American Journal of Epidemiology Vol. 122, No. 1: 101-105
Copyright © 1985 by The Johns Hopkins University School of Hygiene and Public Health
research-article |
SELF-REPORTED PHYSICAL ACTIVITY COMPARED WITH MAXIMAL OXYGEN UPTAKE
1Division of Cardiology, The Memorial Hospital Pawtucket, RI 02860
2Pawtucket Heart Health Project, The Memorial Hospital Pawtucket, RI
3Department of Community Health, Brown University Providence, RI
4Department of Medicine, Brown University Providence, RI
Reprint requests to Dr. Richard A. Carleton
Maximal oxygen uptake has been used as a measure of physical fitness. This measure increases by approximately 25% when sedentary individuals become more physically active. Oxygen uptake measurement in the laboratory or estimation in fieldwork is complex and costly with finite risk. For the present study, 36 men and 32 women completed the Paffenbarger Physical Activity Index Questionnaire, including a sweat-inducing physical activity frequency question, and had measurement of oxygen uptake during pedal ergometry. Using maximal oxygen uptake as the measure of fitness, the authors found that the Paffenbarger Physical Activity Index, although more detailed, may be less valid than the simpler sweat induction frequency question for estimating fitness. The correlations observed between the sweat question and oxygen uptake were 0.54 for males, 0.26 for females, and 0.46 for the total group. The correlations between the Physical Activity Index and oxygen uptake were 0.26 for males, 0.08 for females, and 0.29 for the total group. The regression relationship (oxygen uptake=1.92x (sweat days)+ 23.76; standard error of estimate= 8.63 ml/kg/min) is significant for sweat versus oxygen uptake. While the confidence interval limits the practical ability to predict individual values, low cost, absence of risk, and population validity suggest that fitness can be assessed rapidly and simply for epidemiologic studies with a simple "sweat" question.
exertion; physical fitness
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