
You go for a run. You breathe evenly. Nothing hurts. Everything seems fine. But after 10–15 minutes of intense running, your lungs may be working at their limit, and you don't even feel it.
The problem with most lung diseases is that they don't show symptoms for a long time. Decreased alveolar ventilation, rising carbon dioxide, falling tidal volume — all of this can happen without symptoms until the load becomes critical.
This is where ACCO AI watches change the rules. Every 5 minutes, they measure 16 lung health parameters and warn about risks before you feel shortness of breath, dizziness, or chest pain.
ACCO AI watches track 16 respiratory system indicators. These include:
Respiratory Quotient (RQ) — shows the ratio of carbon dioxide produced to oxygen consumed and helps understand which nutrients are being oxidized in the body.
Alveolar Ventilation (VA) — measures the volume of air that actually reaches the alveoli and participates in gas exchange.
Ventilation/Perfusion Ratio (VA/Q) — evaluates the balance between airflow and blood flow in the lungs. When this balance is disturbed, gas exchange becomes inefficient.
Venous Oxygen Saturation (SvO₂) — shows how much oxygen is in the venous blood returning to the heart.
Arterial Oxygen Partial Pressure (PaO₂) — reflects the tension of oxygen dissolved in arterial blood.
Venous Oxygen Partial Pressure (PvO₂) — shows the oxygen tension in venous blood after tissues have taken the required amount of oxygen.
Pulmonary Vascular Resistance (PVR) — measures how much load the right ventricle of the heart experiences when pumping blood through the vessels of the lungs.
Arterial Oxygen Content (CaO₂) — reflects the total amount of oxygen (both dissolved and bound to hemoglobin) in arterial blood.
Venous Oxygen Content (CvO₂) — shows the total amount of oxygen in venous blood.
Arterial Carbon Dioxide Partial Pressure (PaCO₂) — reflects the pressure of CO₂ dissolved in arterial blood. This parameter affects the acid-base balance (pH) of the blood.
Minute Ventilation Volume (VE) — measures the total volume of air passing through the lungs in one minute. This parameter is related to breathing rate and depth.
Arterial Oxygen Saturation (SaO₂) — shows the degree to which hemoglobin is bound to oxygen. This is one of the key indicators of blood oxygenation.
Oxygen Consumption (VO₂) — reflects the total volume of oxygen the body consumes per unit of time. It depends on metabolic intensity.
Oxygenation Index (OI) — evaluates the efficiency of oxygen uptake by the lungs. It is calculated as the ratio of PaO₂ to the fraction of inspired oxygen.
Tidal Volume (VT) — measures the volume of one breath in or out at rest. It is related to age, gender, body surface area, and breathing habits.
Oxygen Extraction Ratio (O₂ER) — shows what percentage of oxygen tissues take from the blood. It reflects the efficiency of oxygen utilization by the body.
All 16 parameters are analyzed every 5 minutes without needles, without tubes, without breathing masks — just from the wrist.
What does AI do with these parameters?
Artificial intelligence analyzes all indicators as a complex system and outputs three components for each measurement.
The first component is Implication. This is an explanation of what the current value of the parameter means from a physiological point of view. For example, for the parameter Tidal Volume (VT), AI will explain that this is the volume of gas inhaled or exhaled in one cycle at rest, and that it is related to age, gender, body surface area, and metabolism.
The second component is Evaluation. This is an assessment of the condition, indicating possible causes of the deviation. For example, if Alveolar Ventilation (VA) is decreased, AI will indicate that this is characteristic of COPD, bronchial asthma, or obesity. If Minute Ventilation Volume (VE) is increased, AI will link this to shallow rapid breathing or weakness of the respiratory muscles.
The third component is Suggestion. These are personalized recommendations that AI gives to the user. They may relate to lifestyle (quitting smoking, avoiding hypothermia, weight control), visiting a doctor (for persistent deviations or onset of symptoms), changing training regimens (reducing pace, switching to walking, increasing breathing depth), or even medical procedures (such as low-flow oxygen therapy at home for COPD).
Thus, AI does not just show numbers. It translates them into human language: explains what the deviation means, why it occurred, and what to do about it right now.
This is the key question. And the answer is: most often, no. Many lung disorders develop silently, and you won't know about them until it's too late.
A decrease in Alveolar Ventilation (VA) gives no sign of itself during running. You just breathe deeper, but you still lack oxygen. Fatigue builds up faster than usual, but you chalk it up to being "out of shape" or poor preparation.
A rise in carbon dioxide in the blood — an increase in Arterial Carbon Dioxide Partial Pressure (PaCO₂) — also remains unnoticed for a long time. You don't feel the buildup of CO₂. Only at very high values do headache, drowsiness, or confusion appear — but by then the problem is already serious.
A drop in Tidal Volume (VT) forces you to breathe more often but shallower. This saves energy but sharply reduces the efficiency of gas exchange. You just think, "I'm out of breath," and keep running, unaware that your lungs are working inefficiently.
An increase in Pulmonary Vascular Resistance (PVR) has no symptoms at all during exercise. The heart pumps blood through narrowed lung vessels, the right ventricle becomes overloaded, but you don't feel this. The first sign may be sudden weakness or even fainting at the finish line.
A decrease in Minute Ventilation Volume (VE) makes you breathe shallowly. There is little oxygen, but you don't suffocate — you just get tired faster. And you blame it on the intensity of the workout.
Even microcirculation disorders, where oxygen saturation paradoxically becomes higher than normal (SaO₂ above 99%), give no symptoms. Oxygen is in the blood, but it does not reach the tissues. And you feel nothing.
The only exception is a sharp drop in blood oxygen saturation (SaO₂) below 90–92%. This causes shortness of breath, dizziness, and a feeling of lack of air. But by this point, the problem is already advanced, and the clock may be ticking in minutes.
The bottom line: you won't know about most lung problems during running until it's too late. This is why AI monitoring every 5 minutes is necessary.
Example 1. Jogging at 6 km/h, 15th minute
What happens without you noticing: Tidal Volume (VT) has dropped from 450 to 390 milliliters, although the norm is 400–600. You breathe more often but shallower. The watch records a drop in tidal volume below normal. AI outputs: Implication — "Tidal volume is decreased. This reduces gas exchange efficiency." Evaluation — "Possible shallow breathing or lung lesion." Suggestion — "Focus on deep breathing. If the value does not recover, reduce your pace." Without the watch, you would just keep running, thinking fatigue is normal.
Example 2. Interval running, acceleration to 12 km/h
What happens without you noticing: Pulmonary Vascular Resistance (PVR) has risen from 170 to 280, with a norm of 120–250. The right ventricle of the heart is working under overload. The watch records an increase in resistance above normal. AI outputs: Implication — "Increased resistance in lung vessels. This loads the right ventricle." Evaluation — "Risk of pulmonary hypertension or thromboembolism." Suggestion — "Reduce intensity immediately. Switch to walking for 5–10 minutes. If it happens again, consult a cardiologist." Without the watch, you might finish the interval and then feel unexplained weakness after the workout.
Example 3. Long run of 10 kilometers, 40th minute
What happens without you noticing: Arterial Carbon Dioxide Partial Pressure (PaCO₂) has risen to 46 mmHg, with a norm of 32–42. Carbon dioxide is accumulating in the blood. The watch records an increase in PaCO₂ above normal. AI outputs: Implication — "Carbon dioxide is accumulating in the blood. This affects pH." Evaluation — "Hypoventilation. Risk of respiratory acidosis." Suggestion — "Slow down, take several deep exhalations. If the deviation persists, end your workout." Without the watch, you might notice nothing except mild drowsiness after the run.
Example 4. Running in hot weather with dehydration
What happens without you noticing: Alveolar Ventilation (VA) has dropped to 3.4 liters per minute, with a norm of 4–6. You breathe, but air does not reach the alveoli well. The watch records a decrease in VA below normal. AI outputs: Implication — "Air does not reach the alveoli well. Gas exchange is impaired." Evaluation — "Decreased alveolar ventilation. Risk of hypoxia." Suggestion — "Drink water, reduce your pace. Breathe through your nose. If the value does not recover, stop running." Without the watch, you just feel that "your legs are heavy" and blame it on the heat.
Artificial intelligence analyzes all 16 parameters and identifies risks of the following diseases and conditions: chronic obstructive pulmonary disease (COPD), bronchial asthma, obesity, hypoventilation, airway obstruction, shallow breathing, respiratory muscle weakness, hyperbaric oxygenation, microcirculation disorder, lung parenchyma lesion, myasthenia gravis, postoperative hypoventilation, pulmonary hypertension, pulmonary embolism, decreased metabolism, and hypothyroidism.
If AI says that Tidal Volume (VT) is decreased, this indicates shallow breathing. Your action during running is to focus on deep breathing, taking fuller inhales and exhales.
If AI warns about an increase in carbon dioxide partial pressure (PaCO₂), this is a sign of hypoventilation. You need to slow down and take several deep exhalations to remove excess carbon dioxide.
If AI warns about a decrease in Alveolar Ventilation (VA), air is not reaching the alveoli well. It is recommended to reduce your pace, drink water, and make sure you are breathing through your nose rather than your mouth.
If AI records an increase in Pulmonary Vascular Resistance (PVR), this is a sign of overload on the right ventricle of the heart. In this case, you need to immediately reduce intensity or switch to walking. Ignoring this warning is dangerous.
If AI records a decrease in Minute Ventilation Volume (VE), this is about shallow rapid breathing. Your task is to increase the depth of each breath, even if you have to reduce your running pace.
If AI shows that Arterial Oxygen Saturation (SaO₂) is above normal (above 99%), this may indicate a microcirculation disorder. In this situation, after your workout you should see a doctor for further evaluation.
If AI warns about a decrease in Oxygen Consumption (VO₂), this may be a sign of decreased metabolism or hypothyroidism. It is recommended to have your thyroid gland and overall metabolism checked.
Finally, if several parameters deviate simultaneously and oxygen saturation (SaO₂) drops below 90–92%, AI issues a warning: "Critical lung condition. Stop exercising immediately. Seek help if shortness of breath or dizziness occurs."
Lungs do not hurt. They do not send signals like the heart. You can run a marathon with decreased Alveolar Ventilation (VA) or elevated CO₂ (PaCO₂) in your blood — and feel nothing beyond ordinary fatigue.
ACCO AI watches with 16 lung health parameters and measurements every 5 minutes see what you do not feel. They warn about risks of hypoxia, hypercapnia, and right ventricular overload — before you collapse or lose consciousness. And thanks to the three-component structure — Implication, Evaluation, Suggestion — you get not just numbers, but clear explanations and specific actions.
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