Incremental value of Veterans Specific Activity Questionnaire and the YMCA-step test for the assessment of cardiorespiratory fitness in population-based studies

Abstract

Background

Cardiorespiratory fitness is a well-established independent predictor of cardiovascular health. However, the relevance of alternative exercise and non-exercise tests for cardiorespiratory fitness assessment in large cohorts has not been studied in detail. We aimed to evaluate the YMCA-step test and the Veterans Specific Activity Questionnaire (VSAQ) for the estimation of cardiorespiratory fitness in the general population.

Methods

One hundred and five subjects answered the VSAQ, performed the YMCA-step test and a maximal cardiopulmonary exercise test (CPX) and gave BORG ratings for both exercise tests (BORG_STEP, BORG_CPX). Correlations of peak oxygen uptake on a treadmill (VO_{2_PEAK}) with VSAQ, BORG_STEP, one-minute, post-exercise heartbeat count, and peak oxygen uptake during the step test (VO_{2_STEP}) were determined. Moreover, the incremental values of the questionnaire and the step test in addition to other fitness-related parameters were evaluated using block-wise hierarchical regression analysis.

Results

Eighty-six subjects completed the step test according to the protocol. For completers, correlations of VO_{2_PEAK} with the age- and gender-adjusted VSAQ, heartbeat count and VO_{2_STEP} were 0.67, 0.63 and 0.49, respectively. However, using hierarchical regression analysis, age, gender and body mass index already explained 68.8% of the variance of VO_{2_PEAK}, while the additional benefit of VSAQ was rather low (3.4%). The inclusion of BORG_STEP, heartbeat count and VO_{2_STEP} increased R² by a further 2.2%, 3.3% and 5.6%, respectively, yielding a total R² of 83.3%.

Conclusions

Neither VSAQ nor the YMCA-step test contributes sufficiently to the assessment of cardiorespiratory fitness in population-based studies.

Keywords

Cardiorespiratory fitness peak oxygen uptake VSAQ questionnaire YMCA-step test

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