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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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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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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.
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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Eccentric Muscle Contractions: Risks and Benefits.

Stéphanie Hody1, Jean-Louis Croisier1, Thierry Bury1

  • 1Department of Motricity Sciences, University of Liège, Liege, Belgium.

Frontiers in Physiology
|May 28, 2019
PubMed
Summary
This summary is machine-generated.

Eccentric contractions, or muscle lengthening, can cause soreness (DOMS). Repeated sessions with gradually increasing intensity are key to preventing this, but more research is needed on underlying cellular mechanisms.

Keywords:
delayed-onset muscle soreness (DOMS)eccentric contractioneccentric muscle trainingexercise-induced muscle damage (EIMD)skeletal muscle

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Area of Science:

  • Exercise Physiology
  • Muscle Biology
  • Rehabilitation Science

Background:

  • Eccentric contractions involve muscle lengthening and possess unique physiological properties.
  • These contractions are increasingly utilized in rehabilitation and clinical settings.
  • Unaccustomed eccentric exercise frequently leads to muscle damage and Delayed-Onset Muscular Soreness (DOMS).

Purpose of the Study:

  • To explore the cellular and molecular mechanisms behind initial muscle damage from eccentric exercise.
  • To understand the adaptations that occur following eccentric exercise.
  • To identify potential therapeutic targets for muscle damage and soreness.

Main Methods:

  • The study reviews existing literature on eccentric contractions and their effects.
  • It focuses on the cellular and molecular responses to unaccustomed eccentric exercise.
  • Analysis of current preventive strategies and their efficacy.

Main Results:

  • Eccentric exercise causes muscle damage and DOMS, with repeated submaximal sessions being a preventive strategy.
  • A significant knowledge gap exists regarding the molecular mechanisms of damage and adaptation.
  • Understanding these mechanisms could inform treatments for myalgia and neuromuscular diseases.

Conclusions:

  • Further research into the molecular underpinnings of eccentric exercise is crucial.
  • This knowledge can guide the development of effective therapeutic interventions.
  • Insights may also illuminate pathological conditions involving muscle damage and pain.