Sprint Snacks: The Effects of Prolonged Rest on Reduced Exertion Interval Training.

Cardiorespiratory Fitness Clinical Trial

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).

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03159949
• Other study ID #: H17-00641
• Status: Completed
• Phase: N/A
• Start date: May 30, 2017
• Est. completion date: November 1, 2017

Study information

• Verified date: November 2018
• Source: University of British Columbia
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical 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. 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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 33
• Est. completion date: November 1, 2017
• Est. primary completion date: November 1, 2017
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 35 Years

Eligibility

Inclusion Criteria:

• Physically inactive (2 or less bouts of purposeful exercise per week)

Exclusion Criteria:

• 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.

• 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.

Related Conditions & MeSH terms

• Cardiorespiratory Fitness

Intervention

Other:
• REHIIT
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-REHIIT
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.

Locations

Country	Name	City	State
Canada	University of British Columbia	Kelowna	British Columbia

Sponsors (1)

Lead Sponsor	Collaborator
University of British Columbia

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	Exercise Enjoyment Scale	This outcome will measure the enjoyment from either PR-REHIIT or REHIIT exercise intervention	6 weeks
Other	Intention Questionnaire	This outcome will measure the likelihood of an individual incorporating either PR-REHIIT or REHIIT into their exercise routine.	6 weeks
Primary	Change in VO2max	Maximal oxygen uptake assessed using a ramp increase protocol on a cycle ergometer.	Before and after the 6 week intervention
Secondary	Change in 10 km Time Trial Performance	Time to complete a simulated 10 km Time Trial on a Cycle ergometer	Before and after the 6 week intervention