Breathing for Cycling Performance: Mind, Body, and Sport

How you breathe affects how you ride. Nasal breathing, breathing pattern, respiratory muscle strength, breath hold training, and how you respond to breathlessness all influence how economical your breathing is, how hard efforts feel, and how well you recover. Breathing is one part of cycling performance, alongside fitness, pacing, nutrition and sleep.

This guide covers the three pillars of the Oxygen Advantage method as they apply to cycling: Body, Sport, and Mind.

The Three Pillars of Oxygen Advantage

Oxygen Advantage is built on three interconnected pillars:

• Body: Functional and biomechanical breathing for health, efficiency, and energy.
• Sport: Integrating advanced breathing strategies into training and racing to support performance and recovery.
• Mind: Breathwork to enhance focus, resilience, and flow state.

Body: Functional Breathing for Cyclists

The BOLT Score and Dysfunctional Breathing

The Body Oxygen Level Test (BOLT) is a simple breath-hold test. It measures how quickly you feel the first clear urge to breathe during a comfortable breath hold after a normal exhalation. The score is influenced by several factors, including chemical sensitivity, starting blood gases, breathing pattern, respiratory sensation, lung volume and psychological state.

In a screening study, a breath-hold time of 25 seconds or more was associated with a high likelihood of functional breathing, while shorter times were more common in people with dysfunctional breathing. On its own, however, breath-hold time missed many cases. The researchers found it worked best when combined with a short symptom questionnaire and breathing pattern assessment (Kiesel et al., 2017).

BOLT is useful feedback, not a diagnosis, and it does not predict athletic performance. A 2024 study using the Oxygen Advantage BOLT protocol in 49 highly trained speed skaters found no relationship between BOLT and VO2max or anaerobic test performance (Kowalski et al., 2024).

Dysfunctional breathing has been linked to:

• Disproportionate breathlessness during exercise
• Poor core stability and lower back pain
• Dysfunctional movement patterns, which may matter for cyclists given the aerodynamic, forward-flexed posture on the bike (Bradley and Esformes, 2014)

Dysfunctional breathing can include habitual over-breathing at rest and excessive use of the upper-chest accessory muscles. Breathing more than the body needs at rest lowers carbon dioxide and can cause respiratory alkalosis.

These links are associations. They suggest breathing pattern is worth assessing alongside movement, but they do not show that breathing is the single cause of movement problems.

Biochemical Dimension: CO2, Air Hunger, and Breathlessness

Breathing is generated by the nervous system and regulated by several interacting inputs. During exercise, these include signals from the brain's motor areas (central command), feedback from working muscles, metabolic CO2 production, and chemical feedback from CO2, oxygen and pH (Dempsey and McCrimmon, 2026). CO2 chemoreception is a powerful feedback regulator of breathing, but it is not the only driver.

• Breath-hold time and breathlessness: Breath-hold time is shorter after exercise, and the sensation of breathlessness rises with effort (Craig and Cain, 1957). During a breath hold, rising CO2 is an important contributor to the urge to breathe.
• Training your response to air hunger: Breath-hold exercises and nasal breathing expose you to air hunger in a controlled way. Over time, many people find they can stay calmer and breathe more steadily as the urge to breathe builds. How much of this reflects changes in chemical sensitivity, perception, breathing behavior or a combination is still uncertain.
• Fitness and CO2 sensitivity: Athletes do not necessarily have lower CO2 sensitivity. One study found endurance athletes and sedentary people had similar sensitivity to CO2, but athletes appeared to use additional strategies during exercise to reduce its influence on their breathing and perceptions (Harrison et al., 2022). Athletes with a higher VO2 max may therefore differ more in how they manage breathing sensations than in their chemistry.

Biomechanical Dimension: Diaphragm Strength and Breathing Patterns

Efficient breathing relies on strong, well-coordinated use of the diaphragm. Nasal breathing adds resistance to airflow and encourages diaphragmatic recruitment and less reliance on the upper-chest accessory muscles. For cyclists, this matters given the forward-flexed position and the need for core stability.

• Respiratory muscle endurance training: In fit young cyclists, training the endurance of the breathing muscles with repeated high-volume breathing improved respiratory muscle endurance and cycling time-trial performance (Holm et al., 2004).
• Inspiratory muscle training: Devices like the SportsMask or inspiratory muscle trainers add resistance to breathing, which can help strengthen the diaphragm and respiratory muscles and may support endurance.
• Diaphragm fatigue: During heavy, sustained efforts, the diaphragm can fatigue. Fatiguing respiratory muscles can trigger a reflex that reduces blood flow to the legs, contributing to leg fatigue, breathlessness and reduced performance (Boyle et al., 2020; Sheel et al., 2018; Vogiatzis et al., 2008).

The Importance of Nasal Breathing During Cycling

Most cyclists do not consciously consider their breathing route. Many breathe through an open mouth even at low intensity, missing out on the benefits of nasal breathing.

Functional breathing is breathing that is appropriate to the situation: quiet and economical at rest and during easy riding, and large enough to meet metabolic demand during hard efforts. Nasal breathing is a useful tool at low to moderate intensities. At maximal effort, mouth breathing is normal and necessary.

Why Nasal Breathing Matters for Cyclists

• Breathing Economy: In a 2018 study, Dallam and colleagues tested ten recreational runners who had breathed only through the nose during all training for at least six months (Dallam et al., 2018). Compared with mouth breathing, nasal breathing during a maximal test produced lower breathing rates and lower ventilation.
  • At maximal effort, breathing rate was 39.2 breaths per minute with nasal breathing, compared with 49.4 with mouth breathing.
  • End-tidal CO2 was higher with nasal breathing, and less air was breathed for each unit of oxygen used.
  • VO2max was not significantly different between conditions, although it was around 7% lower with nasal breathing. This was a small study in runners, so results may not transfer directly to cyclists.
• Intensity Matters: In a 2025 study of healthy adults who were not adapted to nasal breathing, exclusive nasal breathing had little effect at rest and submaximal intensities, but reduced peak ventilation, peak oxygen uptake and peak workload during a maximal cycling test (Mapelli et al., 2025). Use nasal breathing as a training constraint at suitable intensities, not a rule for every effort.
• Breathing Pattern and Dead Space: For the same amount of air per minute, slower and deeper breaths mean a smaller share of each breath is spent filling the airways (dead space), so a larger share reaches the alveoli where gas exchange happens (Dominelli and Sheel, 2024; Petersson and Glenny, 2014; Stickland et al., 2013).
• CO2 and the Bohr Effect: At low to moderate intensities, nasal breathing can slow the breathing rate and raise end-tidal CO2 slightly (Dallam et al., 2018). CO2 and acidity help hemoglobin release oxygen to the tissues (the Bohr effect). This is one part of oxygen delivery, which also depends on cardiac output, blood oxygen content, blood flow and how much oxygen the muscles extract. Higher CO2 does not on its own increase whole-body oxygen uptake: in the 2025 study above, exclusive nasal breathing raised end-tidal CO2 at peak effort while peak oxygen uptake fell (Mapelli et al., 2025).
• Water Loss: Mouth breathing increases water loss from the airways. One study found net water loss was 42% higher with oral than nasal exhalation in healthy people at rest (Svensson et al., 2006). Breathing dry air through the mouth may also contribute to airway dryness and irritation (Edwards and Chung, 2023).
• Airway Protection: The nose filters, humidifies, and warms air before it reaches the lungs. In people with asthma, breathing through the nose during exercise markedly reduced exercise-induced bronchoconstriction compared with mouth breathing (Shturman-Ellstein et al., 1978). This may help cyclists prone to airway irritation or coughing after hard or cold rides.
• Nitric Oxide and Blood Pressure: The nasal airways produce nitric oxide, which is carried into the lungs during nasal breathing and plays a role in airway and blood vessel function (Lundberg and Weitzberg, 1999). One study found that acute nasal breathing lowered diastolic blood pressure compared with mouth breathing (Watso et al., 2023). You can read more about the 30 functions of the nose and why nasal breathing matters beyond just filtering air.
• Cardiac Health in Endurance Athletes: A theoretical review has proposed that nasal breathing during exercise could help protect endurance athletes against cardiac fibrosis and arrhythmia, partly through effects on CO2 and coronary blood flow (Raphael et al., 2024). This is a hypothesis that has not yet been tested in trials.

Alveolar Ventilation, Gas Exchange, and Circulation in Cycling

• Alveolar Ventilation: Not all inhaled air reaches the alveoli, where gas exchange occurs. Some remains in the dead space of the nose, trachea and bronchi. For a given minute ventilation, slower, deeper breaths reduce the proportion of each breath lost to dead space (Dominelli and Sheel, 2024; Stickland et al., 2013).
• Gas Exchange: Oxygen moves from the alveoli into the bloodstream by passive diffusion, while carbon dioxide moves out. Efficient gas exchange depends on matching ventilation (airflow) to perfusion (blood flow) in the lungs. Well-ventilated alveoli that are also well-perfused allow for optimal gas exchange (Petersson and Glenny, 2014).
• Ventilation-Perfusion Matching: During exercise, both ventilation and blood flow increase. Your body recruits more capillaries in the lungs and redistributes blood so that more of the lung is used for gas exchange. This helps maintain blood oxygen levels as demands rise (Dominelli and Sheel, 2024)
• Circulation and Oxygen Delivery: Once oxygen enters your blood, it binds to hemoglobin in red blood cells and is pumped by the heart to your working muscles. How much oxygen the muscles receive and use depends on cardiac output, muscle blood flow and oxygen extraction (Kalliokoski et al., 2005).
• Blood Vessel Adaptation: With exercise, blood vessels in the lungs dilate and previously closed capillaries are recruited to accommodate increased blood flow, increasing the surface area available for gas exchange (Stickland et al., 2013).

How to Breathe While Cycling: Nose, Light, Slow, Deep (NLSD)

• Nose: Breathe in and out through your nose at rest and during low to moderate intensity riding. Switch to mouth breathing when the effort requires it.
• Light: Reduce unnecessary ventilation when demand is low. Minute ventilation depends on both breathing rate and the size of each breath (MV = RR x TV). Slowing your rate while taking bigger breaths can leave total ventilation unchanged or higher. Slow isn't the goal. Light is.
• Slow: Maintain a slow, controlled breathing rate when the intensity allows, keeping each breath soft rather than big.
• Deep: Direct each breath low by engaging your diaphragm and lower ribs, not just your upper chest. You don't have to breathe big to breathe deep.

By breathing nose, light, slow, and deep when the intensity allows, you can:

• Reduce the share of each breath lost to dead space
• Avoid breathing more than you need at rest and during easy riding
• Improve awareness and control of your breathing pattern
• Reduce airway drying and irritation
• Support a calmer nervous system during training and recovery

In summary: At rest and low to moderate intensities, breathing no more than you need reduces unnecessary work for the breathing muscles and helps you stay calm and in control. During heavy efforts, breathing needs to be large enough to meet demand, and heavy respiratory muscle work can compete with the legs for blood flow. Training breathing pattern and respiratory muscle function helps you breathe appropriately across both situations (Kalliokoski et al., 2005; Petersson and Glenny, 2014; Stickland et al., 2013).

Sport: Breath Hold Training, Hypoxic Adaptation, and Sprinting

For 23 years, Patrick McKeown has trained athletes in nasal breathing, mind, and functional breathing, but also in the use of stressor exercises involving breath holds after exhalation. These are performed during movement and are sometimes called dynamic apnea or hypoventilation training.

They are fundamentally different from breath holds performed in other breathing techniques, such as the Wim Hof Method, which involve a period of hyperventilation followed by breath holding. The Oxygen Advantage breath hold exercises are designed to lower oxygen and increase carbon dioxide at the same time, creating a potent training stimulus.

What Is Involved in Dynamic Breath Holds for Cyclists?

During a dynamic breath hold:

• CO2 levels rise and O2 levels fall: By holding the breath after a normal, relaxed exhalation (not after a deep breath in), you quickly create a controlled state of air hunger. This causes an increase in blood carbon dioxide (CO2) and a drop in blood oxygen saturation (O2).
• Trains your response to air hunger: Repeated, controlled exposure to strong air hunger may change how you perceive and respond to the urge to breathe, helping you stay calm and avoid over-breathing under stress. It is less clear how much it changes chemoreceptor sensitivity to CO2.
• Possible physiological adaptations:
  • Breathing less often during exercise has been shown to delay the appearance of lactate in the blood (Yamamoto et al., 1988). How breath-hold training affects buffering capacity is still being studied.
  • Researchers are investigating whether repeated breath holds can produce adaptations similar to high-altitude training, such as increased red blood cell production. The evidence so far is mixed (Bouten et al., 2024).
  • In breath-hold divers, training was associated with lower oxidative stress and blood acidosis after static and dynamic apnea (Joulia et al., 2003).
• Performance benefits: With repeated practice, many athletes find they can maintain a calmer, more controlled breathing pattern under intense effort and tolerate breathlessness better. Effects on aerobic and anaerobic performance vary between studies and individuals.

Key points:

• Exhale-hold breath holds are not a test of willpower or a competition, but a targeted training tool to induce controlled hypoxia and hypercapnia.
• The length of each breath hold is guided by the strength of your air hunger, not by a fixed time.
• Over time, this practice can change how you respond to breath holding and air hunger, and support better day-to-day breathing patterns.
• Strong breath holds are not suitable for everyone. Avoid them if you have heart disease, high or low blood pressure, epilepsy, diabetes, pulmonary hypertension, uncontrolled asthma, a history of fainting, or another serious medical condition, or if you are pregnant, unless cleared by your doctor. Never practice them in or under water.

Stopping ventilation has been shown to initiate the diving response both at rest and during exercise (Lin, 1988; Lindholm et al., 1999; Lindholm and Lundgren, 2009). Apnea alone during physical exercise is sufficient to trigger the diving response, and it can be modulated by immersion, water temperature, hypoxia, physical activity, and training.

Sprint Training and Repeated Sprint Ability for Cyclists

Sprinting is a cornerstone of cycling performance, whether in breakaways, final sprints, or repeated surges during races. Research suggests that repeated sprint ability can be enhanced by combining sprints with breath holds, specifically repeated-sprint training in hypoxia induced by voluntary hypoventilation at low lung volume (RSH-VHL).

• Severe Hypoxemia: Exhaling down to low lung volume before holding the breath during exercise can cause a substantial fall in arterial oxygen saturation (Woorons et al., 2007).
• Transfer Between Sports: Cycle-based hypoventilation training has been shown to benefit run-based performance in team-sport athletes, suggesting the adaptations are not limited to the training mode (Woorons et al., 2020).
• Meta-analysis Support: A 2025 meta-analysis of 10 studies found that RSH-VHL improved fatigue resistance during repeated sprints (a smaller drop-off in performance) and increased maximal blood lactate compared with the same training with normal breathing. It did not improve best or mean sprint performance, and the mechanisms are not yet clear (Précart et al., 2025).
• Protocol: Involves exhaling down to functional residual capacity, then holding the breath over an entire all-out sprint (typically 8 seconds or less), followed by normal breathing during recovery.

Recovery and Sleep: The Overlooked Pillar for Cyclists

Sleep is a critical pillar of recovery for cyclists. Research shows that restricting sleep after heavy exercise can impair subsequent cycling performance and recovery, and that chronic sleep loss can reduce endurance performance.

Cycling-Specific Evidence:

• A 2023 study found that restricting sleep between consecutive days of exercise significantly reduced mean power output during both sprint and endurance cycling tests, and lowered feelings of wellness and mood (Dean et al., 2023).
• Bicycling magazine has summarized research showing that extending sleep can improve cycling endurance performance, while restricting it can impair time-trial performance (Yeager, 2019).
• In a study of 112 high-level cyclists, 41% of both elite and junior riders showed poor sleep quality (Javaloyes et al., 2024).

Professional Cyclists and Stage Races:

• Reporting on data from the Tour de France suggests that professional cyclists often struggle to get enough restorative sleep during stage races. While total sleep time may not drop dramatically, sleep efficiency and REM sleep can decrease, and heart rate variability can decline over consecutive days of racing (de Neef, M., 2024).

General Athletic Performance:

• Sleep deprivation slows reaction time, decreases concentration, and impairs motor coordination, which may raise the risk of accidents and injuries (Taheri and Arabameri, 2012).
• Lack of sleep also negatively affects anaerobic endurance and speed (Kong et al., 2025), along with recovery from physical exertion, which can mean longer recovery times, poorer performance in stage races, and greater susceptibility to injuries (Charest and Grandner, 2020).

Magnitude of Impact:

• Cycling coaches and media increasingly highlight sleep as one of the most important, and most overlooked, performance factors (Billyard, 2023).
• Likely reasons include better muscle recovery, hormonal regulation, cognitive function, and mood.

Key Takeaway: Prioritizing sleep alongside breath training should be a cornerstone of every cyclist's recovery strategy. Even modest improvements in sleep quality and duration can support performance, wellness, and resilience.

• In awake adults, acute nasal breathing increased parasympathetic contributions to heart rate variability compared with mouth breathing (Watso et al., 2023). Maintaining nasal breathing at night may similarly support calmer, more stable breathing during sleep.
• MyoTape and nasal dilators can help support nasal breathing during sleep.
• The ability to downregulate the body and mind before bed, activating the rest-and-digest response, can help you fall asleep more easily and wake up more alert.

Mind: Focus, Flow, and Mental Performance for Cyclists

Breath training is not just physical. It is also psychological. The Mind pillar of Oxygen Advantage emphasizes the role of breath in regulating focus, attention, and emotional resilience.

• Nasal and slow breathing can shift the nervous system toward parasympathetic activity, help reduce anxiety, and support entry into flow states, where attention is fully devoted to the task.
• How you perceive breathlessness also shapes how hard an effort feels. Respiratory sensations are processed by the brain, and attention and emotion can amplify or reduce them.
• Mental resilience is essential for cyclists, who must maintain concentration and composure under fatigue and stress.

Practical Steps for Cyclists

• Assess your BOLT score: Begin by measuring your BOLT score, a simple breath-hold test after a normal exhalation. Use it as a personal baseline and track your own progress over time, alongside how your breathing feels during rides. A score under 25 seconds is worth paying attention to, especially if you also notice breathlessness, upper-chest breathing or frequent mouth breathing.
• Adapt to nasal breathing: Transition gradually by starting with nasal breathing during low-intensity rides, warm-ups, and cool-downs. If you experience nasal congestion or narrow airways, use nasal dilators to improve airflow. As nasal breathing becomes comfortable, progressively increase the intensity and duration, and switch to mouth breathing when the effort requires it.
• Incorporate breath holds: If breath holds are suitable for you, practice post-exhale breath holds (dynamic apnea) during warm-ups, low-intensity sessions, and sprint intervals. These expose you to higher CO2, lower oxygen and stronger air hunger. Over time, many athletes find they stay calmer as breathlessness builds and cope better with repeated high-intensity efforts.
• Train the diaphragm: Practice slow, soft nasal breathing with good diaphragm and lower-rib movement. This supports breathing efficiency and control, which complements your aerobic capacity training. Consider using the SportsMask to add resistance and further strengthen your respiratory muscles.
• Prioritize sleep and recovery: Use MyoTape or nasal dilators to support nasal breathing during sleep. After training, practice slow, nasal, diaphragmatic breathing to shift toward the rest-and-digest response and support recovery.
• Focus on the mind: Incorporate breathwork and mindfulness techniques to train your ability to sustain attention and manage stress. Breathing can help you handle pressure in sports. This mental training, combined with better sleep and breathing control, helps you enter flow states and maintain composure during rides and races.

Working on breathing pattern, respiratory muscle function, your response to air hunger, and sleep gives you a more complete approach than focusing on any single factor. Together, they can support calmer breathing, less breathlessness at a given effort, and a more focused mind on the bike.

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The Oxygen Advantage Method for Cyclists

The Oxygen Advantage method is a science-based breathing system developed by Patrick McKeown over more than 20 years of working with endurance athletes, including cyclists at all levels.

It trains breathing regulation and adaptability across three dimensions: biomechanical (how the diaphragm, ribs and airway move), biochemical (matching breathing to what the body needs) and psychophysiological (how you perceive and respond to breathing sensations). The aim is breathing that is quiet and economical at rest, appropriate during effort, and adaptable under stress.

For cyclists specifically, the method addresses the three pillars covered in this guide. It improves breathing economy and control through nasal breathing adaptation. It trains the breathing muscles and your response to air hunger through resistance breathing and dynamic breath hold training. And it supports mental resilience, focus, and sleep quality through breathwork and nervous system regulation.

If you are interested in trying the OA method for yourself, why not try our online breathing course, become a certified breathwork instructor, or find an Oxygen Advantage instructor near you.

References

Billyard, J. (2023). Here's what a lack of sleep does to your cycling performance. Cycling Weekly.

Boyle, K. G., et al. (2020). The effect of diaphragm fatigue on the multidimensional components of dyspnoea. The Journal of Physiology, 598(15), 3223-3237.

Bouten, J., et al. (2024). Apnoea as a novel method to improve exercise performance. Experimental Physiology.

Bradley, H., and Esformes, J. (2014). Breathing pattern disorders and functional movement. International Journal of Sports Physical Therapy.

Charest, J., and Grandner, M. A. (2020). Sleep and Athletic Performance. Sleep Medicine Clinics, 15(1), 41-57.

Craig, F. N., and Cain, S. M. (1957). Breath holding after exercise. Journal of Applied Physiology, 10(1), 19-25.

Dallam, G. M., et al. (2018). Effect of nasal versus oral breathing on VO2max and physiological economy in recreational runners. International Journal of Kinesiology and Sports Science, 6(2), 22-29.

de Neef, M. (2024). How much sleep do Tour de France riders get? Escape Collective.

Dean, B., et al. (2023). Sleep restriction between consecutive days of exercise impairs sprint and endurance cycling performance. Journal of Sleep Research, 32(5), e13857.

Dempsey, J. A., and McCrimmon, D. R. (2026). V̇CO2: the essential underpinning to homeostatic control of breathing. American Journal of Physiology: Lung Cellular and Molecular Physiology, 331, L34-L47.

Dominelli, P. B., and Sheel, A. W. (2024). The pulmonary physiology of exercise. Advances in Physiology Education, 48(2), 238-251.

Edwards, D. A., and Chung, K. F. (2023). Mouth breathing, dry air, and low water permeation promote inflammation. QRB Discovery, 4, e3.

Harrison, O. K., Russell, B. R., and Pattinson, K. T. S. (2022). Perceptual and ventilatory responses to hypercapnia in athletes and sedentary individuals. Frontiers in Physiology, 13, 820307.

Holm, P., Sattler, A., and Fregosi, R. F. (2004). Endurance training of respiratory muscles improves cycling performance in fit young cyclists. BMC Physiology, 4, 9.

Javaloyes, A., et al. (2024). Assessing sleep quality in elite and junior cyclists. Frontiers in Sports and Active Living, 6, 1369435.

Joulia, F., et al. (2003). Breath-hold training of humans reduces oxidative stress and blood acidosis after static and dynamic apnea. Respiratory Physiology and Neurobiology, 137(1), 19-27.

Kalliokoski, K. K., et al. (2005). Relationship between muscle blood flow and oxygen uptake during exercise. Journal of Applied Physiology, 98(1), 380-383.

Kiesel, K., et al. (2017). Development of a Screening Protocol to Identify Individuals with Dysfunctional Breathing. International Journal of Sports Physical Therapy, 12(5), 774-786.

Kong, Y., et al. (2025). Effects of sleep deprivation on sports performance and perceived exertion. Frontiers in Physiology, 16, 1544286.

Kowalski, T., Rębiś, K., Wilk, A., et al. (2024). Body Oxygen Level Test (BOLT) is not associated with exercise performance in highly-trained individuals. Frontiers in Physiology, 15, 1430837.

Lin, Y. C. (1988). Applied physiology of diving. Sports Medicine, 5(1), 41-56.

Lindholm, P., and Lundgren, C. E. (2009). The physiology and pathophysiology of human breath-hold diving. Journal of Applied Physiology, 106(1), 284-292.

Lindholm, P., et al. (1999). Oxygen-conserving effects of apnea in exercising men. Journal of Applied Physiology, 87(6), 2122-2127.

Lundberg, J. O., and Weitzberg, E. (1999). Nasal nitric oxide in man. Thorax, 54(10), 947-952.

Mapelli, M., et al. (2025). Nasal vs. oral BREATHing WIn Strategies in healthy individuals during cardiorespiratory Exercise testing (BreathWISE). PLoS One, 20(7), e0326661.

Oxygen Advantage. What is a breathing pattern disorder?

Petersson, J., and Glenny, R. W. (2014). Gas exchange and ventilation-perfusion relationships in the lung. European Respiratory Journal, 44(4), 1023-1041.

Précart, C., et al. (2025). Repeated-Sprint Training in Hypoxia Induced by Voluntary Hypoventilation at Low Lung Volume: A Meta-analysis. Sports Medicine Open, 11(1), 55.

Raphael, K., et al. (2024). Could Nasal Breathing During Exercise Inhibit the Development of Cardiac Fibrosis and Arrhythmia? International Journal of Physical Education, Fitness and Sports, 13(4), 10-20.

Sheel, A. W., et al. (2018). Competition for blood flow distribution between respiratory and locomotor muscles. Journal of Applied Physiology, 125(3), 820-831.

Shturman-Ellstein, R., Zeballos, R. J., Buckley, J. M., and Souhrada, J. F. (1978). The beneficial effect of nasal breathing on exercise-induced bronchoconstriction. American Review of Respiratory Disease, 118(1), 65-73.

Stickland, M. K., et al. (2013). Pulmonary gas exchange and acid-base balance during exercise. Comprehensive Physiology, 3(2), 693-739.

Svensson, S., et al. (2006). Increased net water loss by oral compared to nasal expiration in healthy subjects. Rhinology, 44(1), 74-77.

Taheri, M., and Arabameri, E. (2012). The effect of sleep deprivation on choice reaction time and anaerobic power. Asian Journal of Sports Medicine, 3(1), 15-20.

Vogiatzis, I., et al. (2008). Contribution of respiratory muscle blood flow to exercise-induced diaphragmatic fatigue in trained cyclists. The Journal of Physiology, 586(22), 5575-5587.

Watso, J. C., et al. (2023). Acute nasal breathing lowers diastolic blood pressure and increases parasympathetic contributions to heart rate variability. American Journal of Physiology, 325(6), R797-R808.

Woorons, X., et al. (2007). Prolonged expiration down to residual volume leads to severe arterial hypoxemia in athletes. Respiratory Physiology and Neurobiology, 158(1), 75-82.

Woorons, X., et al. (2020). Transferable Benefits of Cycle Hypoventilation Training for Run-Based Performance. International Journal of Sports Physiology and Performance, 15(8), 1103-1108.

Yamamoto, Y., et al. (1988). Delayed appearance of blood lactate with reduced frequency breathing during exercise. European Journal of Applied Physiology, 57(4), 462-466.

Yeager, S. (2019). Here's How Much Longer to Sleep If You Want to Get Faster. Bicycling.