Related Experiment Video
Updated: Aug 10, 2026

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice
Published on: November 13, 2016
The effect of aging on the rate of linear nail growth
Abstract:
The linear nail growth rate is a simple, inexpensive, noninvasive technique for the measurement of aging. When the many endogenous and exogenous factors known to influence this rate are either controlled or considered, the measurement of the rate for 1 year gives data that are both age-related and age-caused. The rate of linear nail growth decreases 50% over the life spans of both dogs and humans. In the beagle, which has a life span 20% that of man, the rate of decrease is 5 times faster than in man. There are circadian and multiple-year biorhythms of the rate of linear nail growth. There are approximately 7-yr periods of slow decline that alternate with 7-yr periods of more rapid decline.
Related Concept Videos
The Effect of Aging on Tissues
Accessory Structures of the Skin: Hair Growth and Types
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution
Pharmacodynamics in Geriatric Patients: Effects of Age
Aging
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

