The formula for calculating the predicted value of cardiorespiratory endurance using a foot rest-based cardiorespiratory exercise device

This study developed a formula for calculating the predicted VO₂ max value using a prototype model of foot-based cardiorespiratory exercise. Forty sedentary workers (20 men and 20 women) were enrolled via consecutive sampling. They underwent direct measurement of VO₂ max using spiroergometry as the gold standard; the predicted VO₂ max value was calculated using a prototype model of foot-based cardiorespiratory exercise, which was performed on consecutive days. Multivariate linear regression analysis was used to formulate the equation for the predicted VO₂ max value by including potential contributing variables: gender, body height, body weight and heart rate. Bland–Altman test was used for assessing the agreement level for the predicted VO₂ max value. The equation for the predicted VO₂ max value was formulated as 3.2 + 0.15 optimal exercise heart rate −5.5 sexes (0 for men, 1 for women). The agreement level for the formula was acceptable in all measurement result ranges. The formula developed in this study can be used to measure the predicted VO₂ max value with an acceptable agreement level.