Prehab-COG: Does Preoperative Exercise Improve Postoperative Cognitive Outcomes? (Prehab-COG)

November 9, 2026 updated by: Cindy Kin, Stanford University

Prehab-COG: Does Preoperative Exercise Improve Postoperative Cognitive Outcomes? A Pilot Study.

The purpose of this protocol is to evaluate the feasibility and acceptability of a preoperative exercise intervention (Prehabilitation) program, along with intraoperative Electroencephalography (EEG) recordings, and pre and post operative cognitive testing in older patients undergoing a major surgery.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
15

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Stanford, California, United States, 94305
        • Stanford Healthcare Centers

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

50 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Adults patients (50 years old or older).
  2. Scheduled to undergo non-cardiac or non-neurological surgery under general anesthesia.
  3. Plan to be admitted to the hospital after surgery for a minimum of one night.
  4. ASA physical status classification I to III.
  5. English or Spanish fluency (Cognitive testing only validated to be used with English or Spanish speakers).

Exclusion Criteria:

  1. Not able to understand/speak English or Spanish
  2. Failure to satisfy adequate hearing test with/without hearing aids.
  3. Visual impairment.
  4. Unplanned ICU admission after surgery.
  5. Patients who are undergoing another intervention study that consists of a cognitive or exercise intervention.
  6. Inability to provide consistent EEG data of sufficient quality, determined at enrollment.
  7. Subjects with medical conditions including but not limited to: Angina pectoris, Congestive Heart Failure (CHF) that make it dangerous for unsupervised physical activity, cognitive and psychiatric conditions that may affect ability to consent.
  8. Subjects who have contraindications to unsupervised exercise including but not limited to fall risks, movement disorders, and those who are on ambulatory oxygen therapy.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Moderate Exercise Arm

The participants will undergo the virtual exercise intervention 2xweek for 3-4 weeks prior to surgery, and take cognitive testing with non-invasive EEG recordings at 5-point time (the baseline prior to start of the exercise program, at 2-4 days prior to surgery, during the surgery, post-op, and 30-day post surgery). Participants will also be interviewed after the intervention and after surgery to obtain their feedback on their experience with the study procedures.
Behavioral: Tailored exercise program

Eligible participants will receive their exercise program, relevant informational material and training. The exercise program will be tailored to the physical fitness of the participants. The 2xweek virtual sessions take 30 minutes each and include guided exercises at mild-moderate intensity.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Evaluate the feasibility of a preoperative home-based exercise intervention program, with intraoperative EEG recording, and pre and post operative cognitive testing, among older patients undergoing major surgery.
Time Frame: Maximum 3 months from participant enrollment to end/completion of all study-related tasks.

Feasibility will be measured by:

  1. Proportion of Eligible Patients Approached Who Enrolled (Number of eligible patients who enrolled divided by the number of eligible patients approached)
  2. Proportion of Enrolled Participants Completing All Planned Study Data-Collection Assessments (Number and the percentage of the completion for each of the planned data collection points)
Maximum 3 months from participant enrollment to end/completion of all study-related tasks.
Evaluate the acceptability of a preoperative home-based exercise intervention program, with intraoperative EEG recording, and pre and post operative cognitive testing, among older patients undergoing major surgery.
Time Frame: Maximum 3 months from participant enrollment to end/completion of all study-related tasks.

Acceptability will be measured by:

1) Aggregated (mean) Score of Surveyed Participants' Rating Across Each Study-Task (Average score of participants' ratings across study tasks, including exercise program, EEG recording and cognitive testing).
Maximum 3 months from participant enrollment to end/completion of all study-related tasks.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Stanford University

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Cindy Kin, MD, Stanford University
  • Principal Investigator: Patrick Purdon, PhD, Stanford University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2027

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 30, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 9, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
November 12, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 12, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 9, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 85871

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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