0313 Implementation Outcomes from a Multi-Component Lighting Intervention in Shiftworkers on a High-Security Submarine Watchfloor

Abstract Introduction Shiftwork is prevalent in the military and causes circadian health performance impairments. Negative consequences may be mitigated through evidence-based lighting solutions that optimize timing, spectrum intensity of exposure; however, practical utility these hinges on their implementation adoption. Therefore, we examined effectiveness a multi-component intervention had demonstrated efficacy for improving alertness active duty service members working nightshift schedules high-security watchfloor. Methods Participants worked 12-h shifts (0530-1730) (N=56, 9 females; mean+SE age=28.95 + 0.76). Lighting interventions included two types LED panels (3,721 cm2) were either enhanced (SW+) or depleted (SW-) short wavelength energy (both ~3000 K, ~300 lux at 46 cm from eyes). For both SW+ SW- conditions, bank arranged across front watchfloor illuminated entire nightshift. In addition, blue-blocker glasses worn after nightshifts up until bedtime, eye masks during sleep conditions. Data collection coincided with existing schedules: there was an 8-day baseline (BL1) condition, (BL2) condition (order within those 16-day periods pseudo-randomized). Implementation measured via weekly questionnaires. Results who completed BL1, SW+, conditions (n =24) reported more positive feelings (happy, alert, relaxed) fewer negative (sad, sleepy, anxious) compared to standard lights (p< 0.05 SW-). More symptoms (e.g. glare, headache, fatigue) BL1 versus 0.01). Most participants same better under (96% 95% SW-); 75% found somewhat very easy use; 100% as each tool. Finally, most they would want keep end study. Conclusion The generally well-received by participants, thus providing evidence feasibility implementing strategies mitigate shiftwork. Support (if any) ONR TS-788