This is your engine. It reflects how well your heart, lungs, and circulatory system are delivering oxygen to working muscles and clearing waste during effort.
Your Cardiovascular & Oxygen Efficiency score captures the performance of your heart, lungs, blood vessels, and the pathways that deliver oxygen to your muscles. It also evaluates how effectively your body is utilizing that oxygen once it arrives. If this system is strong, you have a powerful aerobic engine. If it's stressed, you might feel like you can't access your full capacity, like your pacing doesn't match your perceived effort, or like you fade in the later stages of long efforts. Your scan shows you whether the bottleneck is in delivery (heart and lungs) or utilization (how your tissues use the oxygen they receive).
Want the full picture? Keep reading.
Endurance performance is fundamentally an oxygen delivery problem. Your heart pumps oxygenated blood. Your lungs load that blood with oxygen and offload carbon dioxide. Your circulatory system distributes it to working muscles. And your tissues extract and use that oxygen to produce energy.
This system captures the entire chain. A strong cardiovascular system means you can sustain higher outputs for longer, recover faster between efforts, and maintain a lower heart rate at a given pace. A stressed system means there's a bottleneck somewhere in the chain, and your body is compensating.
Heart reflects the functional state of your cardiac muscle and its ability to pump blood efficiently. This point also plays a primary role in your Inflammation system, because cardiac stress and inflammatory load are closely connected. A strong Heart score means your pump is doing its job. A stressed score might reflect accumulated cardiovascular load from high-volume training, inadequate recovery, or systemic inflammation.
Lung and Lung Bronchioles capture your respiratory capacity at both the organ level and the bronchiole level (the smaller airways where gas exchange happens). These points also play secondary roles in your Inflammation system. Stress here can relate to respiratory efficiency, airway reactivity, or environmental irritants.
Circulatory System represents your vascular network: arteries, veins, and capillaries. This is the delivery infrastructure. Stress here suggests that blood flow distribution or vascular efficiency may be limiting your performance.
Coronary Plexus is the nerve network surrounding your heart. It bridges cardiovascular, inflammation, and neuromuscular systems. When stressed, it often reflects that your cardiac nervous system is working hard to regulate heart rhythm and output under training load.
Liver appears as a secondary influence across cardiovascular, energy, hydration, and inflammation systems. In the cardiovascular context, your liver affects blood quality, iron metabolism, and the clearance of metabolic waste from circulation. A stressed Liver can subtly limit your cardiovascular output.
Spleen filters blood and manages red blood cell recycling. It plays a secondary role here and in your Inflammation system. Stress on the Spleen can affect oxygen-carrying capacity.
Oxygen Utilization evaluates how effectively your tissues are extracting and using oxygen from your blood. You can have a strong heart and healthy lungs but still underperform if your oxygen utilization is compromised. Out-of-balance items here often reflect the difference between a strong engine and actually getting full value from that engine. This is one of the most common patterns on an Endurance Scan: strong primary points with an oxygen utilization bottleneck.
Feeling like you can go hard and long but never quite getting full value from your engine. Pacing that feels harder than it should relative to your fitness. Fading in the back half of races or long efforts. Heart rate that drifts higher than expected at steady paces. A sense that your aerobic capacity is there but you can't fully express it. Slower-than-expected recovery between intervals.
Inflammation. Heart, Lung, Lung Bronchioles, Coronary Plexus, and Spleen all bridge these two systems. Cardiovascular stress and inflammatory load are inseparable in endurance athletes. Training creates controlled damage. Your inflammatory system repairs it. When inflammation runs high, cardiovascular efficiency drops.
Energy Production & Metabolic Efficiency. Liver bridges both systems. Your cardiovascular system delivers fuel and oxygen; your metabolic system converts them into energy. A bottleneck in either one limits the other.
Hydration & Digestion. Liver is a shared secondary point. Blood volume, plasma quality, and hydration status directly affect cardiovascular output. Dehydration or poor nutrient absorption limits what your engine can do.
Train your aerobic base honestly. If your primary points are strong but Oxygen Utilization items are out of balance, you likely benefit from more time at genuinely easy, aerobic paces rather than spending too much time in moderate-hard "no man's land" efforts. Let your engine build efficiency.
Discipline your fueling around key sessions. Your Action Plan may recommend keeping fueling and hydration predictable around workouts and long runs so your system isn't scrambling to support oxygen delivery while also managing digestion.
Watch for inflammatory load. If your Inflammation score is also stressed, addressing that system can free up cardiovascular capacity. Systemic inflammation directly competes with cardiovascular efficiency.
Protect your recovery. Cardiovascular adaptations happen during rest, not during the workout itself. Consistent sleep and easy-day pacing are where your engine actually improves.
Follow your Balancing Protocol and scan again in 6 to 8 weeks to see how your cardiovascular efficiency responds.
Send us 5 supplements and we’ll test them with your scan to see if they balance with your body.
Supplements are a wonderful way to support your body as you heal. But, what if some of those supplements aren’t working or are causing your body to work harder? Send in up to 5 supplements with your Ruti Scan and we’ll test to see if they help balance you based on your results.
