Effect of Oral Versus Nasal Breathing on Muscular Performance, Muscle Oxygenation, and Post-Exercise Recovery.
Level 2 - randomized trial
Individual randomized counterbalanced crossover trial in humans
PubMed 41150503 · doi:10.3390/sports13100368
What was done
In a counterbalanced crossover study, 49 healthy young adults (24 females, 25 males; mean age 22.8 ± 3.4 years) performed two Wingate anaerobic tests using either nasal or oral breathing. The investigators measured mechanical power output, rating of perceived exertion (Borg scale), muscle desaturation and post-exercise recovery via near-infrared spectroscopy (NIRS), and endothelial function via flow-mediated dilation (FMD) as an indirect marker of nitric oxide bioavailability.
What was found
Breathing mode did not alter peak power (749 ± 290 W oral vs. 728 ± 284 W nasal) or average power output (576 ± 217 W oral vs. 575 ± 216 W nasal, p = 0.2), and muscle desaturation during exercise did not differ between conditions. Oral breathing caused higher perceived exertion than nasal breathing (Borg scale: 9.0 ± 1.1 vs. 8.0 ± 1.3, p = 0.04). Nasal breathing led to faster (0.45 ± 0.4 vs. 0.23 ± 0.12%/s, p = 0.02) and greater (75.2 ± 4.0 vs. 73.1 ± 3.6%, p = 0.04) post-exercise muscle recovery, as well as an increase in FMD (Pre: 107.4 ± 3.0% vs. Post: 110.3 ± 3.6%, p < 0.001) that differed significantly from oral breathing (p < 0.0001).
Why it matters
Nasal breathing during sprint-interval exertion preserves power output while lowering perceived exertion and accelerating acute muscle reoxygenation and vascular recovery.
Limits
The study was limited to 49 healthy young adults performing acute 30-second Wingate bouts, so findings cannot be directly applied to prolonged endurance performance or clinical populations. Direct plasma nitric oxide metabolites were not measured, and blinding was not possible given the nature of the intervention.
Cited by
- partial Nasal breathing increases oxygen delivery deeper into cells because of carbon dioxide restriction.