Low Volume Sprint Interval Training to Boost Fitness in Inactive Adults
Official title: The Effect of Low Volume Sprint Interval Training on Cardiorespiratory Fitness--a Randomized Controlled Trial
Run by California State University, San Marcos · NCT07328568 · Data updated 2026-11-12
A short, high-intensity interval program is tested to see if it improves cardiorespiratory fitness in inactive, healthy adults with BMI under 35.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years to 55 Years |
| Sex | All |
| Enrollment | 60 (estimated) |
| Sponsor | California State University, San Marcos Academic / other |
| Locations | 1 site (San Marcos, California) |
| Status | Recruiting |
| Started | November 5, 2025 |
| Main results expected | June 1, 2028 |
| Study ends | September 1, 2028 |
| Registry record updated | August 24, 2026 |
| Trial ID | NCT07328568 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Healthy adults under 56 years old with BMI less than 35 kg/m2 who are not currently weight-stable or highly active.
✕Probably not a fit
Individuals with BMI 35 kg/m2 or higher, active or weight-stable individuals, or those using medications that affect outcomes may not benefit.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This interventional study tests a low-volume sprint interval training (SIT) protocol to see if it can raise maximal oxygen uptake and improve body composition in adults who are inactive but otherwise healthy. Participants perform brief, intense exercise bouts separated by recovery periods, a time-efficient alternative to traditional training. The trial emphasizes safety and tolerability while measuring changes in cardiorespiratory fitness and related health markers. It builds on prior HIIT research showing fitness gains with shorter, intense workouts across diverse populations. The study is conducted at California State University, San Marcos, with a single location and a clearly defined healthy participant pool.
Why it matters
Potential benefit: If successful, participants may experience meaningful improvements in fitness with shorter exercise sessions.
How similar studies have gone: Previous HIIT studies have shown fitness gains in varied populations, suggesting potential benefits for similar low-volume protocols.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Healthy * BMI \< 35 kg/m2 * younger than 56 yr old * no joint issues Exclusion Criteria: * Those adults who are currently active and not weight stable * Adults with BMI \> 35 kg/m2 * Use of medications which may alter study outcomes
Where it's running
-
California State University--San Marcos Human Performance Laboratory
San Marcos, California, United States Recruiting
Study contacts
- Principal investigator: Todd A Astorino, Ph.D — California State University, San Marcos
- Study coordinator: Todd A Astorino, Ph.D
- Email: astorino@csusm.edu
- Phone: 760750-7351
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.