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Exercise Stress Test

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes

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Related Experiment Video

Updated: Apr 30, 2026

Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans

Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans

Published on: October 17, 2018

Test-Retest Reliability of Physiological Resilience During and After Prolonged Moderate-Intensity Running in

Timi Malinen¹, Olli-Pekka Nuuttila^1,2, Pekka Matomäki^1,3

¹Faculty of Sports and Health Sciences, University of Jyväskylä, Jyväskylä, Finland.

European Journal of Sport Science

|April 28, 2026

Summary

This study found that changes in maximal speed and drifts in running economy and heart rate are reliable measures of physiological resilience in runners. Absolute physiological values remain reliable even when fatigued.

Keywords:

durability endurance performance endurance running fatigue resistance reliability

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Area of Science:

Exercise Physiology
Sports Science
Human Performance

Background:

Physiological resilience is typically assessed by the decline in physiological markers during extended exercise.
Evaluating the consistency of these measurements over time is crucial for accurate assessment.

Purpose of the Study:

To determine the test-retest reliability of physiological resilience metrics during prolonged moderate-intensity running.
To identify the most reliable indicators of physiological resilience in well-trained endurance runners.

Main Methods:

Twenty-six endurance runners completed two identical ~2.5-hour running tests at ~89% of ventilatory threshold 1 speed, separated by 13 days.
Physiological profiles were measured in non-fatigued, during, and post-exercise states.
Reliability was quantified using intraclass correlation coefficients (ICC), coefficient of variations (CV%), and typical errors (TE).

Main Results:

Changes in maximal speed (sPeak) demonstrated good reliability (ICC: 0.81).
Drifts in running economy (RE) and heart rate (HR) showed moderate to good reliability (ICC: 0.52-0.80).
Changes in maximal oxygen uptake (VO2max) and ventilatory thresholds (VTs) had poor reliability (ICC: 0.07-0.36), though absolute values in a fatigued state were highly reliable (ICC > 0.83).

Conclusions:

Assessing physiological resilience through changes in sPeak and drifts in RE and HR is most reliable.
Absolute physiological measurements remain reliable even in a fatigued state.
More demanding protocols might be necessary to reliably measure the deterioration aspect of physiological resilience.