Reliability of Laboratory Endurance Tests

Krebs, Peter; Powers, S. K.

doi:10.1249/00005768-198004001-00057

Cited by 14 publications

(20 citation statements)

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“…Such an exercise protocol should ideally be robust to learning effect that may mask any possible changes in performance and also ecologically valid in order to be as close as possible to real athletic competition events. In terms of endurance exercise, protocols of constant pace to volitional fatigue have been criticised for possessing low reliability (Billat, Renoux, Pinoteau, Petit, & Koralsztein, 1994;Jeukendrup, Saris, Brouns, & Kester, 1996;Krebs & Powers, 1989;McLellan, Cheung, & Jacobs, 1995) and for lacking of ecological validity (Tyler & Sunderland, 2008). Jeukendrup et al (1996) and also Krebs and Powers (1989) reported remarkably poor reproducibility of continuous exercise protocols to exhaustion with coefficient of variation (CV) 26.6 and 20.3, respectively.…”

Section: Variability Of Performance During a 60-min Running Racementioning

confidence: 99%

Variability of performance during a 60-min running race

Chryssanthopοulos

Ziaras

Zacharogiannis

et al. 2015

Journal of Sports Sciences

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The aim of the present study was to examine the variability of 1-h running performance outside the laboratory, under conditions simulating those of a real competitive event. Twenty-three male recreational runners performed on 3 occasions a 60-min simulated running race attempting to cover as long distance as possible. The races took place in an indoor track, in order to ensure stable environmental conditions. There was no difference in the distance covered between races (12,546.3 ± 217 m, 12,576 ± 219.1 m, 12,638.7 ± 225.3 m for the 1st, 2nd and 3rd races, respectively (mean ± S(X), F(2, 44) = 1.168, P = 0.32). The coefficient of variation for all participants was 1.5 ± 0.2 (range: 0.2-3.00). Multiple regression analysis indicated that 83% of the variability in best performance was predicted by determining the speed at the peak volume of oxygen uptake and body mass. In conclusion, performance during 1-h simulated running race in an indoor track was highly reproducible. The present study can be used as low-cost, time-efficient and ecologically valid tool, which could test simultaneously numerous runners' performance under conditions similar to real competitive events.

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Section: Variability Of Performance During a 60-min Running Racementioning

confidence: 99%

Variability of performance during a 60-min running race

Chryssanthopοulos

Ziaras

Zacharogiannis

et al. 2015

Journal of Sports Sciences

View full text Add to dashboard Cite

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“…In broad terms, these tests either measure time to exhaustion at a given workload (Krebs and Powers 1989;Laursen et al 2003b;McLellan et al 1995), measure the time to complete a given amount of work (Hickey et al 1992;Jeukendrup et al 1996), measure the average work done during a given time frame (Bishop 1997;Coyle et al 1991), or the test is a simulated time trial (TT) in which the goal is to cover a given distance in as short a time as possible (Balmer et al 2000;Jensen and Johansen 1998;Palmer et al 1996;Schabort et al 1998;Smith et al 2001;Sporer and McKenzie 2007;Zavorsky et al 2007). Historically, the simulated time trials are accomplished by placing the subject's bicycle onto either an air or magnetically braked stationary trainer, and distance is measured by revolutions of the rear wheel.…”

Section: Introductionmentioning

confidence: 99%

The reliability of a simulated uphill time trial using the Velotron electronic bicycle ergometer

2010

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This study was conducted to measure the reliability of an indoor uphill time trial (TT) using the Velotron electronic bicycle ergometer with a computer-generated pacer that represented a subject's prior TT performance. A total of 12 trained cyclists (42 ± 7.79 years, 63.0 ± 6.12 ml/kg/min) completed three 8-mile uphill TT with 2-7 days between subsequent tests. A repeated measure ANOVA found no difference between finishing times for TT1 (2,154 ± 246 s) and TT2 (2,078 ± 185 s, p = 0.055) or TT2 and TT3 (2,047 ± 167 s, p = 0.075). All measures of reliability showed an increased reliability for finishing times in TT2-TT3 [95% CI for: coefficient of variation (CV) = 1.0-2.3%, intraclass correlation coefficient (ICC) = 0.953-0.996, standard error of measurement (SEM) = 2.1-4.9 s] versus TT1-TT2 (95% CI for: CV = 2.0-4.9%, ICC = 0.827-0.986, SEM = 9.8-23 s). An uphill TT using the Velotron bicycle ergometer with a prior performance as a pacer is a reliable assessment for indoor TT performance testing, but a familiarization trial improves reliability. Although there were no significant differences found for completion times between TT1-TT2 or TT2-TT3, the absolute mean differences, small sample size and low p values may be suggestive of a Type II error.

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“…Others have shown time trial protocols to have a CV as low as 1% (Laursen et al 2003;Palmer et al 1996;Smith et al 2001) and time to exhaustion protocols to have a CV between 5.2 (Maughan et al 1989) and 55% (Krebs and Powers 1989).…”

Section: Introductionmentioning

confidence: 99%

Reliability of a cycling time trial in a glycogen-depleted state

2006

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The aim of this study was to investigate the reliability of a protocol designed to simulate endurance performance in events of long duration (approximately 5 h) where endogenous carbohydrate stores are low. Seven male subjects were recruited (age 27 +/- 7 years, VO(2max) 66 +/- 5 ml/kg/min, W (max) 367 +/- 42 W). The subjects underwent three trials to determine the reliability of the protocol. For each trial subjects entered the laboratory in the evening to undergo a glycogen-depleting exercise trial lasting approximately 2.5 h. The subjects returned the following morning in a fasted state to undertake a 1-h steady-state ride at 50% W (max) followed by a time trial of approximately 40-min duration. Each trial was separated by 7-14 days. The trials were analysed for reliability of time to completion of the time trial using a coefficient of variation (CV), with 95% confidence intervals (data are mean +/- SD). The times to complete the three trials were 2,546 +/- 529, 2,585 +/- 490 and 2,568 +/- 555 s for trials 1, 2 and 3, respectively. The CV between trials 1 and 2 was 4.5% (95% CI 2.9-10.4%) and between trials 2 and 3, 3.8% (95% CI 2.4-9.9%). There was no difference in oxygen uptake, respiratory exchange ratio, carbohydrate oxidation, fat oxidation, plasma glucose concentration and plasma lactate concentration between the three trials. Therefore we can conclude that prior glycogen depletion does produce a reliable measure of performance with metabolic characteristics similar to ultraendurance exercise.

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Reliability of Laboratory Endurance Tests

Cited by 14 publications

References 0 publications

Variability of performance during a 60-min running race

Variability of performance during a 60-min running race

The reliability of a simulated uphill time trial using the Velotron electronic bicycle ergometer

Reliability of a cycling time trial in a glycogen-depleted state

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