Related Experiment Video
Updated: Jun 24, 2026
09:50
Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations
Published on: January 25, 2018
[Exercise and cellular adaptation of muscle]
U Tegtbur1, M W Busse, H P Kubis
1Institut für Sportmedizin, Medizinische Hochschule Hannover , Carl-Neuberg-Strasse 1, Hannover, Germany. tegtbur.uwe@mh-hannover.de
Der Unfallchirurg
|March 25, 2009
Summary
Resistance and endurance exercise enhance muscle protein synthesis through various pathways. Training adaptations, including satellite cell integration, optimize muscle function and can be leveraged for interventions in aging populations.
Area of Science:
- Muscle physiology and cellular signaling pathways.
- Molecular mechanisms of exercise adaptation.
- Skeletal muscle plasticity in response to training stimuli.
Context:
- Skeletal muscle adapts to resistance and endurance training through distinct molecular signaling pathways.
- Muscle fiber type expression (e.g., myosin heavy chain isoforms) is modulated by training and immobilization.
- Eccentric resistance training promotes sarcomeric protein assembly, while concentric contractions induce hypertrophy, even in older adults.
Purpose:
- To elucidate the signaling pathways (e.g., mTOR, calcium-calcineurin-NFATc1) mediating muscle adaptation to different training types.
- To investigate the role of satellite cells in muscle repair and growth in response to exercise.
- To understand how training, bed rest, and aging influence cellular signal transduction in skeletal muscle.
Summary:
- Resistance and endurance training stimulate muscle protein synthesis via pathways like mTOR and calcium-calcineurin-NFATc1.
- Training influences muscle fiber type expression and promotes hypertrophy through concentric contractions.
- Satellite cell activation and integration into muscle fibers contribute to enhanced protein synthesis and muscle adaptation.
Impact:
- Provides insights into optimizing training regimens for muscle adaptation and hypertrophy.
- Informs the development of interventions to counteract age-related muscle decline.
- Enhances understanding of cellular mechanisms underlying muscle plasticity for improved health outcomes.
Related Concept Videos
01:26Cellular 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...
01:27Exercise 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...
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...
01:23Cellular Adaptation I: Introduction and Atrophy
Cells can adapt to environmental changes to maintain function and avoid injury, a process called cellular adaptation. Adapted cells exist in a reversible intermediate state with changes in size, number, phenotype, metabolism, or function. These responses help cells meet altered physiological or pathological demands; for example, enlargement of breast and uterine tissues during pregnancy. Early adaptations may enhance function, but persistent stress eventually causes tissue damage.Types of...
01:20Exercise and Cardiovascular Response
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
02:36Cells Coordinate Growth and Proliferation
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
01:13Microscopic Anatomy of Skeletal Muscles
Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...