HIIT and MICT on Nitric Oxide-mediated Erythrocyte Rheology

March 26, 2021 updated by: Jong-Shyan Wang, Chang Gung Memorial Hospital

Effects of High Intensity Interval Training and Moderate Intensity Continuous Training on Nitric Oxide-mediated Erythrocyte Rheology

Erythrocyte rheological properties affect blood viscoelasticity and consequently regulate vascular resistance to flow shear force, whereas rheological impairments of erythrocytes may result in circulatory disorders. The aim of this study was to establish an effective exercise strategy for improving individual aerobic capacity and for simultaneously ameliorating the risk of hemorheological dysfunction evoked by a graded exercise test (GXT) and the hypotheses is exercise intervention will improved hemorheological functions by enhancing deformability of erythrocytes via NO-mediated mechanism. This study included 60 healthy sedentary mens (age 20~30) from Chang Gung university than were randomized into the HIIT [3-min intervals at 40% and 80% V̇O2 reserve (V̇O2R),n=10] and MICT(sustained 60% V̇O2R,n=10)on a bicycle ergometer for 30min·d-1, 5 d·wk-1 for 6 wk.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

Recently, the role of erythrocyte has been more emphasized, which also related with endothelial cell. For coronary artery patients, the endothelial nitric oxide synthase activity in red blood cell (RBC-eNOS activity) is lower than age-matched health people, and it is related with dysfunction of endothelial cell. In cardiovascular diseases. the erythrocyte arginase-1 is active and seize L-arginine with eNOS. When the Arg-1 stimulated by reactive oxygen species (ROS), the nitric oxide (NO) bioactivity decrease and produce more ROS, meanwhile, ROS can go around to stimulate Arg-1. When the RBC-NO production is lowering, it will increase the adhesion activity to endothelial cell due to erythrocyte can be quite close to blood vessel well then release Nitric Oxide, induce the dysfunction and oxidative pressure of endothelial cell. The NO can also regulate the deformability of erythrocytes, and extremely affect oxygen supply to tissue once the deformability and aggregation of erythrocyte become abnormal. Besides NO, the deformability will be affected if erythrocyte is continuously exposed to the endogenous or exogenous ROS, which also increase adhesion to endothelial cell with the exposure of phosphatidylserine. Exercise can regulate the mechanism of NO release from erythrocyte, affecting the rheology of erythrocyte, and improve the anti-oxidation ability. Therefore, as mentioned above which make erythrocyte, as many aspects, become an important role on atherosclerosis disease treatment.

Study Type

Interventional

Enrollment (Anticipated)

60

Phase

  • 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

  • Taiwan
      • Taoyuan, Taiwan, 333
        • Recruiting
        • Chang Gung University

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

Ages Eligible for Study

20 years to 30 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Male

Description

Inclusion Criteria:

  • Having a sedentary lifestyle (without regular exercise, exercise frequency ≤ once weekly, duration < 20 min).

Exclusion Criteria:

  • Exposed to high altitudes (> 3000 m) for at least 1 year.
  • Smoker
  • Taking medications or vitamins
  • Having any cardiopulmonary/hematological risk.

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: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: High intensity-interval training (HIIT)
Subjects performed HIIT (3-min intervals at 40% and 80%VO2peak) on a bicycle ergometer for 30 min/day, 5 days/week for 6 weeks.
Behavioral: High intensity-interval training (HIIT)

Subjects performed HIIT (3-min intervals at 40% and 80%VO2peak) on a bicycle ergometer for 30 min/day, 5 days/week for 6 weeks.

Without any exercise training
No Intervention: Control group
Without any exercise training
Experimental: Moderate intensity-continuous (MICT)
Subjects performed MICT (sustained 60%VO 2max) on a bicycle ergometer for 30 min/day, 5 days/week for 6 weeks.
Behavioral: Moderate intensity-continuous (MICT)
Subjects performed MICT (sustained 60%VO 2max) on a bicycle ergometer for 30 min/day, 5 days/week for 6 weeks.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Intracellular NO production response to exercise training.
Time Frame: 8 weeks
Added different inhibitors or agonists to investigate the effects of exercise training on NO production mediated by eNOS-NO pathway.
8 weeks
Intracellular ROS production response to exercise training.
Time Frame: 8 weeks
Added different inhibitors or agonists to investigate the effects of exercise training on ROS production mediated by eNOS-NO pathway.
8 weeks
The levels of eNOS, p-eNOS and Band-3 response to exercise training.
Time Frame: 8 weeks
Detect the following protein levels: eNOS, p-eNOS and Band-3, by the western blots.
8 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Determination of erythrocyte biological markers by Flow Cytometry
Time Frame: 8 weeks
Using the Flow Cytometry to detect the following markers: CD242, CD239, NADPH oxidase 2 (Nox2) and Arginase 1 (Arg1).
8 weeks
Erythrocyte deformability
Time Frame: 8 weeks
Isolated erythrocyte first, then assess erythrocyte deformability (elongation index ) by using laser assisted optical rotational red cell analyzer (LoRRca).
8 weeks
Cardiopulmonary fitness
Time Frame: 8 weeks
To assess cardiopulmonary fitness, cardiopulmonary exercise test (CPET) on a cycle ergometer was performed 4 days before and after the intervention. All subjects underwent exercise with a mask to measured oxygen consumption (VO2) breath by breath using a computer-based system.
8 weeks

Collaborators and Investigators

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

Sponsor

Chang Gung Memorial Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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)

March 5, 2021

Primary Completion (Anticipated)

September 4, 2021

Study Completion (Anticipated)

September 4, 2021

Study Registration Dates

First Submitted

February 26, 2021

First Submitted That Met QC Criteria

March 26, 2021

First Posted (Actual)

March 30, 2021

Study Record Updates

Last Update Posted (Actual)

March 30, 2021

Last Update Submitted That Met QC Criteria

March 26, 2021

Last Verified

March 1, 2021

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 202000448A3

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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