Award Date


Degree Type


Degree Name

Master of Science (MS)


Kinesiology and Nutrition Sciences

First Committee Member

James Navalta

Second Committee Member

John Young

Third Committee Member

Richard Tandy

Fourth Committee Member

Szu-Ping Lee

Fifth Committee Member

Kathryn Korgan

Number of Pages



When comparing oral breathing versus nasal breathing more volume of air can be transported through the oral passageway, but nasal breathing can lead to slower respiration rates and cleaner inspired air. The purpose of this study is to find the most efficient mode of breathing during different intensities of submaximal aerobic exercise. There were 9 males and 10 females that completed this study. First test was a VO2 Max test, 3.0 mph for 3 minutes, with increases in 1.0 mph every minute after that. Using a regression equation running speeds were determined for each individual’s submaximal intensities. The desire was to have each individual complete 4 minutes on the treadmill at 50%, 65%, and 80% of VO2 max. One trial was completed by nasally and other orally. Oral breathing was significantly greater (p<.05) in all three intensities (50%, 65%, and 80%) in RR, VE, VO2/kg, VO2, and VCO2. Oral breathing creates greater respiratory rates and allows for greater volumes of air to be transferred to the lungs; combined with greater O2 consumption and CO2 expiration this breathing mode met the exercise demands more proficiently. With greater respiratory and metabolic demands met in oral breathing it provided the more suitable breathing mode for intensities greater than 50% VO2 max. Steady state did not seem to be reached in nasal breathing during the short 4 minute stages. There were beliefs that anaerobic contributions during the nasal breathing mode allowed for measures to create similar responses.


Aerobic exercises; Nasal breathing; Oral breathing; Respiration; Submaximal exercise; Ventilation


Exercise Science | Kinesiology | Medical Physiology | Medicine and Health Sciences | Physiology

File Format


Degree Grantor

University of Nevada, Las Vegas




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