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ReferencesNavigation arrowAuthorsNavigation arrowEarl F. Beard
Jun 19

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Earl F. Beard

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Publications by Earl F. Beard (bibliography)

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1992
 
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Jackson, Andrew S., Beard, Earl F., Wier, Larry T. and Stuteville, J. E. (1992): Multivariate Model for Defining Changes in Maximal Physical Working Capacity of Men, Ages 25 to 70 Years. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 171-174.

“The purpose of this study was to develop a multivariate model with cross-sectional data that defined the decline in VO2max over time, and cross-validate the model with longitudinal data. The cross-sectional sample consisted of 1,608 healthy men who ranged in age from 25 to 70 years. VO2max was directly measured during a maximum Bruce treadmill stress test. Regression analysis showed that the cross-sectional age and VO2max relationship was linear, r = 0.45 and the age decline in VO2max was 0.48 ml/kg/min/year. Multiple regression developed the multivariate model from age, percent body fat ({percent}fat), self-report physical activity (SR-PA), and the interaction of SR-PA and {percent}fat (R = 0.793). Accounting for the variance in percent body fat and exercise habits decreased the influence of age on the decline of VO2max to just -0.27 ml/kg/min/year. This showed that much of decline in maximal physical working capacity was due to physical activity level and percent body fat, not aging. The multivariate equation was applied to the data of the longitudinal sample of 156 men who had been tested twice (Mean Age{Delta} = 3.1 {plusmn} 1.2 years). The correlation between the measured and estimated change in VO2max over time ({Delta}VO2max) was 0.75. The results of the study showed that changes in body composition and exercise habits had more of an influence on changes in maximal physical working capacity than aging. The developed model provides a useful way to quantify the changes in physical working capacity with aging.”

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Jun 19

“ ... there are no simple 'right' answers for most web design questions (at least not for the important ones). What works is good, integrated design that fills a need--carefully thought out, well executed, and tested. ”

-- Steve Krug, Don't Make Me Think, p. 136

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Latest books

The Social Design of Technical Systems: Building technologies for communities
by Brian Whitworth and Adnan Ahmad

 
Start reading

The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam

 
Start reading
 
 

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