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RHI Interval Effects on Brain Health

Defining the Role of Repetitive Head Impact Time Intervals in Mitigating Subconcussive Neural Injury

Who can join

Ages 18 to 35 · All sexes · Healthy volunteers welcome

Inclusion Criteria:

* Current soccer player (intercollegiate, club, intramural, recreational).
* At least 5 years of soccer heading experience (justification below).
* Ability to provide informed consent without a legally authorized representative (LAR).

Exclusion Criteria:

* Any head, neck, or face injury within the 6 months prior to enrollment, including concussions, that precludes participation in contact sports.
* Participants with eye conditions or diseases that could impact the blood vessels in the eye -such as but not limited to: glaucoma, macular degeneration, diabetic retinopathy.
* Determination that the participant is unsuitable for study entry or potentially unable to complete all aspects of the study based on the judgement of the Investigator.

About the study

Military service members frequently experience repetitive insults or impacts to the head (RHIs). The purpose of the proposed randomized controlled trial is to understand how time intervals affect neurological responses to repetitive subconcussive head impacts.

What is being tested

• Short Interval (other)
• Long Interval (other)
• BrainScope qEEG (device)

Sponsor: Indiana University · Participants: 102 · Started: Aug 5, 2025

Contact the study team

• Keisuke Kawata, PhD · Phone: 812-855-5244
• Blair Johnson, PhD · Phone: 812-855-8699

Official record on ClinicalTrials.gov — NCT07010887

Locations in the U.S.

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.