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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Generation of Action Potential in Skeletal Muscles01:24

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Isotonic and Isometric Muscle Contractions01:22

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Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while...
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Muscle Contraction01:15

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Muscle Contraction01:10

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In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive...
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A Murine Model of Muscle Training by Neuromuscular Electrical Stimulation
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Exercise: Teaching myocytes new tricks.

Scott K Powers1

  • 1Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida spowers@hhp.ufl.edu.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 3, 2017
PubMed
Summary
This summary is machine-generated.

Endurance exercise rapidly pre-conditions heart and skeletal muscles, enhancing cellular protection against various stresses. This adaptation, known as exercise preconditioning, improves muscle resilience and offers potential therapeutic insights.

Keywords:
cardioprotectiondiaphragmendurance exercisemechanical ventilationskeletal muscle

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Area of Science:

  • Exercise physiology and cellular biology
  • Muscle adaptation and stress resistance

Background:

  • Endurance exercise induces significant cellular adaptations in cardiac and skeletal muscles.
  • These adaptations include altered mitochondrial function and protein expression, leading to a protective phenotype termed 'exercise preconditioning'.

Purpose of the Study:

  • To review the development of exercise-induced protection in cardiac myocytes and skeletal muscle fibers.
  • To highlight the underlying mechanisms responsible for this protection in both muscle types.

Main Methods:

  • Literature review of studies investigating exercise-induced preconditioning.
  • Analysis of cellular and molecular adaptations in response to endurance exercise training.

Main Results:

  • As few as 3-5 days of endurance exercise confer a preconditioned cardiac phenotype resistant to ischemia-reperfusion injury.
  • Endurance exercise training also yields skeletal muscle fibers resistant to heat stress, oxidative stress, and inactivity-induced atrophy.

Conclusions:

  • Exercise preconditioning enhances cellular resilience in both cardiac and skeletal muscles.
  • Understanding these mechanisms may inform pharmacological therapies for muscle injury.