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Lean…. Mean….

Lean…. Mean…. MUSCLE!!!. Presentation 3. By: Maria Canino & Mallery Boczek. Importance of Muscle. 1. Movement of Body Parts Responsible for all voluntary movements of body parts Contraction (shortening) causes movement 2. Stability and Posture

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Lean…. Mean….

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  1. Lean…. Mean…. MUSCLE!!! Presentation 3 By: Maria Canino&MalleryBoczek

  2. Importance of Muscle 1. Movement of Body Parts • Responsible for all voluntary movements of body parts • Contraction (shortening) causes movement 2. Stability and Posture • Stabilize the human skeleton and provide proper posture • Also help with joint stabilization and strengthening 3. Heat Production • A high metabolic rate will produce greater amounts of body heat as a byproduct of contraction • Essential in cold climates

  3. Importance (cont.) 4. Circulation • Cardiac muscles force circulation of blood throughout the body • Regular pumping keeps the body in motion and allows nutrients to be readily available for all tissues 5. Digestion • Smooth muscles of the stomach and intestines assist the digestive system in the process of digestion of food

  4. Impact of Age/Maturation • Strength and muscle mass peak in 20’s • Rate of the progressive decline in muscle physiology will vary from person to person • It will depend on the following: diversity of occupations, physical activity backgrounds, the muscles used, and the type of contractions • When muscle atrophy, an increase in fat is seen • Muscle atrophy is most noticeably seen around 50 years in both men and women • A significant loss in fast twitch fibers

  5. By age 80, most individuals only have half as much strength and endurance • A large percentage of 70 year olds cannot lift 10 lb weights • Major factor in falls, fractures, etc. • Functional movement through the muscular system becomes difficult in the elderly • Typical daily living activities are hindered such as climbing stairs, rising from a squatting position, walking a straight line, standing on one leg or hopping, etc. • Between ages 30-75, overall lean body mass decreases due to reduced skeletal muscle mass. • Sarcopenia- progressive decrease in number and size of muscle fibers • Elasticity of skeletal muscles become less • Fibrosis- increasing the amounts of fibrous connective tissue which in turn makes muscles less flexible, less movement occurring, and restrictive circulation

  6. In short… According to jointessential.com: • Decrease in the total amount of muscle fibers due to depressed productive capacity of cells to produce proteins. • Decrease in the size of muscles cells, fibers and tissue (also known as generalized muscular atrophy). • Total loss of muscle bulk, power and strength of all major muscle groups like deltoids, biceps, triceps, hamstrings, gastrocnemius etc. • Wasting or wear and tear of the protective cartilage of joints that normally acts as a shock-absorber and gliding agent that prevents the bone from frictional injuries. • Stiffening and fibrosis of connective tissue elements that decreases the range of motion and makes movements less efficient.

  7. So let’s look forward to getting old!!!

  8. References • http://www.mananatomy.com/body-systems/muscular-system • Taft College, Muscle Tissue pdf • http://www.austincc.edu/sziser/Biol%202404/2404LecNotes/2404LNExII/Muscle%20Aging%20and%20Disease.pdf • American College of Sports Medicine article by Michael G. Bemben, Ph.D., FACSM • http://www.aahf.info/sec_exercise/section/muscular.htm • http://www.jointessential.com/what-are-the-effects-of-aging-on-the-musculoskeletal-system/.

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