Using Activity Tracker Data as Evidence in Personal Injury Claims

Written by Tanya Waterworth, Digital Content Writer

About Our Legal Expert: This content is produced with oversight by Michael Jefferies, Managing Director who has over 30 years’ legal experience.

Can Wearable Tech Data Be Useful in Claims in England and Wales?

Using activity tracker data as evidence in personal injury claims may well become a tool for some personal injury claims in England and Wales. Personal injury claims have relied on medical records, witness statements, expert reports and CCTV footage. Importantly, the foundation of any personal injury claim is to prove that the accident caused injury which had a measurable impact on a claimant.

Wearable technology data can paint a picture of someone’s life before and after an accident. For example, if you were involved in a cycling accident, the data can show the location of the accident, as well as having a record of your fitness levels before and after the incident. Activity trackers are capable of monitoring time-stamped information, as well as factors such as heart rate and even stress response.

So, there is growing recognition that wearable technology may be a potential evidential goldmine in personal injury claims for compensation.

Why wearable data may help in injury claims

To file a claim for compensation you should be able to show that the injury you suffered was not your fault and that it directly caused harm which impacted your daily life. Wearable data may be able to support both points.

Activity trackers record objective, time‑stamped information and logs what happened. That can provide strong evidence when a claimant needs to demonstrate:

• A drop in daily activity after the accident
• Changes in sleep patterns
• Reduced heart‑rate variability (often linked to pain or stress)
• Inability to maintain pre‑injury exercise routines
• Periods of immobility or reduced step counts
• Disrupted routines that were previously consistent

A real‑world example: the runner who suddenly stopped running

Consider a claimant who regularly ran 5km every morning before work. Their smart watch logs months of consistent activity, including pace, distance, heart rate, cadence. After a road‑traffic collision, the data shows an abrupt halt. For the next six weeks, the device records almost no running activity and a dramatic drop in daily steps.

The claimant doesn’t need to rely solely on memory or a GP note saying they “reported pain”. The wearable data shows a clear pattern before and after the accident.

When wearable data undermines a claim

The flip side is equally important. Wearable data can be disclosed by either party and insurers are increasingly aware of its potential.

There was a widely reported Canadian case (not in England and Wales) where a fitness instructor’s activity‑tracker data was used to show she remained less active after an accident than before. In that instance, the data supported her claim. But the same principle could work the other way. If someone alleges they cannot walk more than a few minutes without pain, but their tracker shows they completed 12,000 steps a day, that inconsistency will be seized upon.

Therefore, claimants should therefore understand that if they rely on tracker data, they may need to disclose the full picture and not just the helpful parts.

Sleep data: the overlooked factor

Sleep disruption is a common symptom after accidents, especially those involving chronic pain or psychological injury. Wearables may now track sleep stages, duration and restlessness with accuracy.

Imagine a claimant who slept an average of seven hours a night before a workplace accident. Their tracker logs show that, in the months following the incident, they rarely exceed four hours and experience frequent wakeful periods. That pattern can support claims of ongoing pain, anxiety or trauma.

Sleep data is particularly persuasive because it is difficult to fake. You can choose to walk more steps, but you can’t easily manipulate your REM cycles.

Heart‑rate data and stress responses

Some devices track heart‑rate variability (HRV), which can reflect stress, fatigue and physical strain. After an accident, HRV may drop significantly. A claimant who has been in a road traffic accident may show elevated resting heart rates or spikes during certain activities, like travelling in a car following the collision.

While HRV evidence is still emerging in the legal sector, as the technology becomes more mainstream, it may well be seen as another piece of the evidential puzzle.

GPS data: proving location and activity

GPS‑enabled devices can show where a claimant was and what they were doing. This can be useful in several ways:

• Proving the claimant was at the accident location
• Demonstrating reduced mobility (e.g., shorter walking routes)
• Showing avoidance behaviours (e.g., no longer cycling on roads after a collision)

Here’s a practical example: A cyclist injured by a negligent driver may be able to use his wearable data to show he previously cycled 80–100 miles a week. But that after the accident, this pattern changed and his routes stopped entirely for months.

The legal considerations: admissibility and privacy

In England and Wales, wearable data is admissible as long as it is relevant and properly disclosed. The Civil Procedure Rules require parties to preserve and disclose electronic documents, which includes data stored on apps or cloud platforms.

However, privacy issues do arise as wearables may often collect far more information than is needed for a claim. A claimant may be comfortable disclosing step counts but less keen on sharing menstrual‑cycle data, stress scores or GPS routes that reveal private routines.

Solicitors are required take care when advising clients:

• What data exists
• What is relevant
• What must be disclosed
• What can be redacted
• How to preserve the integrity of the data

A claimant should never delete or alter data if litigation is being considered. Doing so risks adverse inferences or even allegations of misconduct.

The growth of wearable technology as evidence

Wearables are becoming more advanced, more common and more integrated into daily life. Three developments are particularly significant:

1. Medical‑grade wearables Devices, such as certain smart watches, now offer ECG readings and fall‑detection alerts. These features could become crucial in cases involving cardiac events or disputed mechanisms of injury.

2. Continuous monitoring Some wearables track data 24/7, creating a detailed timeline of activity. This can help establish the duration and severity of symptoms.

3. Integration with health apps Many devices sync with NHS apps, GP systems or third‑party platforms. While this creates a strong evidential trail, it also raises questions about data management and disclosure.

Practical tips for claimants

If someone has been injured and uses a wearable device, they should:

• Preserve all data from before and after the accident
• Avoid deleting or editing anything
• Share the existence of the data with their solicitor early
• Understand that both helpful and unhelpful data may need to be disclosed
• Keep the device charged and in regular use if they want to rely on ongoing data

Solicitors should also consider requesting wearable data from defendants where it could be helpful. For example, in cases involving disputed speed, location or activity levels.

Free Consultation and No Win No Fee Agreements

Wearable technology may strengthen a claim by providing objective information. As claims generally have a three year time limit from the date of the injury, it’s advisable to contact an experienced personal injury solicitor as early as possible. They will be able to assess your claim and if valid, can estimate compensation for your specific claim.

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This post gives general information, not legal advice. For specific legal guidance about your specific situation, speak to a personal injury solicitor.