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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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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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Muscle Coordination and Action01:24

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Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
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Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....
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Muscles that Move the Forearm01:16

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The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
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Muscles that Move the Head01:19

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The muscles that move the head are a dynamic and complex group of structures that work together to facilitate a wide range of head movements, including rotation, flexion, extension, and lateral bending.
The bilateral sternocleidomastoid, or SCM, and the suprahyoid and infrahyoid muscles are significant head flexors. The SCM muscles originate at the sternum and clavicle and attach to the mastoid process of the temporal bone. The SCM contracts bilaterally to bend the head forward, whereas...
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Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise
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Muscle over mind.

Hyo Youl Moon1, Henriette van Praag1

  • 1Neuroplasticity and Behavior Unit, Laboratory of Neurosciences, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA.

Cell Metabolism
|October 9, 2014
PubMed
Summary
This summary is machine-generated.

Exercise may combat depression by boosting muscle PGC-1α1, which reduces harmful kynurenine levels. This mechanism prevents kynurenine from entering the brain, potentially improving neural plasticity and alleviating depressive symptoms.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Molecular Biology

Background:

  • Depression is linked to increased kynurenine levels, a tryptophan metabolite produced during stress and inflammation.
  • The kynurenine pathway plays a role in neurological and psychiatric disorders.

Purpose of the Study:

  • To investigate the role of PGC-1α1 in mediating the antidepressant effects of exercise.
  • To explore the link between muscle metabolism and brain function in the context of depression.

Main Methods:

  • Overexpression of PGC-1α1 in muscle tissue.
  • Assay of kynurenine aminotransferase (KAT) expression.
  • Analysis of kynurenine levels and its potential to cross the blood-brain barrier.

Main Results:

  • PGC-1α1 overexpression in muscle increased KAT expression.
  • This increase in KAT likely reduces circulating kynurenine levels.
  • Preventing kynurenine from crossing the blood-brain barrier may mitigate its negative effects on neural plasticity.

Conclusions:

  • Muscle PGC-1α1 activation, similar to exercise, can modulate the kynurenine pathway.
  • This pathway represents a potential therapeutic target for depression.
  • Targeting muscle metabolism could offer novel strategies for treating depression.