A specific activity questionnaire to measure the functional capacity of cardiac patients

S.L. Rankin, T.G. Briffa, A.R. Morton, Joe Hung

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    62 Citations (Scopus)


    Exercise testing is often performed in persons with cardiac disease to measure their functional capacity. Physical activity questionnaires assessing functional capacity have been used as a low-cost and convenient alternative to exercise testing, but have not been well validated against measured oxygen consumption in a cardiac population. This study assesses the ability of a simple, 13-item, self-administered activity questionnaire, known as the Specific Activity Questionnaire (SAQ), to measure functional capacity prospectively in a large sample of cardiac patients. Ninety-seven consecutive cardiac out-patients (85 men and 12 women aged 59 +/- 10 years [mean +/- SD]) completed the SAQ before an elective symptom-limited treadmill test. Subjects returned within 10 days to repeat the treadmill test, following the same protocol, with the additional measurement of peak oxygen consumption, VO2 (ml . kg(-1) . min(-1)), using open circuit spirometry. The SAQ score was significantly related to measured peak VO2 (r = 0.57, p <0.001). Stepwise multiple linear regression analysis found that the addition of patient age, height, and body weight to SAQ score improved the measurement of peak VO2, accounting for 51% of the sample variance (R = 0.71, p <0.001). Peak VO2 was obtained from the following regression formula:VO2 = (2.36)SAQ + (0.35)HEIGHT - (0.19)AGE-(0.16)BODY WEIGHT - 33.89; SEE 6.43.Thus SAQ, a simple 13-item self-administered activity questionnaire, is able to provide a moderately good measure of functional capacity in cardiac patients and may be a useful tool in studies of the cardiac population when formal exercise testing is impractical or uneconomical.
    Original languageEnglish
    Pages (from-to)1220-1223
    JournalAmerican Journal of Cardiology
    Issue numberN/A
    Publication statusPublished - 1996


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