Janet Belsky’s Experiencing the Lifespan, 3e

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Presentation transcript:

Janet Belsky’s Experiencing the Lifespan, 3e Chapter 8: Physical Development Meredyth Fellows, West Chester University of PA

Puberty Puberty: the hormonal and physical changes that contribute to sexual maturity and adult height Takes an average of five years and today is typically an early teenage change Secular trend Puberty Rite − “coming of age” Menarche and Spermarche

Puberty Trends The Secular Trend A century-long decline in the average age at which children reach puberty in the developed world (signaled by menarche)

The Hormonal Programmers Two Systems: Adrenal androgens − produced by adrenal glands Program aspects of puberty Promote growth of hair; influence skin changes; program sexual desire. Androgens begin secretion in middle childhood. HPG Axis (Hypothalamic, Pituitary, Gonad) Main hormonal system programming puberty Hypothalamus triggers the pituitary to secrete its hormones, which, in turn, trigger the gonads to secrete their hormones, which produce major body changes.

The Hormonal Programmers Gonads (sex organs) Testes Ovaries Adrenal androgens (testes and estrogen) found in both sexes Program sexual desire and skin and bodily hair growth

Physical Changes Primary Sexual Characteristics Changes that directly involve the organs of reproduction Growth of uterus, maturation of the ovaries, onset of menarche Growth of penis, testes, onset of spermarche Secondary Sexual Characteristics Physical changes not directly involved in reproduction Hair growth, voice changes, acne, breast development Growth Spurt Dramatic increase in weight and height

Puberty Timetables: Individual Differences Influences Genetics Weight Nutrition Stress Sequence of some major events of puberty

Predicting Girls’ Chances of Early Puberty

Feelings about Puberty Basic principle: Changes are exciting and frightening; reactions depend on social norms and reactions of individual family members. Breast development Western Cultures = pride Exception: girls who attempt to maintain pre-pubescent appearance (gymnastics, etc.) Menstruation—girls have varying responses Spermarche—young men tend to be secretive

Maturing Early: Possible Problems for Girls Special risk of developing acting-out behaviors Gravitate to older friends Unprotected sex Possible disconnect from school (poor grades) Risk of becoming anxious/depressed Body dissatisfaction Self-consciousness

Wrapping Up Puberty Environmental context will affect child’s reaction to puberty. Especially for boys, communication can be improved. With early-maturing girls, take care to arrange the best body−environment fit.

Interventions: Minimizing Distress during Puberty For society—school environment important Earlier introduction to sex education Provide nurturing environment to set adolescents on right path. For parents Be alert for “acting-out” behaviors in young teenage girls. Communication important Make an effort to communicate about pubertal changes with same-sex child.

Body Image Issues Susan Harter’s research Feelings of competence in five domains relates to overall self-esteem. Scholastic competence, behavioral conduct, athletic skills, peer likeability, appearance For adolescents, contentment with one’s appearance outweighs any other category.

Thin Ideal: the desire to be “smaller” among average and underweight Irish girls (12–19)

Differing Body Concerns of Girls and Boys Peer pressure Teasing Dating Media Presents unrealistic images (digitally altered) Strong influence in promoting body dissatisfaction in both genders

Queen Latifa embodies the fact that bodies are beautiful at every size. Not only is she a role model for women of color, but for every woman in our culture.

Eating Disorders Anorexia Nervosa Affects 1 in 1,000 teenagers (majority girls) Self-starvation to being 85% or less of healthy body weight Starvation can destroy body organs and cause death. Medical emergencies require hospitalization (2/3 of ideal weight or less). Menstruation ceases Distorted body image

Bulimia Nervosa Characterized by at least biweekly cycles of binging and purging In addition to forced vomiting, purging may include taking laxatives and/or diuretics, fasting, and excess exercise. Major consequences Mouth sores, loss of tooth enamel (gray teeth), esophageal ulcers, esophageal cancer Prevalence is increasing

Risk Factors Strong hereditary component, especially in girls Temperamental tendency to be anxious, to have low self-efficacy, to have a great need for approval, and an inability to express legitimate needs.

Interventions Target at-risk girls prone to: Focus on: Depression and low self-worth Subscribe to the “thin” ideal Focus on: Elevating self-efficacy Promoting true self-esteem Demanding genuine effort Encouraging autonomy (“It’s your choice.”)

Exploring Sexual Desire First sexual feelings programmed by adrenal androgens. About age 10 An interplay of nature/nurture heightens sex hormone levels Nature (androgens) Nurture How we and others react to our body changes

With whom are teens having intercourse? 75% girls and 56% boys report first sex with steady partner 1 in 5 teens have sex outside of a committed relationship Research with Ohio teenagers engaging in non-committed sex: For girls, having noncommitted sex with a number of partners is a risk factor for depression. For boys, having sex with a number of partners promoted higher self-esteem (one study).

Sexual Double-Standard Cultural code that gives men greater sexual freedom than women Research shows that both boys and girls put their highest priority on intimacy.

Sexuality: Contemporary Trends