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Related Concept Videos

Fatigue01:21

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...

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Measuring the Motor Aspect of Cancer-Related Fatigue using a Handheld Dynamometer
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Velocity-specific fatigue: quantifying fatigue during variable velocity cycling.

A Scott Gardner1, David T Martin, David G Jenkins

  • 1Department of Physiology, English Institute of Sport, Manchester, United Kingdom. scott.gardner@eis2win.co.uk

Medicine and Science in Sports and Exercise
|March 12, 2009
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Summary

Accurately measuring fatigue in cycling requires accounting for how pedaling rate affects power output. New methods like the net fatigue index and work deficit provide more precise fatigue quantification in elite sprint cyclists.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biomechanics

Background:

  • Quantifying fatigue in short maximal cycling trials (approx. 30s) traditionally uses a fatigue index.
  • A known power-pedaling rate relationship exists in fatigue-free cycling (<6s).
  • Pedaling rates can change with fatigue during maximal efforts, complicating traditional fatigue index calculations.

Purpose of the Study:

  • To quantify fatigue in elite cyclists while accounting for the influence of pedaling rate on power output.

Main Methods:

  • Eight world-class male sprint cyclists performed 200-m time trials using SRM power meters.
  • Maximal power-pedaling rate relationships were established from initial acceleration data.
  • Fatigue was quantified using the traditional fatigue index, a modified net fatigue index, and work deficit.

Main Results:

  • The traditional fatigue index (55.4%) was significantly higher than the net fatigue index (41.0%).
  • The power-pedaling rate relationship explained 14.3% of the traditional fatigue index.
  • Work deficit (23.3%) was significantly lower than both fatigue measures.

Conclusions:

  • The net fatigue index and work deficit offer more precise fatigue quantification during variable velocity cycling by accounting for the power-pedaling rate relationship.
  • These refined measures are valuable for comparing fatigue across different protocols, including elite sprint cycling competitions.
  • Precise fatigue quantification can enhance the evaluation of training status, gear selection, and fatigue resistance in competitive cycling.