Journal
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
Volume 69, Issue 6, Pages 621-632Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/gerona/glt136
Keywords
Frailty index; Deficit index; Deficit accumulation; Senescence
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Funding
- Canadian Institutes for Health Research [MOP 126018]
- Fountain Innovation Fund of the Queen Elizabeth II Health Sciences Foundation
- Dalhousie Medical Research Foundation
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We previously quantified frailty in aged mice with frailty index (FI) that used specialized equipment to measure health parameters. Here we developed a simplified, noninvasive method to quantify frailty through clinical assessment of C57BL/6J mice (5-28 months) and compared the relationship between FI scores and age in mice and humans. FIs calculated with the original performance-based eight-item FI increased from 0.06 +/- 0.01 at 5 months to 0.36 +/- 0.06 at 19 months and 0.38 +/- 0.04 at 28 months (n = 14). By contrast, the increase was graded with a 31-item clinical FI (0.02 +/- 0.005 at 5 months; 0.12 +/- 0.008 at 19 months; 0.33 +/- 0.02 at 28 months; n = 14). FI scores calculated from 70 self-report items from the first wave of the Survey of Health, Ageing and Retirement in Europe were plotted as function of age (n = 30,025 people). The exponential relationship between FI scores and age (normalized to 90% mortality) was similar in mice and humans for the clinical FI but not the eight-item FI. This noninvasive FI based on clinical measures can be used in longitudinal studies to quantify frailty in mice. Unlike the performance-based eight-item mouse FI, the clinical FI exhibits key features of the FI established for use in humans.
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