Abstract
Background: Factors determine the change in aerobic capacity (VO2 max). This study discovered an association between body mass index (BMI) with aerobic capacity (VO2 max) in apparently healthy male young adults.

Aims and Objectives: The study aimed to determine the effect of obesity on cardiopulmonary health of apparently healthy male young adults with following objectives: (i) To compare the VO2 max in different BMI groups and (ii) to study the correlation of BMI with VO2 max.

Materials and Methods: A study was conducted among 100 male subjects of 18–30 years assessing BMI (height/weight2) and VO2 max by CPET Ergo-bike machine. Statistical analysis was done with unpaired t-test.

Results: In correlation between four BMI groups and their respective VO2 max, we found that VO2 max in the underweight group (BMI <18.5) is positively correlated and statistically significant. In the normal group (BMI 18.5–24.9), it is negatively correlated and insignificant. In the overweight group (BMI 24.9–29.9), it is negatively correlated and significant and in the obese group (BMI ≥30), it is negatively correlated and not significant.

Conclusion: VO2 max is gradually increasing with BMI toward the normal range and decreasing away from the normal range significantly in both underweight and overweight groups. Whereas, this change of VO2 max is not so significant in both normal and obese groups as per. As BMI is inversely related to cardiopulmonary function, persons having high BMI can be motivated toward a healthy lifestyle.

Key words: VO2 max; Body Mass Index; CPET ergo-bike