Interval Training in Young Healthy Individuals

Not Applicable

Completed

• Conditions: Healthy Subjects; Exercise Test
• Interventions: Behavioral: High frequency training; Behavioral: normal frequence training

• Registration Number: NCT00733941
• Lead Sponsor: Norwegian University of Science and Technology

Brief Summary

Individuals who participate in regular physical exercise possess a lower prevalence of cardiovascular risk factors such as hypertension, type 2 diabetes, obesity and hypercholesterolemia, and aerobic exercise is therefore considered an important adjuvant therapy in risk factor modification and to promote health.

The main focus of the present study is therefore to detect how rapid it is possible to increase aerobic capacity with interval running exercise.

The hypothesis is that it is possible to improve maximal oxygen uptake faster when increasing training frequency. The total gain in maximal oxygen uptake will however be the same between the two groups when they have performed the same amount of training

Detailed Description

We will perform aerobic interval training at an intensity of 90-95% of maximum heart rate in healthy individuals. The subjects will be randomly assigned to carry out a total of 24 exercise-sessions, either at 3 times per week or 8 times per week.

The two groups will carry out 24 training sessions before 8 weeks of detraining will provide how rapidly aerobic capacity is lost due to inactivity. After the detraining period a retraining phase is introduced to detect if improvements in aerobic capacity occur more rapidly compared to before the first training period

The subjects will be tested for oxygen uptake, pumping capacity of the heart, blood volume, skeletal muscle enzyme activity, endothelial function.

Study Timeline

• Study First Submitted: 2008-08-12
• Study First Submitted QC: 2008-08-12
• Study First Posted: 2008-08-13
• Study Start: 2008-09
• Primary Completion: 2009-06
• Study Completion: 2009-12
• Status Verified: 2015-05
• Last Update Submitted: 2015-05-26
• Last Update Posted: 2015-05-27

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 24

Inclusion Criteria

• BMI<27, non-smokers, train less that 1-2 times per week, VO2max <60 for male and <50 for female.

Exclusion Criteria

• Hypertension, diabetes and cardiovascular disease.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
High frequency training	High frequency training	24 interval exercises performed 8 times per week
Normal frequency training	normal frequence training	24 interval exercises performed 3 times per week

Primary Outcome Measures

Name	Time	Method
Oxygen uptake	Before and after the training-, detraining- and retraining-phase

Secondary Outcome Measures

Name	Time	Method
Cardiac function and skeletal muscle enzyme activity	After training, detraining and retraining

Trial Locations

Locations (2)

Norwegian University of Science and Technology; 🇳🇴 Trondheim, Norway

NTNU; 🇳🇴 Trondheim, Norway