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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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The Sarcomere01:08

The Sarcomere

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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each...
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
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Cross-bridge Cycle01:26

Cross-bridge Cycle

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Updated: Feb 25, 2026

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model
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The link between exercise and titin passive stiffness.

Sophie Lalande1, Patrick J Mueller2, Charles S Chung2

  • 1Department of Kinesiology & Health Education, The University of Texas at Austin, Austin, TX, USA.

Experimental Physiology
|August 2, 2017
PubMed
Summary
This summary is machine-generated.

This review explores how cardiac passive stiffness, measured in vivo and at the molecular level, predicts exercise tolerance. Exercise training shows potential to reduce cardiac passive stiffness, offering therapeutic benefits for cardiovascular diseases.

Keywords:
diastolic functionpassive stiffnesstitin

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Exercise Science

Background:

  • Cardiac passive stiffness, a key determinant of diastolic filling, is increasingly recognized for its role in cardiovascular health.
  • The giant elastic protein titin significantly influences passive stiffness through its isoform composition and post-translational modifications.
  • Increased left ventricular passive stiffness is linked to reduced exercise tolerance and impaired diastolic function.

Purpose of the Study:

  • To review the relationship between molecular and in vivo measurements of cardiac passive stiffness.
  • To examine how cardiac passive stiffness affects exercise tolerance.
  • To explore the potential of exercise training as a therapeutic intervention for conditions characterized by increased cardiac passive stiffness.

Main Methods:

  • In vivo measurements of left ventricular passive stiffness (e.g., pressure-volume relationships, echocardiography).
  • Molecular assessments focusing on titin's role in passive stiffness.
  • Analysis of studies investigating the impact of exercise training on cardiac passive stiffness in human and animal models.

Main Results:

  • A strong inverse relationship exists between cardiac passive stiffness and exercise tolerance.
  • Increased left ventricular passive stiffness predicts reduced exercise capacity due to impaired diastolic filling.
  • Exercise training can induce both short- and long-term adaptations in titin-based passive stiffness.

Conclusions:

  • Cardiac passive stiffness is a significant predictor of exercise tolerance.
  • Exercise training may serve as a therapeutic strategy to reduce cardiac passive stiffness and improve cardiovascular health.
  • Targeting titin-based passive stiffness presents a potential novel therapeutic avenue for cardiovascular diseases.