Nasal stripping isn't new. It's just had a massive resurgence, thanks to a certain Mr Nestor and his immaculate book 'Breath'. But let's be clear. This isn't a bull-kaka new TikTok wellness trend...
The evidence behind nasal strips is now peer-reviewed, tested under real exercise conditions, and reproducible. And the physiological reason your nose exists is genuinely more interesting than most people know.
Oh, and nasal stripping and nasal breathing LITERALLY changed my training & recovery...
So let's dive in...
What does nasal breathing do that mouth breathing cannot?
Suprise! Your nose is much more than just two holes. It's not some redundant sticky-outy thing that gets sunburnt. It's a separate & dedicated piece of equipment with four functions the mouth cannot replicate. Understanding this is the foundation for everything else.
The most important is nitric oxide. Your paranasal sinuses produce nitric oxide at concentrations in the thousands of parts per billion, several orders of magnitude higher than the lower airway. Air pulled through your nose carries roughly four to six times more nitric oxide than air pulled through your mouth. That NO inhales into the pulmonary circulation, binds to the heme group of soluble guanylate cyclase in vascular endothelium, triggers a cGMP cascade, and your blood vessels relax and dilate. In a nutshell = More oxygen is delivered to working muscles. Yet the mouth produces zero nitric oxide. When you breathe through your mouth, you rob yourself of this cascading process entirely.
Three other functions the mouth can't match: filtration (nasal mucosa traps over 90 percent of particles between 2 and 20 micrometres before they reach the lungs), air conditioning (nasal passages warm and humidify air to body temperature before it hits the alveoli), and pressure regulation (nasal exhalation creates slight back-pressure that holds alveoli open longer during gas exchange).
Now I'll admit, that's a lot of big words to say a simple thing. Try to think of it like this: Four functions. None replicable through the mouth. And yet most athletes default to mouth breathing the moment exercise gets hard, not because they have to, but because no one told them the cost.
What the 2025 research actually shows
In the 1990's a series of poorly constructed studies produced *suprise suprise* mixed results. The whole world said "See! Nasal strips are just a placebo". It's since taken a lengthy time to fund quality studies that 'prove' what we already know. In 2025, two studies looked at nasal breathing under exercise conditions, and I've got the scoop on both of them.
Lévénez et al. (Sports, October 2025) ran a controlled trial comparing nasal versus oral breathing during acute exhaustive exercise. They measured perceived exertion and muscle oxygenation during and after the session. Two headline findings: nasal breathing produced lower perceived exertion at matched output, and faster post-exercise muscle re-oxygenation. That second one is the training-relevant number. Faster muscle re-oxygenation between sets and intervals means higher work capacity per session. For an athlete chasing faster recovery, the effect compounds across every set, session, game and race.
Bergqvist et al. (Frontiers in Physiology, September 2025) tested oral, oronasal, and oronasal-with-decongested-nose breathing in twelve well-trained cyclists and triathletes (mean VO2max 67.2 ml/kg/min) during incremental maximal exercise. Time-to-exhaustion ran 2.8 percent longer under oronasal breathing and 4.2 percent longer with the nose decongested compared to oral-only. Directional advantage to the nasal route — but not statistically significant in twelve athletes. Capillary blood lactate was actually lower under oral-only breathing post-test, which the authors interpret as oral breathing reducing respiratory limitation at absolute maximal effort.
I'll be honest about what this means: nasal breathing is an efficiency and recovery intervention more than a raw VO2max intervention. Same ceiling, different curve getting there. Dont freak out! We are not arguing that the mouth is redundant... At genuine ceiling effort, the mouth still has a role. But below the ceiling (which is where most training happens) nasal breathing is consistently more efficient bro.
How big is the actual performance difference?
I want to be straight with you here, because most coverage isn't.
Long-term nasal-only protocols in trained runners (Dallam et al., Int J Kinesiology Sports Sci) show that after 8 to 12 weeks of nasal adaptation, athletes hit the same maximal oxygen uptake under nasal breathing as under oral breathing. The ceiling doesn't drop. But that's not the point. What improves is the breathing economy: the lower ventilatory equivalent for oxygen, lower respiratory rate at matched output, lower perceived exertion, improved flow-mediated dilation.
A structured nasal protocol typically produces measurable improvements in resting heart rate, HRV, recovery rate between intervals, and RPE at submaximal pace. Yes, we agree that headline VO2max changes are small and often confounded with concurrent training. Shocking I know!! But that's where too much confusion lies and it needs to be cleared up.
So, what nasal breathing during excercise is not: a free 5 percent VO2max boost. What nasal breathing during excercise is: a compounding efficiency advantage across volume, recovery, and sleep. Exactly the margin where elite endurance athletes win and lose.
How does nasal breathing change your sleep & recovery?
The on-session gains are visible in the data. The overnight gains are the ones most athletes miss.
Nasal breathing tends toward slower respiratory rate and longer exhalation, which biases the autonomic nervous system toward parasympathetic dominance. That shift is measurable in HRV (higher RMSSD) and resting heart rate after weeks of consistent practice. If you track via Whoop or Oura, you won't see a single-night spike, but trust me, you'll see a baseline trend over a few weeks as autonomic balance shifts.
There's also the respiratory load reduction. Mouth breathing during sleep delivers cold, harsh, dry air directly to the lower airway, keeping the body doing more work than it should be. Nasal breathing pre-conditions the air. For an athlete in a serious training block, that's the difference between a clean adaptation and one fighting low-grade respiratory inflammation the whole way through.
Sleep is the foundation. Honestly, eight hours of nasal breathing every night is significantly more valuable than perfect nasal breathing at a single session.
Understanding the nasal breathing adaption timeline
This is the honest piece most coverage skips, and it's why people quit too early.
Switching from habitual mouth breathing to nasal breathing is uncomfortable for the first six to eight weeks. CO2 tolerance recalibrates. Respiratory muscles adapt. The instinct to gasp through your mouth at moderate intensity has to be actively retrained.
The curve looks roughly like this: weeks one and two, nasal breathing feels effortful above resting pace. Training feels harder at the same heart rate. Week three is often when something clicks and the desire to switch to mouth breathing at moderate intensity fades noticeably, and nasal breathing during sleep starts to feel normal rather than forced. Weeks six to twelve, nasal capacity expands and tolerance for higher-intensity nasal work increases. Weeks twelve and beyond, nasal breathing is your default. Mouth breathing is the exception, reserved for ceiling work.
Most people who try this and quit do so between weeks four and six. Adaptation discomfort peaks before the gains land. Knowing the curve is half the protocol.
Why more & more elite athletes are nasal breathing with nasal strips
The clearest sign this has crossed from fringe to mainstream: the 2025 Tour de France.
Jonas Vingegaard, Remco Evenepoel, Sepp Kuss, Mattias Skjelmose, Julian Alaphilippe were all racing with nasal strips across the three-week tour. Riders from Lidl-Trek, Visma–Lease a Bike, and UAE Emirates XRG on strips through every grand tour of the season. Carlos Alcaraz and Casper Ruud in tennis. Sofia Goggia in skiing. HYROX competitors wearing strips into the eight-station format at Manchester, London, Dubai, and Hamburg because nasal breathing during run-station transitions is where the seconds compound.
Let me reiterate, this is not trend-chasing. This is the world finally waking up. The science supports an efficiency advantage and a recovery advantage, which is precisely why endurance and hybrid sport is leading the adoption. Athletes operating at the margins of their physiology can feel the difference.
The problem is that pharmacy positioning of nasal strips, the snoring-aisle inheritance from a 1991, has obscured the performance use case for thirty years. But it's not too late...
How to run your own 12-week nasal breathing protocol
The application is simple. The discipline is in the consistency.
Sleep. Non-negotiable. Nasal breathing during sleep is the foundation. A nasal strip mechanically removes the most common barrier, nasal valve collapse at rest (this was my biggest problem). Use one every night. Eight hours of compounding nitric oxide exposure, autonomic recovery, and reduced respiratory inflammation. If only one part of this protocol sticks, make it this one. (Trust me bro)
Nasal-only warm-up and cool-down. All low-intensity work: easy runs, mobility, recovery cycling. This is where nasal capacity expands without compromising high-intensity output.
Make moderate-intensity training nasal-default. Zone 2, easy lifting, technical drills. Use nasal breathing as the default; with mouth breathing reserved for genuine ceiling efforts. Most athletes switch to mouth breathing well below their nasal ceiling out of habit, not necessity.
Oral breathing only at high intensit. At true maximal effort, oronasal or oral breathing becomes mechanically necessary for most people. The goal is a high-capacity nasal default that holds longer before the switch, not pure nasal breathing at all intensities.
Before you start, baseline your metrics today: VO2max estimate, 7-day HRV average, 7-day resting heart rate. Run the protocol for 12 weeks. Retest under the same conditions. Get back to me with your results.
The gain will be modest if you're already a strong nasal breather. It'll be substantial if you've been a habitual mouth breather your whole life. Either way, it's measurable, and the cost of the protocol is the price of nightly strips and six weeks of discomfort before it clicks.
Enjoy better breathing!
Sources:
• Lévénez M et al. Effect of Oral Versus Nasal Breathing on Muscular Performance, Muscle Oxygenation, and Post-Exercise Recovery. Sports. 2025;13(10):368 (PMID 41150503).
• Bergqvist J et al. Effects of oral, oronasal, and oronasal breathing with a decongested nose during incremental maximal exercise testing of well-trained endurance athletes. Front Physiol. 2025;16:1654725 (PMC12504478). Both open access.
