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Fried Frailty Phenotype
Fried Phenotype: Defines physical frailty as a biological syndrome. Proper application requires objective measurement of grip strength and gait speed.
Are criteria present?
1. Unintentional Weight Loss
Lost ≥ 10 lbs (4.5 kg) or ≥ 5% of body weight in past year unintentionally.
2. Exhaustion (Self-Report)
Felt that "everything I did was an effort" OR "I could not get going" for ≥ 3 days in the past week.
3. Low Physical Activity
Kcal expenditure/week below threshold (Men < 383 kcal/wk, Women < 270 kcal/wk). E.g., almost completely sedentary.
4. Slowness (Gait Speed)
Time to walk 15 feet is slow based on sex and height. (Typically < 0.8 m/s).
5. Weakness (Grip Strength)
Grip strength measured by dynamometer is in lowest 20% for sex and BMI.
Guidelines & Evidence
Clinical Details
Section 1
When to Use
When to Use
Gold standard classification of physical frailty in research and clinical trials.
Detailed phenotypic assessment in geriatric specialist clinics.
Identifying specific physiological deficits (e.g., sarcopenia via grip strength) to target interventions.
Physical Frailty Focus
The Fried model defines frailty strictly as a biological syndrome of decreased reserve and resistance to stressors. Unlike the Clinical Frailty Scale or Edmonton Frail Scale, it explicitly excludes cognition and psychological state, focusing entirely on physical phenotype.
≥ 10 lbs (4.5 kg) or ≥ 5% of body weight in past year
Exhaustion
Self-report: "I felt that everything I did was an effort" or "I could not get going" ≥ 3 days/week
Low Physical Activity
Kcals/week below gender-specific thresholds (e.g., <383 kcal/wk for men, <270 kcal/wk for women)
Slowness (Gait Speed)
Time to walk 15 feet below BMI and gender-specific cutoffs (typically <0.8 m/s)
Weakness (Grip Strength)
Grip strength below BMI and gender-specific cutoffs measured via dynamometer
Section 3
Pearls/Pitfalls
Objective Measurement Required
Proper application of the Fried Phenotype requires a Jamar dynamometer (for grip strength) and a measured 15-foot walking course. Without these, the phenotype cannot be accurately assessed. Use the FRAIL scale if objective tools are unavailable.
Section 4
Next Steps
Targeted Interventions
Section 5
Evidence Appraisal
Primary Reference
Frailty in older adults: evidence for a phenotype.
Fried LP et al. • J Gerontol A Biol Sci Med Sci.. 2001;56(3):M146-56. The seminal paper defining the frailty phenotype using data from the Cardiovascular Health Study (5,317 participants).
Section 6
Origins
Linda Fried
Defined by Linda Fried in 2001, this model shifted the geriatric paradigm by operationalising frailty not merely as "extreme old age" or "severe disability," but as a distinct, measurable biological syndrome characterised by a cycle of shrinking reserves (sarcopenia, undernutrition, lowered metabolic rate).
