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Exercise Stress Test01:26

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Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
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Using Near-Infrared Spectroscopy Wearable Devices to Identify Central Versus Peripheral Limitations During Exercise
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Detecting mechanical breakpoints during treadmill-based graded exercise test: Relationships to ventilatory

Siu Nam Li1, Peter Peeling1,2, Clint Hansen3

  • 1School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Australia.

European Journal of Sport Science
|August 2, 2021
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Summary

Running mechanics change during graded exercise tests, with mechanical breakpoints appearing later than ventilatory thresholds. These running changes are not strongly related to ventilatory thresholds, suggesting distinct physiological processes.

Keywords:
Running mechanicsbreakpointgraded exercise testinstrumented treadmill

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Running Dynamics

Background:

  • Cardio-respiratory changes during graded exercise tests (GXTs) are well-documented.
  • Running mechanical alterations during GXTs are less understood.

Purpose of the Study:

  • To identify mechanical breakpoints during treadmill GXT.
  • To compare the timing of mechanical breakpoints with ventilatory thresholds.

Main Methods:

  • Recreational runners underwent continuous GXT on an instrumented treadmill.
  • Ventilatory thresholds (VT1 and VT2) were determined from expired gases.
  • Mechanical breakpoints were identified using a linear fit process on spatio-temporal, force, and spring-mass model variables.

Main Results:

  • Mechanical breakpoints were observed in most variables (15/16) between 61.9% and 82.3% of GXT duration, occurring significantly after VT1.
  • Eight mechanical variables showed breakpoints at a similar time to VT2.
  • Relationships between mechanical breakpoints and ventilatory thresholds were weak.

Conclusions:

  • Mechanical breakpoints are detectable in the majority of running variables during GXT.
  • These mechanical changes do not correlate strongly with ventilatory thresholds.
  • Leg stiffness was the only variable without a detectable breakpoint.