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Related Concept Videos

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...
Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
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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...
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Related Experiment Video

Updated: Jul 10, 2026

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
14:02

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Published on: November 1, 2012

Impaired calcium release during fatigue.

D G Allen1, G D Lamb, H Westerblad

  • 1School of Medical Sciences and Bosch Institute, Univ. of Sydney F13, NSW 2006, Australia. davida@physiol.usyd.edu.au

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 27, 2007
PubMed
Summary

Muscle fatigue involves impaired calcium release from the sarcoplasmic reticulum (SR). Caffeine can help assess this, but new methods are needed to study it in whole muscles and pinpoint causes.

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Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers
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Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers

Published on: February 24, 2014

Related Experiment Videos

Last Updated: Jul 10, 2026

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
14:02

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Published on: November 1, 2012

Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers
11:22

Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers

Published on: February 24, 2014

Area of Science:

  • Exercise Physiology
  • Skeletal Muscle Biology
  • Cellular Physiology

Background:

  • Impaired calcium release from the sarcoplasmic reticulum (SR) contributes to skeletal muscle fatigue.
  • Caffeine can augment SR Ca(2+) release, serving as a tool to study fatigue mechanisms.

Purpose of the Study:

  • To explore proposed mechanisms of impaired SR Ca(2+) release during muscle fatigue.
  • To highlight the need for methods to assess SR Ca(2+) release in intact muscles.

Main Methods:

  • Review of proposed mechanisms for impaired SR Ca(2+) release.
  • Discussion of the role of action potential amplitude, intracellular ATP, Mg(2+), and inorganic phosphate.

Main Results:

  • Several factors contribute to impaired SR Ca(2+) release, including reduced action potential amplitude, decreased SR Ca(2+) channel effectiveness due to low ATP and high Mg(2+), and Ca(2+) precipitation within the SR.

Conclusions:

  • Understanding muscle fatigue requires distinguishing between various causes of impaired SR Ca(2+) release.
  • Development of techniques to study SR Ca(2+) release in intact, perfused muscles is crucial for future research.