• Hot Tubs & Hydrotherapy
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$100 off your first order

Join the Elysiums list and we will show your code right here. One use per customer, on an order of $1,000 or more. Applies to infrared saunas, cold plunges, beds and mattresses, and selected recovery seating.

Research and sources

We describe what our products do in plain, everyday words, and this page lists the published research behind those words. Every study here was done in people and peer reviewed. Last reviewed November 2026.

Sauna

  • Hussain JN, Greaves RF, Cohen MM. A hot topic for health: results of the Global Sauna Survey. Complementary Therapies in Medicine, 2019. PubMed
  • Hussain J, Cohen M. Clinical effects of regular dry sauna bathing: a systematic review. Evidence-Based Complementary and Alternative Medicine, 2018. Full text

Cold plunge

  • Machado AF, et al. Can water temperature and immersion time influence the effect of cold water immersion on muscle soreness? A systematic review and meta-analysis. Sports Medicine, 2016. PubMed
  • Moore E, et al. Impact of cold-water immersion compared with passive recovery following a single bout of strenuous exercise on athletic performance in physically active participants. Sports Medicine, 2022. Full text
  • Yankouskaya A, et al. Short-term head-out whole-body cold-water immersion facilitates positive affect and increases interaction between large-scale brain networks. Biology, 2023. Full text
  • Roberts LA, et al. Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training. Journal of Physiology, 2015. Full text

Hot and cold contrast

  • Bieuzen F, Bleakley CM, Costello JT. Contrast water therapy and exercise induced muscle damage: a systematic review and meta-analysis. PLOS ONE, 2013. Full text

More sources are added here as we describe more of our range.

General education, not medical advice. Our products are not intended to diagnose, treat, cure or prevent any disease.