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Related Experiment Video

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Frailty Assessment in an Aging Mouse Model
06:58

Frailty Assessment in an Aging Mouse Model

Published on: September 23, 2025

427

Frailty Assessment in an Aging Mouse Model.

Braydon A Crum1, Heather M Gransee1, Carlos B Mantilla2

  • 1Dept. of Anesthesiology & Perioperative Medicine, Mayo Clinic.

Journal of Visualized Experiments : Jove
|October 13, 2025
PubMed
Summary

A new 16-item frailty index (FI) offers a practical way to assess biological age and health span in mice. This streamlined tool aids geroscience research by enabling rapid, longitudinal frailty assessment without specialized equipment.

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Area of Science:

  • Gerontology and aging research
  • Animal models in preclinical studies
  • Translational geroscience

Background:

  • Frailty index (FI) assesses biological age and health span in animal models.
  • Accumulated health deficits define frailty, indicating vulnerability.
  • Existing murine FI requires specialized equipment, limiting practical application.

Purpose of the Study:

  • To develop and validate a streamlined, 16-item frailty index for mice.
  • To enable practical, longitudinal assessment of frailty and health span in preclinical research.
  • To enhance the translational relevance of animal studies in geroscience.

Main Methods:

  • Adapted a 31-deficit murine FI to a 16-item version.
  • Excluded deficits requiring specialized equipment or invasive testing.
  • Scored deficits (0, 0.5, 1) based on severity; calculated FI as the mean score.
  • Demonstrated feasibility in C57BL/6×129 mice.

Main Results:

  • The 16-item FI showed age-associated increases in frailty.
  • Demonstrated variation in frailty among individual mice.
  • Successfully detected health deficits across multiple physiological systems.
  • Validated the tool for longitudinal tracking and cohort assessment.

Conclusions:

  • The streamlined 16-item FI is a practical, equipment-free tool for assessing mouse frailty and health span.
  • Facilitates incorporation of frailty assessment into diverse experimental designs.
  • Enhances the utility of animal models for geroscience research and translational studies.