Related Experiment Video

Updated: Aug 12, 2026

A Rapid Automated Protocol for Muscle Fiber Population Analysis in Rat Muscle Cross Sections Using Myosin Heavy Chain Immunohistochemistry
05:57

A Rapid Automated Protocol for Muscle Fiber Population Analysis in Rat Muscle Cross Sections Using Myosin Heavy Chain Immunohistochemistry

Published on: March 28, 2017

Changes in fiber type composition in growing muscle as a result of dynamic exercise and static overload

P W Watt, G Goldspink, P S Ward

    Muscle & Nerve
    |January 1, 1984
    PubMed

    More Related Videos

    Fiber Type Identification of Human Skeletal Muscle07:04

    Fiber Type Identification of Human Skeletal Muscle

    Published on: September 22, 2023

    Single Fiber Isolation Assay for the Assessment of Oxidative Myofiber Behavior07:01

    Single Fiber Isolation Assay for the Assessment of Oxidative Myofiber Behavior

    Published on: March 31, 2026

    Related Concept Videos

    Classification of Skeletal Muscle Fibers01:48

    Classification of Skeletal Muscle Fibers

    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...
    Formation of Muscle Fibers from Myoblasts01:13

    Formation of Muscle Fibers from Myoblasts

    De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
    Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
    Isotonic and Isometric Muscle Contractions01:22

    Isotonic and Isometric Muscle Contractions

    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 the...
    Types of Skeletal Muscle Fibers01:32

    Types of Skeletal Muscle Fibers

    Skeletal muscles comprise various fibers, each with distinct characteristics and roles in movement and stability. They are mainly categorized into three types — fast-twitch, slow-twitch, and intermediate.
    Fast-twitch fibers
    Fast-twitch fibers, or Type II fibers, are designed for quick, powerful bursts of speed and strength. They reach peak tension within approximately 0.01 seconds following stimulation. Characterized by a large diameter and densely packed myofibrils, these fibers contain...
    Exercise and Muscle Performance01:27

    Exercise and Muscle Performance

    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...
    Cellular Adaptation II: Hypertrophy01:26

    Cellular Adaptation II: Hypertrophy

    Hypertrophy is the increase in the size of individual cells, resulting in the enlargement of a tissue or organ. Unlike hyperplasia, which involves an increase in cell number, hypertrophy is characterized by an increase in cell volume. This process often occurs in response to higher functional demand or hormonal stimulation, leading to the production of more structural proteins and organelles, thereby enhancing the cells' work capacity.There are two primary types of hypertrophy: physiological...