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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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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.
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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
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Consuming animal-based products offers high-quality proteins that contain optimal levels and combinations of essential amino acids, crucial for tissue repair and growth. Foods like eggs, milk, fish, and most meats are a source of complete proteins. Legumes and cereals are abundant in proteins; however, they typically lack a full range of essential amino acids. As a result, they are considered incomplete protein sources. Some plant sources like soybeans, quinoa, and amaranth do contain complete...
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Contribution of Protein Intake and Concurrent Exercise to Skeletal Muscle Quality with Aging.

N D Dicks1, C J Kotarsky, K A Trautman

  • 1Nathan D. Dicks, Concordia College, Department of Nutrition, Dietetics and Exercise Science, 901 8th St. S., Moorhead, MN 56562; 218-299-4440

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Concurrent exercise and protein intake improve skeletal muscle quality. These factors, along with light physical activity, are key to maintaining muscle health and combating age-related decline.

Keywords:
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Area of Science:

  • Muscle physiology and aging research.
  • Biomedical imaging and quantitative analysis.

Background:

  • Skeletal muscle quality assessment using MRI-derived functional cross-sectional area (FCSA) and intramuscular adipose tissue (IMAT) is crucial for understanding aging and inactivity.
  • Defining muscle quality is fundamental for research into age-related muscle mass loss.

Purpose of the Study:

  • To investigate factors influencing lower-extremity skeletal muscle quality in healthy adults across younger and middle-aged groups.
  • To identify associations between lifestyle factors and muscle quality metrics.

Main Methods:

  • Cross-sectional study involving 98 healthy adults (20-65 years), categorized by age and exercise status (sedentary vs. active).
  • Magnetic resonance imaging (MRI) of lower limbs to measure muscle cross-sectional area (CSA), FCSA, and IMAT.
  • Accelerometry for physical activity monitoring and food diaries for dietary intake assessment.

Main Results:

  • Higher knee extensor IMAT was observed in sedentary and middle-aged individuals compared to active and younger adults, respectively.
  • Active individuals and those with higher protein intake showed better muscle quality metrics.
  • Concurrent exercise training, protein intake, and light physical activity significantly predicted knee extensor FCSA and IMAT.

Conclusions:

  • Concurrent exercise training, adequate dietary protein intake, and light physical activity are significant determinants of skeletal muscle health.
  • These lifestyle factors play a vital role in mitigating age- and inactivity-related decline in muscle quality.
  • Further research is warranted to optimize interventions targeting muscle quality maintenance.