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Characterization of performance fatigability during a self-paced exercise.

Rafael de Almeida Azevedo1,2, Ramon Cruz1, Patrícia Couto1

  • 1Endurance Performance Research Group, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 19, 2019
PubMed
Summary

Performance fatigability in self-paced cycling occurs early, with significant muscle activation and contractile function impairments during the initial fast-start phase. These deficits persist throughout the even-pace and end-spurt phases of the time trial.

Keywords:
central fatigueelectromyographyexercise intensity domainsmuscle recruitmentperipheral fatiguepower output

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Muscle Physiology

Background:

  • Self-paced exercise performance fatigability is not well understood.
  • Understanding pacing strategies is crucial for optimizing athletic performance.
  • Previous research focused on externally paced events, leaving a gap in knowledge for self-regulated exertion.

Purpose of the Study:

  • To characterize the time course of performance fatigability during a self-paced 4-km cycling time trial.
  • To investigate changes in muscle activation and contractile function throughout different phases of the trial.
  • To differentiate fatigability patterns between fast-start, even-pace, and end-spurt segments.

Main Methods:

  • Eleven male cyclists completed three counterbalanced 4-km time trials (fast-start, even-pace, end-spurt).
  • Performance fatigability assessed via isometric maximal voluntary contractions (IMVCs).
  • Muscle activation (VA) and knee extensor contractile function (TwPt) measured using evoked contractions before and after trial segments. EMG/PO, gas exchange, and power output were also recorded.

Main Results:

  • A significant drop in IMVC (-12%), VA (-8%), and TwPt (-23%) occurred during the fast-start phase.
  • No further significant decrements in IMVC, VA, or TwPt were observed during the even-pace or end-spurt phases.
  • Muscle activation and contractile function impairments were established early and maintained throughout the self-paced time trial.

Conclusions:

  • Performance fatigability in self-paced cycling is primarily driven by early-onset impairments in muscle activation and contractile function.
  • These initial deficits are sustained throughout the duration of the exercise.
  • Findings provide novel insights into the physiological underpinnings of self-paced exercise performance and fatigability.