Author(s): Dr. Sonal P. Karpe, Dr. Priti L. Meshram

Introduction: The anaerobic threshold (AT), also known as the lactate threshold, lactic acid threshold, gas exchange threshold, or ventilatory threshold, is considered an estimator of the onset of met abolic acidosis caused predominantly by the increased rate of rise of arterial [lactate] during exercise. It is an accurate marker of fitness or exercise tolerance of an individual. The objective of the study was to study anaerobic threshold in normal healthy adults and to study variations in exercise tolerance as per demographic and anthropometric parameters. Methodology: This prospective study was conducted at a cardiopulmonary exercise testing unit of a tertiary care public hospital. 50 healthy adult participants with no history of cardiac and respiratory disorders were screened for and included in the study to determine their anaerobic threshold. Results: Anaerobic threshold (AT) in healthy adults was higher in males compared to females. As the age increased Anaerobic threshold decreased. There was a positive correlation between AT and height. The weight showed no significant correlation with AT. There was significant inverse correlation between Body Mass Index (BMI) and AT. The AT of nonsedentary subjects was significantly higher than sedentary subjects. Majority of subjects showed significant improvement in their AT after lifestyle modification in the form of moderate physical activity for three months. Conclusion: The Anaerobic threshold varied in the population studied as per their age, gender and anthropometric parameters. AT was more in males and younger subjects. Height and BMI and physical activity showed a more consistent correlation with AT than weight. Key words: Anaerobic threshold, Age, Gender, Height, Weight, BMI, lifestyle.