Changes in spirometry parameters with the change in posture from sitting to supine positions in asymptomatic normal weight, overweight and obese young Omani males

  • Redha Issa Al Lawati Oman Medical Specialty Board, Muscat, Oman.
  • Al Yaqdhan Hamdan Al Atbi Oman Medical Specialty Board, Muscat, Oman.


Objectives Worldwide obesity is one of the major problems. Some studies say that in Oman it reaches up to 50% of the adult population.Obesity creates many complications in the body, mainly the respiratory system. Few studies were done to evaluate the effect of obesity onairflow parameters in pulmonary function test. Our study evaluates the effect of obesity on the airflow parameters while changing theposture from sitting to supine position in non-obese, overweight, and obese individuals.Methods About 30 subjects were divided into three groups according to their BMI. Physical examination was done and questionnaire wasgiven to the subjects prior to the procedure. Forced vital capacity maneuver was done for each subject at least five times spirometryparameters were derived from the flow volume curve obtained after expiratory effort.Results All the parameters were decreasing from sitting to supine position in all the three BMI groups except PEF in overweight group. Therewas no statistically significant difference between the three groups while comparing them in sitting or supine position. Also, the comparisonbetween each two groups in mean percentage difference showed no significant difference.Conclusion The study showed that the difference in airflow parameters with the change in posture from sitting to supine position was notsignificantly different in obese subjects as compared with non-obese and overweight subjects. This insignificant result may be due to smallsample size or because of the fixed age group [19–25 years old]. Females were not included in the study. The study has generated somebackground information on lung functions of obese but otherwise asymptomatic Omani males which can be used for study of lungfunction in morbidly obese subjects.
share this Article by


1. Al-Moosa S, Allin S, Jemiai N, Al-Lawati J, Mossialos E. Diabetes and urbanization in the Omani population: an analysis of national survey data. Popul Health Metr. 2006;4:5.
2. Ulger Z, Demir E, Tanaç R, Gökşen D, Gülen F, Darcan S, et al. The effect of childhood obesity on respiratory function tests and airway hyperresponsiveness. Turk J Pediatr. 2006;48:43–50.
3. Luder E, Melnik TA, DiMaio M. Association of being overweight with greater asthma symptoms in inner city black and Hispanic children. J Pediatr. 1998;132:699–703.
4. Redinger RN. The pathophysiology of obesity and its clinical manifestations. Gastroenterol Hepatolk. 2007;3:856–863.
5. Hakala K, Stenius-Aarniala B, Sovijärvi A. Effects of weight loss on peak flow variability, airways obstruction, and lung volumes in obese patients with asthma. Chest. 2000;118:1315–1321.
6. Sin DD, Jones RL, Man SF. Obesity is a risk factor for dyspnea but not for airflow obstruction. Arch Intern Med. 2002;162:1477–1481.
7. Powers MA. The obesity hypoventilation syndrome. Respiratory Care. 2008;53:1723–1730.
8. Deane S, Thomson A. Obesity and the pulmonologist. Arch Dis Child. 2006;91:188–191.
9. Colledge NR, Walker BR, Ralston SH. Obesity in Davidson’s Principles & Practice of Medicine. 21st ed., London, 2010, pp. 116–121.
10. Freedman DS. Center of Disease Control and Prevention (CDC). Obesity - United States, 1988–2008. MMWR Suppl. 2011;60:73–77.
11. Sales-Peres SH, Goya S, Sant’Anna RM, Silva HM, Sales-Peres Ade C, Silva RP, et al. [Prevalence of overweight and obesity, and associated factors in adolescents, at the central west area of the state São Paulo (SP, Brazil)]. Cien Saude Colet. 2010;15:3175–3184.
12. McCoy EK, Thomas JL, Sowell RS, George C, Finch CK, Tolley EA, et al. An evaluation of peak expiratory flow monitoring: a comparison of sitting versus. standing measurements. J Am Board Fam Med. 2010;23: 166–170.
13. Suratt PM, Wilhoit SC, Hsiao HS, Atkinson RL, Rochester DF. Compliance of chest wall in obese subjects. J Appl Physiol Respir Environ Exerc Physiol. 1984;57:403–407.
14. Inselma LS, Milanese A, Deurloo A. Effect of obesity on pulmonary function in children. Pediatr Pulmonol. 1993;16:130–137.
15. Elliott AR, Prisk GK, Guy HJ, Kosonen JM, West JB. Forced expirations and maximum expiratory flow-volume curves during sustained microgravity on SLS-1. J Appl Physiol. 1996;81:33–43.
16. Saxena Y, Purwar B, Upmanyu R. Adiposity: determinant of peak expiratory flow rate in young Indian adults male. Indian J Chest Dis Allied Sci.
How to Cite
AL LAWATI, Redha Issa; AL ATBI, Al Yaqdhan Hamdan. Changes in spirometry parameters with the change in posture from sitting to supine positions in asymptomatic normal weight, overweight and obese young Omani males. Iraq Medical Journal, [S.l.], v. 2, n. 3, p. 64-67, sep. 2018. ISSN 2521-8492. Available at: <>. Date accessed: 20 nov. 2018.