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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
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Changes in torque complexity and maximal torque after a fatiguing exercise protocol.

João Oliveira1, Nuno Casanova2, João S Gomes1

  • 1Neuromuscular Research Lab, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal.

Sports Biomechanics
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Summary
This summary is machine-generated.

Fatigue reduces plantar flexor torque complexity and maximal torque. These measures recover independently, suggesting they are distinct physiological responses to fatigue and not correlated.

Keywords:
Non-linear dynamicsentropyfatigueregularityvariability

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Area of Science:

  • Biomechanics
  • Motor Control
  • Exercise Physiology

Background:

  • Torque output complexity, a measure of temporal fluctuations, changes with fatigue, typically becoming more regular.
  • Previous research indicates distinct recovery patterns for torque complexity and maximal torque post-fatigue.
  • The muscle dependency and correlation between these recovery patterns remain unclear.

Purpose of the Study:

  • To investigate the effects of a fatiguing protocol on plantar flexor torque complexity and maximal torque.
  • To examine the relationship between changes in torque complexity and maximal torque following fatigue.
  • To determine if recovery patterns are muscle-dependent.

Main Methods:

  • Ten participants underwent a fatiguing protocol affecting one leg's plantar flexors.
  • Measures of maximal voluntary contraction, isometric contractions, and pain pressure threshold were collected at baseline, immediately post-fatigue, 1-hour, and 24-hours post-fatigue.
  • Statistical analyses included two-way ANOVAs and correlation analyses.

Main Results:

  • The fatiguing protocol significantly decreased both torque complexity (approximately 35%) and maximal torque (approximately 20%).
  • Torque complexity and maximal torque demonstrated uncoupled recovery patterns over the 24-hour period.
  • Correlation analysis revealed no significant relationship between the changes in torque complexity and maximal torque.

Conclusions:

  • Torque complexity and maximal torque are independently affected by fatigue and exhibit distinct recovery trajectories.
  • These findings suggest that torque complexity and maximal torque are independent physiological parameters in the context of muscle fatigue.
  • The results highlight the need to consider these parameters separately when assessing neuromuscular function and recovery.