to complete the time trials were 1153+-141s and 1201+-179s at 60 and 90 rpm, respectively (t (9) = -2.88, p = 0.018). There were no significant differences between the 60 and 90 rpm for the time constant (31.3+-6.8s vs. 33.3+-5.8s; t (9) = -2.1, p = 0.066), the amplitude (2.59+-0.37 L/min vs 2.56+-0.36 L/min; t (9) = 0.82, p = 0.433), the time delay (17.9+-4.9s vs. 16.6+-4.2s; t (9) = 0.90, p = 0.391) and the end-exercise oxygen consumption (4.29+-0.56L/min vs. 4.28+-0.63L/min) during the 6-min treadmill running task. Discussion The results of the present study support previous findings where improvements in power output and gross efficiency during cycling at 60 compared with 90 and 100 rpm have been reported (Nimmerichter et al. 2012; Nimmerichter et al. 2015). The significantly faster time to complete a 360 kJ time-trial at 60 compared with 90 rpm, does not affect parameters of oxygen uptake kinetics in a subsequent running task. Although the improvement in cycling time-trial performance does not impair the initial oxidative response during submaximal running, the effects on subsequent performance during a running time-trial, remains to be shown. References Nimmerichter A, Eston R, Bachl N, Williams C (2012) Effects of low and high cadence interval training on power output in flat and uphill cycling time-trials. Eur J Appl Physiol 112 (1):69-78. Nimmerichter A, Prinz B, Haselsberger K, Novak N, Simon D, Hopker JG (2015) Gross Efficiency During Flat and Uphill Cycling in Field Conditions. Int J Sports Physiol Perform 10 (7):830-834. Vercruyssen F, Suriano R, Bishop D, Hausswirth C, Brisswalter J (2005) Cadence selection affects metabolic responses during cycling and subsequent running time to fatigue. Br J Sports Med 39 (5):267-272. Contact felix.waldhuber@fhwn.ac.at
Topic: Physiology
Keyword I: oxygen uptake kinetics
Keyword II: time trial
Keyword III: running