Abstract
BackgroundMaximum aerobic capacity (VO2max) is associated with lower cardiovascular and total mortality. Step tests can be used to provide an estimate of (VO2max) in epidemiological or home-based studies. We compared different methods of estimation of VO2max and heart rate recovery and evaluated the relationship of these estimates with cardiovascular risk factors. MethodsData were analysed from 2286 participants in the Tecumseh Community Health Study (>16 y and <70 y) who performed a step test. VO2max was estimated from heart rate using three methods and the results compared. The magnitude of heart rate recovery (HRR) and the time constant of recovery based on different time intervals post-exercise were also estimated. ResultsEstimated VO2max showed good or poor agreement depending on the method used. VO2max correlated inversely with systolic blood pressure (SBP), body mass index (BMI), total cholesterol, blood glucose following a 100 g oral load (PLG) and Framingham risk score. In a multivariable model age sex, cigarette smoking, SBP, BMI and PLG were significantly inversely associated with VO2max. Correlations with risk factors were strongest for HRR measured over the first 30 s of recovery. Only the time constant calculated from the 3 min post-exercise period correlated significantly with risk factors. ConclusionsThe Tecumseh step test can be used to provide estimates of VO2max and heart rate recovery. Estimated VO2max was inversely associated with higher systolic BP, higher BMI and worse glucose tolerance. Measurements of HRR over the first 30 s and the time constant calculate from the first 3 min of recovery correlate most closely with risk factors.
Highlights
A higher level of cardiorespiratory fitness, assessed as maximum aerobic capacity (VO2max), is associated with lower cardiovascular and total mortality.[1]
Step testing combined with measurement of heart rate is a convenient, safe and inexpensive submaximal test from which VO2max can be estimated with acceptable accuracy3e6 and precision.[7,8]
This study demonstrates that estimates of VO2max derived from a Tecumseh step test, using a validated equation, agree closely with those estimated by the Astrand/Van Dobeln equations,[5,6] but considerably less well with estimates based on the equation formulated by Sharkey and used by Marley and Linnerud.[3]
Summary
A higher level of cardiorespiratory fitness, assessed as maximum aerobic capacity (VO2max), is associated with lower cardiovascular and total mortality.[1] direct measurement of peak oxygen consumption by incremental exercise is time consuming, requires appropriate expertise, and is not entirely without risk.[2] Step testing combined with measurement of heart rate is a convenient, safe and inexpensive submaximal test from which VO2max can be estimated with acceptable accuracy3e6 and precision.[7,8] Step tests are appropriate for epidemiological work or studies in the home since steps are transportable and stepping technique requires little practice.[9]. We compared different methods of estimation of VO2max and heart rate recovery and evaluated the relationship of these estimates with cardiovascular risk factors. Conclusions: The Tecumseh step test can be used to provide estimates of VO2max and heart rate recovery. Measurements of HRR over the first 30 s and the time constant calculate from the first 3 min of recovery correlate most closely with risk factors.
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