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NASAL DILATORS DO NOT ENHANCE PERFORMANCE DURING EXERCISE
Study indicates that work of breathing not reduced
The team of researchers, led by Joseph A. O'Kroy, Ph.D., Florida Atlantic University, noted that the existing research had measured such metabolic variables as VO2max, maximal power output, maximal ventilation, maximal heart rate and anaerobic threshold. "We knew that most people breathe through both mouth and nose during exercise, and that an average of 27 to 40 percent of the total is through the nose," said O'Kroy. "We decided to measure the actual work of the respiratory muscles during exercise, intending to learn whether wearing a nasal dilator reduced that work." Fourteen individuals (11 women, three men) between the ages of 20 and 29, participated in this study. All were screened for heart or pulmonary disease, hypertension, asthma, or any medication or musculoskeletal abnormalities that would preclude exercise. |
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Two one-hour
visits to the exercise physiology lab consisted of a pulmonary
function test and a measurement procedure that included swallowing
an esophageal balloon to measure the work of breathing, which
includes the elastic work respiratory muscles must perform to
overcome the elasticity of lung tissue, chest wall recoil and
resistance to airflow. The exercise protocol consisted of single-blind, random order testing, with active and placebo nasal dilators in place. Subjects were asked to breathe normally, making no conscious decision between oral and oronasal (both mouth and nose) breathing. The subjects rested for two minutes, then pedaled with a resistance of 30 watts (men) and 20 watts (women). The work rate was increased 30 watts a minute for men and 20 watts a minute for the women participants, and each person pedaled to their own perception of being exhausted. O'Kroy and the team of researchers found no significant differences between the placebo and the active nasal dilator regarding the total work of breathing.
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They also measured
metabolic variables at submaximal and peak exercise levels, and concluded
that the application of a nasal dilator did not result in any significant
alteration in VO2max, maximal power output, maximal ventilation or maximal
heart rate.
The external nasal dilator works by increasing the area of the nasal
passages, therefore decreasing resistance to airflow during nasal breathing.
It does not alter the resistive components of the total work of breathing by
the respiratory muscles, so there is no mechanism to redirect energy to the
locomotor muscles and increase performance. Stating that other applications
of the nasal dilator merit further study, O'Kroy and the team of researchers
referred specifically to work on measuring overall body ratings of perceived
exertion.
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