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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...
Relative Risk01:12

Relative Risk

Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Hazard Rate01:11

Hazard Rate

The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...

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Related Experiment Video

Updated: May 8, 2026

Measuring the Motor Aspect of Cancer-Related Fatigue using a Handheld Dynamometer
07:22

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Risk and effort measures of fatigue.

C A Shingledecker1, D H Holding

  • 1a Department of Psychology , University of Louisville.

Journal of Motor Behavior
|August 17, 2013
PubMed
Summary

This study introduces a novel fatigue measurement method using choice-based tasks. Fatigued individuals opted for easier, riskier options and made more errors, validating the method.

Area of Science:

  • Psychology
  • Human Factors
  • Cognitive Science

Background:

  • Measuring fatigue accurately is crucial for understanding performance decrements.
  • Existing fatigue assessment methods may lack sensitivity or objectivity.

Purpose of the Study:

  • To propose and validate a new method for measuring fatigue.
  • To investigate how fatigue influences decision-making under risk.

Main Methods:

  • Developed a task with alternative routes varying in effort and success probability.
  • Induced fatigue using a synthetic work battery.
  • Compared choices and error rates of fatigued and control groups.

Main Results:

  • Fatigued participants shifted choices to easier, riskier routes.

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The Treadmill Fatigue Test: A Simple, High-throughput Assay of Fatigue-like Behavior for the Mouse
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The Treadmill Fatigue Test: A Simple, High-throughput Assay of Fatigue-like Behavior for the Mouse

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  • An increased error rate was observed in fatigued participants.
  • Task measurements correlated with self-rated fatigue levels.

    • Conclusions:

    • The proposed method effectively measures experimentally induced fatigue.
    • Fatigue impairs decision-making, leading to riskier choices and increased errors.
    • This task offers a sensitive and objective measure of subjective fatigue.