Strong cross sectional age trends were found in noninvasive cardiovascular testing of 50 men aged 36 to 57. They were first tested while resting immediately prior to undergoing a standard electrocardiographic exercise protocol (Bruce graded treadmill test). The reproducibility of each measurement was assessed and found to be high. Cardiovascular testing of each man was repeated during the recovery period 5 minutes after cessation of exercise. In most cases, measurements from resting and recovery periods were highly and significantly correlated. Despite this fact, cross sectional age trends based upon the recovery period were either not significant statistically, or greatly underestimated. These results demonstrate the capability of exogenous factors such as exercise, invasive testing, or psychic stress to vitiate strong cross sectional trends useful for research in aging.
KeywordsRecovery Period Exercise Protocol Exogenous Factor Treadmill Test Invasive Testing
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