Direct method (open circuit spirometry) requires specialized trained equipment, trained personnel and is expensive. Maximal oxygen uptake (VO 2 max) during a graded maximal exercise test is the objective gold standard method to assess cardio respiratory fitness. Purpose of study: VO 2 max can be measured by direct and indirect method. Health promotion policies and physical activity programs should be designed to improve cardio respiratory fitness. Physical fitness performance was better in male students than female students. Conclusion: From the study it was concluded that our subjects fitted in the category of fair on cardio respiratory fitness scale, could be because of the decreased physical activity, unhealthy lifestyle behaviors as are established during the years of gaining education, which may influence adult behavior and health status. The mean value of VO 2max was found significantly higher in male as compared to female students. Result: In present study it was found that mean value of VO 2max for males was ml/kg/min and for females it was ml/kg/min. QCT is the simplest one to determine cardio respiratory fitness in terms of maximum oxygen uptake. Method: A total of fifty seven young adult male and female students, around age group of 18-24 years were recruited by simple random sampling from Maharishi Markandeshwar University, Haryana.VO 2max was estimated indirectly by following the protocol of Queen's College Step Test method. The main aim of study was to assess and compare the cardio respiratory fitness in terms of maximum aerobic capacity among the young adult male and female medical students of Maharishi Markandeshwar University, Mullana, Haryana. Objective: Cardio respiratory fitness in terms of maximum oxygen uptake reflects physical fitness of a person.VO 2max is single best measure of cardio respiratory capacity and is considered as a bench mark to quantify cardiovascular function capacity and aerobic fitness.
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