Correlation of Wassermans equation and directly measured VO2 max in Indian population - A pilot study

Abstract

Purpose of study: VO_{2 max} can be measured by direct and indirect method. Maximal oxygen uptake (VO₂ max) during a graded maximal exercise test is the objective gold standard method to assess cardio respiratory fitness. Direct method (open circuit spirometry) requires specialized trained equipment, trained personnel and is expensive. VO₂ max is measured indirectly through these tests using regression equations. These regression equations have been formulated on the basis of normative data obtained from Caucasian population. Aim and Objective: To find out the correlation between observed VO₂ max and predicted VO_{2 max} in Indian population. Study design: Cross sectional study Methodology: 22 college students aged between 18-25 years were included after fulfilling the selection criteria demographic data was recorded and vitals were taken before, during and after the procedure. In this VO_{2 max} was calculated directly by gas analyzer using AD instrument and indirectly by Wassermans equation (non exercise based) and data was further analysed stastically. Result: The Interclass Correlation found between direct and indirect methods was 0.39 which shows that there is poor limit of agreement between the two methods. Conclusion: The Wassermans equation was inapplicable to evaluate VO_{2 max} for the students included in the study.