Evaluation of MET values on the NuStep 4000 recumbent stepper

Abstract

The purposes of this study were to determine the accuracy of the MET values on the NuStep Recumbent Stepper console compared to measured values, and if they were different, develop a regression equation to more accurately predict MET values on the NuStep across a wide range of workloads. Fitty male and female volunteers (mean age = 63.6 + 9.61 years) with known cardiac disease or significant risk factors for CAD served as Ss. All Ss completed 1 submaximal test on the NuStep beginning at either 25 or 50 watts and increasing by 25-50 watts per stage. Each stage was 5 min in duration and VO,(METS) and HR were recorded each minute. It was found that MET levels on the NuStep ovcrpredicted the measured MET values by 44-73%. Based on these findings, the following regression equation was developed using a stepwise multiple regression technique. Predicted METS = (4.927 + 6.47 (weight in kg) + .03245 (watts2)}/(weight in kg * 3.5) The new equation had a R = .92, R2 = .84, SEE = -62 METS. Thus, this new equation should provide more accurate estimation of MET values on the NuStep, especially for an older cardiac population.