@article{Hostetter_Steven R. McClaran_Cox_Dallam_2016, title={Triathlete Adapts to Breathing Restricted to the Nasal Passage Without loss in VO2max or vVO2max}, volume={4}, url={https://jhp-ojs-tamucc.tdl.org/JHP/article/view/70}, DOI={10.12922/jshp.v4i1.70}, abstractNote={<p>This case study investigated the effect of restricting breathing to the nasopharynx versus the oropharynx on the ability to perform maximal and high level steady state running in a highly trained triathlete who previously adapted himself to nasal only breathing during exercise as a means of inhibiting exercise-induced bronchospasm (EIB).    <strong><em>  </em></strong>The subject was tested using a maximal graded treadmill protocol (GXT) to voluntary exhaustion followed 10 minutes later by a 6 minute steady state treadmill protocol (SS) at 85% of the previously achieved maximal velocity in both breathing conditions.  Oxygen uptake was measured via indirect calorimetry and 1 second forced expiratory volumes (FEV<sub>1</sub>) were measured with spirometry.<strong><em>  </em></strong><sub> </sub> In the GXT trials the subject produced a time to exhaustion (TE) of 6:24,  a maximal oxygen consumption (VO2<sub>max</sub>) of 3.92 L/min. and a velocity at VO2<sub>max</sub> (<sub>V</sub>VO<sub>2max</sub>) of 9.7 mph while breathing only through the nasopharynx (NB).   While breathing  only through the oropharynx (OB) he produced a  TE of 6:15,  a VO2<sub>max</sub> of 3.80 L/min. and a <sub>V</sub>VO<sub>2max</sub> of 9.7 mph..  During the 6 minute SS trials running at 8.0 mph, his mean oxygen consumption was 4.16 L/min. in NB and 3.99 L/min. in OB.  The subject experienced a 17% reduction in FEV<sub>1</sub> (Pre = 5.03 L/sec., Post = 4.17 L/sec.) following the OB GXT not seen following the NB GXT. <strong><em>  </em></strong>This case study confirms the ability of a highly trained competitive triathlete to adapt to breathing restricted to the nasopharynx during running at both a maximal effort and a subsequent high level steady state effort without a loss in performance or peak aerobic capacity, as a means of inhibiting EIB. </p>}, number={1}, journal={Journal of Sport and Human Performance}, author={Hostetter, Karen and Steven R. McClaran, Steven R and Cox, Daniel G and Dallam, George M}, year={2016}, month={Apr.} }