Sedentary Behavior
Conditions
Keywords
Sprint Interval Training, VO2max, acute fatigue, chronic fatigue, force-velocity profile
Brief summary
The present study aims to analyse first, the acute effects generated by a single bout of Sprint Interval Training (SIT) and, secondly, the effects of a long-term intervention on sedentary participants.
Detailed description
The main goal is to determine the optimal dose of high-intensity exercise that enhances the best physiological adaptations. The cumulative effects of SIT, will be assessed by a series of measures placed throughout the time-course (before, after the 1st , the 2nd and the 3rd block of SIT). Those measures consist of physiological measurements (VO2max), neuromuscular capacities (force-velocity profile) the autonomic nervous system responses (heart rate variability) and blood markers (lactate, Creatine phosphoKinase (CK), cytokinases, µRNA). Acute effects will be measured in the familiarisation sessions (after short (8 sprints) and long (14 sprints) sets) by performing a battery of neuromuscular, perceptual, and autonomic nervous system tests before and after the single session of SIT.
Interventions
The Sprint Interval Training (SIT) training consists of 3 successive blocks of 5 training sessions each. The sessions are 24 to 48 hours apart. . One block lasts two weeks. After the end of one block, the following block begins the day after. The Sprint Interval Training lasts 6 weeks. Each session consists of a series of sprints, the number of which varies from 8 to 14. Thus a session will last from 30 to 45 min approximately So, the time frame of this study is Baseline, Block 1, Block 2 and Block 3 (Not in day or week or month)
Sponsors
Centre Hospitalier Universitaire de Saint Etienne
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Intervention model description
Sedentary participants
Eligibility
Sex/Gender
ALL
Age
18 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* untrained healthy (less than 2 hours of sport per week) * free from muscular, bone or joint injuries * free from neurologic disease
Exclusion criteria
* taking neuroactive substances that can alter corticospinal excitability * Heart or respiratory failure. * Subjects who have taken corticosteroids within 3 months (inhalation, infiltration or history of corticosteroid therapy). * Pregnant woman * Subject under guardianship
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| oxygen uptake (VO2max) - ml/min/kg | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | consumption oxygen uptake (VO2max) measured on a cycle ergometer The main objective is to determine at which time frame of sprint interval training blocks, the endurance performance (VO2max) is best. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Maximum theoretical force (N.m) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | It is measured thanks to the force-speed profile using two sprints of 7s with braking forces of 0 , 4 and 0.7 N.kg-1 respectively. |
| Maximum theoretical speed (m/s) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | It is measured thanks to the force-speed profile using two sprints of 7s with braking forces of 0 , 4 and 0.7 N.kg-1 respectively. |
| Maximum isometric force (N.m) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | It is measured by means of a voluntary maximum contraction test in which the maximum force generated voluntarily is compared to that voluntarily generated force will be compared to that evoked using electrical stimulation of the femoral nerve. |
| heart rate variability (HRV) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | — |
| Maximum power (W) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | It is measured thanks to the force-speed profile using two sprints of 7s with braking forces of 0 , 4 and 0.7 N.kg-1 respectively. |
| Cytokines (pg/ml) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | Blood sample |
| Creatine Kinase (UI/l) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | Blood sample |
| muscle microRNA | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | Blood sample |
| Lactate (mmol/l) | At the end of the 1st, 2nd and 3rd block : Each block = 2 weeks; each block is 1 day apart | Blood sample |
Countries
France
Outcome results
None listed