KINESIOL 4SS3 Lecture Notes - Lecture 7: Myocyte, Vastus Lateralis Muscle, Muscle Atrophy
12 Apr 2016
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Document Summary
Aging is associated with a signiicant decrease in muscle mass (sarcopenia) which contributes to the decline in muscle strength. Many factors are thought to contribute to sarcopenia. Many things contribute that we don"t have any control over (i. e. hormones, gender, sedentary lifestyle, smoking, geneics, age, height) Age-associated decrease in muscle mass accompanied by a decrease in muscle strength. Beter maintenance: muscles used in daily living, eccentric muscle strength, slow velocity contracions. Greater decline: muscles used infrequently, concentric or isometric strength, high velocity contracions. % of max when they were young, shows that there is no decline in ecc for pf and df while in kf there is a decline in both ecc and con however more in con. Eccentric: posiive breaking force, resistance to stress, more addiive force from elasic elements. The higher the velocity demands, the lower the relaive tension that the aged muscle can generate. Maximum rate of force development slower in older adults.
