Smartwatches May Detect Depression Relapse Weeks Before Symptoms Return

Wearable trackers, like smartwatches and fitness trackers, are showing promise as tools for detecting the early signs of depression relapse, potentially weeks or even months before a person experiences a full-blown episode. This advancement leverages the known link between sleep patterns and mental health, offering a proactive approach to managing major depressive disorder (MDD).

The Connection Between Sleep and Depression

Sleep disturbances are both a symptom and a risk factor for depression. Detecting changes in sleep patterns could allow for earlier intervention and potentially prevent a relapse. Up to 60% of individuals with MDD will experience at least one relapse episode in their lifetime, highlighting the need for improved monitoring and preventative strategies.

How Wearable Trackers Work

Recent research from McMaster University, published in JAMA Psychiatry, suggests that wrist-worn devices can identify subtle changes in a person’s daily rhythms that may indicate an increased risk of relapse. The study followed 93 adults across Canada who had recovered from depression, using research-grade actigraphy devices (similar to FitBits or Apple Watches) to monitor their sleep and activity levels for one to two years. Researchers analyzed over 32,000 days of data to identify patterns associated with relapse risk.

Key Findings from the McMaster Study

• Irregular Sleep Schedules: Participants with the most irregular sleep schedules had nearly double the risk of experiencing a depressive relapse.
• Activity-Rest Imbalance: The strongest predictor of relapse was a diminished difference between daytime activity and nighttime rest.
• Wake Time After Sleep: The amount of time spent awake after initially falling asleep was also associated with an increased risk of relapse.
• Progressive Sleep Changes: Sleep schedules tended to become more erratic in the weeks leading up to a relapse.

The Potential for Proactive Mental Healthcare

“Advances in digital technology and AI algorithms have a great potential for relapse prevention in mental health,” says Benicio Frey, MD, professor in the Department of Psychiatry and Behavioural Neurosciences at McMaster University. “Imagine a future where a smartwatch can warn people with depression: ‘A new episode of depression is highly likely coming within the next four weeks. How about seeing your health-care provider?’”

This technology offers the opportunity for passive data collection and continuous insight between clinical appointments, filling a gap in current monitoring strategies that often rely on self-reported symptoms.

Beyond Sleep: Recognizing the Broader Symptoms of Depression

While sleep disruption is a key indicator, it’s critical to remember that depression manifests in various ways. Common symptoms include:

• Persistent feelings of sadness, anxiety, or emptiness
• Feelings of frustration, irritability, or restlessness
• Feelings of hopelessness or pessimism
• Loss of interest or pleasure in hobbies and activities
• Feelings of guilt, worthlessness, or helplessness
• Difficulty concentrating, remembering, or making decisions
• Fatigue and lack of energy
• Changes in appetite or unplanned weight changes
• Physical aches, pains, headaches, or digestive problems
• Thoughts of death or suicide

To be diagnosed with depression, these symptoms must be present most of the day, nearly every day, for at least two weeks.

The Future of Wearable Mental Health Monitoring

Researchers believe wearable-derived alerts could help clinicians target care to those most at risk, improving outcomes and reducing the burden of recurrent depressive episodes. The study highlights the untapped potential of wearable technology for individuals recovering from MDD. As Alex Dimitriu, MD, double board certified in Psychiatry and Sleep Medicine, notes, “Our biology, especially mental health-related, is often quite a fuzzy signal… Tracking with wearables over longer periods of time can begin to expose patterns which would otherwise be hard to detect.”

If you are experiencing symptoms of depression, it is important to speak with a mental health or healthcare professional.