A 1.8 ATA session is considered “mild-to-moderate” hyperbaric therapy. Unlike the standard 2.0–2.4 ATA used in hospitals, a 1.8 ATA soft chamber is often used for sports recovery, cognitive enhancement, and chronic wellness.
Immediate Feelings (0–2 Hours Post-Session)
- Relaxation or “Oxygen High”: Many users report a sense of calm or mild euphoria immediately after exiting. This is due to the increased oxygen saturation in the blood and brain.
- Mild Fatigue: Conversely, some people feel temporary “oxygen-induced fatigue.” This happens as the body works to process the extra oxygen and clear metabolic waste (detoxification).
- Mental Clarity: Improved focus or “brain fog” lifting is common, often described as feeling “sharp” or “alert.”
- Physical Lightness: A reduction in perceived muscle soreness or joint stiffness, particularly for those using it for athletic recovery.
Physical Sensations & Side Effects
- Ear “Popping”: Just like after a flight, your ears may feel “full” for a few minutes while the pressure equalizes back to sea level.
- Hydration Needs: You may feel more thirsty than usual. Increased oxygen levels can stimulate metabolic processes that require more water.
- Vision Clarity: Occasionally, users report temporary changes in vision (slight improvement or blurriness) due to the effect of pressure on the eye lens; this usually resolves within an hour.
Short-Term Results (Next 24–48 Hours)
- Improved Sleep: One of the most frequently reported benefits is deeper, more restorative sleep the night of a session.
- Reduced Inflammation: If you have an injury, you may notice decreased swelling or less localized pain.
- Increased Energy: After any initial fatigue wears off, many users experience a “rebound” energy surge that lasts for a day or two.
PubMed References
While many clinical studies use higher pressures (2.0–2.4 ATA), recent research specifically explores the efficacy of lower pressures (1.5–1.8 ATA) for various conditions.
- On Brain Injury & Edema (1.8 ATA efficacy):
- Reference: The efficacy of hyperbaric oxygen in hemorrhagic stroke: experimental and clinical implications. * Summary: This study noted that while 2.0 ATA is often seen as optimal, pressures of 1.8 ATA were found to significantly reduce brain water content (edema) by about 40% in experimental models, proving it effective for neurological recovery.
- PMID: 28867554 (PMC5575217)
- On Safety & Adverse Events (General Pressures):
- Reference: Adverse effects of hyperbaric oxygen therapy: a systematic review and meta-analysis.
- Summary: This review covers the side effects across various pressures. It highlights that lower pressures (like 1.8 ATA) carry a significantly lower risk of serious side effects (like oxygen toxicity) compared to higher clinical pressures, making them safer for frequent use.
- PMID: 37257962 (PMC10232961)
- On Tissue & Ligament Healing:
- Reference: Efficacy and safety of hyperbaric oxygen therapy in ligament and tendon injuries: a systematic review.
- Summary: Analyzing pressures starting from 1.3 ATA, this study found that hyperbaric therapy enhances collagen density and fiber alignment, accelerating the healing of connective tissues even at “mild” pressures.
- PMID: 41036684 (Note: Recently published/ahead of print meta-analysis).
Disclaimer: Hyperbaric therapy should be done under the supervision of a professional. If you experience persistent ear pain, chest pain, or vision changes, consult a doctor immediately.