Basal Metabolic Rate (BMR)is the rate of energy utilization in the body during absolute rest when the Person is awake. This study is aimed to ascertain the effect of BMR and obesity on lung function test among male and female medical students of 20-26 years of age. in Nnamdi Azikiwe University College of Health Science Nnewi. On average, 90(50 male, 40 female) medical students took part in this study and their lung function was measured using a Spirometer. Whereas students BMR was calculated using two different predicted Basal metabolic rate equation Harris –Benedict equation (Harris and Benedict equation: BMR (kcal/day) for men P = (13.7516 wt/1 kg + 5.0033 ht/1 cm - 6.7550 age/1 year + 66.4730) and for women P = (9.5634 wt/1 kg + 1.8496 ht/1 cm - 4.6756 age/1 year + 655.0955) and also . Henry and Rees equation (Henry and Rees, 1991): BMR (kcal/day) for men (18–30 years old) = (0.0560 wt + 2.800) × 238.85, and for women (18–38 years old) = (0.0480wt + 2.562) × 238.85. Where p = Total heat production at complete restWt= weight in KgHt=height in cm. The values are constants ) Roza AM, Shizgal HM (1984). BMR is the amount of energy per unit time that a person needs to keep the body functioning at rest. Some of those processes are breathing, blood circulation, controlling body temperature, cell growth, brain and nerve function, and muscle contraindications. Lung functions was measured using the spirometer and the height and weight was measured using the standiometer and weighing balance respectively. From the result obtained when comparing among male and female subjects there is no significant value in male BMR, when comparing between obese and non-obese between male and female subjects weight, height and BMI has significant value. In conclusion this study showed that the relation between predicted basal metabolic rate and indicators of lung function tests was statistically insignificant
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