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Related Concept Videos

Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Related Experiment Video

Updated: Mar 18, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
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The Muscular Overuse Syndrome in Long-Distance Runners.

R H Dressendorfer, C E Wade

    The Physician and Sportsmedicine
    |July 12, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Overtraining in male runners led to muscle injury indicators like thigh soreness and elevated creatine kinase (CK) levels. Reduced thigh circumference suggested muscle atrophy from unaccustomed high mileage during the 20-day race.

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    Area of Science:

    • Sports Medicine
    • Exercise Physiology
    • Biochemistry

    Background:

    • Overtraining syndrome is a concern for endurance athletes.
    • Muscle injury markers are crucial for monitoring training load.
    • Understanding the physiological impact of extreme running mileage is important.

    Purpose of the Study:

    • To investigate indicators of muscular injury in male runners undertaking high-volume road racing.
    • To assess the impact of doubling daily mileage on muscle damage and atrophy.
    • To evaluate the recovery response of muscle injury markers after cessation of intense training.

    Main Methods:

    • 12 male runners participated in a 20-day road race.
    • Average daily mileage was 17.3 miles, double their usual training distance.
    • Serum creatine kinase (CK) levels and thigh circumference were measured.

    Main Results:

    • Runners reported mild-to-moderate thigh muscle soreness.
    • Serum CK levels increased on mornings following running sessions.
    • CK levels normalized after a two-day rest period post-day 10.
    • Thigh circumference significantly decreased, indicating muscle atrophy.

    Conclusions:

    • Intensified running mileage during the race induced muscle injury and soreness.
    • Serum CK is a sensitive indicator of muscle damage from overtraining.
    • Prolonged high-volume running can lead to thigh muscle atrophy.
    • Rest is effective in normalizing muscle injury markers after overexertion.