Units 19–20 Early & Middle Adulthood

Exam & Course Logistics

Final exam = $100$ MCQs.
- About $\tfrac14$ (≈ $25$ questions) come exclusively from Units $19$ & $20$ (early and middle adulthood).
- All other units appear in a comprehensive manner (≥ $1$ – $10$ questions each).
- One week before finals: instructor posts an Exam Blueprint + Clarification Box.
Instructor-published study tables for Units $19$ – $20$ = high-yield review source.

Early Adulthood (Unit 19)

Age Range & Central Theme

Rough guideline: late teens/early $20$ s through late $30$ s (varies by source).
Hallmarks: establishing adult social roles, peak physical capacity, Olympic-level athletic potential.

Core Developmental Milestones

Transition out of adolescence: high-school/college graduation, leaving parental home, first full-time job.
Erikson: Intimacy vs Isolation
- Intimacy = ability to form committed, mutually supportive relationships (marriage, parenting, deep friendships, even pet bonds).
- Isolation = failure to develop close ties; can manifest as loneliness, resentment, or toxic subcultures (e.g., “incel” forums).
Piaget: formal operations already attained in adolescence; adults now refine & extend higher-order thinking.
Kohlberg: potential entry into post-conventional morality—autonomous ethical reasoning, willingness to break unjust rules for the greater good.

Psychosocial Tasks

Choosing & stabilising a career.
Establishing independent residence & possibly a family.
Expanding social circles beyond family of origin.
"Adulting": decision-making guided by personal values & accountability.
High load of new stressors (job, school, finances, relationships).

Sexual & Reproductive Development

Full reproductive capability; highest lifetime STI risk—necessitates barrier protection & candid communication.
Intimacy ≠ mere sexuality: emphasises honesty, emotional closeness, commitment → security.
Post-partum depression can affect both mothers and fathers.

Key Physiological Changes & Peak Values

Height stable (adult stature achieved); weight may rise if adolescent caloric intake persists.
Basal Metabolic Rate (BMR) starts to decline after $18$ → need caloric adjustment.
Cardiovascular: maximal performance, but vessel elasticity already beginning subtle decline → slight BP creep.
Respiratory: peak vital capacity; smoking or inactivity reduces reserve.
- Vital Capacity = max inhale − max exhale volume.
- Tidal Volume = air exchanged in a normal breath.
Musculoskeletal: maximal strength, endurance, reaction time (peaks early $20$ s → gradual drop afterwards).
Dentition: eruption/removal of wisdom teeth; gingivitis = #1 preventable cause of later tooth loss.
BMI
- Formula $\displaystyle \text{BMI}=\frac{\text{kg}}{\text{m}^2}$ .
- Normal $18.5!–!25$ ; $25!–!29$ overweight; >29 obese (note: muscular builds inflate BMI).
Sensory
- Hearing best at $\approx20$ ; high-frequency loss begins immediately after.
- Visual acuity decline starts $\approx25$ .

Nutrition Essentials

Restaurant portions > physiologic need—aim for palm-sized protein & fist-sized carb/veg.
Water = healthiest beverage; reserve sugary or artificially sweetened drinks for rare use.
Soft drinks (sugar or non-nutritive sweeteners) ↑ cardiovascular risk.
Prediabetes: $\tfrac13$ U.S. adults affected; $9/10$ unaware.
Acceptable daily eggs ≤ $2$ ; LDL chiefly driven by saturated/trans fats.
Fats spectrum
- “Good” → avocados, olive oil, fatty fish, nuts/seeds.
- “Bad” → butter, cheese, tropical oils.
- “Ugly” → fried foods, stick margarine, partially-hydrogenated oils.

Exercise, Weight, Sleep & Leisure

“Fountain of youth” = sweat gland: exercise $3$ – $5$ ×/wk moderate-vigorous.
Weight-loss maintenance traits: no crash dieting, meticulous self-monitoring (food, activity, weekly weight), environmental cues (healthy food visible, junk scarce).
Sleep target $7$ – $9$ h nightly.
- Sleep deprivation ⇒ ↑ anxiety, stroke & heart-disease risk, insulin resistance, depression.
Leisure/hobby (nature walks, “hot-girl” walks) lowers stress, heart rate, improves mood.
Sedentary danger: ≥ $7$ h sitting/day or > $30$ min uninterrupted sitting = metabolic & cancer risk; use timers/fitness trackers to prompt movement.

Safety & Mental Health

Model non-smoking/vaping, seat-belt use, contraceptive/family-planning literacy.
Stress triggers: work, finances, marriage, child issues.
- Coping toolbox: humor, addressing root causes, saying no, time management, exercise, mindfulness.
Self-regulation & goal setting = key predictors of academic/work persistence.

Middle Adulthood (Unit 20)

Age Range & Central Theme

Rough span: $40$ – $65$ yrs.
Erikson: Generativity vs Stagnation
- Generativity: investing in next generation—parenting, mentoring, community service.
- Stagnation: self-absorption, lack of productivity, “mid-life ennui.”

Cognitive, Moral & Spiritual Growth

Peak intellectual efficiency: objective, logical, realistic thought; motivated lifelong learning (career courses, hobbies).
Kohlberg post-conventional morality continues: doing “what’s right” even if unpopular.
Greater reflection on values; spirituality often gains salience.

Changing Social Roles

"Empty-nest" couples re-negotiate relationship; potential resurgence of hobbies/travel.
Sandwich Generation: simultaneously support children (or boomerang adult kids) and aging parents.
- Challenges: time-conflict, financial strain, caregiver burnout.
- Coping: prioritize, delegate to siblings, utilise community resources, self-care first (Maslow).
Possible spike in marital conflict/divorce if earlier issues unresolved.

Career & Economic Tasks

Usually peak earning power; focus on retirement planning & financial security.
Some pursue mid-life career changes (health limits, tech shifts, personal fulfilment).
May juggle multiple jobs to offset rising costs.

Physical & Hormonal Changes

External: graying/thinning hair, subcutaneous fat redistribution (↑ waist/hips), nail ridging.
Weight gain pattern: men plateau around $55$ , women continue until $65$ unless lifestyle modified.
Cardiopulmonary: endurance declines if inactive; rib-cage stiff → ↓ gas exchange → ↑ breathlessness on exertion.
Musculoskeletal: joint cartilage thins → osteoarthritis; connective tissue stiffens; flexibility loss.
Sensory
- Lens thickens → presbyopia, cataracts risk.
- Annual eye checks for glaucoma & cataract detection.
- Presbycusis (high-pitch loss) progressive; industrial noise accelerates.
Taste buds diminish → preference for stronger flavours.
Reproductive hormones
- Women: perimenopause → menopause (↓ estrogen) → vasomotor sx, bone loss.
- Men: gradual ↓ sperm count & testosterone; exogenous testosterone ↑ prostate/testicular CA risk.

Key Clinical Conditions & Screenings

Obesity: ≈ $38\%$ of U.S. adults; rising in children (age $6$ – $11$ now up to $20\%$ ).
- Correlates: HTN, T2DM, CAD, sleep apnoea, fatty liver, certain cancers, discrimination.
Cardiopulmonary deaths: malignant neoplasms, heart disease top list; unintentional injury & suicide also notable.
Lung CA screening: annual low-dose CT for adults $50$ – $80$ with $\ge30$ pack-yr & current/quit < $15$ yrs.
Colorectal CA
- Routine screening now starts at $45$ (earlier with FHx).
- Options: colonoscopy, FIT, or stool DNA (“Cologuard”) for low-risk pts unwilling to scope.
Osteoporosis
- Pathology: trabecular thinning → porous, brittle bone; silent until fracture.
- DEXA every $2$ yrs > $65$ F or > $70$ M (earlier with risks).
- Risk factors: female sex, early menopause (< $45$ ), FHx, smoking, alcohol, low Ca/Vit D, inactivity.
- Prevention: weight-bearing exercise, Ca $\approx1500$ mg/day (divide ≤ $400$ mg/dose), Vit D, fall-proof environment, bisphosphonates/denosumab/teriparatide when indicated.
Shingles (Herpes zoster)
- Varicella zoster lies dormant in dorsal root ganglia; reactivates with age/stress.
- Unilateral dermatomal painful rash (torso, limbs, face).
- Shingrix: $2$ -dose recombinant vaccine ≥ $50$ yrs (or earlier for immunocompromise).

Nutrition, Exercise & Lifestyle

Similar macro-needs as younger adults but require ↓ total calories (slowed metabolism).
Limit sodium, caffeine, saturated/trans fats; emphasise fluids & fibre.
Calcium/Vit D imperative for bone mass & BP control.
Exercise prescription: ≥ $30$ min moderate aerobic activity $3$ ×/wk + strength & balance.
Volunteering, travel, gardening, art = vehicles for generativity & mental health.

Safety & Occupational Health

Motor-vehicle crashes remain a top injury killer—regular vision checks, safe-driving refresher.
Workplace: protect against noise-induced hearing loss, repetitive-strain, chemical exposure.

Immunisation Recap (Adults ≥ 50 yrs)

Influenza: yearly.
Tetanus-diphtheria-pertussis (Tdap): booster every $10$ yrs (single Tdap then Td).
Shingles (Shingrix): $2$ doses $0$ & ≥ $6$ mo.
Pneumococcal, COVID-19, Hep B/C as per risk.

Stress, Mental Health & Well-being

Chronic stress accelerates HTN, cardiac events, depression.
Relaxation strategies: mindfulness, humour, scheduling “recess,” realistic goal-setting.
Seek counselling/support groups when caregiving or marital strain intensifies.

Cross-Unit Quick Definitions & Numbers

BMR decline begins $\approx18$ yrs.
Ideal Sleep: $7$ – $9$ h.
Normal BMI: $18.5$ – $25$ .
Prediabetes prevalence: $\dfrac13$ U.S. adults; $90\%$ unaware.
Exercise Rx: Early adulthood $3$ – $5$ ×/wk; Middle adulthood ≥ $3$ ×/wk $30$ min.
Colorectal screen: start $45$ yrs (average risk).
Calcium goal: $\approx1500\,\text{mg}$ /day in middle age (≤ $400$ mg per dose for absorption).

"Keep the sweat gland flowing, and the rest of the body follows." – Instructor paraphrasing exercise research