PSY 384 Lecture Notes - Lecture 3: Hayflick Limit, Senescence, Genetic Programming
11 Mar 2018
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Metabolic theories: assume that people are born with a limited amount of energy to be expended in a lifetime. Metabolic rates: slower metabolic rates in animals are correlated with longer life spans. Caloric intake: decreased caloric intake is associated with lower risk of premature death, slower normative age-related changes, and longer life spans. Benefits are limited by when feeding occurs, quantities, and what is eaten. Extreme limits on caloric intake raise quality-of-life questions. Cellular theories: point to causes of aging at the cellular level. Hayflick limit: suggests that there might be limits on how often cells divide before dying. Telomeres: the tips of chromosomes become shorter with each replication and eventually become unable to replicate. Chronic stress may accelerate the changes that occur in. Moderate exercise may maintain telomere length or slow the telomeres rate of shortening. Cross-linking: results from proteins interacting and randomly producing molecules that make the body more stiff.
