An interventional study of Exercise in Mitochondrial Function and Glucose Intolerance, sponsored by The Swedish School of Sport and Health Sciences. Completed at 1 site in Sweden. Open to participants aged 18 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-04-12.
Sponsored by The Swedish School of Sport and Health Sciences · Not applicable, Interventional, and Basic science
In this study 11 healthy volunteers will perform high intensity exercise training during 4 weeks. The exercise frequency will increase progressively during the first three weeks, followed by a fourth week with lower exercise frequency. 5 skeletal muscle biopsies will be donated throughout the study and 4 oral glucose tolerance tests will be performed after each training period.
11 healthy and recreational active subjects will be recruited to the study. For inclusion and assessment of baseline physiological characteristics during cycling, a pre-test will be performed on a cycle ergometer and the submaximal and maximal response to exercise will be determined by measurement of respiratory gas exchange. The physiological response to submaximal work rate will be comprised of a series of five minutes long intervals separated with one minutes of rest with assessment of capillary blood lactate and glucose at the end of each workload. All physiological tests and training (HII) sessions will be carefully supervised by trained personnel. The intervention period will include 14 HIIT-sessions in total, all performed at the laboratory under close surveillance and careful monitoring of power output and heart rate. During HIIT sessions, VO2, CO2, blood glucose, lactate and rating of perceived exhaustion (BORG) will be measured.
Energy intake will be standardized for each subject during the day of test sessions. After each HIIT-session a recovery drink containing 1 g · kg-1 bw of carbohydrates and 0.25 g · kg-1 bw of protein will be ingested by the subjects. After HIIT sessions, subjects will be supplied with an evening meal consisting of 74 g carbohydrates, 38 g protein and 26 g fat to be consumed two hours post exercise. Subjects will thereafter remain fasted until the next morning for an oral glucose tolerance test (OGTT) and donation of a muscle biopsy.
All biopsies will be collected in fasted state in early morning following 14 hour of rest after the last HIIT-session. Biopsies will be taken from vastus lateralis in alternating leg in randomized order.
Each subject will complete four OGTTs throughout the study. Resting metabolic rate (RMR) will be measured in supine position by gas exchange measurement using mixing chamber method (Oxycon Pro) attached to a ventilated hood. Thereafter the muscle biopsy will be taken and a catheter will be inserted into the antecubital vein of the forearm. After 10 minutes of passive rest 75 mg glucose dissolved in 300 ml water will be ingested and at 0, 15, 30, 45, 60 75, 90, 105- and 120-minutes after glucose intake a venous blood sample will be taken and instantly analyzed for glucose with enzymatic method in the Biosen C-Line Clinic. Additional RMR measurements will be performed at \~40 and 115 minutes after glucose ingestion.
Mitochondria will be isolated from fresh skeletal muscle biopsies. Mitochondrial respiration and H2O2 emission will be measured using a two-channel high-resolution respirometer with an attached fluorescent probe (Oxygraph-2k, Oroboros Instruments Corporation, Innsbruck, Austria).
778 studies on the registry are indexed under Glucose Intolerance; 129 are open to participants now.
This study's enrollment of 11 is below the median of 60 across 645 interventional studies indexed under Glucose Intolerance.
Browse Glucose Intolerance studies →The Swedish School of Sport and Health Sciences is the lead sponsor of 12 studies on the registry; 6 are open to participants now.
Counted across the registry records on this site, refreshed daily.
* Healthy
Exclusion Criteria:
Progressive exercise training
Other: Exercise
Progressively increasing training load
Change in mitochondrial respiration
Measurement of mitochondrial oxygen consumption in isolated mitochondria from Vastus Lateralis. Respiration will be assessed using substrate combinations targeting both complex I and II. Assessment will be performed in an Oroboros oxygraph
Time frame: At baseline (before exercise training), after 1 week of training, after 2 weeks of training, after 3 weeks of training, after 4 weeks of training
Change in glucose tolerance
Measurement of blood glucose response to 75g oral glucose
Time frame: At baseline (before exercise training), after 1 week of training, after 3 weeks of training, after 4 weeks of training
Change in oxidative stress
Measurement of carboylated proteins in skeletal muscle biopsies using a commercial ELISA kit
Time frame: At baseline (before exercise training), after 1 week of training, after 2 weeks of training, after 3 weeks of training, after 4 weeks of training
Plan to share: No
This study is completed, as verified in Apr 2023. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
The Swedish School of Sport and Health Sciences