Dark Skin: Are Denver Trackers Hiding Altitude Harm?

By Franklin Everett Shaw

February 19, 2026

Imagine gasping for air, not because you’re running a marathon, but simply because you’re living your everyday life. Now, imagine that feeling is masked, subtly hidden by a device you trust to monitor your health. This is the potential reality for individuals with darker skin tones living at high altitudes like Denver, Colorado, where wearable fitness trackers might not be providing the accurate blood oxygen saturation (SpO2) readings they need.

The problem isn’t just about inaccurate data; it’s about the potential for delayed diagnosis and treatment of altitude-related illnesses, a serious concern in the Mile High City.

Wearable fitness trackers have become ubiquitous, promising insights into our health and well-being. These devices often boast SpO2 monitoring, a crucial metric for assessing respiratory function. However, studies have shown that these sensors, which typically use light-based technology (pulse oximetry), can be less accurate in individuals with darker skin pigmentation. Melanin, the pigment responsible for skin color, absorbs more light, potentially interfering with the sensor’s ability to accurately detect the oxygen saturation in the blood.

This inherent bias is compounded by the physiological challenges of living at high altitude. Denver’s elevation (5,280 feet) means lower atmospheric pressure and, consequently, less oxygen available in the air. The body must adapt to this reduced oxygen level, a process called acclimatization. Failure to acclimatize can lead to altitude sickness, with symptoms ranging from headaches and nausea to more severe conditions like high-altitude pulmonary edema (HAPE) and high-altitude cerebral edema (HACE).

For individuals with darker skin in Denver, the combination of potentially inaccurate SpO2 readings from wearable trackers and the physiological stress of high altitude creates a perfect storm. A falsely elevated SpO2 reading could mask early signs of altitude sickness, delaying crucial interventions.

So, what can be done? The answer lies in a multi-pronged approach that prioritizes accurate monitoring, personalized acclimatization strategies, and a healthy dose of skepticism towards wearable tech.

First, ditch the reliance on wearable trackers for critical SpO2 monitoring. While they can be useful for general trends, they shouldn’t be the sole source of information, especially if you have darker skin and are experiencing symptoms of altitude sickness.

Instead, consider using a medical-grade pulse oximeter. These devices are typically more accurate and less susceptible to interference from skin pigmentation. You can purchase them at most pharmacies or online retailers. Look for models that have been clinically validated and are known for their accuracy across different skin tones.

However, even medical-grade pulse oximeters aren’t foolproof. Proper technique is crucial. Ensure the device is placed correctly on your finger, avoid movement during the reading, and warm your hands if they are cold, as poor circulation can affect accuracy.

Another challenge is understanding what constitutes a “normal” SpO2 level at Denver’s altitude. At sea level, a normal SpO2 is typically between 95% and 100%. In Denver, however, healthy individuals may have SpO2 levels in the low 90s. It’s essential to establish your baseline SpO2 level when you’re feeling well to have a reference point for comparison.

Acclimatization is key. If you’re new to Denver or visiting from a lower altitude, take it easy for the first few days. Avoid strenuous activities and gradually increase your exertion level as your body adjusts.

Here’s a step-by-step acclimatization plan:

1. Day 1: Arrive in Denver and rest. Avoid strenuous exercise. Drink plenty of fluids.
2. Day 2: Light activity, such as walking. Avoid hiking or running. Continue to hydrate.
3. Day 3: Moderate activity, such as a short hike at a lower elevation. Monitor your symptoms closely.
4. Day 4: Gradually increase activity levels as tolerated. If you experience symptoms of altitude sickness, descend to a lower elevation and rest.

Hydration is also crucial. High altitude can lead to dehydration, which can exacerbate altitude sickness symptoms. Drink plenty of water, and avoid excessive alcohol or caffeine consumption.

Listen to your body. This is perhaps the most important piece of advice. Don’t ignore symptoms of altitude sickness, even if your wearable tracker shows a “normal” SpO2 reading. Headaches, nausea, dizziness, and shortness of breath are all warning signs. If you experience these symptoms, descend to a lower elevation and seek medical attention.

Consider consulting with a healthcare professional. A doctor can provide personalized advice on acclimatization strategies and monitor your health during your transition to high altitude. They can also assess your risk factors for altitude sickness and recommend appropriate preventative measures.

Be aware of the limitations of wearable technology. While these devices can be helpful for tracking general fitness metrics, they should not be relied upon for critical health monitoring, especially in situations where accuracy is paramount, such as at high altitude or for individuals with darker skin tones.

Advocate for better technology. Demand transparency from wearable device manufacturers regarding the accuracy of their SpO2 sensors across different skin tones. Support research efforts aimed at developing more inclusive and accurate health monitoring technologies.

The challenges of accurate SpO2 monitoring at high altitude for individuals with darker skin are real and potentially dangerous. By understanding the limitations of wearable technology, prioritizing accurate monitoring methods, and adopting personalized acclimatization strategies, we can mitigate these risks and ensure that everyone in Denver can breathe easy. Don’t let a potentially inaccurate reading lull you into a false sense of security. Your health is worth more than a number on a screen.