Do Fitness Trackers Have the Ability to Forecast Injuries?

By
Anna Zucker
August 26, 2026

Journal Of Medical Internet Research

Overview

Wearable fitness devices provide a 'readiness' score that is marketed as a predictor of injury risk. Research indicates these scores do not directly forecast injuries, although they can help identify patterns over time.

Background

The use of wearable fitness devices has surged, with over one-third of US adults utilizing them to monitor health metrics. These devices often provide a 'readiness score' based on heart rate variability, sleep, and workload, which users rely on to guide their training.

Data Highlights

No numerical data or trial data available in the source material.

Key Findings

Readiness scores from wearables do not directly predict injury risk.
Heart rate variability (HRV), sleep, and workload metrics are used to derive readiness scores.
Longitudinal tracking of HRV can support the perception of fatigue and symptom onset.
Spikes in training load are significant risk factors for running-related injuries.
Sleep is considered the strongest indicator of injury risk among the metrics assessed.
Consistency in HRV readings is more informative than isolated values.

Clinical Implications

Clinicians should consider trends in HRV, sleep, and workload when assessing injury risk.

Conclusion

While wearable fitness devices offer valuable data, their readiness scores should be interpreted with caution, emphasizing the importance of a holistic approach to injury risk assessment.