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Disorders of the Skeletal Muscle

Disorders of the Skeletal Muscle

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...

Skeletal Muscle Anatomy

Skeletal Muscle Anatomy

Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.

Bone Disorders

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...

Overview of Skeletal Muscle

Overview of Skeletal Muscle

Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...

Alterations in Muscle Tone lll

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...

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3D Ultrasound Imaging: Fast and Cost-effective Morphometry of Musculoskeletal Tissue

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[Skeletal muscle mass in institutionalized elderly].

Mona Boaz, Julio Wainstein

|June 17, 2010

Summary

Frailty and sarcopenia (age-related muscle loss) increase with longevity. Identifying modifiable risk factors for sarcopenia in the elderly is crucial for developing interventions to improve health outcomes.

Area of Science:

Gerontology
Muscle Physiology
Public Health

Background:

Increased longevity is leading to a higher proportion of elderly individuals.
Frailty in the elderly is often linked to sarcopenia, characterized by loss of skeletal muscle mass and function.
Sarcopenia results from an imbalance between muscle protein synthesis and degradation.

Discussion:

Sarcopenia prevalence is high in community-dwelling seniors (17.5% in very elderly males) and even higher in disabled nursing home residents.
Prevalence differs between genders, potentially due to varying comorbidity rates.
Identifying modifiable risk factors for sarcopenia offers opportunities for targeted interventions.

Key Insights:

Frailty and sarcopenia are significant concerns in aging populations.

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Nutrition, exercise, and managing comorbidities are key to maintaining muscle mass.

Sarcopenia rates are higher in institutionalized and male elderly populations.

Outlook:

Further research is essential to explore interventions for sarcopenia in frail elderly individuals.
Investigating the impact of improved skeletal muscle mass on survival in nursing home residents is a critical next step.
Understanding gender-specific differences in sarcopenia may refine prevention and treatment strategies.