Effects of Short Duration High-intensity Interval Training on Peak Oxygen Consumption

Study Overview
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Brief Summary
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High-intensity interval training (HIIT) is an effective tool to improve cardiovascular fitness and maximal anaerobic power. Different methods of HIIT have been studied but the effect of a maximal effort cycling and very short exercise time (i.e., 4-s) with short recovery time (15-30 s) and a high number of repetitions (i.e., 30 bouts) is unknown.

Detailed Description
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The investigators examined the effects of training at maximal anaerobic power during cycling (PC) on maximal anaerobic power, peak oxygen consumption (VO2peak), and total blood volume in 11 young healthy individuals (age: 21.3±0.5 y) (6 men, 5 women). Methods: Participants trained three times a week for eight weeks performing a PC program consisting of 30 bouts of 4-s at an all-out intensity (i.e., 2 minutes of exercise per session). The cardiovascular stress progressively increased over the weeks by decreasing the recovery time between sprints (30 to 24 to 15-s) and thus session time decreased from 17 to < 10 min.

Official Title
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Effects of Short Duration High-intensity Interval Training on Peak Oxygen Consumption

Conditions
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Cardiovascular Fitness

Intervention / Treatment
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* Other: 4-s sprint inertial load training


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Young (18-30), Healthy, Recreationally active, but untrained (not meeting ACSM's recommendations of 150 min/week of moderate-vigorous aerobic exercise) - Exclusion Criteria: Cardiovascular disease Smoking Subjects who were exercising regularly (>75 min/week) were excluded. -

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 49 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 4-s sprint inertial load training<br>Participants trained three times a week for eight weeks following the training program consisting of 30 bouts of 4s all-out cycling on an inertial-load ergometer with progressively decreasing recovery time (30 to 24 to 15s). | Other: 4-s sprint inertial load training<br>* A program employing 30 bouts of 4s inertial load sprint training with progressively reduced recovery time (30 to 15 s) between sprints is effective for improving blood volume, VO2peak and maximal power.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cardiovascular changes | Maximal oxygen consumption (VO2max) is an indicator of health and fitness. The investigators measured VO2max with a graded exercise using electronically braked cycling ergometer. | Pre and post training (8 weeks) | 
| Blood volume changes | Hematological variables can effect the performance of the people. The investigators measured total blood volume, red blood cell volume, and plasma volume before and after training. | Pre and post training (8 weeks) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Performance changes | Study participants trained at maximal anaerobic power for 4-s. Therefore, the investigators measured maximal anaerobic power with different testing methods. | Pre and post training (8 weeks) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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exercise, cardiovascular fitness, sprinting, performance