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Related Concept Videos

Fatigue01:21

Fatigue

220
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...
220
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

2.2K
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...
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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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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...
235

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Defining and quantifying fatigue in the rugby codes.

Mitchell Naughton1,2,3, Tannath Scott4,5, Dan Weaving4

  • 1School of Health and Behavioural Sciences, University of the Sunshine Coast, Sippy Downs, Queensland, Australia.

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Rugby fatigue is defined as reduced performance ability due to changes in cognitive, neuromuscular, and physiological domains. Experts agreed on key metrics like jump power and heart rate variability for monitoring player recovery.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Performance Analysis

Background:

  • Rugby demands significant physical, perceptual, and technical efforts, leading to player fatigue.
  • Existing definitions of fatigue do not account for rugby's specific demands (e.g., collisions, locomotor loads).
  • Methods for quantifying post-match fatigue and recovery in rugby are not well-established.

Purpose of the Study:

  • To establish a consensus-based definition of fatigue specific to rugby.
  • To identify expert agreement on this definition.
  • To determine important and feasible methods/metrics for quantifying post-match fatigue in rugby.

Main Methods:

  • A two-round online Delphi questionnaire administered to subject matter experts (SMEs).
  • Round one involved 42 SMEs; round two involved 23 SMEs.
  • Analysis of SME responses to derive and refine a definition and identify key monitoring tools.

Main Results:

  • A consensus definition of rugby fatigue was achieved with 96% agreement.
  • Fatigue is defined as reduced performance ability linked to changes across cognitive, neuromuscular, perceptual, physiological, emotional, and technical/tactical domains.
  • 33 items across neuromuscular, cardio-autonomic, and self-report domains reached consensus for importance/feasibility, including countermovement jump, heart rate variability, and subjective measures (soreness, mood, sleep).

Conclusions:

  • A novel, expert-validated definition of fatigue in rugby has been developed.
  • Key objective (e.g., countermovement jump, HRV) and subjective (e.g., soreness, mood) measures are recommended for fatigue monitoring.
  • A practical monitoring system and recommendations for implementation are provided for rugby practitioners.