Exercise Intensity and Postprandial Effects of Breaking Sedentary Behavior in Overweight Adults
Postprandial Cardiometabolic Effects of Interrupting Sedentary Behavior With Exercise of Varying Intensity in Healthy Overweight Adults
1 other identifier
interventional
16
1 country
1
Brief Summary
The purpose of this study is twofold: (1) to determine whether breaking up prolonged sitting with aerobic or sprint cycling breaks reduces postprandial blood glucose, insulin, CRP, and blood pressure, which are established risk markers for cardiometabolic diseases; and (2) to assess substrate oxidation during this period in order to identify which exercise condition promotes the greatest increase in fat oxidation.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at below P25 for not_applicable
Started Nov 2025
Shorter than P25 for not_applicable
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
Click on a node to explore related trials.
Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
September 24, 2025
CompletedFirst Posted
Study publicly available on registry
November 17, 2025
CompletedStudy Start
First participant enrolled
November 25, 2025
CompletedPrimary Completion
Last participant's last visit for primary outcome
April 25, 2026
CompletedStudy Completion
Last participant's last visit for all outcomes
June 15, 2026
ExpectedNovember 17, 2025
November 1, 2025
5 months
September 24, 2025
November 13, 2025
Conditions
Keywords
Outcome Measures
Primary Outcomes (1)
Insulin
Postprandial insulin. Net incremental area under the curve and total area under the curve for each 7 h condition will be calculated for insulin.
7 hour for each experimental condition
Secondary Outcomes (4)
Glucose
7 hour for each experimental condition
CRP
7 hour
Substrate oxidation
0, 2th, 5th, 7th hours
Blood pressure
7 hour
Study Arms (3)
Sedentary: Participants will remain seated for 7 h.
EXPERIMENTALThe sedentary condition will take place in a seated position. During the seated condition, volunteers will be seated at a typical desk chair at an appropriate height with hip and knee angles of \~90° and feet flat on the floor. The seating area will include a standard desk chair, a work desk, and the volunteers' personal laptops. Volunteers will be instructed prior to the visit to avoid behaviors such as fidgeting, excessive leg movements, and crossing their legs to minimize potential extraneous effects.
Breaking up sitting with aerobic exercise interruptions
EXPERIMENTALThe protocol that will interrupt sitting with AEI will involve cycle exercises performed at 50% of VO2max for 2 minutes. The W and rpm levels corresponding to 50% of VO2max will be determined using the values recorded during the determination of VO2max.
Breaking up sitting with sprint exercise interruptions
EXPERIMENTALThe protocol that will interrupt sitting with SEI will involve cycle exercises performed at the maximum revolutions per minute achievable within 10 seconds. Immediately before each SEI, volunteers will increase their pedal cadence to the maximum speed they can achieve, after which a pedal load will be applied to the bicycle ergometer and a sprint will be performed against the applied load for 10 seconds. During each sprint, the pedal load will be applied at 0.065 kilograms per kilogram of lean body mass. Since it has been shown to lead to greater peak power output in overweight and obese groups, lean body mass will be used as a reference when determining pedal load, rather than total body mass.
Interventions
In the aerobic exercise condition, participants will perform 2 minutes of moderate-intensity continuous cycling.
In the sprint condition, participants will complete a 10-second all-out sprint, as determined during the preliminary test.
Participants will remain seated for a total duration of 7 hours. During this period, they will be instructed to minimize excessive movement and will only be permitted to rise from the chair for voiding purposes.
Eligibility Criteria
You may qualify if:
- Being physically inactive (not doing at least 150 minutes/week of structured exercise).
- Having a physical activity level of \<5000 steps/day.
- Having a BMI between 25 and 29.9 kg/m2.
- Having a history of regular menstrual cycles for female participants.
- Having medical examination approval.
You may not qualify if:
- Taking any acute or chronic medication or supplement that may affect metabolism.
- Having an acute or chronic illness that limits exercise (musculoskeletal problems, cardiovascular disorders, respiratory problems, etc.).
- Consuming tobacco products.
- Meeting 3 or more of the metabolic syndrome criteria (waist circumference of 102 cm or more in men, 88 cm or more in women, triglyceride level of 150 mg/dL or higher, HDL cholesterol level below 40 mg/dL in men and 50 mg/dL in women, blood pressure of 130/85 mmHg or higher, fasting blood glucose level of 100 mg/dL (5.6 mg/L) or higher).
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
Hacettepe Sports Science Faculty, Hacettepe Beytepe Clinic
Ankara, Beytepe, Turkey (Türkiye)
Related Publications (51)
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PMID: 28599680BACKGROUND
MeSH Terms
Conditions
Condition Hierarchy (Ancestors)
Study Officials
- PRINCIPAL INVESTIGATOR
Şükran Nazan Koşar, Professor
Hacettepe University
Central Study Contacts
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- PREVENTION
- Intervention Model
- CROSSOVER
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- Associate Professor
Study Record Dates
First Submitted
September 24, 2025
First Posted
November 17, 2025
Study Start
November 25, 2025
Primary Completion
April 25, 2026
Study Completion (Estimated)
June 15, 2026
Last Updated
November 17, 2025
Record last verified: 2025-11
Data Sharing
- IPD Sharing
- Will not share
We do not plan to share IPD with other researchers due to privacy concerns and ethical restrictions outlined in the study's informed consent procedure.