A CFit Study - Acute Exercise

April 27, 2021 updated by: Dr Zoe Saynor, University of Portsmouth

A CFit Study: To What Extent Does a Single Session of Exercise Training Influence Measures of Inflammation, Oxidative Stress, Nitric Oxide Bioavailability, Microvascular Endothelial Function and Dysglycaemia in Patients With Cystic Fibrosis?

A great medical success is the increase in the median survival age associated with cystic fibrosis (CF). However, this success has led to a new era of research aiming to maximise the quality of life (QoL) of the aging CF population. Over recent decades, exercise training has become an integral part of CF management by improving ones aerobic exercise function and QoL. However, the effects exercise training has upon other aspects of the disease, e.g. metabolic and vascular abnormalities, remains largely unknown.

The increased survival age associated with CF means the non-pulmonary co-morbidities are becoming increasingly prevalent and clinically important. For example, CF-related diabetes (CFRD) is one of the most common non-pulmonary co-morbidities of CF, and is associated with patients having a poorer pulmonary function and nutritional state, which ultimately leads to a worsened prognosis. Despite the efficacy of exercise training to manage dysglycaemia in other populations (e.g. type 2 diabetes mellitus only a single study has investigated its efficacy in patients with CF, whereby authors reported various encouraging findings (e.g. an improved OGTT score and insulin sensitivity).

The present study aims to build on previous trials by comparing the therapeutic effects of a single session of high-intensity interval exercise (HIIE) and moderate intensity exercise (MIE) upon the 24 hour, ambulatory glycaemic profile of patients with CF. Additionally, the present study will identify whether HIIE and/or MIE can mediate the consequences of transient hyperglycaemia when considering: biomarkers of inflammation, oxidative stress and nitric oxide (NO2) bioavailability, as well as functional measures of microvascular endothelial function.

The present study supports the top 10 research priorities set by the CF Trust, by further investigating the potential for exercise training to prevent/manage multiple aspects of CF, including dysglycaemia.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Terminated

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.

Detailed Description

Participants and recruitment The present study will be a pilot, counter-balanced, cross-over trial in individuals with CF (n = 16). Furthermore, the present protocol is an extension of the CFit_BL protocol (Clinical Trials ID to be confirmed). Specifically, 16 participants with CF will be invited to complete 2 visits (5 in total) within the same 14 day time period. Briefly, participants will be recruited from adult and paediatric CF outpatient clinics within the Southampton CF network, and will be tested at a laboratory within the Southampton General Hospital or the Department of Sport and Exercise Sciences (University of Portsmouth), depending on participant convenience.

The present study will comprise 2 visits which will be in a randomised, counter-balanced order.

Visits 1 and 2 A session of moderate intensity exercise (MIE) training and high-intensity interval exercise (HIIE) training visit will be conducted in a randomised, counter-balanced order. Participants will be required to arrive to the laboratory ~ 96 hours following the previous visit, at 0800 ± 2 hours, following an overnight fast (> 10 hours). Furthermore, participants will be instructed to avoid nitrate rich foods, caffeine, alcohol and exhaustive exercise for 24 hours prior to arrival, as well as mouthwash for the entirety of the study.

Upon arrival, CGM's will be fixed to the interior surface of the upper arm and worn for the subsequent 14 days. In addition to this, hip worn accelerometers, as well as hourly specific physical activity and food diaries will be distributed and completed for 14 days alongside the CGM.

Upon arrival participants will undergo the acetylcholine (ACh) and insulin iontophoresis protocols described below, including 5 resting blood pressure measurements and a cannula will be inserted into a vein by a trained phlebotomist, prior to the 3 hour OGTT and a baseline blood sample will be taken. The participant's pulmonary function will be assessed via spirometry. Participants will then be asked to complete either a single session of either MIE or HIIE.

Pulmonary function will then be assessed immediately post-exercise. 1 hour following exercise, the iontophoresis procedures will be repeated. Blood samples will be drawn immediately pre- and post-exercise for the analysis of plasma TNF-α, soluble vascular cell adhesion molecule (sVCAM)-1, IL-6, [NO-(₂)] and ET-1. Samples for nitrotyrosine (NT), total glutathione (tGSH) and total cysteine (tCys) will be drawn pre-exercise only. Subsequently, participants will partake in either 30 minutes of MIE or a work-matched period of HIIE. Thirty minutes following the completion of the exercising procedures, the iontophoresis procedures will be repeated and blood samples will be drawn for the analysis of plasma glucose, insulin, TNF-α, sVCAM-1, IL-6, [NO-(₂)] and ET-1. NT, tGSH and tCys. Following this, 1.75 g/kg body mass (maximum of 75 g) of anhydrous glucose will be consumed to instigate the 3 hour OGTT, whereby blood samples will be drawn at 30, 60, 90, 120 and 180 minutes post-glucose ingestion for the analysis of glucose and insulin. Samples for TNF-α, sVCAM-1, IL-6, [NO-(₂)] and ET-1 will be drawn at 60, 120 and 180 minutes post-glucose ingestion. NT, tGSH and tCys will be analysed at 120 minutes post-glucose ingestion. The total volume of blood collected over each 5 hour visit will be approximately 232 mL. Additionally, the iontophoresis procedures will be repeated at 30, 90 and 150 minutes post-glucose ingestion.

Follow-up CGM's, accelerometers and physical activity/food diaries will be completed throughout this 14 day period. A member of the research team will collect these from the preferred location of the participant.

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 (Actual)

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.
2

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 Kingdom
    • Hampshire
      • Portsmouth, Hampshire, United Kingdom, PO1 2ER
        • Department of Sport and Exercise Science

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

12 years and older (Child, Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Males and females ≥ 12 years of age
  • CF diagnosis based on clinical features, supported by an abnormal sweat test (sweat chloride > 60 mmol·L-1 > 100 mg sweat) and, where possible, diagnostic genotyping
  • No contraindications to performing exhaustive exercise
  • Can understand and cooperate with the study protocol
  • No increase in symptoms or weight loss in the preceding 2 weeks

Exclusion Criteria:

  • Any non-pulmonary conditions that may impair exercise ability, such as musculoskeletal disorders (arthritis, joint or muscle disease) and cardiovascular disease (congenital heart disease or cardiomyopathy).
  • Unstable co-morbid asthma (daily pulmonary function variability of > 20%)
  • Is pregnant during the initial screening process
  • Unable to understand or cooperate with the study protocol due to learning difficulties or otherwise
  • Not of a suitable age for testing

Exclusion during testing:

  • Onset of acute infection
  • Becomes and/or is tested to be pregnant following enrolment to the study
  • Experiences significant hypoxaemia during visit 2 of the CFit_BL protocol (IRAS ID: 225310) which requires supplemental O₂. Under these circumstances, participants will be invited to continue their participation under the CFit_BL trial (IRAS ID: 225310)
  • Unable to understand or cooperate with study protocol
  • The individual does not wish to participate further

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Crossover 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 vs. High-intensity exercise (randomised)
Compare the effects of a single session of moderate continuous exercise versus high-intensity interval exercise (MIE completed first)
Other: MIE

The moderate intensity exercise (MIE) condition will begin and end with an appropriate warm-up (3 minutes at 20 W) and cool-down (2 minutes at 20 W), respectively. Throughout all exercising procedures, participants will maintain a pedal cadence of 60-80 rpm, with the average being noted and kept consistent between trials. Additionally, verbal encouragement will be given depending on the participant's preference, and kept consistent between visits.

The MIE bout will be in coherence with the physical activity guidelines for people with CF (150 min/week of moderate to vigorous physical activity). For the MIE, participants will cycle for approximately 30 minutes at 90% of their gas exchange threshold.

Other: HIIE

The high-intensity interval exercise (HIIE) condition will begin and end with an appropriate warm-up (3 minutes at 20 W) and cool-down (2 minutes at 20 W), respectively. Throughout all exercising procedures, participants will maintain a pedal cadence of 60-80 rpm, with the average being noted and kept consistent between trials. Additionally, verbal encouragement will be given depending on the participant's preference, and kept consistent between visits.

The HIIE will be matched for the projected work done during the MIE. The HIIE protocol has been extrapolated from recent reports which have shown improvements in glycaemic control and vascular endothelial function. Specifically, participants will cycle at 90% of their peak power output for 60 seconds, followed by 60 seconds of active recovery.
Experimental: High-intensity vs. Moderate intensity exercise (randomised)
Compare the effects of a single session of moderate continuous exercise versus high-intensity interval exercise (HIIE completed first)
Other: MIE

The moderate intensity exercise (MIE) condition will begin and end with an appropriate warm-up (3 minutes at 20 W) and cool-down (2 minutes at 20 W), respectively. Throughout all exercising procedures, participants will maintain a pedal cadence of 60-80 rpm, with the average being noted and kept consistent between trials. Additionally, verbal encouragement will be given depending on the participant's preference, and kept consistent between visits.

The MIE bout will be in coherence with the physical activity guidelines for people with CF (150 min/week of moderate to vigorous physical activity). For the MIE, participants will cycle for approximately 30 minutes at 90% of their gas exchange threshold.

Other: HIIE

The high-intensity interval exercise (HIIE) condition will begin and end with an appropriate warm-up (3 minutes at 20 W) and cool-down (2 minutes at 20 W), respectively. Throughout all exercising procedures, participants will maintain a pedal cadence of 60-80 rpm, with the average being noted and kept consistent between trials. Additionally, verbal encouragement will be given depending on the participant's preference, and kept consistent between visits.

The HIIE will be matched for the projected work done during the MIE. The HIIE protocol has been extrapolated from recent reports which have shown improvements in glycaemic control and vascular endothelial function. Specifically, participants will cycle at 90% of their peak power output for 60 seconds, followed by 60 seconds of active recovery.

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
Glucose concentration before and after oral glucose tolerance test
Time Frame: Visit 1 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion), Visit 2 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion)
Glucose concentration before and after oral glucose tolerance test (which follows an exercise training session)
Visit 1 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion), Visit 2 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion)
Insulin concentration before and after oral glucose tolerance tolerance
Time Frame: Visit 1 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion), Visit 2 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion)
Insulin concentration before and after oral glucose tolerance test (which follows an exercise training session)
Visit 1 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion), Visit 2 (pre glucose ingestion after exercise completed and 30, 60, 90, 120 and 180 minutes following glucose ingestion)
Glycaemic control (measured using arm-mounted Freestyle Libre continuous glucose monitor)
Time Frame: Continuous measurement through study completion (2 week period)
Glycaemic control fixed to the arm will measure glucose excursions continuously
Continuous measurement through study completion (2 week period)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Nitrotyrosine (NT)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and 1 h following exercise 75 g glucose is ingested: NT measured immediately before glucose ingestion and 120 minutes after
Nitrotyrosine (NT) measured from plasma
Visit 1 and 2: pre-exercise (baseline) and 1 h following exercise 75 g glucose is ingested: NT measured immediately before glucose ingestion and 120 minutes after
Total cysteine (tCys)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and 1 h following exercise 75 g glucose is ingested: tCys measured immediately before glucose ingestion and 120 minutes after
Total cysteine (tCys) measured from plasma
Visit 1 and 2: pre-exercise (baseline) and 1 h following exercise 75 g glucose is ingested: tCys measured immediately before glucose ingestion and 120 minutes after
Total glutathione (tGSH)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and 1 h following exercise 75 g glucose is ingested: tGSH measured immediately before glucose ingestion and 120 minutes after
Total glutathione (tGSH) measured from plasma
Visit 1 and 2: pre-exercise (baseline) and 1 h following exercise 75 g glucose is ingested: tGSH measured immediately before glucose ingestion and 120 minutes after
Tumor necrosis factor alpha (TNF-alpha)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: TNF-alpha measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Tumor necrosis factor alpha (TNF-alpha) measured from plasma
Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: TNF-alpha measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Soluble vascular cell adhesion molecule (sVCAM-1)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: sVCAM-1 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Soluble vascular cell adhesion molecule-1 (sVCAM-1) measured from plasma
Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: sVCAM-1 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Endothelin-1 (ET-1)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: ET-1 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Endothelin-1 (ET-1)
Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: ET-1 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Interleukin-6 (IL-6)
Time Frame: Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: IL-6 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Interleukin-6 (IL-6)
Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: IL-6 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
[Nitrite] ([NO2])
Time Frame: Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: NO2 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
[Nitrite] ([NO2])measured from plasma
Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: NO2 measured immediately before glucose ingestion and 60, 120 and 180 minutes after)
Pulmonary function (forced expiratory volume in 1 second, forced vital capacity, peaf expiratory flow and mid-forced expiratory flow) measured using flow-volume loop spirometry
Time Frame: Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: pulmonary function measured immediately before glucose ingestion
Pulmonary function will be measured using flow-volume spirometry and presented in both absolute units and as a percentage of predictive normative reference values
Visit 1 and 2: pre-exercise (baseline) and immediately post-exercise, additionally 1 h following exercise 75 g glucose is ingested: pulmonary function measured immediately before glucose ingestion
Insulin iontophoresis
Time Frame: Visit 1 and 2: pre-exercise (baseline), additionally 1 h following exercise 75 g glucose is ingested: insulin iontophoresis measured immediately before glucose ingestion and 1, 2 and 3 hours after.
Insulin iontophoresis measures of microvascular endothelial function
Visit 1 and 2: pre-exercise (baseline), additionally 1 h following exercise 75 g glucose is ingested: insulin iontophoresis measured immediately before glucose ingestion and 1, 2 and 3 hours after.
Acetylcholine iontophoresis
Time Frame: Visit 1 and 2: pre-exercise (baseline), additionally 1 h following exercise 75 g glucose is ingested: acetylcholine iontophoresis measured immediately before glucose ingestion and 1, 2 and 3 hours after.
Acetylcholine iontophoresis measures of microvascular endothelial function
Visit 1 and 2: pre-exercise (baseline), additionally 1 h following exercise 75 g glucose is ingested: acetylcholine iontophoresis measured immediately before glucose ingestion and 1, 2 and 3 hours after.
Dietary intake
Time Frame: Continuous measurement through study completion (2 weeks), participants will record everything that they eat and drink
Dietary intake measured using MyFitness Pal application and dietary records
Continuous measurement through study completion (2 weeks), participants will record everything that they eat and drink
Physical activity
Time Frame: Continuous measurement through study completion (2 week period)
Physical activity measured using wrist worn accelerometer (GeneActiv)
Continuous measurement through study completion (2 week period)

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.
University of Portsmouth

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
University Hospital Southampton NHS Foundation Trust
Loughborough University
Queen Alexandra Hospital, Portsmouth

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 (Actual)

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.
May 1, 2018

Primary Completion (Actual)

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.
December 1, 2020

Study Completion (Actual)

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.
December 1, 2020

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).
July 26, 2017

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.
July 28, 2017

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.
August 3, 2017

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.
April 28, 2021

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.
April 27, 2021

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.
April 1, 2021

More Information

Terms related to this study

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.
  • ZS003

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Data will be shared with the research team only.

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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