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This study investigates the relation between ion-handling (K+) and fatigue development during exercise. Before and after a 6-week period of high intensity interval training, performance and ion-handling is assessed in young adults. In addition, mitochondrial function is examined.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| speed endurance training (SET) | Active Comparator | Training 6 weeks 3 times pr. week |
|
| Controls | No Intervention | Asked to continue their usual life style | |
| speed endurance training (SET) II | Active Comparator | Training 6 weeks 3 times pr. week |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Speed endurance training | Behavioral | Speed endurance training |
|
| Measure | Description | Time Frame |
|---|---|---|
| Quadriceps endurance | Time to exhaustion during knee-extensor exercise | Change from before (baseline) to after 6 weeks of training (Week 6) |
| Measure | Description | Time Frame |
|---|---|---|
| K+ release | Net leg K+ release in mmol/min during knee-extensor exercise | Change from before (baseline) to after 6 weeks of training (Week 6) |
| Measure | Description | Time Frame |
|---|---|---|
| Femoral venous plasma K+ | Femoral venous plasma K+ in mmol/L during knee-extensor exercise | Change from before (baseline) to after 6 weeks of training (Week 6) |
| Femoral venous lactate | Femoral venous lactate in mmol/L during knee-extensor exercise |
Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Copenhagen | Copenhagen | 2100 | Denmark |
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| Change from before (baseline) to after 6 weeks of training (Week 6) |
| Muscle Na+/K+-ATPase subunit content | Muscle Na+/K+-ATPase subunit content from vastus lateralis biopsies | Change from before (baseline) to after 6 weeks of training (Week 6) |
| Muscle mitochondrial respiration | Muscle mitochondrial respiration by high resolution respirometry (flux per mg muscle) from vastus lateralis biopsies | Change from before (baseline) to after 6 weeks of training (Week 6) |
| Muscle mitochondrial content | Muscle mitochondrial content of citrate synthase from vastus lateralis biopsies | Change from before (baseline) to after 6 weeks of training (Week 6) |