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Related Concept Videos

Variability: Analysis01:11

Variability: Analysis

954
Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
954

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Related Experiment Video

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Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
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Time to Exhaustion at Traditional Physiological Indicators in Runners: Between-Subject and Between-Day Variability.

Jesus G Pallarés1, Pedro L Valenzuela2,3, Alejandro Martínez-Cava1

  • 1Human Performance and Sports Science Laboratory, University of Murcia, Murcia, Spain.

International Journal of Sports Physiology and Performance
|February 21, 2026
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Summary

Time to exhaustion (TTE) tests at maximum oxygen uptake (V˙O2max), respiratory compensation point (RCP), and maximal lactate steady state (MLSS) show high reliability. These TTE measures are independent of other fitness indicators, suggesting their utility for athlete performance monitoring and training prescription.

Keywords:
endurance trainingmaximal aerobic speedmaximal lactate steady staterespiratory compensation pointventilatory threshold

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Performance Analytics

Background:

  • Maximum oxygen uptake (V˙O2max), respiratory compensation point (RCP), and maximal lactate steady state (MLSS) are key physiological indicators of athletic performance.
  • Limited data exists on the time to exhaustion (TTE) at these specific exercise intensities.
  • Understanding TTE variability and reliability is crucial for effective training and performance assessment.

Purpose of the Study:

  • To analyze the time to exhaustion (TTE) when running at V˙O2max, RCP, and MLSS.
  • To determine the between-subject variability of TTE at these physiological indicators.
  • To assess the within-subject reliability of TTE measurements across different testing occasions.

Main Methods:

  • Thirteen male athletes performed treadmill tests to determine V˙O2max, RCP, and MLSS.
  • Participants completed two separate TTE tests at the speed corresponding to each identified physiological indicator.
  • Physiological and perceptual responses, including blood lactate and heart rate, were monitored during TTE tests.

Main Results:

  • TTE durations were significantly different across the three intensities: 3:38 at V˙O2max, 10:58 at RCP, and 56:42 at MLSS.
  • Moderate between-subject variability was observed for TTE at all intensities, with no significant correlation to speed or V˙O2max.
  • High within-subject reliability was demonstrated for TTE at V˙O2max, RCP, and MLSS, indicated by low coefficients of variation and high intraclass correlation coefficients.

Conclusions:

  • Time to exhaustion tests exhibit high within-subject reliability for V˙O2max, RCP, and MLSS.
  • TTE measurements are independent of traditional performance indicators like speed and V˙O2max.
  • TTE tests are valuable tools for monitoring athlete performance and guiding training prescription.