Highlights:
- Preliminary, placebo-controlled pilot in rotating-shift firefighters (PBM n=3 vs placebo n=3): PBM was associated with better overall sleep quality (improved PSQI) across the intervention period.
- Broader well-being + quality-of-life signals: PBM participants reported higher daily energy, mood, restfulness on waking, and improved health-state domains (e.g., pain/discomfort, anxiety/depression).
- Functional outcomes trended positive: Exploratory measures suggested improvements in grip strength and jump performance versus little/no change with placebo.
- Participant feedback aligned with the numbers: Reports of easier sleep onset, fewer awakenings, deeper sleep, better daytime alertness, and reduced reliance on caffeine.
Overview
Firefighters working rotating day and night shifts are chronically exposed to circadian disruption, poor sleep quality, fatigue, and reduced quality of life. This pilot study evaluated whether targeted photobiomodulation (PBM), delivered with a dual-wavelength Avant Wellness system, could improve sleep and well-being under these challenging real-world conditions
Background
Photobiomodulation (PBM) is a non-invasive therapy that uses red and near-infrared light to modulate mitochondrial activity, oxidative stress, inflammation, and autonomic regulation. Emerging evidence suggests PBM may support sleep and recovery by influencing brainstem and vagal-related pathways involved in arousal, stress response, and circadian adaptation—mechanisms particularly relevant for shift workers.
Study Design
This placebo-controlled pilot study included six male firefighters allocated to PBM (n = 3) or placebo (n = 3). Participants alternated weekly between day (8:00 am–8:00 pm) and night (8:00 pm–8:00 am) shifts.
PBM was delivered using a dual-wavelength protocol (near-infrared + red light) applied to anatomically selected regions associated with autonomic and brainstem regulation, including the base of the skull, behind the ears, upper lip, and lower abdominal region. Sessions were performed four consecutive days per week over multiple weeks, aligned with shift transitions.
Outcomes included sleep quality (PSQI), health-related quality of life (EQ-5D-5L), general well-being questionnaires, physical performance measures, and qualitative participant feedback.
Key Findings
Across the six-week intervention, the PBM group showed consistent improvements across multiple domains, while the placebo group showed minimal change or worsening:
- Sleep Quality: PBM was associated with improvements in subjective sleep quality, sleep duration, and a reduction in global PSQI score, indicating better overall sleep.
- Quality of Life: Participants receiving PBM improved their overall health state index, with reductions in pain/discomfort and anxiety/depression domains.
- Well-Being: Marked gains in perceived daily energy, mood, restfulness on waking, and perceived job performance were observed in the PBM group.
- Physical Performance: Exploratory outcomes suggested improvements in jump performance and grip strength with PBM, contrasting with little or no improvement in placebo.
Qualitative feedback reinforced these findings, with PBM participants reporting easier sleep onset, fewer awakenings, deeper sleep, improved daytime alertness, better recovery between shifts, and reduced reliance on caffeine.
Takeaway
This pilot study provides preliminary evidence that targeted photobiomodulation may help counteract sleep disruption and reduced well-being associated with rotating shift work. By applying PBM to regions plausibly linked to autonomic and brainstem regulation, the intervention was associated with improvements in sleep quality, quality of life, and functional outcomes in firefighters exposed to significant circadian stress.
Although limited by small sample size, the consistency across quantitative measures and participant experience supports PBM as a promising, non-invasive strategy for occupational populations facing chronic circadian disruption.
Reference:
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