Cardiorespiratory FitnessNCT03159949
Sprint Snacks: The Effects of Prolonged Rest on Reduced Exertion Interval Training.
A study testing REHIIT and PR-REHIIT in people with Cardiorespiratory Fitness, run by University of British Columbia at 1 site in Canada.
Trial summary
An adapted sprint interval training protocol involving 2-3 repeated 20-second sprints separated by 2-3 minutes rest (termed reduced exertion high- intensity interval training (REHIIT)) has been developed and has been shown to promote fitness benefits. Read more about this study
- Who is it for?
- Ages 18 to 35 yearsHealthy volunteers can take part
- Conditions the study is for
- Cardiorespiratory Fitness
- What is being tested?
- REHIIT and PR-REHIIT
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 33 participants
- Where
- 1 siteCanada
- Study dates
- 30 May 2017to 1 Nov 2017
- 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 35 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- Physically inactive (2 or less bouts of purposeful exercise per week)
Who cannot join
- If your doctor has informed you that you have a heart condition and should only do physical activity recommended by a doctor.
- If you feel pain in your chest when you perform any physical activity.
- If in the past the month you have had chest pain when you were not doing any physical activity.
- If you lose your balance or consciousness because of dizziness.
- If you have bone or joint problem (for example, back, knee, or hip) that could be made worse by a change in your physical activity.
- If you are currently pregnant or planning on becoming pregnant in the next 6 weeks.
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- You have previously had a heart attack or stroke
- You are currently engaging in high-intensity interval training.
- You are currently physically active (engaging in 3 or more bouts of purposeful exercise per week; a "bout" is defined as structured, planned exercise lasting at least 30 minutes)
- You have severe chest pain or blood pressure over 240/140 during baseline testing.
- You have exercise induced asthma or a history of syncope.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Exercise Sprint Snacks: The Effects of Prolonged Rest, Reduced Exertion High-intensity Interval Training (PR-REHIIT) Compared to Standard Reduced Exertion High-intensity Interval Training (REHIIT).
An adapted sprint interval training protocol involving 2-3 repeated 20-second sprints separated by 2-3 minutes rest (termed reduced exertion high- intensity interval training (REHIIT)) has been developed and has been shown to promote fitness benefits. This data shows how little exercise one may need to improve cardiorespiratory fitness, provided they are willing to work very hard. However, it is unknown whether the benefits of REHIIT are because of the "all-out" nature of the sprint efforts themselves or the pattern of completing sprints with relatively short (i.e., minutes) rest periods within a workout session.
We are inquiring whether performing the same number and style of sprints with prolonged rest (i.e., 1-4 hours of rest in between sprints) is equally effective for improving aerobic fitness when compared to more traditional sprint interval training with 2-3 minutes of rest between sprints. Such information may make the effectiveness of sprint training more accessible and approachable for individuals unwilling or unable to plan a purposeful REHIIT exercise session into their day. If the rest interval could be prolonged then it may be possible to perform a few sprints as "exercise snacks" throughout the day without the need for a structured interval training session.
- Conditions
- Cardiorespiratory Fitness
- Being tested
- REHIIT, PR-REHIIT
- Keywords
- VO2max, maximal oxygen uptake
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
REHIITOther
REHIIT participants will come into the lab one time per training days (3 training days per week), each session lasting 10 minutes. Training sessions involve a two-minute warm-up, 3 X 20-second cycling sprints on an exercise bike with three minutes rest in between, and a one-minute cool-down.
PR-REHIITOther
PR-REHIIT participants will come into the lab on 3 separate occasions on the training days, which occur 3 days per week (i.e., 9 sessions per week). Each session lasts 3 minutes and 20 seconds and consists of a two-minute warm-up, a 20-second "all-out" sprint on a cycle ergometer, and a one-minute cool-down. There will be 1-4 hours of rest in between training sessions where participants are free to leave the lab and go about their normal day.
| Study group | Role | What they receive |
|---|---|---|
| PR- REHIIT | Experimental | PR-REHIIT participants ("Sprint Snacks") will participate in 3 separate training session per day on 3 days per week (i.e., 9 sessions per week). Each session lasts 3 minutes and 20 seconds and consists of a two-minute warm-up, a 20-second "all-out" sprint, and a one-minute cool-down. There will be 1-4 hours of rest in between training sessions where participants are free to leave the lab and go about their normal day. Receives: Other: PR-REHIIT |
| REHIIT | Experimental | REHIIT participants will come into the lab one time per training days (3 training days per week), each session lasting 10 minutes. Training sessions involve a two-minute warm-up, 3 X 20-second sprints with three minutes rest in between, and a one-minute cool-down. Receives: Other: REHIIT |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in VO2max
Maximal oxygen uptake assessed using a ramp increase protocol on a cycle ergometer.
Measured: Before and after the 6 week intervention
Secondary outcomes (1)
Change in 10 km Time Trial Performance
Time to complete a simulated 10 km Time Trial on a Cycle ergometer
Measured: Before and after the 6 week intervention
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 May 2017
- Study start30 May 2017
- Primary completion1 Nov 2017
- Study completion1 Nov 2017
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Cardiorespiratory FitnessStudies of the same condition, open and under way.
- More trials run by University of British ColumbiaThe sponsor's other registered studies.
- 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
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 33 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of British Columbia
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Jonathan Little, University of British Columbia
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03159949
- Sponsor's protocol ID
- H17-00641
- Status last verified
- Nov 2018
- First submitted
- 17 May 2017
- Last updated
- 7 Nov 2018
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided: Individual data will be shown in all manuscript figures
Study at a glance
From the registry record, last updated by the sponsor on 7 Nov 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Exercise Sprint Snacks: The Effects of Prolonged Rest, Reduced Exertion High-intensity Interval Training (PR-REHIIT) Compared to Standard Reduced Exertion High-intensity Interval Training (REHIIT).
- ClinicalTrials.gov ID
- NCT03159949
- Acronym / sponsor ID
- H17-00641
- Conditions
- Cardiorespiratory Fitness
- Keywords
- VO2max, maximal oxygen uptake
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 33 participants (actual)
- Lead sponsor
- University of British ColumbiaUniversity, hospital or other
- Study start
- 30 May 2017 (actual)
- Primary completion
- 1 Nov 2017 (actual)
- Study completion
- 1 Nov 2017 (actual)
- First posted
- 19 May 2017 (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.
An adapted sprint interval training protocol involving 2-3 repeated 20-second sprints separated by 2-3 minutes rest (termed reduced exertion high- intensity interval training (REHIIT)) has been developed and has been shown to promote fitness benefits. This data shows how little exercise one may need to improve cardiorespiratory fitness, provided they are willing to work very hard. However, it is unknown whether the benefits of REHIIT are because of the "all-out" nature of the sprint efforts themselves or the pattern of completing sprints with relatively short (i.e., minutes) rest periods within a workout session.
We are inquiring whether performing the same number and style of sprints with prolonged rest (i.e., 1-4 hours of rest in between sprints) is equally effective for improving aerobic fitness when compared to more traditional sprint interval training with 2-3 minutes of rest between sprints. Such information may make the effectiveness of sprint training more accessible and approachable for individuals unwilling or unable to plan a purposeful REHIIT exercise session into their day. If the rest interval could be prolonged then it may be possible to perform a few sprints as "exercise snacks" throughout the day without the need for a structured interval training session.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| PR- REHIIT | Experimental | Other: PR-REHIITPR-REHIIT participants ("Sprint Snacks") will participate in 3 separate training session per day on 3 days per week (i.e., 9 sessions per week). Each session lasts 3 minutes and 20 seconds and consists of a two-minute warm-up, a 20-second "all-out" sprint, and a one-minute cool-down. There will be 1-4 hours of rest in between training sessions where participants are free to leave the lab and go about their normal day. |
| REHIIT | Experimental | Other: REHIITREHIIT participants will come into the lab one time per training days (3 training days per week), each session lasting 10 minutes. Training sessions involve a two-minute warm-up, 3 X 20-second sprints with three minutes rest in between, and a one-minute cool-down. |
Who may qualify
- Ages
- 18 to 35 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- Physically inactive (2 or less bouts of purposeful exercise per week)
Key exclusion criteria (11 listed)
- If your doctor has informed you that you have a heart condition and should only do physical activity recommended by a doctor.
- If you feel pain in your chest when you perform any physical activity.
- If in the past the month you have had chest pain when you were not doing any physical activity.
- If you lose your balance or consciousness because of dizziness.
- If you have bone or joint problem (for example, back, knee, or hip) that could be made worse by a change in your physical activity.
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 |
|---|---|---|
| REHIITREHIIT participants will come into the lab one time per training days (3 training days per week), each session lasting 10 minutes. Training sessions involve a two-minute warm-up, 3 X 20-second cycling sprints on an exercise bike with three minutes rest in between, and a one-minute cool-down. | Other | REHIIT |
| PR-REHIITPR-REHIIT participants will come into the lab on 3 separate occasions on the training days, which occur 3 days per week (i.e., 9 sessions per week). Each session lasts 3 minutes and 20 seconds and consists of a two-minute warm-up, a 20-second "all-out" sprint on a cycle ergometer, and a one-minute cool-down. There will be 1-4 hours of rest in between training sessions where participants are free to leave the lab and go about their normal day. | Other | PR- REHIIT |
Primary outcome
Change in VO2max
Time frame: Before and after the 6 week intervention
Maximal oxygen uptake assessed using a ramp increase protocol on a cycle ergometer.
1 secondary outcome
Change in 10 km Time Trial Performance
Time frame: Before and after the 6 week intervention
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 7 Nov 2018.
- Individual participant dataSharing planned: Undecided. Individual data will be shown in all manuscript figures
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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 REHIIT and PR-REHIIT in people with Cardiorespiratory Fitness, run by University of British Columbia at 1 site in Canada.
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 1 inclusion and 11 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 7 Nov 2018. 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 Canada. 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?
Change in VO2max (time frame: Before and after the 6 week intervention). 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 7 Nov 2018.