Can hydrogen gas prevent brain injuries from sports?

This mouse study suggests hydrogen gas breathing before exercise can significantly reduce brain injury severity. The protective effects lasted 24 hours and reduced brain swelling, inflammation, and oxidative damage.

How does hydrogen gas protect the brain from injury?

Hydrogen appears to activate the body's natural antioxidant defenses and reduce oxidative stress. It also helps maintain the blood-brain barrier, preventing harmful substances from entering brain tissue after injury.

How long do the protective effects of hydrogen gas last?

In this study, the brain-protective effects lasted at least 24 hours after hydrogen exposure. This is remarkable since hydrogen clears from the blood within about one hour of inhalation.

Is hydrogen gas safe for preventing brain injuries?

Hydrogen gas has been shown to be safe in multiple studies and is already used therapeutically in some countries. However, this particular brain injury prevention application needs human clinical trials before widespread use.

What concentration of hydrogen gas was used in this brain injury study?

The researchers used 1.3% hydrogen gas mixed with air during the 90-minute exercise period. This concentration was delivered directly into the chamber where the mice exercised.

Hydrogen Gas Protects Brain From Sports-Related Head Injuries in Mice

Authors: Masaya Nakagawa, Satoshi Tomura, Terushige Toyooka, Kazuya Fujii, Arata Tomiyama, Kojiro Wada
Journal: Journal of Neurotrauma
Year: 2026
DOI: 10.1177/08977151261432145
Study Type: Mouse
Outcome: Positive
Peer Reviewed: Yes
Country: Japan
Health Condition: Traumatic Brain Injury
Body System: Nervous System

TL;DR

Hydrogen preconditioning before traumatic brain injury reduced oxidative stress, brain edema, and blood–brain barrier disruption in a mouse model with exercise-induced stress.

Key Finding

Hydrogen gas preconditioning reduced brain swelling and oxidative stress markers while boosting the brain's natural antioxidant defenses for up to 24 hours after traumatic brain injury in mice.

Summary

This study tested whether breathing hydrogen gas before a head injury could protect the brain in mice. Researchers first exercised mice to create oxidative stress (cellular damage from unstable molecules), then gave them a controlled brain injury. Mice that breathed hydrogen gas before injury showed less brain swelling, lower levels of damage markers, and stronger natural antioxidant defenses compared to mice that didn't receive hydrogen. The protective effects lasted at least 24 hours even though hydrogen gas leaves the body within about an hour.

Practical Takeaway

This early-stage mouse study suggests hydrogen gas may help protect the brain from injury-related damage, particularly when oxidative stress is already elevated. However, this is animal research only—human studies would be needed to determine if these findings apply to people. The non-invasive nature of hydrogen gas delivery is notable, but much more research is required before any clinical recommendations could be made.

Abstract

Traumatic brain injury (TBI) affects approximately 1% of the global population annually. In Japan, sports-related head injuries are recognized as one of the most common causes. There have been reports suggesting that TBI sustained during sports activities may become more severe because of the added oxidative stress compared with injuries at rest, but there are still few reports on the actual changes in oxidative stress following TBI. Therefore, we first examined the changes in oxidative stress immediately post-sports-related TBI. No pharmacological treatment has been established to effectively prevent TBI, and preconditioning approaches aimed at enhancing endogenous tolerance prior to injury have attracted attention. However, existing methods often involve invasive procedures, limiting their clinical applicability. Prior studies demonstrated the therapeutic potential of hydrogen gas, which possesses antioxidant properties in TBI. Therefore, we examined whether hydrogen administration prior to TBI could attenuate secondary brain injury in a model incorporating exercise-induced oxidative stress before trauma. Male C57BL/6 mice (6 weeks old) were subjected to treadmill exercise at 15 m/min for 90 min to induce oxidative stress. During exercise, 1.3% hydrogen gas was delivered into the chamber for preconditioning. Moderate TBI was induced using a controlled cortical impact (CCI) device immediately postexercise. Four groups were evaluated: resting controls, exercise alone, exercise followed by TBI induced by CCI (ExCCI), and hydrogen-preconditioned exercise followed by TBI. Oxidative stress was assessed using hippocampal malondialdehyde (MDA) levels, and antioxidant capacity was evaluated using manganese superoxide dismutase (MnSOD) activity. Brain edema was quantified using brain water content, and vasogenic edema was assessed using Evans Blue extravasation. Histological analysis of the pericontusional cortex included glial fibrillary acidic protein (GFAP) and aquaporin-4 (AQP4) immunofluorescence. MDA levels increased 3 h postexercise and remained elevated for 24 h when TBI was induced. Hydrogen preconditioning significantly reduced MDA levels and enhanced MnSOD activity, which peaked 24 h postinjury. At the same time point, ExCCI mice showed significant brain and vasogenic edema, both of which were attenuated by hydrogen. GFAP and AQP4 were increased in ExCCI mice and suppressed by hydrogen. Although hydrogen is known to disappear from the blood within approximately 1 h postinhalation, MnSOD activity remained elevated for up to 24 h postinjury, indicating endogenous antioxidant defense activation. Hydrogen is considered to mitigate blood-brain barrier vulnerability to oxidative stress, thereby reducing vasogenic edema. These findings indicate that hydrogen gas may be effective as a treatment and a preventive intervention for TBI.