Cardiovascular FitnessNCT06906393
Adaptations to 4-s Sprint Interval Training at Different Intensities
A study testing Preventive treatment in people with Cardiovascular Fitness, run by University of Texas at Austin at 1 site in United States.
Trial summary
The purpose of this study is to investigate the chronic effects (i.e., 8 weeks, 3 times per week) of training at 50% and 75% of maximal power with 4-s sprint interval training on physiological adaptations. Read more about this study
- Who is it for?
- Ages 18 to 30 yearsHealthy volunteers can take part
- Conditions the study is for
- Cardiovascular Fitness
- What is being tested?
- Preventive treatment
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 24 participants
- Where
- 1 siteUnited States
- Study dates
- 30 Oct 2023to 2 Oct 2024
- Phase
- Interventional
- Are there results?
- None posted in the registry
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 18 to 30 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- Young (18-30),
- Healthy,
- Recreationally active, but untrained (not meeting ACSM's recommendations of 150 min/week of moderate-vigorous aerobic exercise)
Who cannot join
- Cardiovascular disease
- Smoking
- Subjects who were exercising regularly (>75 min/week) were excluded.
Trial locations and contacts
1 site in 1 country.
United States1 site
Human Performance Laboratory, Department of Kinesiology and Health Education, the University of Texas at Austin
Austin, Texas, 78712
About this study
Official title: The Physiological Adaptations to 4-s Sprint Interval Training at Different Intensities of Maximal Power
The purpose of this study is to investigate the chronic effects (i.e., 8 weeks, 3 times per week) of training at 50% and 75% of maximal power with 4-s sprint interval training on physiological adaptations. We previously examined the effect of training with an all-out intensity (i.e., 100% of maximal power) and reported increases in cardiorespiratory fitness. Now, we propose to examine the effects of a lower exercise intensity domains on cardiovascular fitness and its ability to stimulate the cardiorespiratory system. We hypothesize that training at 50% and 75% of maximal power will improve cardiorespiratory fitness similar to our previous findings while reducing the rate of perceived exertion during the exercise session. It is anticipated that the group engaged in training at 75% of maximal power will experience greater improvements in comparison to the group training at 50%.
Read the detailed description
Background Sprint interval training (SIT) is a well-established method for improving cardiovascular and anaerobic performance. While most research focuses on all-out efforts, less is known about the effects of submaximal sprint intensities on these adaptations. This study examined how training at 50%, 75%, and all-out (85%) of maximal anaerobic power (Pmax) influences aerobic capacity and anaerobic power over an 8-week training period.
Methods
Participants: 24 recreationally active adults (12 females, 12 males) were randomly assigned to one of three training groups:
50% Pmax
75% Pmax
All-out (85% Pmax)
Training Protocol: Participants completed three sessions per week for eight weeks. Each session consisted of thirty 4-second sprints on a cycling ergometer, totaling 10 minutes per session.
Measurements: Peak oxygen consumption (VO₂peak) and maximal anaerobic power (Pmax) were assessed before and after the training program.
- Conditions
- Cardiovascular Fitness
- Being tested
- Preventive treatment
- Keywords
- exercise, cardiovascular fitness, sprint, interval training
- Medical subject headings
- Motor Activity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Preventive treatmentBehavioural
4-second Sprint Interval Training (SIT) over 8 weeks to improve cardiovascular health.
| Study group | Role | What they receive |
|---|---|---|
| Training group 50% Pmax | Active comparator | Not described Receives: Behavioral: Preventive treatment |
| Training group 75% Pmax | Experimental | Not described Receives: Behavioral: Preventive treatment |
| Training group All-out Pmax | Experimental | Not described Receives: Behavioral: Preventive treatment |
What is being measured
The primary outcome is the main question the study is designed to answer.
Peak oxygen consumption
Measured: From enrollment to the end of treatment at 8 weeks
Secondary outcomes (1)
Maximal anaerobic power
Measured: From enrollment to the end of treatment at 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted2 Apr 2025
- Study start30 Oct 2023
- Primary completion2 Oct 2024
- Study completion2 Oct 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Cardiovascular FitnessStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
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
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 24 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Texas at Austin
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06906393
- Sponsor's protocol ID
- STUDY00004970
- Status last verified
- Mar 2025
- First submitted
- 24 Mar 2025
- Last updated
- 2 Apr 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 2 Apr 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The Physiological Adaptations to 4-s Sprint Interval Training at Different Intensities of Maximal Power
- ClinicalTrials.gov ID
- NCT06906393
- Acronym / sponsor ID
- STUDY00004970
- Conditions
- Cardiovascular Fitness
- Keywords
- exercise, cardiovascular fitness, sprint, interval training
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 24 participants (actual)
- Lead sponsor
- University of Texas at AustinUniversity, hospital or other
- Study start
- 30 Oct 2023 (actual)
- Primary completion
- 2 Oct 2024 (actual)
- Study completion
- 2 Oct 2024 (actual)
- First posted
- 2 Apr 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to investigate the chronic effects (i.e., 8 weeks, 3 times per week) of training at 50% and 75% of maximal power with 4-s sprint interval training on physiological adaptations. We previously examined the effect of training with an all-out intensity (i.e., 100% of maximal power) and reported increases in cardiorespiratory fitness. Now, we propose to examine the effects of a lower exercise intensity domains on cardiovascular fitness and its ability to stimulate the cardiorespiratory system. We hypothesize that training at 50% and 75% of maximal power will improve cardiorespiratory fitness similar to our previous findings while reducing the rate of perceived exertion during the exercise session. It is anticipated that the group engaged in training at 75% of maximal power will experience greater improvements in comparison to the group training at 50%.
Detailed description
Background Sprint interval training (SIT) is a well-established method for improving cardiovascular and anaerobic performance. While most research focuses on all-out efforts, less is known about the effects of submaximal sprint intensities on these adaptations. This study examined how training at 50%, 75%, and all-out (85%) of maximal anaerobic power (Pmax) influences aerobic capacity and anaerobic power over an 8-week training period.
Methods
Participants: 24 recreationally active adults (12 females, 12 males) were randomly assigned to one of three training groups:
50% Pmax
75% Pmax
All-out (85% Pmax)
Training Protocol: Participants completed three sessions per week for eight weeks. Each session consisted of thirty 4-second sprints on a cycling ergometer, totaling 10 minutes per session.
Measurements: Peak oxygen consumption (VO₂peak) and maximal anaerobic power (Pmax) were assessed before and after the training program.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Training group 50% Pmax | Active comparator | Behavioral: Preventive treatment |
| Training group 75% Pmax | Experimental | Behavioral: Preventive treatment |
| Training group All-out Pmax | Experimental | Behavioral: Preventive treatment |
Who may qualify
- Ages
- 18 to 30 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (3 listed)
- Young (18-30),
- Healthy,
- Recreationally active, but untrained (not meeting ACSM's recommendations of 150 min/week of moderate-vigorous aerobic exercise)
Key exclusion criteria (3 listed)
- Cardiovascular disease
- Smoking
- Subjects who were exercising regularly (>75 min/week) were excluded.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Preventive treatment4-second Sprint Interval Training (SIT) over 8 weeks to improve cardiovascular health. | Behavioural | Training group 50% Pmax, Training group 75% Pmax, Training group All-out Pmax |
Primary outcome
Peak oxygen consumption
Time frame: From enrollment to the end of treatment at 8 weeks
1 secondary outcome
Maximal anaerobic power
Time frame: From enrollment to the end of treatment at 8 weeks
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 2 Apr 2025.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Preventive treatment in people with Cardiovascular Fitness, run by University of Texas at Austin at 1 site in United States.
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 3 inclusion and 3 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: finished, as of the sponsor's last update on 2 Apr 2025. 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 United States. 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Peak oxygen consumption (time frame: From enrollment to the end of treatment at 8 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 2 Apr 2025.