Work Rate Adjustments During a High-intensity Interval Training on a Stationary Bike in a Hot and Temperate Environment
NCT ID: NCT05988606
Last Updated: 2023-08-14
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
7 participants
INTERVENTIONAL
2021-05-12
2021-11-14
Brief Summary
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The main questions it aims to answer are:
* Will HIIT based on target heart rate in a hot environment result in increased cardiovascular (i.e., elevated recovery HR) and thermal strain compared to HIIT in a temperate environment?
* Will work rate be lowered to a greater extent during HIIT in a hot environment compared to a temperate environment in order to maintain target heart rate?
* Will maximal aerobic capacity (V̇O2max) decrease to a greater extent after HIIT in the heat compared to a temperate environment?
Procedures:
Participants will complete 5 trials on a cycle ergometer. Trial 1 (Control Visit): Participants (n = 7) will have their maximal heart rate and V̇O2max measured in a temperate environment (\~22 °C, 40% RH).
Experimental Trials 2-5: The order of the trials will be counterbalanced and randomly assigned to participants.
* 15TEMP: Participants will cycle at 70% of their maximum heart rate for 8 minutes as a warm-up, followed by one round of HIIT. The HIIT protocol consists of 4 minutes at 90% of maximum heart rate followed by 3 minutes at 70% of maximum heart rate, totaling 15 minutes, in a temperate environment (\~22 °C, 40% RH). After the HIIT session, a graded exercise test will measure V̇O2max.
* 15HEAT: Similar to 15TEMP, but participants will perform the HIIT protocol in a hot environment (\~35 °C, 40% RH).
* 43TEMP: Participants will cycle at 70% of their maximum heart rate for 8 minutes as a warm-up, followed by the HIIT protocol repeated four times (4 minutes at 90% of maximum heart rate and 3 minutes at 70% of maximum heart rate), totaling 43 minutes, in a temperate environment (\~22 °C, 40% RH).
* 43HEAT: Similar to 43TEMP, but participants will perform the HIIT protocol in a hot environment (\~35 °C, 40% RH).
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Detailed Description
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Conditions
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Study Design
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RANDOMIZED
CROSSOVER
OTHER
NONE
Study Groups
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15TEMP
Participants cycled at 70% heart rate max for 8 min as a warm-up and then completed one round of HIIT, i.e., 4 min at 90% heart rate max followed by 3 min at 70% heart rate max for a total of 15 minutes in a temperate environment, followed by a graded exercise test to measure maximal aerobic capacity.
15 minutes of high-intensity interval training
Participants completed an 8 min warm-up and 1 round of high-intensity interval training
Temperate environment
Participants exercised in a temperate environment, \~ 22 °C, \~40% relative humidity.
15HEAT
Participants cycled at 70% heart rate max for 8 min as a warm-up and then completed one round of HIIT, i.e., 4 min at 90% heart rate max followed by 3 min at 70% heart rate max for a total of 15 minutes in a hot environment, followed by a graded exercise test to measure maximal aerobic capacity.
15 minutes of high-intensity interval training
Participants completed an 8 min warm-up and 1 round of high-intensity interval training
Hot environment
Participants exercised in a hot environment, \~ 35 °C, \~40% relative humidity.
43TEMP
Participants cycled at 70% heart rate max for 8 min as a warm-up and then performed the HIIT protocol (4 min at 90% heart rate max and 3 min at 70% heart rate max, repeated 4 times for a total of 43 minutes) in a temperate environment followed by a graded exercise test to measure maximal aerobic capacity.
43 minutes of high-intensity interval training
Participants completed an 8 min warm-up and 5 rounds of high-intensity interval training
Temperate environment
Participants exercised in a temperate environment, \~ 22 °C, \~40% relative humidity.
43HEAT
Participants cycled at 70% heart rate max for 8 min as a warm-up and then performed the HIIT protocol (4 min at 90% heart rate max and 3 min at 70% heart rate max, repeated 4 times for a total of 43 minutes) in a hot environment followed by a graded exercise test to measure maximal aerobic capacity.
43 minutes of high-intensity interval training
Participants completed an 8 min warm-up and 5 rounds of high-intensity interval training
Hot environment
Participants exercised in a hot environment, \~ 35 °C, \~40% relative humidity.
Control
Participants completed a graded exercise test on a stationary bicycle in a temperate environment (\~ 22 °C (72 °F), \~40% RH) to measure maximal aerobic capacity and maximal heart rate.
No interventions assigned to this group
Interventions
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15 minutes of high-intensity interval training
Participants completed an 8 min warm-up and 1 round of high-intensity interval training
43 minutes of high-intensity interval training
Participants completed an 8 min warm-up and 5 rounds of high-intensity interval training
Hot environment
Participants exercised in a hot environment, \~ 35 °C, \~40% relative humidity.
Temperate environment
Participants exercised in a temperate environment, \~ 22 °C, \~40% relative humidity.
Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
18 Years
39 Years
ALL
Yes
Sponsors
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University of Alabama, Tuscaloosa
OTHER
Responsible Party
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Locations
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The University of Alabama
Tuscaloosa, Alabama, United States
Countries
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Other Identifiers
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21-02-4359
Identifier Type: -
Identifier Source: org_study_id
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