Preventing Exercise Resistance With Sedentary Interruptions

NCT ID: NCT06277713

Last Updated: 2024-03-04

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 24 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-02-19
• Study Completion Date: 2025-07-01

Brief Summary

The goal of this randomised cross-over trial is to learn about the interaction between sedentary behaviour throughout the day and the metabolic effect of an exercise bout on that same day in office workers with an increased risk for chronic disease.

The main question this study aims to answer is if the lipid-lowering effects of an exercise bout can be more pronounced by implementing alternations between a seated and a standing working position throughout the day.

Participants will be asked to:

• Complete three intervention periods for a duration of 2 days at their workplace,
• Attend a supervised training session (60min) at the research facility at the end of each intervention period,
• Attend three assessment days at the research facility where postprandial metabolism will be evaluated after a standardised meal test.

Detailed Description

The World Health Organisation recently published guidelines with physical activity recommendations that serve to promote healthy lifestyles and thus can help reduce the risk of chronic diseases. In these, they also included for the first time that sedentary behaviour (e.g. sedentary work, driving a car, ...) should be reduced as much as possible since there are clear links between a sedentary lifestyle and negative health effects.

However, WHO also indicates that more research is needed to investigate the health effects of interactions between planned physical activity and sedentary behaviour. This is of even greater importance as there are now some studies indicating that the acute effects of an exercise session are greatly reduced when combined with prolonged sitting throughout the day. This new insight has been labelled as sitting-induced exercise resistance. This study aims to investigate whether it is possible to reduce sitting behaviour by moving more and optimally preserve the effects of a training session.

This study will evaluate how the combination of sitting behaviour and a training session affects certain health parameters. Indeed, prolonged sitting leads to an increased risk of poor cardiometabolic health and consequently an increased risk of developing conditions such as diabetes and cardiovascular disease. Recent research shows that interrupting prolonged sitting can largely prevent some adverse effects on cardiometabolic health. Furthermore, it also shows that the positive effects of an exercise session are greatly reduced when this workout is scheduled on a day that was otherwise spent mainly sitting.

Previous research shows that interrupting sitting behaviour after 20 minutes by short-term (2min) exercise at light intensity would be optimal to improve glucose metabolism. However, this pattern is not very practical to apply in a work environment. For this, installing sit-stand desks could be a solution, as it seems that introducing such sit-stand desks in a work environment could cost-effectively reduce the risk of developing a number of chronic diseases by reducing sitting time. In this study, the effects on postprandial lipemia of reducing prolonged sitting time by introducing sit-stand desks and an exercise bout will be evaluated.

Conditions

Sedentary Behavior; Lipid Metabolism Disorder; Exercise

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: PREVENTION
• Blinding Strategy: SINGLE

Study Groups

Exercise after prolonged sitting (SIT)

All participants will be instructed to complete two working days (8h) where they perform seated desk-work throughout the day. At the end of the second day, they will perform a supervised exercise bout at the research facility.

Group Type: ACTIVE_COMPARATOR

Exercise bout

Intervention Type: BEHAVIORAL

Participants will perform a continuous aerobic exercise bout for a duration of 60 minutes at a moderate intensity, which is defined as 60% of their maximal oxygen uptake (VO2max).

Sedentary

Intervention Type: BEHAVIORAL

Participants are instructed to minimise any behaviour that is not sedentary during two working days (8h).

Exercise after sitting with standing breaks (WBR)

All participants will be instructed to complete two working days (8h) where they alternate seated desk-work with standing desk-work hourly throughout the day. At the end of the second day, they will perform a supervised exercise bout at the research facility.

Group Type: EXPERIMENTAL

Standing interruptions

Intervention Type: BEHAVIORAL

A mobile sit-to-stand desk will be installed at the workplace and participants are instructed to alternate their working position every 30 minutes during two working days (8h).

Exercise bout

Intervention Type: BEHAVIORAL

Participants will perform a continuous aerobic exercise bout for a duration of 60 minutes at a moderate intensity, which is defined as 60% of their maximal oxygen uptake (VO2max).

Non-exercise control (NEX)

In this control group all participants will be instructed to complete two working days (8h) where they perform seated desk-work throughout the day.

Group Type: OTHER

Sedentary

Intervention Type: BEHAVIORAL

Participants are instructed to minimise any behaviour that is not sedentary during two working days (8h).

Interventions

Standing interruptions

A mobile sit-to-stand desk will be installed at the workplace and participants are instructed to alternate their working position every 30 minutes during two working days (8h).

Intervention Type: BEHAVIORAL

Exercise bout

Participants will perform a continuous aerobic exercise bout for a duration of 60 minutes at a moderate intensity, which is defined as 60% of their maximal oxygen uptake (VO2max).

Intervention Type: BEHAVIORAL

Sedentary

Participants are instructed to minimise any behaviour that is not sedentary during two working days (8h).

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

• between 30 and 65 years old,
• primarily work in an office environment for at least 0.75 full time equivalents,
• sedentary (on average >9h of sedentary time per day, assessed objectively),
• at an increased risk for disturbances in lipid profile (assessed with fingerstick (Analox®) total cholesterol >200 mg/dL or fingerstick triglycerides >150 mg/dL),
• written informed consent to participate in the study.

Exclusion Criteria

• medical conditions precluding physical activity (PA) participation,
• abusive alcohol intake (>20 units/week),
• pregnant or intention to become pregnant,
• change in dietary habits or weight loss (>2kg) in the last month before the study,
• a diagnosis of cardiometabolic diseases such as diabetes mellitus or cardiovascular diseases.

• Minimum Eligible Age: 30 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Hasselt University

OTHER

Sponsor Role: lead

Responsible Party

Bert Op't Eijnde

Principal investigator

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Bert Op 't Eijnde, Prof. dr.

Role: PRINCIPAL_INVESTIGATOR

Hasselt University

Locations

Hasselt University

Diepenbeek, Limburg, Belgium

Site Status: RECRUITING

Countries

Belgium

Central Contacts

Bert Op 't Eijnde, Prof. dr.

Role: CONTACT

bert.opteijnde@uhasselt.be

+3211292121

Jen Vanherle, Drs.

Role: CONTACT

jen.vanherle@uhasselt.be

Facility Contacts

Bert Op 't Eijnde, Prof. dr.

Role: primary

bert.opteijnde@uhasselt.be

+3211292121

Jen Vanherle, Drs.

Role: backup

jen.vanherle@uhasselt.be

Other Identifiers

CME2023/069

Identifier Type: -

Identifier Source: org_study_id