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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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Muscles of the Eye01:20

Muscles of the Eye

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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and...
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Muscles that Move the Head01:19

Muscles that Move the Head

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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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Muscles of the Abdomen01:21

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The abdominal wall encircles the abdominal cavity, providing flexible protection and shielding the internal organs from harm. It is bordered at the top by the xiphoid process and costal margins, at the back by the vertebral column, and at the bottom by the pelvic bones and inguinal ligament. The abdominal wall is divided into two regions — the anterolateral and posterior regions.
Anterolateral Region
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Muscles that Move the Arm01:31

Muscles that Move the Arm

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Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...
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Muscles that Move the Forearm01:16

Muscles that Move the Forearm

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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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Updated: Feb 2, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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An Analytical Approach to Posture-Dependent Muscle Force and Muscle Activation Patterns.

Ali Marjaninejad, Jasmine A Berry, Francisco J Valero-Cuevas

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |November 17, 2018
    PubMed
    Summary

    Personalized training plans can improve athletic performance. This study introduces a new analytical method to understand how individual anatomy affects muscle forces and activation, enabling tailored exercise programs.

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    Area of Science:

    • Biomechanics and Kinesiology
    • Sports Science and Performance Optimization
    • Computational Modeling in Human Movement

    Background:

    • Personalized training is a key research area for enhancing athletic performance.
    • Understanding individual anatomical variations is crucial for optimizing training.
    • Current methods may lack efficiency in providing personalized biomechanical insights.

    Purpose of the Study:

    • To introduce an analytical method for studying posture-dependent muscle force patterns.
    • To evaluate the utility of person-specific training using biomechanical modeling.
    • To provide model-based approximations of muscle activation and force without subject recordings.

    Main Methods:

    • Developed an analytical method to assess changes in muscle forces relative to posture.
    • Analyzed posture-dependent variations in maximal muscle force and activation due to moment arm changes.
    • Applied the method to a squat movement to analyze muscle force and activation sensitivities.

    Main Results:

    • Maximal muscle force and activation values exhibit variable sensitivity to moment arm changes across different postures and muscles.
    • The analytical method provides fast and efficient model-based approximations for muscle behavior.
    • Individualized training plans show potential for performance improvement in specific movements.

    Conclusions:

    • The proposed analytical method effectively models posture-dependent muscle force and activation.
    • Results suggest that personalized training strategies can be beneficial for athletes.
    • This approach offers a pathway to better understand individual muscle contributions during movement.