Journal
PHYSIOLOGICAL GENOMICS
Volume 22, Issue 1, Pages 76-85Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/physiolgenomics.00243.2004
Keywords
average daily activity; body weight; broad-sense heritability; inbred mice
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Funding
- NIA NIH HHS [AG-022417] Funding Source: Medline
- NIDDK NIH HHS [DK-61635] Funding Source: Medline
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In humans, physical activity declines with age. We tested the hypothesis that genetic background and age interact to determine daily wheel-running physical activity patterns in mice. Five female mice from ten inbred strains (A/J, AKR/J, Balb/cJ, CBA/J, C3H/HeJ, C3Heb/FeJ, C57B1/6J, C57L/J, DBA/2J, and SWR/J) were studied for 26 wk starting at 10 wk of age. All mice were housed in separate cages, each with a running wheel and magnetic sensor. Throughout the 26-wk period, age-related change in daily duration ( P < 0.0001), daily distance ( P < 0.0001), and average velocity (P = 0.0003) differed between the inbred strains. Unlike the other strains, SWR/J mice increased their running-wheel activity throughout the 6-mo time period. Broad-sense heritability estimations for the strains across the 26-wk period ranged between 0.410 and 0.855 for the three physical activity phenotypes. Furthermore, the broad-sense heritability estimates for daily running-wheel distance differed across time and suggested an interaction between genetic background and age on physical activity in these inbred mice.
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