Isfahan University of Medical Sciences Journal of Isfahan Medical School 1027-7595 29 157 2011 11 22 The Correlation between Anterior Nasal Resistance and Oronasal Switching Point in Young Non-Smoking, Non-Athletic Men The Correlation between Anterior Nasal Resistance and Oronasal Switching Point in Young Non-Smoking, Non-Athletic Men 1501 1508 13541 FA Mohammad Reza Alipour Assistant Professor, Tuberculosis and Lung Research Center, Tabriz University of Medical Sciences, Tabriz, Iran Amir Hossein Bayat Department of Physiology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Rana Keyhanmanesh Assistant Professor, Department of Physiology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Saeed Khameneh Professor, Tuberculosis and Lung Research Center, Tabriz University of Medical Sciences, Tabriz, Iran Ziba Shoarian Department of Physiology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Journal Article 2010 11 22 Background: Since nasal respiration is physiologically important, many studies have been conducted to find factors necessitating a change from nasal breathing into oronasal breathing during exercise. The present study tried to understand the role of anterior nasal resistance in this switching.Methods: Twelve young, healthy, non-athletic and non-smoker male volunteers with normal body mass index (BMI) were selected after medical examinations. Following anterior rhinomanometry at rest, the subjects participated in an exercise protocol during which ventilation, workload and oronasal switching point (OSP) were measured. The protocol involved a 25 watt increase in workload per minute until the OSP was reached.Findings: There were significant correlations between anterior nasal resistance and OSP, workload, and ventilation difference to OSP ratio (P < 0.05).  Conclusion: Anterior nasal resistance can be considered as an effective factor on OSP occurrence. In addition, by reducing nasal resistance, one can tolerate longer periods of nasal respiration during exercise.  Background: Since nasal respiration is physiologically important, many studies have been conducted to find factors necessitating a change from nasal breathing into oronasal breathing during exercise. The present study tried to understand the role of anterior nasal resistance in this switching.Methods: Twelve young, healthy, non-athletic and non-smoker male volunteers with normal body mass index (BMI) were selected after medical examinations. Following anterior rhinomanometry at rest, the subjects participated in an exercise protocol during which ventilation, workload and oronasal switching point (OSP) were measured. The protocol involved a 25 watt increase in workload per minute until the OSP was reached.Findings: There were significant correlations between anterior nasal resistance and OSP, workload, and ventilation difference to OSP ratio (P < 0.05).  Conclusion: Anterior nasal resistance can be considered as an effective factor on OSP occurrence. In addition, by reducing nasal resistance, one can tolerate longer periods of nasal respiration during exercise.  https://jims.mui.ac.ir/article_13541_42a7e8017ab9578358f118300f4720fb.pdf