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Fatigue

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 Fatigue

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...

Factors Affecting Illness

Factors Affecting Illness

When a person's physical, emotional, intellectual, social development or spiritual functioning is compromised, this deviation from a healthy normal state is called illness. Illness creates stress that in turn harms individuals. Irritation, anger, denial, hopelessness, and fear are behavioral and emotional changes an individual experiences in the phases of illness. A variety of factors influence a person's health and well-being.
For instance, risk factors are connected to illness, disability,...

Insufficient Sleep and Sleep Deprivation

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...

Factors Affecting Respiration

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:

Stress: General Loading Conditions

Stress: General Loading Conditions

To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.

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Related Experiment Video

Updated: Jun 30, 2026

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

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

Published on: May 31, 2016

Factors associated with intern fatigue.

Lindsay D Friesen¹, Arpana R Vidyarthi, Robert B Baron

¹Department of Medicine, University of Virginia Health System, Charlottesville, VA 22908, USA. jd2d@virginia.edu

Journal of General Internal Medicine

|September 23, 2008

Summary

This summary is machine-generated.

Intern fatigue is linked to poor sleep and high stress, not just duty hours. Improving sleep quality and teamwork are key to reducing fatigue in medical residents.

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Area of Science:

Medical Education
Resident Well-being
Patient Safety

Background:

Fatigue negatively impacts patient safety and resident well-being.
Accreditation Council for Graduate Medical Education (ACGME) duty hour limitations aimed to reduce resident fatigue.
Factors contributing to intern fatigue remain unclear.

Purpose of the Study:

Identify factors associated with intern fatigue.
Investigate the impact of duty hour limitations on intern fatigue.

Main Methods:

Cross-sectional confidential survey using validated questions on fatigue, sleep, and stress.
Included author-developed teamwork assessment questions.
Multivariate linear regression analysis of intern data.

Main Results:

Poorer sleep quality and higher perceived stress were significantly associated with intern fatigue.
Higher perceived stress correlated with diminished sleep quality.
Poorer teamwork was significantly associated with increased perceived stress.

Conclusions:

Reducing duty hours alone may not sufficiently decrease intern fatigue.
Residency programs should implement changes to reduce stress and improve sleep and teamwork.
Addressing these factors is crucial for mitigating intern fatigue and its adverse effects.