Fitness Program

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Topics Addressed

  1. Experimental Design
  2. Public Health
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Back in the mid-1970s the University of Washington initiated an experimental physical fitness program for its students. To evaluate its effects, all those who registered for the program at the beginning of the first year of operation were tested at registration and retested at the end of the year. Physical fitness improved remarkably. As a result, it was decided to run the program for a second year. It was not considered necessary to test new participants at the beginning of the second year, since the results from the first year were available as a benchmark. At the end of the second year, all the participants were tested. The tests showed a marked deterioration in physical fitness by comparison with the scores at the beginning of the first year.

Does this mean that the second year of the program was a failure?
If so, what changes would you have recommended to the program leaders to revitalize it?
If not, what other explanation do you have for the results, and what would you have done to improve the design of the study?

Explain briefly.

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George Michailides
gmichail@stat.ucla.edu