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Related Experiment Videos

Does exercise reduce all-cancer death rates?

R J Shephard1

  • 1School of Physical and Health Education, Faculty of Medicine, University of Toronto, Canada.

British Journal of Sports Medicine
|June 1, 1992
PubMed
Summary
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Physical fitness may reduce cancer mortality risk, but the association is weaker than previously thought. Reanalysis suggests lifestyle factors like smoking and sedentary behavior significantly influence cancer risk, not just fitness alone.

Area of Science:

  • Epidemiology
  • Public Health
  • Cancer Research

Background:

  • Previous studies suggested a link between initial physical fitness and reduced cancer mortality.
  • Concerns were raised about potential confounding factors, such as health habits, influencing these findings.

Purpose of the Study:

  • To reanalyze existing data on physical fitness and cancer death risk.
  • To investigate the influence of confounding variables, particularly cigarette smoking, on the observed association.

Main Methods:

  • Reanalysis of previously collected data on initial physical fitness and cancer mortality.
  • Statistical adjustments were made to account for cigarette smoking, assuming a uniform doubling of cancer death risk.

Main Results:

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  • The association between physical fitness and reduced cancer death risk remained after accounting for smoking.
  • However, the strength of this association was weaker than initially reported.
  • Potential bias from the quantity of smoking linked to fitness status and untraced deaths was noted.

Conclusions:

  • While physical fitness may offer some protection against cancer mortality, the effect is less pronounced than previously suggested.
  • Lifestyle factors, including smoking and sedentary behavior, play a significant role in cancer risk.
  • The observed association between low fitness and higher cancer risk may be partly explained by socioeconomic factors and unaddressed biases.