Physical activity as a factor in the action of dietary restriction on aging

Effects in Fisher 344 rats

R. J M McCarter, I. Shimokawa, Yuji Ikeno, Y. Higami, G. B. Hubbard, B. P. Yu, C. A. McMahan

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Dietary restriction (DR) slows the rate of aging in laboratory rodents but the mechanism of action is unknown. DR is known to induce beneficial effects in a variety of tissues and organ systems. DR also maintains high levels of physical activity over the life span. We tested the hypothesis that lifelong physical activity is an important component of the anti-aging action of DR. Male specific pathogen-free Fischer 344 rats were divided into 4 groups at 6 weeks of age: A: fed ad libitum; AE: fed ad libitum and in cages with running wheels; B: fed 60% ad libitum; BE: fed 60% ad libitum and in cages with running wheels. Running activity and spontaneous cage activity were measured over 24 hours and over the life span. Metabolic rate was measured indirectly by analysis of air entering and leaving cages. AE rats exhibited low levels of running activity and run very little beyond 6 months of age. In contrast, BE rats sustained high running levels even after all A and AE rats had died. High levels of wheel running did not decrease spontaneous cage activity. Median life span (50% survival) was in the order A = AE < B < BE. Ten percent survival was in the order A = AE < B = BE. BE rats had greatest median life span and also highest specific metabolic rate. Exercise and DR altered pethology: At death BE rats had a high incidence of cardiomyopathy, whereas A and AE rats had high incidence of chronic nephropathy and pituitary tumors. The data indicate that increased physical activity is probably not an important factor in the action of DR on aging.

Original languageEnglish (US)
Pages (from-to)73-79
Number of pages7
JournalAging clinical and experimental research
Volume9
Issue number1-2
StatePublished - Feb 1997

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Running
Specific Pathogen-Free Organisms
Incidence
Inbred F344 Rats
Pituitary Neoplasms
Cardiomyopathies
Rodentia
Air

Keywords

  • aging
  • dietary restriction
  • metabolic rate
  • voluntary exercise

ASJC Scopus subject areas

  • Aging
  • Geriatrics and Gerontology

Cite this

McCarter, R. J. M., Shimokawa, I., Ikeno, Y., Higami, Y., Hubbard, G. B., Yu, B. P., & McMahan, C. A. (1997). Physical activity as a factor in the action of dietary restriction on aging: Effects in Fisher 344 rats. Aging clinical and experimental research, 9(1-2), 73-79.

Physical activity as a factor in the action of dietary restriction on aging : Effects in Fisher 344 rats. / McCarter, R. J M; Shimokawa, I.; Ikeno, Yuji; Higami, Y.; Hubbard, G. B.; Yu, B. P.; McMahan, C. A.

In: Aging clinical and experimental research, Vol. 9, No. 1-2, 02.1997, p. 73-79.

Research output: Contribution to journalArticle

McCarter, RJM, Shimokawa, I, Ikeno, Y, Higami, Y, Hubbard, GB, Yu, BP & McMahan, CA 1997, 'Physical activity as a factor in the action of dietary restriction on aging: Effects in Fisher 344 rats', Aging clinical and experimental research, vol. 9, no. 1-2, pp. 73-79.
McCarter, R. J M ; Shimokawa, I. ; Ikeno, Yuji ; Higami, Y. ; Hubbard, G. B. ; Yu, B. P. ; McMahan, C. A. / Physical activity as a factor in the action of dietary restriction on aging : Effects in Fisher 344 rats. In: Aging clinical and experimental research. 1997 ; Vol. 9, No. 1-2. pp. 73-79.
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