PHIT for Duty™, a mobile application for stress reduction, sleep improvement, and alcohol moderation
Kizakevich, P., Eckhoff, R., Brown, J., Tueller, S., Weimer, B., Weeks, A., ... King, L. A. (2018). PHIT for Duty™, a mobile application for stress reduction, sleep improvement, and alcohol moderation. Military Medicine, 183(suppl_1), 353-363. DOI: 10.1093/milmed/usx157
Post-traumatic stress and other problems often occur after combat, deployment, and other military
operations. Because techniques such as mindfulness meditation show efficacy in improving mental health, our team
developed a mobile application (app) for individuals in the armed forces with subclinical psychological problems as
secondary prevention of more significant disease. Based on the Personal Health Intervention Toolkit (PHIT), a mobile
app framework for personalized health intervention studies, PHIT for Duty integrates mindfulness-based relaxation,
behavioral education in sleep quality and alcohol use, and psychometric and psychophysiological data capture. We
evaluated PHIT for Duty in usability and health assessment studies to establish app quality for use in health research.
Participants (N = 31) rated usability on a 1 (very hard) to 5 (very easy) scale and also completed the System Usability
Scale (SUS) questionnaire (N = 9). Results were (mean ± SD) overall (4.5 ± 0.6), self-report instruments (4.5 ± 0.7),
pulse sensor (3.7 ± 1.2), sleep monitor (4.4 ± 0.7), sleep monitor comfort (3.7 ± 1.1), and wrist actigraphy comfort
(2.7 ± 0.9). The average SUS score was 85 ± 12, indicating a rank of 95%. A comparison of PHIT-based assessments
to traditional paper forms demonstrated a high overall correlation (r = 0.87). These evaluations of usability, health
assessment accuracy, physiological sensing, system acceptability, and overall functionality have shown positive results
and affirmation for using the PHIT framework and PHIT for Duty application in mobile health research.