Effect of Exercise With Low Intensity and Longer Duration Versus High Intensity Interval Training

Study Overview
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Brief Summary
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The purpose of the study is to compare exercise at 70% of maximal heart rate were total energy expenditure is twice compared to interval training at 90- 95% of maximal heart rate. Since 70% of maximal heart rate is well above the minimum threshold for improvements in maximal oxygen uptake it should be suited to investigate the effect of duration.

Official Title
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Does Endurance Exercise With Low Intensity and Longer Duration Improve Aerobic Capacity to the Same Extent as High Intensity Interval Training?

Conditions
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Healthy Subjects

Intervention / Treatment
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* Other: endurance exercise of different duration and intensity


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy non smoking men and woman, age 18-30 Exclusion Criteria: pathological findings measured by ekko/doppler, high cholesterol or high blood pressure

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 30 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: Prevention
Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: high intensity long interval<br>A group training four by four minutes interval at 90-95% of maximal heart rate dispersed by three minutes active pauses at 70% of maximal heart rate. | Other: endurance exercise of different duration and intensity<br>* Two interventions are compared with aerobic capacity as the main outcome. one group exercise at 70% of maximal heart rate for 90 minutes 3 times per week. group two exercise performe10 minutes warm up at 70% of maximal heart rate 4 x 4 minutes intervals at 90-95% of maximal heart rate with 3 minutes active pause at 70% of maximal heart rate in between, and finally 5 minutes cooling down at 70 % of maximal heart rate.<br>|
| Experimental: long duration at moderate training<br>a continuous training group exercising at 70% of maximal heart rate for 90 minutes. | Other: endurance exercise of different duration and intensity<br>* Two interventions are compared with aerobic capacity as the main outcome. one group exercise at 70% of maximal heart rate for 90 minutes 3 times per week. group two exercise performe10 minutes warm up at 70% of maximal heart rate 4 x 4 minutes intervals at 90-95% of maximal heart rate with 3 minutes active pause at 70% of maximal heart rate in between, and finally 5 minutes cooling down at 70 % of maximal heart rate.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| changes in maximal oxygen uptake |  | Maximal oxygen uptake will be measured at day 1 before training, then we will measure changes in maximal oxygen uptake after 8 weeks, and finally a follow up measurement of changes in maximal oxygen uptake after 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| endurance performance | work economy, lactate threshold will be measured toghether with maximal oxygen uptake to determine endurance performance. | one year | 
| health effects | coronary flow reserve, blood pressure, maximal oxygen uptake | one year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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aerobic capacity, maximal oxygen uptake, aerobic endurance, work economy, lactate threshold, endurance training, exercise intensity