Float Therapy & HRV (N=1 Data)
Five consecutive 60-90 minute sensory deprivation float sessions produced measurable HRV improvements over baseline.
N=1 Evidence
- FW Float Company operator: 5 consecutive 60-90 min float sessions vs 5 baseline non-float days
- Device: WHOOP
Structured A/B protocol with equal baseline and intervention periods.
Tertiary map
Wikipedia: Isolation tank (wikipedia-isolation-tank-overview) describes sensory-deprivation flotation hardware and history.
Clinical literature (PubMed; heterogeneous designs)
Lashgari et al. 2025 (lashgari-2025-flotation-rest-systematic-review) PRISMA survey of 63 primary flotation-REST studies (1,838 participants; search through May 2024): authors report broadly favorable narrative patterns for pain, athletic performance, stress, wellbeing, and clinical anxiety, with limited supportive pattern for sleep-disorder and smoking-cessation applications in their included set—read as a landscape review, not pooled endpoint meta-analysis. WHOOP row above stays N=1 tier.