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OSI Operational Stress Index

The OSI is a patented* algorithm that uses wearable and non-contact physiological sensors to objectively measure individualized stress. Use of the OSI as a real-time stress measure improves mental health, training effectiveness, and operational readiness. *U.S. Patent Nos. 9,801,553 and 11,324,426

How does it work?

Raw physiological data, such as pulse rate and electrodermal activity, along with contextual information such as skin temperature and movement data are captured by wearable or non-contact sensors. In real-time, the data is processed on a mobile device or onboard the biosensing device. The individual’s stress level is compared to a previously established baseline. Intuitive visualizations are available on customized mobile, web, and desktop applications.

Currently in use by the United States Air Force on a SBIR project (SHARP-ST) to monitor stress of Fighter Pilots while in flight and on the ground SBIR-STTR 2020 Tibbetts Award Winner

Military & Clinical

OSI supports Warfighter readiness for the modern operational environment:

Evaluate the utility of coping and decision making strategies

Adapt training content based on stress response

Personalize training based on individual and team stress responses

Provide after-action performance feedback

Identify resilient individuals and those who perform best under stress

Reduce symptoms of stress, anger, anxiety, and PTSD

Compare how well a training system replicates the stress of the operational environment

Proven to be over 95% accurate in operational and clinical applications.


USMC Infantry Small Unit Leader’s Course:

OSI measurements were predictive of individual resilience to stress, including the impact stress had on physiological reactivity and performance.

Cognitive behavioral therapy (CBT) for post-traumatic stress disorder (PTSD) treatment:

Active duty service members who used the OSI were less likely to discontinue therapy and significantly improved on measures of stress, anxiety, anger, and PTSD compared to service members undergoing standard CBT.

Current Efforts

DHS live training exercise stress measurement

US Air Force in-flight stress

Optimization of live Naval firefighting training

DARPA digital phenotyping using smartphone sensors


James Cooper “Coop” |