Medicine Poster Session
Popular use of the Breathe Right Nasal Strip during exercise situations has lead to the assumption that they provide performancing enhancing effects. Nasal contibution to exercise ventilation does shift with work intensity although there is considerable variability among subjects. If performance were to be effected, ventilation and or oxygen consumption alterations should be evident during Breathe Right trials. A further potential postive exercise reponse could be related to Exercise Induced Asthma. Since nasal breathing, due to its superior air conditioning abilities, has been shown to reduce EIA response then the Breathe Right Strip may show a positive contribution.
Materials and Methods
Series 1 : 24 subjects (16-24yrs) These subjects completed a standard graded bicycle ergometer test from rest to exhaustion. Three min. at each 50 watt load and from 5 to 7 levels. They breathed through a modified Hans Rudolph mask. Attached to both the Nasal port and the Oral port were Aerosport TEEM 100 Pneumotack heads for flow and metabolic calculations. This allowed for independent measurements of both oral and nasal contibution to the work. They completed the protocol on three separate occasions : control ( no nasal strip), Placebo ( Nasal strip with no elastic device), Breathe Right Nasal Strip. Series II : 12 EIA subjects (12-26 yrs) These subjects completed a 6 min treadmill run at 80% max once on placebo and once with Breathe Right Strip. No mask was worn. Pulmonary function analysis was performed : three times at rest, immediately after exercise, and at 3,6,9,12,15 mins. of recovery. % fall index was calculated using FEV1 and MEF50. For both series repeated measures ANOVA was used to indentify significance at the (.05) level between conditions.
SERIES I : c- control, P- Placebo, B- Breathe Right (* sig at .05)
Total Ventilation % Oral Vent % Nasal Vent C P B C P B C P B 70%max Mean 31 32 33 82 81 77 18 19 23 SE 2.0 2.9 1.6 9.8 8.1 8.4 4.7 1.6 1.9 80%max Mean 46 54 48 83 81 72* 17 19 28* SE 2.9 4.4 2.4 8.6 8.4 7.4 3.6 1.8 2.0Data for VO2 showed a similar trend with a significant increase during Breathe Right trials for % Nasal contribution indentified at the moderately heavy loads. Series II : No significant effects were identified in pulmonary function responses across conditions. However 5 of the 12 subjects did show a reduced EIA response ( reduced %fall index during Breathe Right trials). Reductions ranged from 4% to 20 %.
Discussion and Conclusion
The data show that no overall effect on ventilation nor VO2 was identified for Breathe Right trials. This finding and other pilot performance work we have completed would suggest that the nasal strips have no effect on exercise performance in healthy individuals. There is however a shift toward a greater % nasal contribution to both the ventilation and VO2 across work intensities, becoming significant at moderate to heavy loads. From a strictly mechanical viewpoint this shift would probalbly increase the work of breathing but may provide a slightly higher alveolar ventilation for the same total ventilation. Although this shift would be of minor importance in normal subjects, because air conditioning is a modifing factor for EIA patients, even a small improvement here may reduce their response. Increased conditioning of inspired air as well as forced nasal ventilation has been shown to improve EIA exercise tolerance. A small group of our EIA patients did improve their exercise response. This work is currently being expanded to include a larger group of EIA subjects. In terms of compliance during free exercise trials our children consider it an "in thing to do" wearing the nasal strip like pro atheletes, while use of an inhaler is embarrassing to some.
Butler J. The work of breathing through the nose. Clin Sci 19:55-62,1960.
Strohl KP., et al. The nasal response to exercise and exercise induced bronchoconstriction in normal and asthmatic subjects. Thorax 43:890-5,1988.
Wilson BA., O. Bar-Or, and LG. Seed. Effects of humid air breathing during arm or treadmill exercise on exercise-induced bronchoconstriction and refractoriness. Am Rev Respir Dis 142:349-52,1990.
| Discussion Board | Previous Page | Your Poster Session |
|Wilson, B A; (1998). The Effects of Breathe Right Nasal Strip On Ventilation During Exercise and Subsequent Exercise Induced Asthma. Presented at INABIS '98 - 5th Internet World Congress on Biomedical Sciences at McMaster University, Canada, Dec 7-16th. Available at URL http://www.mcmaster.ca/inabis98/medicine/wilson0196/index.html|
|© 1998 Author(s) Hold Copyright|