AzTrials
AzTrials

Cardiovascular Risk MarkersNCT07229963

Exercise Intensity and Postprandial Effects of Breaking Sedentary Behavior in Overweight Adults

A study testing Aerobic Exercise Intervention, Sprint Exercise Intervention and Sedentary Behaviour Intervention in people with Cardiovascular Risk Markers and Postprandial Metabolism, run by Hacettepe University at 1 site in Turkey (Türkiye).

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
Search all trials

Trial 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… Read more about this study

Who is it for?
Ages 30 to 45 yearsHealthy volunteers can take part
What is being tested?
Aerobic Exercise Intervention, Sprint Exercise Intervention and Sedentary Behaviour Intervention
Could I receive a placebo?
No, everyone receives an active treatment
How many people
18 participants
Where
1 siteTurkey (Türkiye)
Study dates
1 Sep 2026to 15 Dec 2026
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 30 to 45 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Being physically inactive (not doing at least 150 minutes/week of structured exercise).
  • Being sedentary (having a daily sedentary time/day for >7 hours).
  • Having a BMI between 25 and 29.9 kg/m2.
  • Having a history of regular menstrual cycles for female participants.
  • Having medical examination approval.

Who cannot join

  • 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).

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Hikmet Sercan Toprakoğlu contact

+905369792652

sercantprkgl@gmail.com

Turkey (Türkiye)1 site, 1 recruiting
  • Hacettepe Sports Science Faculty, Hacettepe Beytepe Clinic

    Ankara, Beytepe

    Şükran Nazan Koşar, Professor, 0538 861 29 24, nazankosar@gmail.com

    Hikmet Sercan Toprakoğlu

    Recruiting

Other trials in Turkey (Türkiye)

About this study

Official title: Postprandial Cardiometabolic Effects of Interrupting Sedentary Behavior With Exercise of Varying Intensity in Healthy Overweight Adults

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.

Read the detailed description

Sedentary behavior (SED) refers to activities such as sitting, lying down, or reclining that require energy expenditure of ≤1.5 MET during the time spent awake. Prolonged and continuous sedentary behavior leads to adverse effects such as abnormal postprandial metabolic responses, insulin resistance, vascular dysfunction, high blood pressure, increased carbohydrate oxidation, and inflammation. Epidemiological data also show that SED increases the risk of mortality, cardiovascular disease, type 2 diabetes, and certain types of cancer. Experimental studies have shown that 2-5 minutes of low- or moderate-intensity aerobic exercise performed every 20-30 minutes during the postprandial period improves cardiometabolic health by reducing glucose, insulin, and blood pressure during the postprandial period. On the other hand, it is known that short-term sprint interval exercise (SIE) increases insulin sensitivity by rapidly depleting muscle glycogen, improves glucose control, lowers blood pressure, and increases fat oxidation. With these effects, SIE may be a time-efficient method for interrupting SED. Although the cardiometabolic benefits of SIE and aerobic exercise interruptions (AEI) are known, there is a lack of studies comparing the effects of interrupting SED with these two exercise types of different intensities in preventing postprandial cardiometabolic dysfunction. In this context, the aim of the study is to compare the postprandial cardiometabolic effects of interrupting sedentary behavior with AIE and sprint exercise interruptions (SEI) in overweight but otherwise healthy women and men aged 30-45. In this randomized crossover trial, volunteers will participate in three trials: 1) AEI, 2) SEI, and 3) SED. There will be a minimum 4-day washout period between trials. In the SEI and AEI trials, exercise interruptions will be implemented every 30 minutes during the 7-hour sitting period, whereas in the SED trial, participants will remain seated continuously for the entire duration. In all conditions, two meals (breakfast and lunch) will be served 3 hours apart, and the trials will begin, after the breakfast meal is consumed. Venous blood samples for every 30 minutes of the first two hours following meals to measure glucose and to be taken hourly during the rest experiment will be used to analyze insulin, glucose, and C-reactive protein (CRP) levels. In addition, blood pressure will be measured hourly, and fat oxidation will be assessed at the baseline, 2nd, 5th, and 7th hours. The effects of the conditions on glucose and insulin will be evaluated using linear mixed models. A Two-Way (Trial x Number of Repeats) Analysis of Variance for Repeated Measures will be used to detect differences between conditions.

Being tested
Aerobic Exercise Intervention, Sprint Exercise Intervention, Sedentary Behaviour Intervention
Keywords
Exercise, Sedentary behavior, Cardiometabolic health, Postprandial metabolism, overweight
Medical subject headings
Motor Activity, Sedentary Behavior, Overweight

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Aerobic Exercise InterventionOther

    In the aerobic exercise condition, participants will perform 2 minutes of moderate-intensity (%50 Wattmax) continuous cycling.

  • Sprint Exercise InterventionOther

    In the sprint condition, participants will complete a 10-second sprint at %200 Wattmax level, as determined during the preliminary test.

  • Sedentary Behaviour InterventionOther

    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.

Study groups in NCT07229963
Study groupRoleWhat they receive
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.
Receives: Other: Sedentary Behaviour Intervention
Breaking up sitting with aerobic exercise interruptionsExperimentalThe protocol that will interrupt sitting with AEI will involve cycle exercises performed at 50% of Wattmax for 2 minutes. The W and rpm levels corresponding to 50% of Wattmax will be determined using the values recorded during the determination of Wattmax.
Receives: Other: Aerobic Exercise Intervention
Breaking up sitting with sprint exercise interruptionsExperimentalThe protocol that will interrupt sitting with SEI will involve cycle exercises performed at the maximum revolutions per minute achievable within 10 seconds. Immediately (2-3 seconds) 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 %200 Wattmax level.
Receives: Other: Sprint Exercise Intervention

What is being measured

The primary outcome is the main question the study is designed to answer.

  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.

    Measured: 7 hour for each experimental condition

Secondary outcomes (4)
  1. Glucose

    Postprandial glucose. Net incremental area under the curve and total area under the curve for each 7 hour condition will be calculated for glucose.

    Measured: 7 hour for each experimental condition

  2. CRP

    Postprandial CRP. Net incremental area under the curve and total area under the curve for each 7 h condition will be calculated for CRP.

    Measured: 7 hour

  3. Substrate oxidation

    Postprandial substrate oxidation. During each experimental visit, for 7 hours, volunteers' respiratory data will be collected using a direct calorimeter with canopy hood in lying position for 10 minutes at 0, 2th, 5th, and 7th hours. The volunteers' resting fat and carbohydrate oxidations will be determined from the obtained data.

    Measured: 0, 2th, 5th, 7th hours

  4. Blood pressure

    Postprandial arterial blood pressure will be measured hourly for 7 h using an automatic blood pressure monitor with a cuff of appropriate size. The systolic and diastolic BP values measured will be recorded, and the mean arterial pressure will be calculated.

    Measured: 7 hour

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted17 Nov 2025
  2. Study start1 Sep 2026
  3. Primary completion20 Nov 2026 (estimated)
  4. Study completion15 Dec 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Prevention
Allocation
Randomised
Intervention model
Crossover
Masking
None (open label)
Enrolment
18 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07229963
Sponsor's protocol ID
SBA 25/679
Status last verified
Aug 2026
First submitted
24 Sep 2025
Last updated
24 Sep 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: 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.

Publications

  • Compher C, Frankenfield D, Keim N, Roth-Yousey L; Evidence Analysis Working Group. Best practice methods to apply to measurement of resting metabolic rate in adults: a systematic review. J Am Diet Assoc. 2006 Jun;106(6):881-903. doi: 10.1016/j.jada.2006.02.009.

    PubMed 16720129
  • Frayn KN. Calculation of substrate oxidation rates in vivo from gaseous exchange. J Appl Physiol Respir Environ Exerc Physiol. 1983 Aug;55(2):628-34. doi: 10.1152/jappl.1983.55.2.628.

    PubMed 6618956
  • DeMers D, Wachs D. Physiology, Mean Arterial Pressure. 2023 Apr 10. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from http://www.ncbi.nlm.nih.gov/books/NBK538226/

    PubMed 30855814
  • Stergiou GS, Palatini P, Parati G, O'Brien E, Januszewicz A, Lurbe E, Persu A, Mancia G, Kreutz R; European Society of Hypertension Council and the European Society of Hypertension Working Group on Blood Pressure Monitoring and Cardiovascular Variability. 2021 European Society of Hypertension practice guidelines for office and out-of-office blood pressure measurement. J Hypertens. 2021 Jul 1;39(7):1293-1302. doi: 10.1097/HJH.0000000000002843. No abstract available.

    PubMed 33710173
  • Mattes RD, Campbell WW. Effects of food form and timing of ingestion on appetite and energy intake in lean young adults and in young adults with obesity. J Am Diet Assoc. 2009 Mar;109(3):430-7. doi: 10.1016/j.jada.2008.11.031.

    PubMed 19248858
  • Augustin LSA, Kendall CWC, Jenkins DJA, Willett WC, Astrup A, Barclay AW, Bjorck I, Brand-Miller JC, Brighenti F, Buyken AE, Ceriello A, La Vecchia C, Livesey G, Liu S, Riccardi G, Rizkalla SW, Sievenpiper JL, Trichopoulou A, Wolever TMS, Baer-Sinnott S, Poli A. Glycemic index, glycemic load and glycemic response: An International Scientific Consensus Summit from the International Carbohydrate Quality Consortium (ICQC). Nutr Metab Cardiovasc Dis. 2015 Sep;25(9):795-815. doi: 10.1016/j.numecd.2015.05.005. Epub 2015 May 16.

    PubMed 26160327
  • Diet, nutrition and the prevention of chronic diseases. World Health Organ Tech Rep Ser. 2003;916:i-viii, 1-149, backcover.

    PubMed 12768890
  • Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990 Feb;51(2):241-7. doi: 10.1093/ajcn/51.2.241.

    PubMed 2305711
  • Carrillo-Arango HA, Atencio-Osorio MA, Lopez-Alban CA, Nava-Gonzalez EJ, Correa-Rodriguez M, Izquierdo M, Ramirez-Velez R. Metabolic responses to acute sprint interval exercise training performed after an oral 75-gram glucose load in individuals with overweight/obesity. Physiol Rep. 2023 Jan;11(2):e15555. doi: 10.14814/phy2.15555.

    PubMed 36695728
  • Ramirez-Velez R, Carrillo-Arango HA, Atencio-Osorio MA, Lopez-Alban CA, Calderon-Gonzalez JC, Morales-Alamo D, Izquierdo M, Correa-Rodriguez M. No sex differences in systemic metabolic responses to acute sprint interval training performed after an oral 75-g glucose load in adults with excess adiposity. Clin Nutr ESPEN. 2025 Feb;65:25-35. doi: 10.1016/j.clnesp.2024.11.005. Epub 2024 Nov 17.

    PubMed 39551347
  • Baker JS, Davies B. Brief high-intensity exercise and resistive force selection in overweight and obese subjects: body mass or body composition? Res Sports Med. 2006 Apr-Jun;14(2):97-106. doi: 10.1080/15438620600651298.

    PubMed 16869135
  • Borg GA. Psychophysical bases of perceived exertion. Med Sci Sports Exerc. 1982;14(5):377-81.

    PubMed 7154893
  • Midgley AW, McNaughton LR, Polman R, Marchant D. Criteria for determination of maximal oxygen uptake: a brief critique and recommendations for future research. Sports Med. 2007;37(12):1019-28. doi: 10.2165/00007256-200737120-00002.

    PubMed 18027991
  • Lanzi S, Codecasa F, Cornacchia M, Maestrini S, Salvadori A, Brunani A, Malatesta D. Fat oxidation, hormonal and plasma metabolite kinetics during a submaximal incremental test in lean and obese adults. PLoS One. 2014 Feb 11;9(2):e88707. doi: 10.1371/journal.pone.0088707. eCollection 2014.

    PubMed 24523934
  • Tudor-Locke C, Craig CL, Thyfault JP, Spence JC. A step-defined sedentary lifestyle index: <5000 steps/day. Appl Physiol Nutr Metab. 2013 Feb;38(2):100-14. doi: 10.1139/apnm-2012-0235. Epub 2012 Nov 8.

    PubMed 23438219

Questions about this trial

What is this clinical trial studying?

A study testing Aerobic Exercise Intervention, Sprint Exercise Intervention and Sedentary Behaviour Intervention in people with Cardiovascular Risk Markers and Postprandial Metabolism, run by Hacettepe University at 1 site in Turkey (Türkiye).

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 24 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Hikmet Sercan Toprakoğlu (+905369792652, sercantprkgl@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Insulin (time frame: 7 hour for each experimental condition). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07229963, which also lists 51 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Sep 2026.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in