Respiratory Load: The Work Behind Every Breath
You can see the effort when your horse gallops, jumps, or accelerates around a barrel. Less obvious is the work required to breathe through that effort.
As exercise becomes more demanding, your horse must move more air. The muscles responsible for breathing must generate the pressure needed to draw air through the airways and move the lungs and chest wall. Resistance along that pathway adds to the effort.
Breathing is part of your horse's workload. Understanding that work, and where it can be reduced, is an important part of caring for the equine athlete.
What Does Respiratory Load Mean?
Here, respiratory load describes the demands placed on breathing and the effort required to meet them.
The amount and speed of airflow matter. So do the resistance encountered along the airway and the mechanical effort needed to move the respiratory system. The demands change throughout a session as the horse moves from easier work to harder efforts and then recovers.
The useful question is: what breathing demands does this horse's actual work create?
Intensity, Duration and Repetition Shape the Challenge
A short sprint can create a high demand for airflow over a brief period. A sustained effort requires breathing work to continue for longer. Repeated efforts create recurring demands, and the recovery between them becomes part of the overall picture.
These patterns occur in different combinations across equestrian sports.
A barrel horse accelerates into a short, intense run. An event horse maintains effort across a course with changes in terrain and jumping demands. A jumper may complete a substantial warm-up before a round and then return for a jump-off. A polo pony repeatedly accelerates during play.
Roping practice can involve multiple pursuits and accelerations. Endurance involves prolonged exercise with harder sections shaped by pace and terrain. Thoroughbred preparation includes conditioning gallops and breezes as well as racing.
Reining combines fast circles, spins, and repeated maneuvers. Reined cow horse work adds rapid acceleration, turns, and sustained effort while controlling a cow. In both disciplines, the warm-up and repeated schooling efforts also contribute to the horse's overall workload.
Each example calls for attention to the work actually performed, including the work at home.
Why the Nose Matters
Horses are obligate nasal breathers: air travels through the nasal passages during exercise. The entrance to the airway therefore remains part of the route for every breath, even as demand rises.
The equine nostril is adaptable. Its muscles and supporting structures allow its shape and opening to change. During inhalation, the horse lowers pressure within the airway to draw air toward the lungs. That pressure difference also draws compliant nasal tissues inward.
FLAIR Strips support nasal tissues to reduce inward collapse during inhalation.
When the passage narrows, resistance increases. Maintaining airflow through a more resistant passage requires a greater pressure difference. Nasal support addresses this relationship between tissue movement and incoming airflow.
Where FLAIR Strips Fit
FLAIR® Equine Nasal Strips support tissues over the nasal passages. Controlled exercise research found reduced inspiratory resistance with FLAIR Strips. [1]
That provides a specific reason to include nasal support in respiratory management: it addresses one component of the mechanical burden of inhalation.
Conditioning, airway health, environmental management, and appropriate recovery remain part of the wider preparation plan. Nasal support has a defined role within that plan.
What the Research Tells Us
Research on FLAIR Strips has examined airway resistance, breathing pressures, oxygen consumption, exercise-induced pulmonary hemorrhage, and time to fatigue. These measurements address both the effort of breathing and the physiological demands associated with intense exercise.
Reduced Resistance During Inhalation
Michigan State University researchers measured airflow and tracheal pressures in exercising horses with and without FLAIR Strips. With the Strips, inspiratory airway resistance was significantly reduced, and peak inspiratory pressure was less negative. These findings show that nasal support reduces the resistance the horse must overcome when drawing air into the lungs, supporting a reduction in the work of breathing.
Lower Oxygen Consumption During Demanding Exercise
Researchers also measured the oxygen horses consumed while performing a prescribed treadmill workload. Poole and colleagues found significantly lower oxygen consumption with FLAIR Strips. Geor and colleagues reported a similar finding toward the end of a high-intensity sprint. The authors interpreted these results as evidence consistent with a reduced oxygen cost of breathing and a lower metabolic cost of exercise.
Reduced Severity of Bleeding in the Lungs
Breathing mechanics also matter to the stresses placed on the lungs. During intense exercise, high pressure inside pulmonary capillaries combines with strongly negative pressure surrounding them during inspiration. This pressure difference contributes to damage to the thin blood-gas barrier and exercise-induced pulmonary hemorrhage, or EIPH.
Several controlled studies quantified bleeding by counting red blood cells in fluid collected from the lungs after exercise. They found significantly reduced EIPH severity with FLAIR Strips. Supporting the nasal airway may reduce the negative-pressure component of this stress, providing a physiological connection between nasal support and the bleeding findings.
Together, these findings give FLAIR Strips a meaningful place in respiratory management: reducing resistance to inhalation, with research supporting benefits for the metabolic demands of exercise, EIPH severity, and exercise tolerance.
Respiratory Load, Stress and Fatigue
The words describe different things.
Load refers to the demands on breathing and the effort required to meet them.
Stress describes the physiological strain that can accompany those demands, such as larger pressure swings or greater mechanical demands on tissues.
Fatigue can develop when muscles can no longer sustain the force required of them. For the breathing muscles, that means a reduced ability to maintain the pressure needed to move air. This is why the magnitude and duration of respiratory load matter: the muscles must sustain that work throughout exercise. Increased breathing effort alone, however, does not establish that those muscles have become fatigued.
Respiratory management starts with recognizing the demands of the work and identifying opportunities to reduce unnecessary resistance to breathing.
What About Horses Competing at Lower Levels?
Respiratory demands depend on the task and the horse performing it. A competition label cannot account for the length of the warm-up, the number of repeated efforts, the terrain, or the horse's conditioning.
That makes respiratory management relevant beyond elite competition. It also makes demanding training worth considering in its own right. The horse still performs the work even when there is no competition number, finish line, or placing.
Consider nasal support in relation to the horse's actual workload, including demanding schooling and conditioning sessions.
Put Breathing Into the Preparation Plan
Look at the whole session. Identify the most intense efforts, how long demanding work continues, and how often the horse repeats it. Consider the opportunities for recovery alongside the work itself.
Choose nasal support backed by published, peer-reviewed research on the product itself. A nasal strip's design determines how it supports the airway, and evidence for one product does not automatically apply to another. FLAIR Strips have been evaluated in controlled studies measuring airway resistance, oxygen consumption, and EIPH severity.
Discuss concerns about breathing or exercise tolerance with your veterinarian. When planning nasal support, use the product's application instructions and check the requirements of the relevant competition authority.
Breathing requires work. Recognizing that work makes respiratory management a deliberate part of preparing the equine athlete.
Performance Starts at the Nose.
Supporting Research
- Holcombe SJ, et al. Effect of commercially available nasal strips on airway resistance in exercising horses. American Journal of Veterinary Research. 2002;63(8):1101-1105.
- Poole DC, et al. Effects of external nasal support on pulmonary gas exchange and EIPH in the horse. Journal of Equine Veterinary Science. 2000;20(9):578-585.
- Geor RJ, et al. Effects of an external nasal strip and frusemide on pulmonary haemorrhage in Thoroughbreds following high-intensity exercise. Equine Veterinary Journal. 2001;33(6):577-584.
- Kindig CA, et al. Efficacy of nasal strip and furosemide in mitigating EIPH in Thoroughbred horses. Journal of Applied Physiology. 2001;91:1396-1400.
