Wellness Longevity · Supplementary · from Wellness Longevity

Case 1: Sarcopenia in Aging Adult

Patient Presentation

Demographics: 72-year-old female retired teacher

Chief Complaint: "I've been feeling weaker and I fell twice in the past month."

History of Present Illness: Mrs. Nakamura presents to her primary care physician after two falls in the past four weeks. The first fall occurred when she tripped on a curb while walking to her mailbox; the second happened when she attempted to rise from a low chair and her legs "gave way." She did not sustain fractures but developed significant bruising on her right hip and left forearm. She reports a progressive decline in physical strength over the past two years, noting difficulty opening jars, climbing stairs, and carrying grocery bags.

She describes unintentional weight loss of approximately 15 pounds over the past 18 months despite no change in appetite. She eats two meals daily, primarily consisting of toast, soup, and tea. She rarely eats meat or fish, citing difficulty with chewing and a preference for softer foods. Her protein intake is estimated at 0.4 g/kg/day, well below recommended levels for older adults.

She was previously active, walking 30 minutes daily and attending a weekly yoga class, but discontinued both activities six months ago due to fatigue and fear of falling. She now spends most of the day seated and reports difficulty rising from her bed in the morning.

Past Medical History:

• Osteoporosis (diagnosed at age 65)
• Hypothyroidism
• Gastroesophageal reflux disease
• Total knee replacement (left, age 68)

Medications:

• Levothyroxine 75 mcg daily
• Alendronate 70 mg weekly
• Omeprazole 20 mg daily
• Calcium 600 mg with vitamin D 400 IU daily

Social History:

• Widowed 3 years ago; lives alone in two-story home
• Retired elementary school teacher
• No alcohol or tobacco use
• Limited social engagement since husband's death

Family History:

• Mother: Hip fracture at age 78, died of complications
• Father: Heart disease, died at age 80

Physical Examination

• Vital Signs: BP 132/74 mmHg (supine), 118/68 mmHg (standing), HR 78 bpm (supine), 92 bpm (standing), RR 16, Temp 97.8°F, BMI 19.2 kg/m²
• General: Thin, frail-appearing elderly female
• HEENT: Temporal wasting; poor dentition with multiple missing molars
• Cardiovascular: Regular rate and rhythm, no murmurs; orthostatic hypotension present
• Respiratory: Clear to auscultation
• Musculoskeletal: Decreased muscle bulk in quadriceps and deltoids bilaterally; grip strength 14 kg (right), 12 kg (left); well-healed left knee surgical scar
• Neurological: Intact cognition (MMSE 28/30); mildly decreased proprioception bilateral feet
• Functional Assessment:
• Gait speed: 0.7 m/s (normal > 1.0 m/s)
• Timed Up and Go (TUG): 16 seconds (normal < 12 seconds)
• Chair stand test: Unable to complete 5 stands without using arms
• SARC-F questionnaire score: 7/10 (positive screen for sarcopenia)

Workup and Results

Laboratory Studies:

Imaging/Additional Studies:

• DEXA scan: Lumbar T-score -2.8; femoral neck T-score -2.6; appendicular skeletal muscle mass index (ASMI) 5.2 kg/m² (sarcopenia cutoff < 5.5 for women)
• DEXA body composition: Total lean mass decreased 12% from scan 3 years prior
• Bioimpedance analysis: Phase angle 4.1° (low, indicating poor cellular health and malnutrition)

Clinical Image

Pathophysiology of sarcopenia illustrating the convergent mechanisms of aging-related hormonal decline, chronic inflammation, physical inactivity, and inadequate protein intake leading to progressive muscle mass and strength loss. Source: Educational illustration.

Diagnosis

Severe Sarcopenia with Falls (ICD-10: M62.84, R29.6)

Key Diagnostic Criteria (EWGSOP2 2019 Revised Definition):

• Low muscle strength: Grip strength < 16 kg (female cutoff)
• Low muscle quantity: ASMI 5.2 kg/m² (below 5.5 cutoff for women)
• Low physical performance: Gait speed 0.7 m/s (below 0.8 m/s threshold) — classifies as "severe" sarcopenia
• Positive SARC-F screening score (≥ 4)

Treatment Plan

1. Nutrition Intervention: Increase protein intake to 1.2-1.5 g/kg/day (target 65-80 g/day); leucine-enriched essential amino acid supplementation (3 g leucine per meal); refer to dietitian for meal planning with emphasis on protein-rich, texture-modified foods
2. Resistance Exercise Program: Progressive resistance training 2-3 times weekly under physical therapy supervision; focus on large muscle groups (squats, leg press, rows); begin at 40-60% 1-RM and progress; combine with balance training
3. Vitamin D Repletion: Vitamin D3 50,000 IU weekly for 8 weeks, then 2000 IU daily maintenance; target serum level > 40 ng/mL
4. Fall Prevention: Home safety evaluation by occupational therapy; install grab bars, remove throw rugs, improve lighting; consider personal emergency response system
5. Dental Referral: Address missing dentition to improve ability to chew protein-rich foods
6. Address Social Isolation: Refer to community senior center programs; consider group exercise classes for social engagement and accountability
7. Medication Review: Discontinue omeprazole if possible (contributes to malabsorption of calcium, magnesium, B12); assess for deprescribing opportunities
8. Follow-up: Reassess grip strength, gait speed, and body composition in 3 months

Key Learning Points

• Sarcopenia is now recognized as a disease entity (ICD-10: M62.84) defined by the EWGSOP2 as low muscle strength (primary criterion) plus low muscle quantity/quality, with severity graded by physical performance measures
• Protein requirements for older adults are higher than for younger adults (1.0-1.2 g/kg/day for healthy elderly; 1.2-1.5 g/kg/day for those with sarcopenia), yet most older adults consume below even the standard RDA of 0.8 g/kg/day
• Leucine is the key amino acid that triggers muscle protein synthesis via the mTOR pathway; a threshold of 2.5-3.0 g leucine per meal is needed to overcome age-related anabolic resistance
• Resistance exercise is the single most effective intervention for sarcopenia and should be prescribed as a medical treatment, not merely lifestyle advice
• Sarcopenia, osteoporosis, and malnutrition frequently coexist in older adults (the "osteosarcopenic obesity" or "geriatric triad"), and each condition accelerates the others

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