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Related Concept Videos

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...
Axial and Appendicular Muscles01:18

Axial and Appendicular Muscles

Skeletal muscles, the key players in our body's movement, can be classified into two groups based on their location and function: axial muscles and appendicular muscles. These classifications reflect the primary roles the muscles play in the body's structure and movement.
Axial Muscles
Axial muscles, situated along the body's midline, are intricately connected to the axial skeleton, which includes the skull, spine, ribs, and sternum. These muscles facilitate facial expressions and play a...
Muscles of the Thorax01:25

Muscles of the Thorax

The thorax muscles are central to the body's respiration and provide essential support and movement for the upper body. They are intricately designed to facilitate the complex breathing process while also contributing to the structural integrity and mobility of the chest and upper limbs.
The diaphragm is at the core of thoracic musculature, the primary muscle involved in breathing. This expansive, dome-shaped muscle marks the division between the thoracic and abdominal cavities. It originates...
Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
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...

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Updated: Jun 19, 2026

Skeletal Muscle Gender Dimorphism from Proteomics
09:29

Skeletal Muscle Gender Dimorphism from Proteomics

Published on: December 14, 2011

Muscle morphology and jump performance: gender and intermuscular variability.

L M Alegre1, A J Lara, J L L Elvira

  • 1Faculty of Sports Sciences, University of Castilla-La Mancha, Avda. Carlos III s/n. 45071, Toledo, Spain. luis.alegre@uclm.es

The Journal of Sports Medicine and Physical Fitness
|October 29, 2009
PubMed
Summary

Men exhibit superior jump performance compared to women, linked to differences in leg extensor muscle architecture, particularly vastus lateralis muscle size.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Sports Science

Background:

  • Understanding gender-based performance disparities in physical activities like jumping is crucial.
  • Muscle architecture significantly influences force production and athletic capabilities.

Purpose of the Study:

  • To investigate gender differences in jump performance and leg muscle architecture.
  • To ascertain if muscle architecture variations explain gender-based jump performance gaps.

Main Methods:

  • Sixty-two participants (34 women, 28 men) across various physical activity levels.
  • Countermovement jumps (CMJ) assessed for performance.
  • Ultrasonography used to analyze vastus lateralis (VL), gastrocnemius medialis (GM), and gastrocnemius lateralis (GL) muscle architecture at rest.

Main Results:

  • Men demonstrated significantly higher CMJ height than women (0.388m vs 0.279m).
  • Significant gender differences observed in VL muscle thickness and relative fascicle length across VL, GM, and GL muscles.
  • VL muscle size showed significant associations with jump performance (r=0.49-0.50).

Conclusions:

  • Confirmed gender differences in leg muscle architecture across diverse physical activity backgrounds.
  • Gender disparities in VL muscle size partially accounted for observed differences in jump performance.