The Wearable Paradox: Health Metrics vs. Human Behavior

The wearable revolution has brought about a sea change in how we track our physical activity, heart rates, and other bodily functions. Devices like Apple Watches, FitBits, and Oura Rings have become ubiquitous, with over half of the US population owning one. But as these devices continue to flood the market with an onslaught of data, it’s worth asking: what does this tidal wave of information really mean for our health?

Dr. Ami Bhatt of the American College of Cardiology believes that the most valuable insights come from metrics that prompt us to alter our habits and make healthier choices. According to Dr. Michael Joyner, an exercise physiologist at the Mayo Clinic, a metric is useful only if it meets three criteria: Is it measurable? Does it actually mean something? And can you act on the information?

Joyner notes that many wearables fall short on this last point. While they provide a wealth of data, there often isn’t a clear link between tracking certain metrics and making positive changes in our behavior. For example, heart rate variability (HRV) has gained popularity, with some devices using it to deliver “recovery” scores. However, despite its scientific basis – studies have shown a link between HRV and overall health – there’s no concrete evidence that tracking HRV will improve long-term outcomes.

Joyner argues that following established heart health guidelines, such as eating a balanced diet and exercising regularly, is far more effective than obsessing over specific metrics. The data from wearables can be interesting, but it shouldn’t supplant common sense or established medical knowledge. In fact, the lack of standardization in wearable measurements makes it difficult to compare results across brands.

The value from wearables lies not in the specific numbers they report but rather in the long-term trends they can track. By collecting personal data over time, these devices can help individuals understand what’s normal for them and identify any changes that may signal a health issue. This understanding is crucial because it allows people to make informed choices about their behavior.

While wearables have revolutionized how we monitor our physical activity, it’s essential to keep expectations in check. We shouldn’t rely solely on the data from these devices to inform our decisions about health and fitness. Instead, we should view them as tools that can complement established medical knowledge and healthy habits. As Dr. Joyner puts it, “Follow the guidelines. People who follow the guidelines are going to do better on these metrics.”