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Related Concept Videos

Connective Tissue Cell Types01:22

Connective Tissue Cell Types

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Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
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Collagens are the Major Structural Proteins of ECM01:13

Collagens are the Major Structural Proteins of ECM

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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
Connective tissue proper includes loose...
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Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to...
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Fibril-associated Collagen01:11

Fibril-associated Collagen

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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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Dense Connective Tissue01:13

Dense Connective Tissue

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Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
Dense Regular Connective Tissue
In dense regular connective tissue, fibers are arranged parallel to each other, enhancing its tensile strength and resistance to stretching in the direction of the fiber orientations. Ligaments and tendons are made of dense regular...
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Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Related Experiment Video

Updated: Mar 29, 2026

A Novel Tenorrhaphy Suture Technique with Tissue Engineered Collagen Graft to Repair Large Tendon Defects
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A Novel Tenorrhaphy Suture Technique with Tissue Engineered Collagen Graft to Repair Large Tendon Defects

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Collagen Supplementation on Tendon-Related Structural and Performance Outcomes: A Systematic Review.

Albert Buchalski1, Michael Jeanfavre1, Colby Altorelli1

  • 1Stanford Health Care and Outpatient Orthopedic, Sports Medicine Rehabilitation Department, Redwood City, CA 94063, USA.

Journal of Functional Morphology and Kinesiology
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

Collagen supplementation, particularly at higher doses (15-30g) combined with vitamin C and resistance training, may enhance tendon remodeling and increase tendon cross-sectional area and stiffness. However, it does not appear to improve muscle strength.

Keywords:
connective tissue remodelinghydrolyzed collagenmusculoskeletal adaptationrate of force developmentresistance trainingtendon stiffness

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Area of Science:

  • Sports Medicine
  • Nutritional Science
  • Biomechanical Engineering

Background:

  • Tendons adapt to mechanical loading through structural remodeling, crucial for rehabilitation and performance.
  • Collagen supplementation is proposed to aid tendon synthesis, but research yields inconsistent results.
  • Understanding collagen's role in tendon adaptation is vital for optimizing athletic and clinical outcomes.

Purpose of the Study:

  • To systematically review randomized controlled trials on collagen supplementation's effects on human tendon adaptation.
  • To evaluate the impact of collagen on tendon cross-sectional area, stiffness, and muscle performance metrics.
  • To synthesize evidence regarding optimal collagen dosage and co-interventions for tendon remodeling.

Main Methods:

  • Systematic review of RCTs from major databases (PubMed, EMBASE, CINAHL, Web of Science) through May 2025.
  • Risk of bias assessed using the PEDro scale; studies with scores ≥6/10 deemed high quality.
  • Narrative synthesis due to heterogeneity in protocols, training, and outcome measures; data extracted on collagen type, dose, training, duration, and outcomes.

Main Results:

  • Eight RCTs (n=257) met inclusion criteria, all involving resistance or plyometric training (3-15 weeks).
  • Higher collagen doses (15-30 g/day) significantly increased tendon cross-sectional area and stiffness compared to placebo.
  • No additive effects of collagen on muscle strength were observed; conflicting evidence exists for muscle cross-sectional area and performance.

Conclusions:

  • Collagen supplementation (15-30 g) with vitamin C (≥50 mg) may enhance tendon remodeling when combined with high-intensity resistance training (≥70% 1 RM).
  • Strong evidence supports collagen's positive effect on tendon CSA and stiffness (GRADE A).
  • Strong evidence (GRADE A) indicates no effect on muscle strength, with conflicting evidence (GRADE C) for muscle CSA and performance.