- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04624152
The Role of Hypoxia on Subconcussive Head Impacts
The Combined Effects of Hypoxia and Subconcussive Head Impacts on Neurocognitive Function: a Pilot Randomized Crossover Study
Study Overview
Detailed Description
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Indiana
-
Bloomington, Indiana, United States, 47405
- Indiana University
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Between 18 and 26 years old
- Current or former soccer player (i.e., collegiate, intramural, club, professional)
- At least 3 years of soccer heading experience
- Participants can read and speak English
- Participants have cell phone or computer with internet access to schedule for follow-up visits via email or text message
- Participant is willing to refrain from participating in any sport activity that purposefully uses one's head to maneuver (American football, ice-hockey, rugby, wrestling, and soccer heading) during study participation
Exclusion Criteria:
- Any head, neck, or face injury in the 1 year prior to the study (e.g., concussion, eye injury)
- History of vestibular, ocular, or vision dysfunction (e.g., macular degeneration)
- Currently taking any medications that trigger drowsiness
- Pregnancy
- Any history of neurological disorders (e.g., seizure disorders, closed head injuries with loss of consciousness greater than 15 minutes, CNS neoplasm, spinal cord injury/surgery, history of stroke)
- Lower extremity injury that would prohibit normal walking
- Metal implants in the head
Conditional Exclusion Criteria
Based on participants' self report: those who meet any of the following criteria, he/she will be either excluded or rescheduled (if they still wish to participate in the study):
- Slept less than 4 hours during the night prior to the testing day
- Consumed more than 3 alcoholic drinks within 24h prior to testing
- Used recreational drugs 24h prior to the testing day
- Consumed more than 300 mg of caffeine (the equivalent of about 3 cups of coffee) within 1h before testing sessions
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Normobaric Hypoxia
Large weather balloons will be filled with a normobaric hypoxic inspirate (FiO2 = 0.15) produced by a nitrogen generator (CAT 12; Colorado Altitude Training, Boulder, CO) to simulate an altitude of 2600 m (8500 ft). Participants breathed this inspirate through a two-way non-rebreathing valve (2700; Hans Rudolph, Kansas City, KS) and an oronasal mask (7450 V2; Hans Rudolph, Kansas City, KS). Participants breathed this inspirate from 15 minutes before the pre-heading time point until the conclusion of the 0h post-heading time point. |
A standardized and reliable soccer heading protocol will be used to induce subconcussive impacts for the experiment.
A triaxial accelerometer (Triax Technologies, Norwalk, CT) embedded in a head-band pocket and positioned back of the head to monitor linear and rotational head accelerations.
A JUGS soccer machine (JUGS Sports, Tualatin, OR) will be used to simulate a soccer throw-in with a standardized ball speed of 25 mph across all groups.
The ball speed is similar to when soccer players make a long throw-in from the sideline to mid-field.
Soccer players frequently perform this maneuver during practices and games.
Participants will stand approximately 40ft away from the machine to perform the heading.
Participants will perform a total of 10 headers at a rate of 1 header per minute and will be instructed to direct the ball back towards the JUGS machine.
Previous uses of this soccer heading model have reported an average peak linear acceleration per header of 14.5 to 33.5 g.
|
Placebo Comparator: Normobaric Normoxia
Large weather balloons will be filled with room air (FiO2 = 0.21). Participants breathed this normobaric normoxic inspirate through a two-way non-rebreathing valve (2700; Hans Rudolph, Kansas City, KS) and an oronasal mask (7450 V2; Hans Rudolph, Kansas City, KS). Participants breathed this inspirate from 15 minutes before the pre-heading time point until the conclusion of the 0h post-heading time point. |
A standardized and reliable soccer heading protocol will be used to induce subconcussive impacts for the experiment.
A triaxial accelerometer (Triax Technologies, Norwalk, CT) embedded in a head-band pocket and positioned back of the head to monitor linear and rotational head accelerations.
A JUGS soccer machine (JUGS Sports, Tualatin, OR) will be used to simulate a soccer throw-in with a standardized ball speed of 25 mph across all groups.
The ball speed is similar to when soccer players make a long throw-in from the sideline to mid-field.
Soccer players frequently perform this maneuver during practices and games.
Participants will stand approximately 40ft away from the machine to perform the heading.
Participants will perform a total of 10 headers at a rate of 1 header per minute and will be instructed to direct the ball back towards the JUGS machine.
Previous uses of this soccer heading model have reported an average peak linear acceleration per header of 14.5 to 33.5 g.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Acute change in neurocognitive function from pre-heading at 0 hour post-heading
Time Frame: Neurocognitive function will be assessed at pre- and 0 hour post-heading
|
Participants will complete a computerized neurocognitive assessment (Immediate Post-Concussion Assessment and Cognitive Testing).
|
Neurocognitive function will be assessed at pre- and 0 hour post-heading
|
Acute change in convergence function from pre-heading at 0 hour post-heading
Time Frame: Conversion function will be assessed at pre- and 0 hour post-heading
|
Participants will undergo near-point of convergence (in centimeter) to evaluate how closely one can visualize a moving target without double vision occurs.
|
Conversion function will be assessed at pre- and 0 hour post-heading
|
Acute change in brain-derived blood biomarkers from pre-heading at 0 hour post-heading
Time Frame: Blood samples will be collected at pre- and 0 hour post-heading
|
Blood samples will be collected and centrifuged at 1500 x g for ten minutes at 4 degree celsius. Plasma will be aliquoted and stored at -80 degree celsius until analysis. Plasma samples will be assayed for neurofilament-light (NfL), glial fibrillary acidic protein (GFAP), and tau. |
Blood samples will be collected at pre- and 0 hour post-heading
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in neurocognitive function at 24 hours post-heading follow-up
Time Frame: Neurocognitive function will also assessed at 24 hours post-heading
|
Upon their return to the laboratory, participants will again complete a computerized neurocognitive assessment (Immediate Post-Concussion Assessment and Cognitive Testing).
|
Neurocognitive function will also assessed at 24 hours post-heading
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Change in ocular-motor function at 24 hours post-heading follow-up
Time Frame: Ocular-motor function will also assessed at 24 hours post-heading
|
Upon their return to the laboratory, participants will again undergo three ocular-motor assessments: 1) near-point of convergence; 2) King-Devick Test--a brief assessment of saccadic eye movements, attention, and visual and language processing; and 3) the EYE-SYNC smooth pursuit task.
|
Ocular-motor function will also assessed at 24 hours post-heading
|
Change in brain-derived blood biomarkers at 24 hours post-heading follow-up
Time Frame: A third blood sample will be collected at 24 hours post-heading
|
Blood samples will be collected and centrifuged at 1500 x g for ten minutes at 4 degree celsius. Plasma will be aliquoted and stored at -80 degree celsius until analysis. Plasma samples will be assayed for neurofilament-light (NfL), glial fibrillary acidic protein (GFAP), and tau. |
A third blood sample will be collected at 24 hours post-heading
|
Acute change in saccadic eye movement function from pre-heading at 0 and 24 hour post-heading
Time Frame: Saccadic eye movement function will be assessed at pre- , 0, and 24 hour post-heading
|
Participants will undergo King-Devick Test--a brief assessment of saccadic eye movements, attention, and visual and language processing
|
Saccadic eye movement function will be assessed at pre- , 0, and 24 hour post-heading
|
Acute change in smooth eye pursuit function from pre-heading at 0 and 24 hour post-heading
Time Frame: Smooth eye pursuit function will be assessed at pre- , 0, and 24 hour post-heading
|
Participants will undergo the EYE-SYNC smooth pursuit task.
|
Smooth eye pursuit function will be assessed at pre- , 0, and 24 hour post-heading
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 1806106387
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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