Acute Nerve Stimulation For Enhancing Human and Cognitive Performance

NCT05675956 | Completed

• 1 other identifier: Pro00122153
• Study Type: interventional
• Target: 35
• Locations: 1 country
• Sites: 1

Brief Summary

The goal of this clinical trial is to test a wearable device's effect on performance in tactical populations with a history of concussion. The main question it aims to answer is the effectiveness of the device on modulate physiological and cognitive function. The physiological function will be derived from metrics of heart rate variability and blood-based biomarkers, whilst human performance will be evaluated using tasks that assess cognitive domains of executive function, reaction time, and memory.

Conditions

Concussion, Mild; Autonomic Nervous System; Cognitive

Outcome Measures

Primary Outcomes (44)

• Changes in dopamine

  To determine if the device has an impact on dopamine levels

  Will be assessed at visits 2 and 3 prior exercise (minute 0) , immediately following exercise (about 1.5 hour), and immediately post one hour recovery (at about hour 3) on experimental visits.

• Changes in epinephrine

  To determine if the device has an impact on epinephrine levels

  Will be assessed at visits 2 and 3 prior exercise (minute 0) , immediately following exercise (about 1.5 hour), and immediately post one hour recovery (at about hour 3) on experimental visits.

• Changes in norepinephrine

  To determine if the device has an impact on norepinephrine levels

  Will be assessed at visits 2 and 3 prior exercise (minute 0) , immediately following exercise (about 1.5 hour), and immediately post one hour recovery (at about hour 3) on experimental visits.

• Changes in cortisol

  To determine if the device has an impact on cortisol levels

  Will be assessed at visits 2 and 3 prior exercise (minute 0) , immediately following exercise (about 1.5 hour), and immediately post one hour recovery (at about hour 3) on experimental visits.

• Changes in arousal

  To determine if the device has an impact on arousal levels measured by the "Felt Arousal Scale". The minimum score is 1 and maximum score is 6. These measures are not indicative of better or worse outcomes.

  Will be assessed at visits 2 and 3 prior exercise (minute 0) on experimental visits.

• Sleep Quality

  Index of sleep quality using the Neurology Quality of Life (Neuro-QOL) sleep subscale.

  Will be assessed at visits 2 and 3 prior exercise (minute 0) on experimental visits.

• Changes in fatigue

  To determine if the device has an impact on fatigue levels measured by the "Fatigue Scale". The minimum score is 1 and maximum score is 5. These measures are not indicative of better or worse outcomes.

  Will be assessed prior exercise (minute 0), immediately after the bout of exercise (about hour 1.5), post cognitive testing (about 2 hour), and immediately post one hour recovery (about hour 3) on experimental visits.

• Changes in Marksmanship Accuracy

  Simulated marksmanship using optical targetry

  Will be assessed prior exercise (minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Marksmanship Reaction Time

  Simulated marksmanship using optical targetry

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in cognitive flexibility by local switch cost RT (Switch Task)

  To determine if the device has an impact on cognitive flexibility by measuring local switch cost RT within the heterogenous condition when switching rule sets represented as the additional time to respond to switch relative to repeat trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in cognitive flexibility by local switch cost ACC (Switch Task)

  To determine if the device has an impact on cognitive flexibility by measuring local switch cost ACC within the heterogenous condition when switching rule sets represented as the difference between error rates for switch relative to repeat trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in cognitive flexibility by local switch cost IES (Switch Task)

  To determine if the device has an impact on cognitive flexibility by measuring local switch cost inverse efficiency scores (IES) represented as dividing RTs by 1 minus the percentage of errors (i.e., percentage of correct responses).

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in global executive function by global cost RT (Switch Task)

  To determine if the device has an impact on global executive function by measuring global cost RT represented as the difference between the time required to respond between the heterogeneous and homogeneous conditions.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in global executive function by global cost ACC (Switch Task)

  To determine if the device has an impact on global executive function by measuring global cost ACC represented as the difference between error rates between homogeneous and heterogeneous conditions.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in global executive function by global cost IES (Switch Task)

  To determine if the device has an impact on global executive function by measuring global cost IES.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in working memory by mixing cost RT (Switch Task)

  To determine if the device has an impact on working memory by measuring mixing cost RT represented as the additional time required to respond between the repeat trials in the heterogenous condition relative to the trials in the homogeneous condition.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in working memory by mixing cost ACC (Switch Task)

  To determine if the device has an impact on working memory by measuring mixing cost ACC represented as the difference in error rates on repeat trials in the heterogenous condition relative to the trials in the homogeneous condition.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in working memory by mixing cost IES (Switch Task)

  To determine if the device has an impact on working memory by measuring mixing cost IES.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in attention (Switch Task)

  To determine if the device has an impact on attention measured by the omission errors when an individual fails to respond to a color-switch task trial, and omission error runs when an individual fails to respond to multiple successive trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Inhibitory Control (Switch Task)

  To determine if the device has an impact on inhibitory control measured by the commission errors when an individual fails to respond correctly to a color-switch task trial, and commission error runs when an individual fails to respond correctly to multiple successive trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in attention and cognitive control by ACC (Switch Task)

  To determine if the device has an impact on attention and cognitive control by measuring heterogeneous condition ACC.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in attention and cognitive control by RT (Switch Task)

  To determine if the device has an impact on attention and cognitive control by measuring heterogeneous condition RT.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in attention and cognitive control by IES (Switch Task)

  To determine if the device has an impact on attention and cognitive control by measuring heterogeneous condition IES.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Inhibitory Control (Go/No go)

  To determine if the device has an impact on inhibitory control by measuring reaction time to Go targets (hits). To determine if the device has an impact on inhibitory control by measuring errors of commission representing incorrect responses to the target NoGo (false alarm).

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Attention (Go/No go)

  To determine if the device has an impact on attention by measuring errors of omission to the target Go (misses).

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Autonomic Nervous System Function (ANS) by linear metrics

  To determine if the device has an impact on ANS function by measuring heart rate variability represented by linear (RMSSD, SDNN, CVNN) time domain metrics.

  This will be continuously assessed throughout the entirety of experimental visits 2 and 3 (minute 0 to about 3 hours)..

• Changes in Autonomic Nervous System Function (ANS) by nonlinear metrics

  To determine if the device has an impact on ANS function by measuring heart rate variability represented by nonlinear (ApSaEn) time domain metric.

  This will be continuously assessed throughout the entirety of experimental visits 2 and 3 (minute 0 to about 3 hours)..

• Changes in Autonomic Nervous System Function (ANS) by frequency domain metrics

  To determine if the device has an impact on ANS function by measuring heart rate variability represented by frequency domain (HF, LF, Coherence Ratio) metrics.

  This will be continuously assessed throughout the entirety of experimental visits 2 and 3 (minute 0 to about 3 hours)..

• Changes in Inhibitory Control by accuracy scores (Flanker Task)

  To determine if the device has an impact on inhibitory control measured by the accuracy scores (% of correct answers) for compatible-congruent, incompatible-congruent, compatible-incongruent, and incompatible-incongruent Flanker Task trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Inhibitory Control by average response time (Flanker Task)

  To determine if the device has an impact on inhibitory control measured by the average response time to incongruent flanker task trials irrespective of compatible or incompatible rule sets.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Inhibitory Control by commission errors (Flanker Task)

  To determine if the device has an impact on inhibitory control measured by the commission errors when an individual fails to respond correctly to a flanker task trial, and commission error runs when an individual fails to respond correctly to multiple successive trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Attention by accuracy (Flanker Task)

  To determine if the device has an impact on attention measured by the accuracy scores for congruent-compatible Flanker task trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Attention by average response time (Flanker Task)

  To determine if the device has an impact on attention measured by the overall average response time (milliseconds) to compatible and incompatible Flanker task trails irrespective of trial congruency.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Attention by omission errors (Flanker Task)

  To determine if the device has an impact on attention measured by the omission errors when an individual fails to respond to a flanker task trial, and omission error runs when an individual fails to respond to multiple successive trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Cognitive flexibility by accuracy (Flanker Task)

  To determine if the device has an impact on cognitive flexibility by the accuracy scores for incongruent-incompatible Flanker task trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Cognitive flexibility by average response time (Flanker Task)

  To determine if the device has an impact on cognitive flexibility measured by the average response time to incongruent-incompatible flanker task trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Cognitive control by post-error accuracy (Flanker Task)

  To determine if the device has an impact on cognitive control measured by post-error accuracy on Flanker task trials following an error.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Cognitive control by sequential congruency effect (Flanker Task)

  To determine changes in cognitive control measured by sequential congruency effect when lower interference occurs following an incongruent relative to a congruent flanker task trial reflecting a consciously controlled narrowing of attention to the central target.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Cognitive control by inverse efficiency (Flanker Task)

  To determine if the device has an impact on cognitive control measured by inverse efficiency a metric of a speed-accuracy trade-off for Flanker task trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in Attentional Inhibition (Flanker Task)

  To determine if the device has an impact on attentional inhibition measured by congruency interference representing the costs associated with the interference demands associated with incongruent vs congruent flanker task trials.

  Will be assessed prior exercise (about minute 30) and immediately following the bout of exercise (about hour 1.5) on experimental visits.

• Changes in verbal learning (HVLT)

  To determine if the device has an impact on verbal learning by measuring total recall score via combining the word recall score from the three trials.

  Will be assessed prior exercise (about minute 30), immediately following the bout of exercise (about 1.5 hours), and immediately post one hour recovery (about hour 3) on experimental visits.

• Changes in memory recall (HVLT)

  To determine if the device has an impact on memory by measuring delayed recall via the delayed recall score.

  Will be assessed prior exercise (about minute 30), immediately following the bout of exercise (about 1.5 hours), and immediately post one hour recovery (about hour 3) on experimental visits.

• Changes in retention (HVLT)

  To determine if the device has an impact on memory by measuring retention via dividing the delayed recall trial by the score obtained on the trial prior exercise.

  Will be assessed prior exercise (about minute 30), immediately following the bout of exercise (about 1.5 hours), and immediately post one hour recovery (about hour 3) on experimental visits.

• Changes in memory retention (HVLT)

  To determine if the device has an impact on memory by measuring retention via calculating a retention discrimination index by subtracting the total number of false positives from the total number of true positives.

  Immediately post one hour recovery (hour 3) on experimental visits.

Study Arms (2)

High Intensity

EXPERIMENTAL

The device will be set to 100% intensity for this group.

Device: Experimental group with 100% intensity setting on Apollo Neuro device

Low Intensity

ACTIVE COMPARATOR

The device will be set to 10% intensity in this group

Device: Active Comparator group with 10% intensity setting on the Apollo Neuro device

Interventions

Experimental group with 100% intensity setting on Apollo Neuro device DEVICE

The group will have the device set to 100% intensity at one of their two experimental visits.

High Intensity

Active Comparator group with 10% intensity setting on the Apollo Neuro device DEVICE

The group will have the device set to 10% intensity at one of their two experimental visits.

Low Intensity

Eligibility Criteria

• Age: 18 Years - 35 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Participant is between 18-30 BMI.
• Participant needs to be either an ROTC member, currently employed military or law enforcement officer or are a military veteran or retired law enforcement officer who has completed service in the past 18 months.
• Participant has provided written and dated informed consent.
• Participant is in good health and able to participate in high-intensity exercise.
• Participant have been clinically diagnosed with a concussion at least 3 months prior to screening and is asymptomatic.
• Participant is willing to maintain their current dietary supplement usage through the duration of the study. If the participant began taking another supplement within the past month, the participant will be asked to discontinue supplement use followed by a 2-week washout prior to participation.

You may not qualify if:

• Participant with any musculoskeletal injuries that would prevent exercising.
• Participant with any metabolic disorder including known electrolyte abnormalities, diabetes, thyroid disease, adrenal disease or hypogonadism.
• Participant with a history of hepatorenal, musculoskeletal, or autoimmune disease.
• Participant currently taking medication that affects the ANS such as thyroid, hyperlipidemic, hypoglycemic, anti-hypertensive, anticoagulant, or psychotropic medications, or antihistamines.
• Participant who is pregnant or lactating.
• Participant with any of the following concussion characteristics; history of \>3 concussions, loss of consciousness (\>5 minutes), cause of injury related to violence e.g. physical altercations.
• Participants with a history of moderate to severe TBI.

Sponsors & Collaborators

• University of South Carolina: lead

Study Sites (1)

University of South Carolina Sport Science Lab

Columbia, South Carolina, 29208, United States

Location

MeSH Terms

Conditions

Brain Concussion

Condition Hierarchy (Ancestors)

Brain Injuries, Traumatic; Brain Injuries; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Craniocerebral Trauma; Trauma, Nervous System; Head Injuries, Closed; Wounds and Injuries; Wounds, Nonpenetrating

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Masking Details: This will be a single-blind study, the investigators will know which condition subjects are assigned at which visit.
• Purpose: OTHER
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Model Details: Participants will participate in both arms of the intervention.

Study Record Dates

• First Submitted: November 2, 2022
• First Posted: January 9, 2023
• Study Start: January 15, 2023
• Primary Completion: March 27, 2024
• Study Completion: March 27, 2024
• Last Updated: March 28, 2024

Record last verified: 2024-03

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)