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Related Concept Videos

Overview of Protein Metabolism01:21

Overview of Protein Metabolism

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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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Bone Disorders01:29

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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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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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Metabolic States of the Body: Fasting and Starvation01:24

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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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Proteins: Dietary Sources and Requirements01:28

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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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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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The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
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Nutrition and Sarcopenia.

René Rizzoli1

  • 1Division of Bone Diseases, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland.

Journal of Clinical Densitometry : the Official Journal of the International Society for Clinical Densitometry
|June 11, 2015
PubMed
Summary
This summary is machine-generated.

Sarcopenia risk increases with age. Combining adequate protein and vitamin D intake with regular exercise can help build muscle mass and strength, mitigating this risk.

Keywords:
Dietary intakesfallsmusculoskeletal healthphysical exercisevitamin D

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Area of Science:

  • Gerontology
  • Nutritional Science
  • Exercise Physiology

Background:

  • Sarcopenia, characterized by muscle loss, increases fall and fracture risks in individuals over 50.
  • Healthy lifestyle interventions can attenuate sarcopenia development.

Purpose of the Study:

  • To summarize the role of diet and exercise in mitigating sarcopenia.
  • To provide evidence-based recommendations for protein and vitamin D intake and physical activity.

Main Methods:

  • Literature review on muscle protein synthesis, aging, and lifestyle interventions.
  • Analysis of current recommendations for nutritional and physical activity guidelines.

Main Results:

  • Protein and physical activity are key anabolic stimuli for muscle protein synthesis.
  • Combined protein intake and exercise yield greater muscle accretion than either alone.
  • Optimal intake: 1.0-1.2 g/kg/day protein, 800 IU/day vitamin D, 3-5x/week exercise with proximate protein intake.

Conclusions:

  • Lifestyle modifications, including diet and exercise, are crucial for preventing and managing sarcopenia.
  • Specific recommendations for protein, vitamin D, and exercise timing can optimize muscle health in aging adults.